0

Reserved

Reserved

Official

N/A

N/A

Unofficial

In programming APIs (not in communication between hosts), requests a system-allocated (dynamic) port[5]

1

Yes

Assigned

Official

TCP Port Service Multiplexer (TCPMUX). Historic. Both TCP and UDP have been assigned to TCPMUX by IANA,[1] but by design only TCP is specified.[6]

5

Assigned

Assigned

Official

Remote Job Entry[7] was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5[8] and IANA has assigned both TCP and UDP 5 to it.

7

Yes

Yes

Official

Echo Protocol[9][10]

9

Yes

Yes

Official

Discard Protocol[11]

Yes [12]

No

Yes

Unofficial

Wake-on-LAN[13]

11

Yes

Yes

Official

Active Users (systat service)[14][15]

13

Yes

Yes

Official

Daytime Protocol[16]

15

Yes

No

Unofficial

Previously netstat service[1][14]

17

Yes

Yes

Official

Quote of the Day (QOTD)[17]

18

Yes

Yes

Official

Message Send Protocol[18][19]

19

Yes

Yes

Official

Character Generator Protocol (CHARGEN)[20]

20

Yes

Assigned

Official

File Transfer Protocol (FTP) data transfer[10]

Yes [12]

21

Yes

Assigned

Official

File Transfer Protocol (FTP) control (command)[10][12][21][22]

Yes[12]

22

Yes

Assigned

Official

Secure Shell (SSH),[10] secure logins, file transfers (scp, sftp) and port forwarding

Yes [12]

23

Yes

Assigned

Official

Telnet protocol—unencrypted text communications[10][23]

25

Yes

Assigned

Official

Simple Mail Transfer Protocol (SMTP),[10][24] used for email routing between mail servers

37

Yes

Yes

Official

Time Protocol[25]

42

Assigned

Yes

Official

Host Name Server Protocol[26]

43

Yes

Assigned

Official

WHOIS protocol[27][28][29]

47

Reserved

Reserved

Official

49

Yes

Yes

Official

TACACS Login Host protocol.[30] TACACS+, still in draft which is an improved but distinct version of TACACS, only uses TCP 49.[31]

51

Reserved

Reserved

Official

Historically used for Interface Message Processor logical address management,[32] entry has been removed by IANA on 2013-05-25

52

Assigned

Assigned

Official

Xerox Network Systems (XNS) Time Protocol. Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[33]

53

Yes

Yes

Official

Domain Name System (DNS)[34][10]

54

Assigned

Assigned

Official

Xerox Network Systems (XNS) Clearinghouse (Name Server). Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[33]

56

Assigned

Assigned

Official

Xerox Network Systems (XNS) Authentication Protocol. Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[33]

58

Assigned

Assigned

Official

Xerox Network Systems (XNS) Mail. Despite this port being assigned by IANA, the service is meant to work on SPP (ancestor of IPX/SPX), instead of TCP/IP.[33]

61

Reserved

Reserved

Official

Historically assigned to the NIFTP-Based Mail protocol,[35] but was never documented in the related IEN.[36] The port number entry was removed from IANA's registry on 2017-05-18.[1]

67

Assigned

Yes

Official

Bootstrap Protocol (BOOTP) server;[10] also used by Dynamic Host Configuration Protocol (DHCP)

68

Assigned

Yes

Official

Bootstrap Protocol (BOOTP) client;[10] also used by Dynamic Host Configuration Protocol (DHCP)

69

Assigned

Yes

Official

Trivial File Transfer Protocol (TFTP)[10][37][38][39]

70

Yes

Assigned

Official

Gopher protocol[40]

71–74

Yes

Yes

Official

NETRJS protocol[41][42][43]

79

Yes

Assigned

Official

Finger protocol[10][44][45]

80

Yes

Assigned

Official

Hypertext Transfer Protocol (HTTP)[10][46][47][48]

Yes [12]

No

Yes

Unofficial

QUIC, a transport protocol over UDP (still in draft as of March 2019), using stream multiplexing, encryption by default with TLS, and currently supporting HTTP/2.[49] QUIC has been renamed to HTTP/3, which is currently an Internet Draft.

81

Yes

Unofficial

TorPark onion routing[verification needed]

82

Yes

Unofficial

TorPark control[verification needed]

83

Yes

Assigned

Official

MIT ML Device, networking file system [50]

88

Yes

Assigned

Official

Kerberos[10][51][52] authentication system

90

Yes

Yes

Unofficial

PointCast (dotcom)[1][third-party source needed]

95

Yes

Assigned

Official

SUPDUP, terminal-independent remote login [53]

101

Yes

Assigned

Official

NIC host name[54]

102

Yes

Assigned

Official

ISO Transport Service Access Point (TSAP) Class 0 protocol;[55][56]

104

Yes

Yes

Official

Digital Imaging and Communications in Medicine (DICOM; also port 11112)

105

Yes

Yes

Official

CCSO Nameserver[57]

107

Yes

Yes

Official

Remote User Telnet Service (RTelnet)[58]

108

Yes

Yes

Official

IBM Systems Network Architecture (SNA) gateway access server

109

Yes

Assigned

Official

Post Office Protocol, version 2 (POP2)[59]

110

Yes

Assigned

Official

Post Office Protocol, version 3 (POP3)[10][60][61]

111

Yes

Yes

Official

Open Network Computing Remote Procedure Call (ONC RPC, sometimes referred to as Sun RPC)

113

Yes

No

Official

Ident, authentication service/identification protocol,[10][62] used by IRC servers to identify users

Yes

Assigned

Official

Authentication Service (auth), the predecessor to identification protocol. Used to determine a user's identity of a particular TCP connection.[63]

115

Yes

Assigned

Official

Simple File Transfer Protocol[10][64]

117

Yes

Yes

Official

UUCP Mapping Project (path service)[citation needed]

118

Yes

Yes

Official

Structured Query Language (SQL) Services[jargon]

119

Yes

Assigned

Official

Network News Transfer Protocol (NNTP),[10] retrieval of newsgroup messages[65][66]

123

Assigned

Yes

Official

Network Time Protocol (NTP), used for time synchronization[10]

126

Yes

Yes

Official

Formerly Unisys Unitary Login, renamed by Unisys to NXEdit. Used by Unisys Programmer's Workbench for Clearpath MCP, an IDE for Unisys MCP software development

135

Yes

Yes

Official

DCE endpoint resolution

Yes

Yes

Official

Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service,[67] used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM

137

Yes

Yes

Official

NetBIOS Name Service, used for name registration and resolution[68][69]

138

Assigned

Yes

Official

NetBIOS Datagram Service[10][68][69]

139

Yes

Assigned

Official

NetBIOS Session Service[68][69]

143

Yes

Assigned

Official

Internet Message Access Protocol (IMAP),[10] management of electronic mail messages on a server[70]

152

Yes

Yes

Official

Background File Transfer Program (BFTP)[71][importance?]

153

Yes

Yes

Official

Simple Gateway Monitoring Protocol (SGMP), a protocol for remote inspection and alteration of gateway management information[72]

156

Yes

Yes

Official

Structured Query Language (SQL) Service[jargon]

158

Yes

Yes

Official

Distributed Mail System Protocol (DMSP, sometimes referred to as Pcmail)[73][importance?]

161

Assigned

Yes

Official

Simple Network Management Protocol (SNMP)[74][citation needed][10]

162

Yes

Yes

Official

Simple Network Management Protocol Trap (SNMPTRAP)[74][75][citation needed]

170

Yes

Yes

Official

Network PostScript print server

177

Yes

Yes

Official

X Display Manager Control Protocol (XDMCP), used for remote logins to an X Display Manager server[76][self-published source]

179

Yes

Assigned

Official

Border Gateway Protocol (BGP),[77] used to exchange routing and reachability information among autonomous systems (AS) on the Internet

Yes [12]

194

Yes

Yes

Official

Internet Relay Chat (IRC)[78]

199

Yes

Yes

Official

SNMP Unix Multiplexer (SMUX)[79]

201

Yes

Yes

Official

AppleTalk Routing Maintenance

209

Yes

Assigned

Official

Quick Mail Transfer Protocol[80][self-published source]

210

Yes

Yes

Official

ANSI Z39.50

213

Yes

Yes

Official

Internetwork Packet Exchange (IPX)

218

Yes

Yes

Official

Message posting protocol (MPP)

220

Yes

Yes

Official

Internet Message Access Protocol (IMAP), version 3

225–241

Reserved

Reserved

Official

249–255

Reserved

Reserved

Official

259

Yes

Yes

Official

Efficient Short Remote Operations (ESRO)

262

Yes

Yes

Official

Arcisdms

264

Yes

Yes

Official

Border Gateway Multicast Protocol (BGMP)

280

Yes

Yes

Official

http-mgmt

300

Yes

Unofficial

ThinLinc Web Access

308

Yes

Official

Novastor Online Backup

311

Yes

Assigned

Official

Mac OS X Server Admin[10] (officially AppleShare IP Web administration[1])

318

Yes

Yes

Official

PKIX Time Stamp Protocol (TSP)

319

Yes

Official

Precision Time Protocol (PTP) event messages

320

Yes

Official

Precision Time Protocol (PTP) general messages

350

Yes

Yes

Official

Mapping of Airline Traffic over Internet Protocol (MATIP) type A

351

Yes

Yes

Official

MATIP type B

356

Yes

Yes

Official

cloanto-net-1 (used by Cloanto Amiga Explorer and VMs)

366

Yes

Yes

Official

On-Demand Mail Relay (ODMR)

369

Yes

Yes

Official

Rpc2portmap

370

Yes

Yes

Official

codaauth2, Coda authentication server

Yes

Official

securecast1, outgoing packets to NAI's SecureCast servers[81]As of 2000

371

Yes

Yes

Official

ClearCase albd

383

Yes

Yes

Official

HP data alarm manager

384

Yes

Yes

Official

A Remote Network Server System

387

Yes

Yes

Official

AURP (AppleTalk Update-based Routing Protocol)[82]

388

Yes

Assigned

Official

Unidata LDM near real-time data distribution protocol[83][self-published source][84][self-published source]

389

Yes

Assigned

Official

Lightweight Directory Access Protocol (LDAP)[10]

399

Yes

Yes

Official

Digital Equipment Corporation DECnet+ (Phase V) over TCP/IP (RFC1859)

401

Yes

Yes

Official

Uninterruptible power supply (UPS)

427

Yes

Yes

Official

Service Location Protocol (SLP)[10]

433

Yes

Yes

Official

NNSP, part of Network News Transfer Protocol

434

Yes

Yes

Official

Mobile IP Agent (RFC 5944)

443

Yes

Assigned

Official

Hypertext Transfer Protocol over TLS/SSL (HTTPS)[10]

Yes [12]

No

Yes

Unofficial

Quick UDP Internet Connections (QUIC), a transport protocol over UDP (still in draft as of July 2018), using stream multiplexing, encryption by default with TLS, and currently supporting HTTP/2.[49]

444

Yes

Yes

Official

Simple Network Paging Protocol (SNPP), RFC 1568

445

Yes

Yes

Official

Microsoft-DS (Directory Services) Active Directory,[85] Windows shares

Yes

Assigned

Official

Microsoft-DS (Directory Services) SMB[10] file sharing

464

Yes

Yes

Official

Kerberos Change/Set password

465

Yes

No

Official

URL Rendezvous Directory for SSM (Cisco protocol)[importance?]

Yes

No

Official

Authenticated SMTP[10] over TLS/SSL (SMTPS)[86]

475

Yes

Yes

Official

tcpnethaspsrv, Aladdin Knowledge Systems Hasp services

491

Yes

Unofficial

GO-Global remote access and application publishing software

497

Yes

Yes

Official

Retrospect

500

Assigned

Yes

Official

Internet Security Association and Key Management Protocol (ISAKMP) / Internet Key Exchange (IKE)[10]

502

Yes

Yes

Official

Modbus Protocol

504

Yes

Yes

Official

Citadel, multiservice protocol for dedicated clients for the Citadel groupware system

510

Yes

Yes

Official

FirstClass Protocol (FCP), used by FirstClass client/server groupware system

512

Yes

Official

Rexec, Remote Process Execution

Yes

Official

comsat, together with biff

513

Yes

Official

rlogin

Yes

Official

Who[87]

514

Yes

Unofficial

Remote Shell, used to execute non-interactive commands on a remote system (Remote Shell, rsh, remsh)

No

Yes

Official

Syslog,[10] used for system logging

515

Yes

Assigned

Official

Line Printer Daemon (LPD),[10] print service

517

Yes

Official

Talk

518

Yes

Official

NTalk

520

Yes

Official

efs, extended file name server

Yes

Official

Routing Information Protocol (RIP)

521

Yes

Official

Routing Information Protocol Next Generation (RIPng)

524

Yes

Yes

Official

NetWare Core Protocol (NCP) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc.

525

Yes

Official

Timed, Timeserver

530

Yes

Yes

Official

Remote procedure call (RPC)

532

Yes

Assigned

Official

netnews[10]

533

Yes

Official

netwall, For Emergency Broadcasts

540

Yes

Official

Unix-to-Unix Copy Protocol (UUCP)

542

Yes

Yes

Official

commerce (Commerce Applications)

543

Yes

Official

klogin, Kerberos login

544

Yes

Official

kshell, Kerberos Remote shell

546

Yes

Yes

Official

DHCPv6 client

547

Yes

Yes

Official

DHCPv6 server

548

Yes

Assigned

Official

Apple Filing Protocol (AFP) over TCP[10]

550

Yes

Yes

Official

new-rwho, new-who[87]

554

Yes

Yes

Official

Real Time Streaming Protocol (RTSP)[10]

556

Yes

Official

Remotefs, RFS, rfs_server

560

Yes

Official

rmonitor, Remote Monitor

561

Yes

Official

monitor

563

Yes

Yes

Official

NNTP over TLS/SSL (NNTPS)

564

Yes

Unofficial

9P (Plan 9)

585

Port 993

?

Unofficial

Legacy use of Internet Message Access Protocol over TLS/SSL (IMAPS), now in use at port 993.[88]

587

Yes

Assigned

Official

email message submission[10][89] (SMTP)

591

Yes

Official

FileMaker 6.0 (and later) Web Sharing (HTTP Alternate, also see port 80)

593

Yes

Yes

Official

HTTP RPC Ep Map, Remote procedure call over Hypertext Transfer Protocol, often used by Distributed Component Object Model services and Microsoft Exchange Server

601

Yes

Official

Reliable Syslog Service — used for system logging

604

Yes

Official

TUNNEL profile,[90] a protocol for BEEP peers to form an application layer tunnel

623

Yes

Official

ASF Remote Management and Control Protocol (ASF-RMCP) & IPMI Remote Management Protocol

625

Yes

No

Unofficial

Open Directory Proxy (ODProxy)[10]

631

Yes

Yes

Official

Internet Printing Protocol (IPP)[10]

Yes

Yes

Unofficial

Common Unix Printing System (CUPS) administration console (extension to IPP)

635

Yes

Yes

Official

RLZ DBase

636

Yes

Assigned

Official

Lightweight Directory Access Protocol over TLS/SSL (LDAPS)[10]

639

Yes

Yes

Official

MSDP, Multicast Source Discovery Protocol

641

Yes

Yes

Official

SupportSoft Nexus Remote Command (control/listening), a proxy gateway connecting remote control traffic

643

Yes

Yes

Official

SANity

646

Yes

Yes

Official

Label Distribution Protocol (LDP), a routing protocol used in MPLS networks

647

Yes

Official

DHCP Failover protocol[91]

648

Yes

Official

Registry Registrar Protocol (RRP)[92]

651

Yes

Yes

Official

IEEE-MMS

653

Yes

Yes

Official

SupportSoft Nexus Remote Command (data), a proxy gateway connecting remote control traffic

654

Yes

Official

Media Management System (MMS) Media Management Protocol (MMP)[93]

655

Yes

Yes

Official

Tinc VPN daemon

657

Yes

Yes

Official

IBM RMC (Remote monitoring and Control) protocol, used by System p5 AIX Integrated Virtualization Manager (IVM)[94] and Hardware Management Console to connect managed logical partitions (LPAR) to enable dynamic partition reconfiguration

660

Yes

Assigned

Official

Mac OS X Server administration,[1] version 10.4 and earlier[10]

666

Yes

Yes

Official

Doom, first online first-person shooter

Yes

Unofficial

airserv-ng, aircrack-ng's server for remote-controlling wireless devices

674

Yes

Official

Application Configuration Access Protocol (ACAP)

688

Yes

Yes

Official

REALM-RUSD (ApplianceWare Server Appliance Management Protocol)

690

Yes

Yes

Official

Velneo Application Transfer Protocol (VATP)

691

Yes

Official

MS Exchange Routing

694

Yes

Yes

Official

Linux-HA high-availability heartbeat

695

Yes

Official

IEEE Media Management System over SSL (IEEE-MMS-SSL)[95]

698

Yes

Official

Optimized Link State Routing (OLSR)

700

Yes

Official

Extensible Provisioning Protocol (EPP), a protocol for communication between domain name registries and registrars (RFC 5734)

701

Yes

Official

Link Management Protocol (LMP),[96] a protocol that runs between a pair of nodes and is used to manage traffic engineering (TE) links

702

Yes

Official

IRIS[97][98] (Internet Registry Information Service) over BEEP (Blocks Extensible Exchange Protocol)[99] (RFC 3983)

706

Yes

Official

Secure Internet Live Conferencing (SILC)

711

Yes

Official

Cisco Tag Distribution Protocol[100][101][102]—being replaced by the MPLS Label Distribution Protocol[103]

712

Yes

Official

Topology Broadcast based on Reverse-Path Forwarding routing protocol (TBRPF; RFC 3684)

749

Yes

Yes

Official

Kerberos (protocol) administration[10]

750

Yes

Official

kerberos-iv, Kerberos version IV

751

Yes

Yes

Unofficial

kerberos_master, Kerberos authentication

752

Yes

Unofficial

passwd_server, Kerberos password (kpasswd) server

753

Yes

Yes

Official

Reverse Routing Header (RRH)[104]

Yes

Unofficial

userreg_server, Kerberos userreg server

754

Yes

Yes

Official

tell send

Yes

Unofficial

krb5_prop, Kerberos v5 slave propagation

760

Yes

Yes

Unofficial

krbupdate [kreg], Kerberos registration

782

Yes

Unofficial

Conserver serial-console management server

783

Yes

Unofficial

SpamAssassin spamd daemon

800

Yes

Yes

Official

mdbs-daemon

802

Yes

Yes

Official

MODBUS/TCP Security[105]

808

Yes

Unofficial

Microsoft Net.TCP Port Sharing Service

829

Yes

Assigned

Official

Certificate Management Protocol[106]

830

Yes

Yes

Official

NETCONF over SSH

831

Yes

Yes

Official

NETCONF over BEEP

832

Yes

Yes

Official

NETCONF for SOAP over HTTPS

833

Yes

Yes

Official

NETCONF for SOAP over BEEP

843

Yes

Unofficial

Adobe Flash[107]

847

Yes

Official

DHCP Failover protocol

848

Yes

Yes

Official

Group Domain Of Interpretation (GDOI) protocol

853

Yes

Yes

Official

DNS over TLS (RFC 7858)

860

Yes

Official

iSCSI (RFC 3720)

861

Yes

Yes

Official

OWAMP control (RFC 4656)

862

Yes

Yes

Official

TWAMP control (RFC 5357)

873

Yes

Official

rsync file synchronization protocol

888

Yes

Unofficial

cddbp, CD DataBase (CDDB) protocol (CDDBP)

Yes

Unofficial

IBM Endpoint Manager Remote Control

897

Yes

Yes

Unofficial

Brocade SMI-S RPC

898

Yes

Yes

Unofficial

Brocade SMI-S RPC SSL

902

Yes

Yes

Unofficial

VMware ESXi[108][109]

903

Yes

Unofficial

VMware ESXi[108][109]

953

Yes

Reserved

Official

BIND remote name daemon control (RNDC)[110][111]

981

Yes

Unofficial

Remote HTTPS management for firewall devices running embedded Check Point VPN-1 software[112]

987

Yes

Unofficial

Microsoft Remote Web Workplace, a feature of Windows Small Business Server[113]

989

Yes

Yes

Official

FTPS Protocol (data), FTP over TLS/SSL

990

Yes

Yes

Official

FTPS Protocol (control), FTP over TLS/SSL

991

Yes

Yes

Official

Netnews Administration System (NAS)[114]

992

Yes

Yes

Official

Telnet protocol over TLS/SSL

993

Yes

Assigned

Official

Internet Message Access Protocol over TLS/SSL (IMAPS)[10]

994

Reserved

Reserved

Official

Maybe

Maybe

Unofficial

Internet Relay Chat over TLS/SSL (IRCS). Previously assigned, but not used in common practice.

995

Yes

Yes

Official

Post Office Protocol 3 over TLS/SSL (POP3S)[10]

1010

Yes

Unofficial

ThinLinc web-based administration interface[115][self-published source?]

1011–1020

Reserved

Reserved

Official

1023

Reserved

Reserved

Official

[1]

Yes

Yes

Unofficial

z/OS Network File System (NFS) (potentially ports 991–1023)

[78]

[79]

[116][self-published source]

1024

Reserved

Reserved

Reserved

Official

1027

Reserved

Reserved

Official

Yes

Native IPv6 behind IPv4-to-IPv4 NAT Customer Premises Equipment (6a44)[117]

Official

1028

Deprecated

Official

1029

Microsoft DCOM services

Unofficial

1058

Yes

Yes

nim, IBM AIX Network Installation Manager (NIM)

Official

1059

Yes

Yes

nimreg, IBM AIX Network Installation Manager (NIM)

Official

1080

Yes

Yes

SOCKS proxy

Official

1085

Yes

Yes

WebObjects[10]

Official

1098

Yes

Yes

rmiactivation, Java remote method invocation (RMI) activation

Official

1099

Yes

Assigned

rmiregistry, Java remote method invocation (RMI) registry

Official

1109

Reserved – IANA

Official

Yes

Kerberos Post Office Protocol (KPOP)[citation needed]

Unofficial

1113

Assigned[note 1][118]

Yes[119]

Licklider Transmission Protocol (LTP) delay tolerant networking protocol

Official

1119

Yes

Yes

Battle.net chat/game protocol, used by Blizzard's games[120]

Official

1167

Yes, and SCTP

Yes

Cisco IP SLA (Service Assurance Agent)

Official

1194

Yes

Yes

OpenVPN

Official

1198

Yes

Yes

The cajo project Free dynamic transparent distributed computing in Java

Official

1214

Yes

Yes

Kazaa

Official

1218

Yes

No

William POWER

Official

1220

Yes

Assigned

QuickTime Streaming Server administration[10]

Official

1234

Yes

Yes

Infoseek search agent

Official

Yes

VLC media player default port for UDP/RTP stream

Unofficial

1241

Yes

Yes

Nessus Security Scanner

Official

1270

Yes

Yes

Microsoft System Center Operations Manager (SCOM) (formerly Microsoft Operations Manager (MOM)) agent

Official

1293

Yes

Yes

Internet Protocol Security (IPSec)

Official

1311

Yes

Yes

Windows RxMon.exe

Official

Yes

Dell OpenManage HTTPS[121]

Unofficial

1314

?

?

Festival Speech Synthesis System server[122][self-published source?]

Unofficial

1337

Yes

neo4j-shell[citation needed]

Unofficial

Yes

?

Sails.js default port[123]

Unofficial

Yes

WASTE Encrypted File Sharing Program[citation needed]

Unofficial

1341

Yes

Yes

Qubes (Manufacturing Execution System)

Official

1344

Yes

Yes

Internet Content Adaptation Protocol

Official

1352

Yes

Yes

IBM Lotus Notes/Domino (RPC) protocol

Official

1360

Yes

Yes

Mimer SQL

Official

1414

Yes

Yes

IBM WebSphere MQ (formerly known as MQSeries)

Official

1417

Yes

Yes

Timbuktu Service 1 Port

Official

1418

Yes

Yes

Timbuktu Service 2 Port

Official

1419

Yes

Yes

Timbuktu Service 3 Port

Official

1420

Yes

Yes

Timbuktu Service 4 Port

Official

1431

Yes

Reverse Gossip Transport Protocol (RGTP), used to access a General-purpose Reverse-Ordered Gossip Gathering System (GROGGS) bulletin board, such as that implemented on the Cambridge University's Phoenix system

Official

1433

Yes

Yes

Microsoft SQL Server database management system (MSSQL) server

Official

1434

Yes

Yes

Microsoft SQL Server database management system (MSSQL) monitor

Official

1492

Yes

Sid Meier's CivNet, a multiplayer remake of the original Sid Meier's Civilization game[citation needed]

Unofficial

1494

Yes

Yes

Citrix Independent Computing Architecture (ICA)[124]

Unofficial

1500

Yes

IBM Tivoli Storage Manager server[125]

Unofficial

1501

Yes

IBM Tivoli Storage Manager client scheduler[125]

Unofficial

1503

Yes

Yes

Windows Live Messenger (Whiteboard and Application Sharing)[126]

Unofficial

1512

Yes

Yes

Microsoft's Windows Internet Name Service (WINS)

Official

1513

Yes

Yes

Garena game client[citation needed]

Unofficial

1521

Yes

Yes

nCUBE License Manager

Official

Yes

Oracle database default listener, in future releases[when?][127] official port 2483 (TCP/IP) and 2484 (TCP/IP with SSL)

Unofficial

1524

Yes

Yes

ingreslock, ingres

Official

1527

Yes

Yes

Oracle Net Services, formerly known as SQL*Net[128]

Official

Yes

Apache Derby Network Server[129]

Unofficial

1533

Yes

Yes

IBM Sametime Virtual Places Chat

Official

1534

No

Yes

Eclipse Target Communication Framework [130]

Unofficial

1540

Yes

Yes

1C:Enterprise server agent (ragent)[131][132][self-published source]

Unofficial

1541

Yes

Yes

1C:Enterprise master cluster manager (rmngr)[131]

Unofficial

1542

Yes

Yes

1C:Enterprise configuration repository server[131]

Unofficial

1545

Yes

Yes

1C:Enterprise cluster administration server (RAS)[131]

Unofficial

1547

Yes

Yes

Laplink

Official

1550

Yes

Yes

1C:Enterprise debug server[131]

Unofficial

Yes

Gadu-Gadu (direct client-to-client)[citation needed]

Unofficial

1560–1590

Yes

Yes

1C:Enterprise cluster working processes[131]

Unofficial

1581

Yes

Yes

MIL STD 2045-47001 VMF

Official

Yes

IBM Tivoli Storage Manager web client[125]

Unofficial

1582–1583

Yes

IBM Tivoli Storage Manager server web interface[125]

Unofficial

1583

?

?

Pervasive PSQL[133]

Unofficial

1589

Yes

Yes

Cisco VLAN Query Protocol (VQP)

Official

1604

Yes

Yes

DarkComet remote administration tool (RAT)[citation needed]

Unofficial

1626

Yes

?

iSketch[134]

Unofficial

1627

Yes

?

iSketch[134]

Unofficial

1628

Yes

Yes

LonTalk normal

Official

1629

Yes

Yes

LonTalk urgent

Official

1645

Yes

Early deployment of RADIUS before RFC standardization was done using UDP port number 1645. Enabled for compatibility reasons by default on Cisco[citation needed] and Juniper Networks RADIUS servers.[135] Official port is 1812. TCP port 1645 MUST NOT be used.[136]

Unofficial

1646

Yes

Old radacct port,[when?] RADIUS accounting protocol. Enabled for compatibility reasons by default on Cisco[citation needed] and Juniper Networks RADIUS servers.[135] Official port is 1813. TCP port 1646 MUST NOT be used.[136]

Unofficial

1666

Yes

Perforce[137]

Unofficial

1677

Yes

Yes

Novell GroupWise clients in client/server access mode

Official

1688

Yes

Microsoft Key Management Service (KMS) for Windows Activation[138]

Unofficial

1701

Yes

Yes

Layer 2 Forwarding Protocol (L2F)

Official

Assigned

Yes

Layer 2 Tunneling Protocol (L2TP)[10]

Official

1707

Yes

Yes

Windward Studios games (vdmplay)

Official

Yes

L2TP/IPsec, for establish an initial connection[139]

Unofficial

1716

Yes

America's Army, a massively multiplayer online game (MMO)[140]

Unofficial

1719

Yes

Yes

H.323 registration and alternate communication

Official

1720

Yes

Yes

H.323 call signaling

Official

1723

Yes

Assigned

Point-to-Point Tunneling Protocol (PPTP)[10]

Official

1755

Yes

Yes

Microsoft Media Services (MMS, ms-streaming)

Official

1761

Yes

Yes

Novell ZENworks[141][142]

Unofficial

1783

Decomissioned [sic] Port 04/14/00, ms

Official

1801

Yes

Yes

Microsoft Message Queuing

Official

1812

Yes

Yes

RADIUS authentication protocol, radius

Official

1813

Yes

Yes

RADIUS accounting protocol, radius-acct

Official

1863

Yes

Yes

Microsoft Notification Protocol (MSNP), used by the Microsoft Messenger service and a number of instant messaging Messenger clients

Official

1880

?

?

Node-RED[143]

Unofficial

1883

Yes

Yes

MQTT (formerly MQ Telemetry Transport)

Official

1900

Assigned

Yes

Simple Service Discovery Protocol (SSDP),[10] discovery of UPnP devices

Official

1935

Yes

Yes

Macromedia Flash Communications Server MX, the precursor to Adobe Flash Media Server before Macromedia's acquisition by Adobe on December 3, 2005

Official

Yes

Yes

Real Time Messaging Protocol (RTMP)[citation needed], primarily used in Adobe Flash[144]

Unofficial

1967

Yes

Cisco IOS IP Service Level Agreements (IP SLAs) Control Protocol[citation needed]

Unofficial

1970

Yes

Yes

Netop Remote Control

Official

1972

Yes

Yes

InterSystems Caché

Official

1984

Yes

Yes

Big Brother

Official

1985

Assigned

Yes

Cisco Hot Standby Router Protocol (HSRP)[145][self-published source]

Official

1998

Yes

Yes

Cisco X.25 over TCP (XOT) service

Official

2000

Yes

Yes

Cisco Skinny Client Control Protocol (SCCP)

Official

2010

?

?

Artemis: Spaceship Bridge Simulator[146][self-published source?]

Unofficial

2033

Yes

Yes

Civilization IV multiplayer[147]

Unofficial

2049

Yes, and SCTP

Yes

Network File System (NFS)[10]

Official

2056

Yes

Yes

Civilization IV multiplayer[147]

Unofficial

2080

Yes

Yes

Autodesk NLM (FLEXlm)

Official

2082

Yes

cPanel default[148]

Unofficial

2083

Yes

Yes

Secure RADIUS Service (radsec)

Official

Yes

cPanel default SSL[148]

Unofficial

2086

Yes

Yes

GNUnet

Official

Yes

WebHost Manager default[148]

Unofficial

2087

Yes

WebHost Manager default SSL[148]

Unofficial

2095

Yes

cPanel default web mail[148]

Official

2096

Yes

cPanel default SSL web mail[148]

Unofficial

2100

Yes

Warzone 2100 multiplayer[citation needed]

Unofficial

2101

Yes

Networked Transport of RTCM via Internet Protocol (NTRIP)[citation needed]

Unofficial

2102

Yes

Yes

Zephyr Notification Service server

Official

2103

Yes

Yes

Zephyr Notification Service serv-hm connection

Official

2104

Yes

Yes

Zephyr Notification Service hostmanager

Official

2123

Yes

Yes

GTP control messages (GTP-C)

Official

2142

Yes

Yes

TDMoIP (TDM over IP)

Official

2152

Yes

Yes

GTP user data messages (GTP-U)

Official

2159

Yes

Yes

GDB remote debug port

Official

2181

Yes

Yes

EForward-document transport system

Official

Yes

Apache ZooKeeper default client port[citation needed]

Unofficial

2195

Yes

Apple Push Notification Service[10][149]

Unofficial

2196

Yes

Apple Push Notification Service, feedback service[10][149]

Unofficial

2210

Yes

Yes

NOAAPORT Broadcast Network

Official

2211

Yes

Yes

EMWIN

Official

2221

Yes

ESET anti-virus updates[150]

Unofficial

2222

Yes

Yes

EtherNet/IP implicit messaging for IO data

Official

?

?

DirectAdmin Access[151]

Unofficial

2222–2226

Yes

ESET Remote administrator[150]

Official

2240

Yes

Yes

General Dynamics Remote Encryptor Configuration Information Protocol (RECIPe)

Official

2261

Yes

Yes

CoMotion master

Official

2262

Yes

Yes

CoMotion backup

Official

2302