TCP and UDP Ports

Network security: TCP/IP ports (K7SAK-NCS)
4-22-19


This is a list of TCP and UDP port numbers used by protocols of the application layer of the Internet protocol suite for the establishment of host-to-host connectivity.

The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic. The Stream Control Transmission Protocol (SCTP) and the Datagram Congestion Control Protocol (DCCP) also use port numbers. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses. However, many unofficial uses of both well-known and registered port numbers occur in practice. Similarly many of the official assignments refer to protocols that were never or are no longer in common use. This article lists port numbers and their associated protocols that have experienced significant uptake.


Well-known ports

Port TCP UDP IANA status[1] Description
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, and SCTP[11] Yes Official Discard Protocol[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, and SCTP[11] Assigned Official File Transfer Protocol (FTP) data transfer[10]
21 Yes, and SCTP[11] Assigned Official File Transfer Protocol (FTP) control (command)[10][11][21][22]
22 Yes, and SCTP[11] Assigned Official Secure Shell (SSH),[10] secure logins, file transfers (scp, sftp) and port forwarding
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, and SCTP[11] Assigned Official Hypertext Transfer Protocol (HTTP)[10][46][47][48]
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]
88 Yes Assigned Official Kerberos[10][50][51] authentication system
90 Yes Yes Unofficial PointCast (dotcom)[1][third-party source needed]
101 Yes Assigned Official NIC host name[52]
102 Yes Assigned Official ISO Transport Service Access Point (TSAP) Class 0 protocol;[53][54]
104 Yes Yes Official Digital Imaging and Communications in Medicine (DICOM; also port 11112)
105 Yes Yes Official CCSO Nameserver[55]
107 Yes Yes Official Remote User Telnet Service (RTelnet)[56]
108 Yes Yes Official IBM Systems Network Architecture (SNA) gateway access server
109 Yes Assigned Official Post Office Protocol, version 2 (POP2)[57]
110 Yes Assigned Official Post Office Protocol, version 3 (POP3)[10][58][59]
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][60] 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.[61]
115 Yes Assigned Official Simple File Transfer Protocol[10][62]
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[63][64]
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,[65] 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[66][67]
138 Assigned Yes Official NetBIOS Datagram Service[10][66][67]
139 Yes Assigned Official NetBIOS Session Service[66][67]
143 Yes Assigned Official Internet Message Access Protocol (IMAP),[10] management of electronic mail messages on a server[68]
152 Yes Yes Official Background File Transfer Program (BFTP)[69][importance?]
153 Yes Yes Official Simple Gateway Monitoring Protocol (SGMP), a protocol for remote inspection and alteration of gateway management information[70]
156 Yes Yes Official Structured Query Language (SQL) Service[jargon]
158 Yes Yes Official Distributed Mail System Protocol (DMSP, sometimes referred to as Pcmail)[71][importance?]
161 Assigned Yes Official Simple Network Management Protocol (SNMP)[72][citation needed][10]
162 Yes Yes Official Simple Network Management Protocol Trap (SNMPTRAP)[72][73][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[74]
179 Yes, and SCTP[11] Assigned Official Border Gateway Protocol (BGP),[75] used to exchange routing and reachability information among autonomous systems (AS) on the Internet
194 Yes Yes Official Internet Relay Chat (IRC)[76]
201 Yes Yes Official AppleTalk Routing Maintenance
209 Yes Assigned Official Quick Mail Transfer Protocol[77]
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[78]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)[79]
388 Yes Assigned Official Unidata LDM near real-time data distribution protocol[80][81]
389 Yes Assigned Official Lightweight Directory Access Protocol (LDAP)[10]
399 Yes Yes Official Digital Equipment Corporation DECnet (Phase V+) over TCP/IP
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, and SCTP[11] Assigned Official Hypertext Transfer Protocol over TLS/SSL (HTTPS)[10]
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,[82] 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)[83]
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[disambiguation needed]
513 Yes Official rlogin
Yes Official Who[84]
514 Yes Official 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[84]
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.[85]
587 Yes Assigned Official email message submission[10][86] (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,[87] 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[88]
648 Yes Official Registry Registrar Protocol (RRP)[89]
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)[90]
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)[91] 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)[92]
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),[93] a protocol that runs between a pair of nodes and is used to manage traffic engineering (TE) links
702 Yes Official IRIS[94][95] (Internet Registry Information Service) over BEEP (Blocks Extensible Exchange Protocol)[96] (RFC 3983)
706 Yes Official Secure Internet Live Conferencing (SILC)
711 Yes Official Cisco Tag Distribution Protocol[97][98][99]—being replaced by the MPLS Label Distribution Protocol[100]
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)[101]
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
808 Yes Unofficial Microsoft Net.TCP Port Sharing Service
829 Yes Assigned Official Certificate Management Protocol[102]
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[103]
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[104][105]
903 Yes Unofficial VMware ESXi[104][105]
953 Yes Reserved Official BIND remote name daemon control (RNDC)[106][107]
981 Yes Unofficial Remote HTTPS management for firewall devices running embedded Check Point VPN-1 software[108]
987 Yes Unofficial Microsoft Remote Web Workplace, a feature of Windows Small Business Server[109]
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)[110]
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.[76]
995 Yes Yes Official Post Office Protocol 3 over TLS/SSL (POP3S)[10]
1010 Yes Unofficial ThinLinc web-based administration interface[111]
1011–1020 Reserved Reserved Official
1023 Reserved Reserved Official [1]
Yes Yes Unofficial z/OS Network File System (NFS) (potentially ports 991–1023)[112]

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