List of TCP and UDP port numbers

well-known portportwell-knownport numberwell known portswell-known ports194/TCP35444573631
This is a list of TCP and UDP port numbers used by protocols of the application layer of the Internet protocol suite for the establishment of host-to-host connectivity.wikipedia
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Post Office Protocol

POPPOP3POP email
A POP3 server listens on well-known port number 110 for service requests.

Gopher (protocol)

GopherGopher protocolgopher client
IANA has assigned TCP port 70 to the Gopher protocol.

Echo Protocol

Echo
A host may connect to a server that supports the Echo Protocol using the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP) on the well-known port number 7.

HTTPS

secure websiteSsecure server
However, because host (website) addresses and port numbers are necessarily part of the underlying TCP/IP protocols, HTTPS cannot protect their disclosure.

Simple Network Management Protocol

SNMPSNMP management systemSNMP Trap
The SNMP agent receives requests on UDP port 161.

Remote Shell

rshremote shells
The daemon typically uses the well-known Transmission Control Protocol (TCP) port number 514.

Internet Message Access Protocol

IMAPIMAP4dIMAP
An IMAP server typically listens on well-known port 143, while IMAP over SSL (IMAPS) uses 993.

Internet Relay Chat

IRCclientIRC client
IRC was originally a plain text protocol (although later extended), which on request was assigned port 194/TCP by IANA.

Open Network Computing Remote Procedure Call

ONC RPCSun's RPCONC remote procedure call
Access to RPC services on a machine are provided via a port mapper that listens for queries on a well-known port (number 111) over UDP and TCP.

Syslog

syslogdcentral loggingsyslog servers
When operating over a network, syslog uses a client-server architecture where the server listens on a well-known or registered port for protocol requests from clients.

User Datagram Protocol

UDPUDP/IPUDP protocol
The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic.
This field identifies the sender's port, when used, and should be assumed to be the port to reply to if needed. If not used, it should be zero. If the source host is the client, the port number is likely to be an ephemeral port number. If the source host is the server, the port number is likely to be a well-known port number.

Trivial File Transfer Protocol

TFTPtftpdTFTPD.EXE
TFTP is a simple protocol for transferring files, implemented on top of the UDP/IP protocols using well-known port number 69. TFTP was designed to be small and easy to implement, and therefore it lacks most of the advanced features offered by more robust file transfer protocols.

Big Brother (software)

Big Brother
Clients send status information over port TCP port 1984 at five-minute intervals.

Internet Printing Protocol

IPPInternet Printing Protocol (IPP)Port 631
IPP uses TCP with port 631 as its well-known port.

Transmission Control Protocol

TCPTCP/IPACK
The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic.
List of TCP and UDP port numbers (a long list of ports and services)

Teredo tunneling

TeredoTeredo server and relay
The Teredo server listens on UDP port 3544.

Internet Assigned Numbers Authority

IANAInternet Assigned Numbers Authority (IANA) Internet Assigned Numbers Authority (IANA)
The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses.
List of TCP and UDP port numbers

Network socket

socketsocketsraw socket
On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the well-known ports.
List of TCP and UDP port numbers

Firewall (computing)

firewallfirewallspacket filter
The bulk of Internet communication in 20th and early 21st century used either Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) in conjunction with well-known ports, enabling firewalls of that era to distinguish between, and thus control, specific types of traffic (such as web browsing, remote printing, email transmission, file transfer), unless the machines on each side of the packet filter used the same non-standard ports.

CUPS

Common Unix Printing Systemcups-pdf
On all platforms, CUPS has a web-based administration interface that runs on port 631.