About TCP/UDP Ports Port Number 0 to 1023: These TCP/UDP port numbers are known well-known ports. These port are assigned to specific server sevices by the Internet Assigned Numbers Authority (IANA). For example, port 80 is used by web servers. Port Numbers 1024 to 49151: These are ports that an organization, such as application developers, can register with IAMA to be used a particular service. These should be treated as semi-reserved. Port Numbers 49152 to 65535: These are port numbers used by client programs, such as a web browser. When you visit a web site, your web browser will assign that session a port number from with this range. As an application developer, you are free to use these Well-Known TCP/UDP Ports 0 to 1023 Port # Portocol Description Status 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 1 TCP, UDP TCPMUX 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 Protocol (data) - port for transferring FTP data Offical 21 TCP FTP Protocol (control) - port for FTP commands and flow control 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 communication, remote login service Offical 25 TCP, UDP SMTP (Simple Mail Transport Protocol) - used for email routing between email servers Offical 26 TCP, UDP RSFTP - A simple FTP-like protocol Unoffical 35 TCP, UDP QMS Magicolor 2 printer Unoffical 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/WINS Replications 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 (BootStrap Protocol) client; also used by DHCP (Dynamic Host Configuration Protocol) 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 Unoffical 82 UDP Torpark - Control Port Unoffical 88 TCP Kerberos - authenticating agent Offical 101 TCP HOSTNAME 102 TCP ISO-TSAP protocol/Microsoft Exchange 107 TCP Remote Telnet Service 109 TCP POP, Post Office Protocol, version 2 110 TCP POP3 (Post Office Protocol version 3) - used for retrieving emails 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 117 TCP UUCP-PATH 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 emails Offical 152 TCP, UDP BFTP, Background File Transfer Program 153 TCP, UDP SGMP, Simple Gateway Monitoring Protocol 156 TCP, UDP SQL Service Offical 157 TCP, UDP KNET VM Command Message Protocol 158 TCP, UDP DMSP, Distributed Mail Service Protocol 159 TCP, UDP NSS-Routing 160 TCP, UDP SGMP-TRAPS 161 TCP, UDP SNMP (Simple Network Management Protocol) Offical 162 TCP, UDP SNMPTRAP Offical 170 TCP Print-srv 179 TCP BGP (Border Gateway Protocol) - an exterior gateway routing protocol that enables groups of routers to share routing information to ensure efficient and loop-free routes can be established. BGP is commonly used within and between ISPs. Offical 190 TCP, UDP Gateway Access Control Protocol (GACP) 191 TCP, UDP Prospero Directory Service 192 TCP, UDP OSU Network Monitoring System, Apple AirPort Base Station PPP status or discovery, AirPort Admin Utility or Express Assistant 192 TCP. UDP SRMP (Spider Remote Monitoring Protocol) 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 AccessProtocol, 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 383 TCP, UDP HP OpenView HTTPs Operations Agent 366 TCP, UDP SMTP, Simple Mail Transfer Protocol. On-Demand Mail Relay (ODMR) 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 Unoffical 427 TCP, UDP SLP (Service Location Protocol) Offical 443 TCP HTTPS - HTTP Protocol over TLS/SSL (used for transferring web pages securely using encryption) 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 Conflict 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 561 TCP, UDP chcmd 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/Microsoft DCOM Offical 604 TCP TUNNEL 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 Unoffical 666 UDP Doom, First online FPS 674 TCP ACAP, Application Configuration Access Protocol 691 TCP Microsoft Exchange Routing Offical 692 TCP Hyperwave-ISP 695 TCP IEEE-MMS-SSL 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) 860 TCP iSCSI 873 TCP rsync - File synchronisation protocol Offical 901 TCP Samba Web Administration Tool (SWAT) Unoffical 902 VMware Server Unoffical 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 Unoffical 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.