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PORT NUMBERS (last updated 2003-11-13) The port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports. The Well Known Ports are those from 0 through 1023. The Registered Ports are those from 1024 through 49151 The Dynamic and/or Private Ports are those from 49152 through 65535 ### UNASSIGNED PORT NUMBERS SHOULD NOT BE USED. THE IANA WILL ASSIGN THE NUMBER FOR THE PORT AFTER YOUR APPLICATION HAS BEEN APPROVED ### WELL KNOWN PORT NUMBERS The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by programs executed by privileged users. Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port". To the extent possible, these same port assignments are used with the UDP [RFC768]. The range for assigned ports managed by the IANA is 0-1023. Port Assignments: Keyword Decimal Description References ------- ------- ----------- ---------- 0/tcp Reserved 0/udp Reserved # Jon Postel <postel@isi.edu> tcpmux 1/tcp TCP Port Service Multiplexer tcpmux 1/udp TCP Port Service Multiplexer # Mark Lottor <MKL@nisc.sri.com> compressnet 2/tcp Management Utility compressnet 2/udp Management Utility compressnet 3/tcp Compression Process compressnet 3/udp Compression Process # Bernie Volz <VOLZ@PROCESS.COM> # 4/tcp Unassigned # 4/udp Unassigned rje 5/tcp Remote Job Entry rje 5/udp Remote Job Entry # Jon Postel <postel@isi.edu> # 6/tcp Unassigned # 6/udp Unassigned echo 7/tcp Echo echo 7/udp Echo # Jon Postel <postel@isi.edu> # 8/tcp Unassigned # 8/udp Unassigned discard 9/tcp Discard discard 9/udp Discard # Jon Postel <postel@isi.edu> # 10/tcp Unassigned # 10/udp Unassigned systat 11/tcp Active Users systat 11/udp Active Users # Jon Postel <postel@isi.edu> # 12/tcp Unassigned # 12/udp Unassigned daytime 13/tcp Daytime (RFC 867) daytime 13/udp Daytime (RFC 867) # Jon Postel <postel@isi.edu> # 14/tcp Unassigned # 14/udp Unassigned # 15/tcp Unassigned [was netstat] # 15/udp Unassigned # 16/tcp Unassigned # 16/udp Unassigned qotd 17/tcp Quote of the Day qotd 17/udp Quote of the Day # Jon Postel <postel@isi.edu> msp 18/tcp Message Send Protocol msp 18/udp Message Send Protocol # Rina Nethaniel <---none---> chargen 19/tcp Character Generator chargen 19/udp Character Generator ftp-data 20/tcp File Transfer [Default Data] ftp-data 20/udp File Transfer [Default Data] ftp 21/tcp File Transfer [Control] ftp 21/udp File Transfer [Control] # Jon Postel <postel@isi.edu> ssh 22/tcp SSH Remote Login Protocol ssh 22/udp SSH Remote Login Protocol # Tatu Ylonen <ylo@cs.hut.fi> telnet 23/tcp Telnet telnet 23/udp Telnet # Jon Postel <postel@isi.edu> 24/tcp any private mail system 24/udp any private mail system # Rick Adams <rick@UUNET.UU.NET> smtp 25/tcp Simple Mail Transfer smtp 25/udp Simple Mail Transfer # Jon Postel <postel@isi.edu> # 26/tcp Unassigned # 26/udp Unassigned nsw-fe 27/tcp NSW User System FE nsw-fe 27/udp NSW User System FE # Robert Thomas <BThomas@F.BBN.COM> # 28/tcp Unassigned # 28/udp Unassigned msg-icp 29/tcp MSG ICP msg-icp 29/udp MSG ICP # Robert Thomas <BThomas@F.BBN.COM> # 30/tcp Unassigned # 30/udp Unassigned msg-auth 31/tcp MSG Authentication msg-auth 31/udp MSG Authentication # Robert Thomas <BThomas@F.BBN.COM> # 32/tcp Unassigned # 32/udp Unassigned dsp 33/tcp Display Support Protocol dsp 33/udp Display Support Protocol # Ed Cain <cain@edn-unix.dca.mil> # 34/tcp Unassigned # 34/udp Unassigned 35/tcp any private printer server 35/udp any private printer server # Jon Postel <postel@isi.edu> # 36/tcp Unassigned # 36/udp Unassigned time 37/tcp Time time 37/udp Time # Jon Postel <postel@isi.edu> rap 38/tcp Route Access Protocol rap 38/udp Route Access Protocol # Robert Ullmann <ariel@world.std.com> rlp 39/tcp Resource Location Protocol rlp 39/udp Resource Location Protocol # Mike Accetta <MIKE.ACCETTA@CMU-CS-A.EDU> # 40/tcp Unassigned # 40/udp Unassigned graphics 41/tcp Graphics graphics 41/udp Graphics name 42/tcp Host Name Server name 42/udp Host Name Server nameserver 42/tcp Host Name Server nameserver 42/udp Host Name Server nicname 43/tcp Who Is nicname 43/udp Who Is mpm-flags 44/tcp MPM FLAGS Protocol mpm-flags 44/udp MPM FLAGS Protocol mpm 45/tcp Message Processing Module [recv] mpm 45/udp Message Processing Module [recv] mpm-snd 46/tcp MPM [default send] mpm-snd 46/udp MPM [default send] # Jon Postel <postel@isi.edu> ni-ftp 47/tcp NI FTP ni-ftp 47/udp NI FTP # Steve Kille <S.Kille@isode.com> auditd 48/tcp Digital Audit Daemon auditd 48/udp Digital Audit Daemon # Larry Scott <scott@zk3.dec.com> tacacs 49/tcp Login Host Protocol (TACACS) tacacs 49/udp Login Host Protocol (TACACS) # Pieter Ditmars <pditmars@BBN.COM> re-mail-ck 50/tcp Remote Mail Checking Protocol re-mail-ck 50/udp Remote Mail Checking Protocol # Steve Dorner <s-dorner@UIUC.EDU> la-maint 51/tcp IMP Logical Address Maintenance la-maint 51/udp IMP Logical Address Maintenance # Andy Malis <malis_a@timeplex.com> xns-time 52/tcp XNS Time Protocol xns-time 52/udp XNS Time Protocol # Susie Armstrong <Armstrong.wbst128@XEROX> domain