Common Ports Reference

Search and filter common TCP/UDP ports — SSH, HTTP, databases, container runtimes, and more. Instant lookups, no network calls.

About Common Ports Reference

Every TCP/UDP service listens on a port: well-known ports (0–1023) belong to system services, registered ports (1024–49151) cover most application and database software, and the dynamic range (49152–65535) is used for ephemeral connections. Recognizing the common ones — 22 SSH, 80/443 HTTP(S), 3306 MySQL, 5432 PostgreSQL, 6379 Redis, 27017 MongoDB — makes debugging connectivity, reading firewall logs, and configuring services far faster.

Remember that the official IANA list is just a registry: an application can listen on any port it likes, and firewalls or NAT can remap everything. When something is not connecting, verify the actual listening port (ss -tlnp on Linux, netstat -an elsewhere) rather than assuming the default. TLS services often run on the non-SSL port with STARTTLS, so a port alone does not tell you whether the traffic is encrypted.