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 24/tcp any private mail system 24 24/udp any private mail system

smtp 25/tcp Simple Mail Transfer <-SMTP smtp 25/udp Simple Mail Transfer <-SMTP

1. 26/tcp Unassigned
2. 26/udp Unassigned

nsw-fe 27/tcp NSW User System FE nsw-fe 27/udp NSW User System FE

1. 28/tcp Unassigned
2. 28/udp Unassigned

msg-icp 29/tcp MSG ICP msg-icp 29/udp MSG ICP

1. 30/tcp Unassigned
2. 30/udp Unassigned

msg-auth 31/tcp MSG Authentication msg-auth 31/udp MSG Authentication

1. 32/tcp Unassigned
2. 32/udp Unassigned

dsp 33/tcp Display Support Protocol dsp 33/udp Display Support Protocol

1. 34/tcp Unassigned
2. 34/udp Unassigned

35 35/tcp any private printer server 35 35/udp any private printer server

1. 36/tcp Unassigned
2. 36/udp Unassigned

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

1. 40/tcp Unassigned
2. 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]

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

1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. PORT 90 also being used unofficially by Pointcast #########

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

1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 106 Unauthorized use by insecure poppassd protocol

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

Complete (long!) list here:

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