port

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Contents

Definition

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)

Ports in Networking

In an IP network, a port number is used to identify a network service, which allows one physical computer to listen to various protocols at the same time. The possible range for port numbers is 1 to 65535. This divides up into:

1-1024 well known ports
1024-49151 registered and unregistered ports
49152-65535 private (or dynamic) ports


Well Known Ports

The well known ports are ports between 0 and 1024, 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).


17-110

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
#                26/tcp    Unassigned
#                26/udp    Unassigned
nsw-fe           27/tcp    NSW User System FE
nsw-fe           27/udp    NSW User System FE
#                28/tcp    Unassigned
#                28/udp    Unassigned
msg-icp          29/tcp    MSG ICP
msg-icp          29/udp    MSG ICP
#                30/tcp    Unassigned
#                30/udp    Unassigned
msg-auth         31/tcp    MSG Authentication
msg-auth         31/udp    MSG Authentication


#                32/tcp    Unassigned
#                32/udp    Unassigned
dsp              33/tcp    Display Support Protocol
dsp              33/udp    Display Support Protocol

#                34/tcp    Unassigned
#                34/udp    Unassigned
35               35/tcp    any private printer server
35               35/udp    any private printer server
#                36/tcp    Unassigned
#                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


#                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]
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               57/tcp    any private terminal access
57               57/udp    any private terminal access
xns-mail         58/tcp    XNS Mail
xns-mail         58/udp    XNS Mail
59               59/tcp    any private file service
59               59/udp    any private file service

60               60/tcp    Unassigned
60               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               75/tcp    any private dial out service
75               75/udp    any private dial out service
deos             76/tcp    Distributed External Object Store
deos             76/udp    Distributed External Object Store
77               77/tcp    any private RJE service
77               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 <-HTTP
http             80/udp    World Wide Web HTTP <-HTTP
www              80/tcp    World Wide Web HTTP <-HTTP
www              80/udp    World Wide Web HTTP <-HTTP
www-http         80/tcp    World Wide Web HTTP <-HTTP
www-http         80/udp    World Wide Web HTTP <-HTTP
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               87/tcp    any private terminal link
87               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
########### 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
##########      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

Common but unregistered ports

The unregistered ports are ports above 1024 (up to 65535) that may be on common use but are not registered with the IANA.

All ports

see Category:Ports and help it grow.

External Links

Complete (long!) list here: