Home > Resources > Articles > TCP/IP Well Known Port Numbers (0 to 1023)

TCP/IP Well Known Port Numbers (0 to 1023)

Port #
0 TCP, UDP Reserved; do not use (but is a permissible source port value if the sending process does not expect messages in response) Offical
5 TCP, UDP RJE (Remote Job Entry) Offical
7 TCP, UDP ECHO protocol Offical
9 TCP, UDP DISCARD protocol Offical
11 TCP, UDP SYSTAT protocol Offical
13 TCP, UDP DAYTIME protocol Offical
17 TCP, UDP QOTD (Quote of the Day) protocol Offical
18 TCP, UDP Message Send Protocol Offical
19 TCP, UDP CHARGEN (Character Generator) protocol Offical
20 TCP FTP - data port (FTP-d) Offical
21 TCP FTP - control (command) port (FTP-c) Offical
22 TCP, UDP SSH (Secure Shell) - used for secure logins, file transfers (scp, sftp) and port forwarding Offical
23 TCP, UDP Telnet protocol - unencrypted text communications Offical
25 TCP, UDP SMTP (Simple Mail Transport Protocol) - used for e-mail routing between mailservers Offical
26 TCP, UDP RSFTP - A simple FTP-like protocol
35 TCP, UDP QMS Magicolor 2 printer
37 TCP, UDP TIME protocol Offical
38 TCP, UDP Route Access Protocol Offical
39 TCP, UDP Resource Location Protocol Offical
41 TCP, UDP Graphics Offical
42 TCP, UDP Host Name Server Offical
43 TCP WHOIS protocol Offical
49 TCP, UDP TACACS Login Host protocol Offical
53 TCP, UDP DNS (Domain Name System) Offical
57 TCP MTP, Mail Transfer Protocol Offical
67 UDP BOOTP (BootStrap Protocol) server; also used by DHCP (Dynamic Host Configuration Protocol) Offical
68 UDP BOOTP client; also used by DHCP Offical
69 UDP TFTP (Trivial File Transfer Protocol) Offical
70 TCP Gopher protocol Offical
79 TCP Finger protocol Offical
80 TCP HTTP (HyperText Transfer Protocol) - used for transferring web pages Offical
81 TCP Torpark - Onion routing ORport
82 UDP Torpark - Control Port
88 TCP Kerberos - authenticating agent Offical
102 TCP ISO-TSAP protocol
107 TCP Remote Telnet Service
109 TCP POP, Post Office Protocol, version 2
110 TCP POP3 (Post Office Protocol version 3) - used for retrieving E-mails Offical
111 TCP, UDP SUNRPC protocol
113 TCP ident - old server identification system, still used by IRC servers to identify its users Offical
115 TCP SFTP, Simple File Transfer Protocol
118 TCP, UDP SQL Services Offical
119 TCP NNTP (Network News Transfer Protocol) - used for retrieving newsgroups messages Offical
123 UDP NTP (Network Time Protocol) - used for time synchronization Offical
135 TCP, UDP EPMAP / Microsoft RPC Locator Service Offical
137 TCP, UDP NetBIOS NetBIOS Name Service Offical
138 TCP, UDP NetBIOS NetBIOS Datagram Service Offical
139 TCP, UDP NetBIOS NetBIOS Session Service Offical
143 TCP, UDP IMAP4 (Internet Message Access Protocol 4) - used for retrieving E-mails Offical
152 TCP, UDP BFTP, Background File Transfer Program
153 TCP, UDP SGMP, Simple Gateway Monitoring Protocol
156 TCP, UDP SQL Service Offical
158 TCP, UDP DMSP, Distributed Mail Service Protocol
161 TCP, UDP SNMP (Simple Network Management Protocol) Offical
170 TCP Print-srv
179 TCP BGP (Border Gateway Protocol) Offical
194 TCP IRC (Internet Relay Chat) Offical
201 TCP, UDP AppleTalk Routing Maintenance
209 TCP, UDP The Quick Mail Transfer Protocol
213 TCP, UDP IPX Offical
218 TCP, UDP MPP, Message Posting Protocol
220 TCP, UDP IMAP, Interactive Mail Access Protocol, version 3
259 TCP, UDP ESRO, Efficient Short Remote Operations
264 TCP, UDP BGMP, Border Gateway Multicast Protocol
311 TCP Apple Server-Admin-Tool, Workgroup-Manager-Tool
318 TCP, UDP TSP, Time Stamp Protocol
323 TCP, UDP IMMP, Internet Message Mapping Protocol


TCP, UDP HP OpenView HTTPs Operations Agent
366 TCP, UDP SMTP, Simple Mail Transfer Protocol. ODMR, On-Demand Mail Relay
369 TCP, UDP Rpc2portmap Offical
371 TCP, UDP ClearCase albd Offical
384 TCP, UDP A Remote Network Server System
387 TCP, UDP AURP, AppleTalk Update-based Routing Protocol
389 TCP, UDP LDAP (Lightweight Directory Access Protocol) Offical
401 TCP, UDP UPS Uninterruptible Power Supply Offical
411 TCP Direct Connect Hub port
427 TCP, UDP SLP (Service Location Protocol) Offical
443 TCP HTTPS - HTTP Protocol over TLS/SSL (encrypted transmission) Offical
444 TCP, UDP SNPP, Simple Network Paging Protocol
445 TCP Microsoft-DS (Active Directory, Windows shares, Sasser worm, Agobot, Zobotworm) Offical
445 UDP Microsoft-DS SMB file sharing Offical
464 TCP, UDP Kerberos Change/Set password Offical
465 TCP SMTP over SSL - CONFLICT with registered Cisco protocol
500 TCP, UDP ISAKMP, IKE-Internet Key Exchange Offical
512 TCP exec, Remote Process Execution
512 UDP comsat, together with biff: notifies users of new c.q. yet unread e-mail
513 TCP Login
513 UDP Who
514 TCP rsh protocol - used to execute non-interactive commandline commands on a remote system and see the screen return
514 UDP syslog protocol - used for system logging Offical
515 TCP Line Printer Daemon protocol - used in LPD printer servers
517 TCP Talk
518 UDP NTalk
520 TCP efs
520 UDP Routing - RIP Offical
513 UDP Router
524 TCP, UDP NCP (NetWare Core Protocol) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc. Offical
525 UDP Timed, Timeserver
530 TCP, UDP RPC Offical
531 TCP, UDP AOL Instant Messenger, IRC
532 TCP netnews
533 UDP netwall, For Emergency Broadcasts
540 TCP UUCP (Unix-to-Unix Copy Protocol)
542 TCP, UDP commerce (Commerce Applications)
543 TCP klogin, Kerberos login
544 TCP kshell, Kerberos Remote shell
546 TCP, UDP DHCPv6 client
547 TCP, UDP DHCPv6 server
548 TCP AFP (Apple Filing Protocol)
550 UDP new-rwho, new-who
554 TCP, UDP RTSP (Real Time Streaming Protocol) Offical
556 TCP Remotefs, rfs, rfs_server
560 UDP rmonitor, Remote Monitor
561 UDP monitor
563 TCP, UDP NNTP protocol over TLS/SSL (NNTPS) Offical
587 TCP email message submission (SMTP) (RFC 2476) Offical
591 TCP FileMaker 6.0 Web Sharing (HTTP Alternate, see port 80) Offical
593 TCP, UDP HTTP RPC Ep Map Offical
631 TCP, UDP IPP, Internet Printing Protocol
636 TCP, UDP LDAP over SSL (encrypted transmission) Offical
639 TCP, UDP MSDP, Multicast Source Discovery Protocol
646 TCP LDP, Label Distribution Protocol
647 TCP DHCP Failover Protocol
648 TCP RRP, Registry Registrar Protocol
652 TCP DTCP, Dynamic Tunnel Configuration Protocol
654 TCP AODV, Ad hoc On-Demand Distance Vector
665 TCP sun-dr, Remote Dynamic Reconfiguration
666 UDP Doom, First online FPS
674 TCP ACAP, Application Configuration Access Protocol
691 TCP MS Exchange Routing Offical
692 TCP Hyperwave-ISP
698 TCP OLSR, Optimized Link State Routing
699 TCP Access Network
700 TCP EPP, Extensible Provisioning Protocol
701 TCP LMP, Link Management Protocol.
702 TCP IRIS over BEEP
706 TCP SILC, Secure Internet Live Conferencing
711 TCP TDP, Tag Distribution Protocol
712 TCP TBRPF, Topology Broadcast based on Reverse-Path Forwarding
720 TCP SMQP, Simple Message Queue Protocol
749 TCP, UDP kerberos-adm, Kerberos administration
750 UDP Kerberos version IV
782 TCP Conserver serial-console management server
829 TCP CMP (Certificate Management Protocol)
873 TCP rsync File synchronisation protocol Offical
901 TCP Samba Web Administration Tool (SWAT)
902   VMware Server
911 TCP Network Console on Acid (NCA) - local tty redirection over OpenSSH
981 TCP SofaWare Technologies Remote HTTPS management for firewall devices running embedded Checkpoint Firewall-1 software
989 TCP, UDP FTP Protocol (data) over TLS/SSL Offical
990 TCP, UDP FTP Protocol (control) over TLS/SSL Offical
991 TCP, UDP NAS (Netnews Admin System)
992 TCP, UDP Telnet protocol over TLS/SSL Offical
993 TCP IMAP4 over SSL (encrypted transmission) Offical
995 TCP POP3 over SSL (encrypted transmission) Offical
  • Ports 0 to 1023 are Well-Known Ports.
  • Ports 1024 to 49151 are Registered Ports (often registered by a software developer to designate a particular port for their application)
  • Ports 49152 to 65535 are Public Ports.
Your IP address


This is your IP address. Click below to learn more about your location with GeoIP data.

More about your location