Port

port

- a place (seaport or airport) where people and merchandise can enter or leave a country

- sweet dark-red dessert wine originally from Portugal

- an opening (in a wall or ship or armored vehicle) for firing through

- interface: (computer science) computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals)

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.

To the extent possible, these same port assignments are used with the UDP (RFC 768).

ports 17-110 (most widely known, complete list below)

qotd            17/tcp    Quote of the Day qotd            17/udp    Quote of the Day msp             18/tcp    Message Send Protocol msp             18/udp    Message Send Protocol chargen         19/tcp    Character Generator chargen         19/udp    Character Generator ftp-data        20/tcp    File Transfer [Default Data] <-FTP ftp-data        20/udp    File Transfer [Default Data] <-FTP ftp             21/tcp    File Transfer [Control] <-FTP ftp             21/udp    File Transfer [Control] <-FTP ssh             22/tcp    SSH Remote Login Protocol <-SSH ssh             22/udp    SSH Remote Login Protocol <-SSH telnet          23/tcp    Telnet <-Telnet telnet          23/udp    Telnet <-Telnet 24/tcp   any private mail system 24/udp   any private mail system smtp            25/tcp    Simple Mail Transfer <-SMTP smtp            25/udp    Simple Mail Transfer <-SMTP nsw-fe          27/tcp    NSW User System FE nsw-fe           27/udp    NSW User System FE msg-icp          29/tcp    MSG ICP msg-icp         29/udp    MSG ICP msg-auth        31/tcp    MSG Authentication msg-auth        31/udp    MSG Authentication dsp             33/tcp    Display Support Protocol dsp             33/udp    Display Support Protocol 35/tcp   any private printer server 35/udp   any private printer server time            37/tcp    Time time            37/udp    Time rap             38/tcp    Route Access Protocol rap             38/udp    Route Access Protocol rlp             39/tcp    Resource Location Protocol rlp             39/udp    Resource Location Protocol 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] ni-ftp          47/tcp    NI FTP ni-ftp          47/udp    NI FTP auditd          48/tcp    Digital Audit Daemon auditd          48/udp    Digital Audit Daemon tacacs          49/tcp    Login Host Protocol (TACACS) tacacs          49/udp    Login Host Protocol (TACACS) re-mail-ck      50/tcp    Remote Mail Checking Protocol re-mail-ck      50/udp    Remote Mail Checking Protocol la-maint        51/tcp    IMP Logical Address Maintenance la-maint        51/udp    IMP Logical Address Maintenance xns-time        52/tcp    XNS Time Protocol xns-time        52/udp    XNS Time Protocol domain          53/tcp    Domain Name Server domain          53/udp    Domain Name Server xns-ch          54/tcp    XNS Clearinghouse xns-ch          54/udp    XNS Clearinghouse isi-gl          55/tcp    ISI Graphics Language isi-gl          55/udp    ISI Graphics Language xns-auth        56/tcp    XNS Authentication xns-auth        56/udp    XNS Authentication 57/tcp   any private terminal access 57/udp   any private terminal access xns-mail        58/tcp    XNS Mail xns-mail        58/udp    XNS Mail 59/tcp   any private file service 59/udp   any private file service 60/tcp   Unassigned 60/udp   Unassigned ni-mail         61/tcp    NI MAIL ni-mail         61/udp    NI MAIL acas            62/tcp    ACA Services acas            62/udp    ACA Services whois++         63/tcp    whois++ whois++         63/udp    whois++ covia           64/tcp    Communications Integrator (CI) covia           64/udp    Communications Integrator (CI) tacacs-ds       65/tcp    TACACS-Database Service tacacs-ds       65/udp    TACACS-Database Service sql*net         66/tcp    Oracle SQL*NET sql*net         66/udp    Oracle SQL*NET bootps          67/tcp    Bootstrap Protocol Server bootps          67/udp    Bootstrap Protocol Server bootpc          68/tcp    Bootstrap Protocol Client bootpc          68/udp    Bootstrap Protocol Client tftp            69/tcp    Trivial File Transfer tftp            69/udp    Trivial File Transfer gopher          70/tcp    Gopher gopher          70/udp    Gopher netrjs-1        71/tcp    Remote Job Service netrjs-1        71/udp    Remote Job Service netrjs-2        72/tcp    Remote Job Service netrjs-2        72/udp    Remote Job Service netrjs-3        73/tcp    Remote Job Service netrjs-3        73/udp    Remote Job Service netrjs-4        74/tcp    Remote Job Service netrjs-4        74/udp    Remote Job Service 75/tcp   any private dial out service 75/udp   any private dial out service deos            76/tcp    Distributed External Object Store deos            76/udp    Distributed External Object Store 77/tcp   any private RJE service 77/udp   any private RJE service vettcp          78/tcp    vettcp vettcp          78/udp    vettcp finger          79/tcp    Finger finger          79/udp    Finger http            80/tcp    World Wide Web HTTP <-WWW http            80/udp    World Wide Web HTTP <-WWW www             80/tcp    World Wide Web HTTP <-WWW www             80/udp    World Wide Web HTTP <-WWW www-http        80/tcp    World Wide Web HTTP <-WWW www-http        80/udp    World Wide Web HTTP <-WWW hosts2-ns       81/tcp    HOSTS2 Name Server hosts2-ns       81/udp    HOSTS2 Name Server xfer            82/tcp    XFER Utility xfer            82/udp    XFER Utility mit-ml-dev      83/tcp    MIT ML Device mit-ml-dev      83/udp    MIT ML Device ctf             84/tcp    Common Trace Facility ctf             84/udp    Common Trace Facility mit-ml-dev      85/tcp    MIT ML Device mit-ml-dev      85/udp    MIT ML Device mfcobol         86/tcp    Micro Focus Cobol mfcobol         86/udp    Micro Focus Cobol 87/tcp   any private terminal link 87/udp   any private terminal link kerberos        88/tcp    Kerberos kerberos        88/udp    Kerberos su-mit-tg       89/tcp    SU/MIT Telnet Gateway su-mit-tg       89/udp    SU/MIT Telnet Gateway dnsix           90/tcp    DNSIX Securit Attribute Token Map dnsix           90/udp    DNSIX Securit Attribute Token Map mit-dov         91/tcp    MIT Dover Spooler mit-dov         91/udp    MIT Dover Spooler npp             92/tcp    Network Printing Protocol npp             92/udp    Network Printing Protocol dcp             93/tcp    Device Control Protocol dcp             93/udp    Device Control Protocol objcall         94/tcp    Tivoli Object Dispatcher objcall         94/udp    Tivoli Object Dispatcher supdup          95/tcp    SUPDUP supdup          95/udp    SUPDUP dixie           96/tcp    DIXIE Protocol Specification dixie           96/udp    DIXIE Protocol Specification swift-rvf       97/tcp    Swift Remote Virtural File Protocol swift-rvf       97/udp    Swift Remote Virtural File Protocol tacnews         98/tcp    TAC News tacnews         98/udp    TAC News metagram        99/tcp    Metagram Relay metagram        99/udp    Metagram Relay newacct        100/tcp    [unauthorized use] hostname       101/tcp    NIC Host Name Server hostname       101/udp    NIC Host Name Server iso-tsap       102/tcp    ISO-TSAP Class 0 iso-tsap       102/udp    ISO-TSAP Class 0 gppitnp        103/tcp    Genesis Point-to-Point Trans Net gppitnp        103/udp    Genesis Point-to-Point Trans Net acr-nema       104/tcp    ACR-NEMA Digital Imag. & Comm. 300 acr-nema       104/udp    ACR-NEMA Digital Imag. & Comm. 300 cso            105/tcp    CCSO name server protocol cso            105/udp    CCSO name server protocol csnet-ns       105/tcp    Mailbox Name Nameserver csnet-ns       105/udp    Mailbox Name Nameserver 3com-tsmux     106/tcp    3COM-TSMUX 3com-tsmux     106/udp    3COM-TSMUX rtelnet        107/tcp    Remote Telnet Service rtelnet        107/udp    Remote Telnet Service snagas         108/tcp    SNA Gateway Access Server snagas         108/udp    SNA Gateway Access Server pop2           109/tcp    Post Office Protocol - Version 2 pop2           109/udp    Post Office Protocol - Version 2 pop3           110/tcp    Post Office Protocol - Version 3 <-POP3 pop3           110/udp    Post Office Protocol - Version 3 <-POP3
 * 1)                          Jon Postel 
 * 1)                          Rina Nethaniel <---none--->
 * 1)                          Jon Postel 
 * 1)                          Tatu Ylonen 
 * 1)                          Jon Postel 
 * 1)                          Rick Adams 
 * 1)                          Jon Postel 
 * 2)                26/tcp    Unassigned
 * 3)                26/udp    Unassigned
 * 1)                          Robert Thomas 
 * 2)                28/tcp    Unassigned
 * 3)                28/udp    Unassigned
 * 1)                          Robert Thomas 
 * 2)                30/tcp    Unassigned
 * 3)                30/udp    Unassigned
 * 1)                          Robert Thomas 
 * 2)                32/tcp    Unassigned
 * 3)                32/udp    Unassigned
 * 1)                          Ed Cain 
 * 2)                34/tcp    Unassigned
 * 3)                34/udp    Unassigned
 * 1)                          Jon Postel 
 * 2)                36/tcp    Unassigned
 * 3)                36/udp    Unassigned
 * 1)                          Jon Postel 
 * 1)                          Robert Ullmann 
 * 1)                          Mike Accetta 
 * 2)                40/tcp    Unassigned
 * 3)                40/udp    Unassigned
 * 1)                          Jon Postel 
 * 1)                          Steve Kille 
 * 1)                          Larry Scott <scott@zk3.dec.com>
 * 1)                          Pieter Ditmars <pditmars@BBN.COM>
 * 1)                          Steve Dorner <s-dorner@UIUC.EDU>
 * 1)                          Andy Malis <malis_a@timeplex.com>
 * 1)                          Susie Armstrong <Armstrong.wbst128@XEROX>
 * 1)                          Paul Mockapetris <PVM@ISI.EDU>
 * 1)                          Susie Armstrong <Armstrong.wbst128@XEROX>
 * 1)                          Susie Armstrong <Armstrong.wbst128@XEROX>
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Susie Armstrong <Armstrong.wbst128@XEROX>
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Steve Kille <S.Kille@isode.com>
 * 1)                          E. Wald <ewald@via.enet.dec.com>
 * 1)                          Rickard Schoultz <schoultz@sunet.se>
 * 1)                          Dan Smith <dan.smith@den.galileo.com>
 * 1)                          Kathy Huber <khuber@bbn.com>
 * 1)                          Jack Haverty <jhaverty@ORACLE.COM>
 * 1)                          Bill Croft <Croft@SUMEX-AIM.STANFORD.EDU>
 * 1)                          David Clark <ddc@LCS.MIT.EDU>
 * 1)                          Mark McCahill <mpm@boombox.micro.umn.edu>
 * 1)                          Bob Braden <Braden@ISI.EDU>
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Robert Ullmann <ariel@world.std.com>
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Christopher Leong <leong@kolmod.mlo.dec.com>
 * 1)                          David Zimmerman <dpz@RUTGERS.EDU>
 * 1)                          Tim Berners-Lee <timbl@W3.org>
 * 1)                          Earl Killian <EAK@MORDOR.S1.GOV>
 * 1)                          Thomas M. Smith <Thomas.M.Smith@lmco.com>
 * 1)                          David Reed <--none--->
 * 1)                          Hugh Thomas <thomas@oils.enet.dec.com>
 * 1)                          David Reed <--none--->
 * 1)                          Simon Edwards <--none--->
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          B. Clifford Neuman <bcn@isi.edu>
 * 1)                          Mark Crispin <MRC@PANDA.COM>
 * 2) PORT 90 also being used unofficially by Pointcast #########
 * 1)                          Charles Watt <watt@sware.com>
 * 1)                          Eliot Moss <EBM@XX.LCS.MIT.EDU>
 * 1)                          Louis Mamakos <louie@sayshell.umd.edu>
 * 1)                          Daniel Tappan <Tappan@BBN.COM>
 * 1)                          Tom Bereiter <--none--->
 * 1)                          Mark Crispin <MRC@PANDA.COM>
 * 1)                Tim Howes <Tim.Howes@terminator.cc.umich.edu>
 * 1)                          Maurice R. Turcotte
 * 2)                <mailrus!uflorida!rm1!dnmrt%rmatl@uunet.UU.NET>
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Geoff Goodfellow <Geoff@FERNWOOD.MPK.CA.US>
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Marshall Rose <mrose@dbc.mtview.ca.us>
 * 1)                          Patrick McNamee <--none--->
 * 1)                          Martin Hamilton <martin@mrrl.lut.as.uk>
 * 1)                          Marvin Solomon <solomon@CS.WISC.EDU>
 * 1)                          Jeremy Siegel <jzs@NSD.3Com.COM>
 * 2)      106        Unauthorized use by insecure poppassd protocol
 * 1)                          Jon Postel <postel@isi.edu>
 * 1)                          Kevin Murphy <murphy@sevens.lkg.dec.com>
 * 1)                          Joyce K. Reynolds <jkrey@isi.edu>

Complete (long!) list here:


 * http://www.iana.org/assignments/port-numbers