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Ports Reference

Reference of well-known and registered ports: service names, protocol, typical use and common misconfigurations. Search by port number or service keyword.

About common ports

Entries marked Default are vendor defaults for admin interfaces, portals, VPNs, game and dev servers. Administrators often move them, so treat them as a starting point rather than a rule. Entries marked Insecure carry plaintext credentials, run without authentication or are known amplification or backdoor ports.

TCP and UDP ports identify services on a host. IANA maintains the registered-ports registry; this reference covers the ports developers, sysadmins and analysts encounter daily: SSH, HTTP, database servers, game servers, IoT devices, industrial control and more.

All data is static and searchable entirely in your browser.

Questions

Why are some ports marked insecure?
Certain ports carry protocols that are plaintext (FTP 21, Telnet 23) or notoriously prone to weak configuration (Redis 6379, Memcached 11211, MongoDB 27017). They should not be exposed to the public internet.
What counts as a well-known port?
Ports 0 through 1023 require root/admin to bind and are reserved by IANA for protocols like HTTP (80), HTTPS (443), SSH (22) and DNS (53).
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