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Common Ports Reference

Reference of common TCP and UDP port numbers with service names.
Port Registry
264 entries
Port DetailsPick a port to see its details.

Search or browse to find a TCP/UDP port. The selected entry shows the registered name, aliases and a ready-to-run command to check what is listening on that port.

Port quick guide
0-1023Well-known ports, assigned to core services like HTTP, SSH and DNS.
1024-49151Registered ports, used by vendor applications such as MySQL and PostgreSQL.
49152-65535Dynamic / private ports, assigned by the OS for outbound connections.
Common80 HTTP, 443 HTTPS, 22 SSH, 53 DNS, 25 SMTP, 3306 MySQL, 5432 PostgreSQL.
Tool Introduction

This reference follows the classic /etc/services layout. The Well-Known group covers ports 1-1023; UNIX-specific ports cover classic BSD services such as rlogin and syslog; Registered ports are vendor-assigned by IANA; DDP lists Datagram Delivery Protocol ports on AppleTalk; Kerberos covers the Project Athena/MIT authentication suite; Unregistered lists ports used by common Red Hat Enterprise Linux services without an IANA registration. Bracketed names in square brackets are aliases or daemon names (e.g. biff[comsat]).

Port numbers are drawn from the source table; registered names are primary, unregistered names are aliases. Ranges: 0-1023 well-known, 1024-49151 registered, 49152-65535 dynamic. To see what a port is used for on your own machine, pick an entry and run the Check what is listening command.