How is this different from Port Reference Lookup?

Well-Known Ports focuses on the 0-1023 range — the 'system' ports that typically require root to bind. Port Reference Lookup covers the full spectrum.

Are these ports reserved?

IANA reserved, yes. Real systems can still use them for other services, but it's bad practice and confuses users.

80 is the registered HTTP port. 8080 is an unofficial convention for HTTP alternate (often dev servers). Same protocol, different port.

Are TCP and UDP ports separate?

Yes — each protocol has its own port number space. A service can use both (DNS uses TCP and UDP 53). The tool shows both columns.

Well-Known Ports | DevTools Surf

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Example: Well-Known Ports

A worked example, rendered from real sample data. Sign in to run the tool on your own input.

Input

Output

PORT   PROTO   SERVICE        NOTES
── Web ──
  443    tcp     https          HTTP over TLS / HTTP/2

About Well-Known Ports

Well-Known Ports preview - Networking tool

40+ standard TCP/UDP ports — search by number, service, or keyword. Part of the DevTools Surf developer suite. Browse more tools in the Networking collection.

Use Cases

Identify what service a port number belongs to
Find the default port before configuring a firewall
Troubleshoot connection errors by cross-referencing port usage
Document internal-service port allocations for onboarding docs

Tips

Range 0-1023 is 'well-known' per IANA; requires root to bind on Unix
Search by port number, service name, or any keyword in the notes
Many common dev ports are listed (3000, 5173, 11434)

Fun Facts

Port 22 (SSH) was registered by Tatu Ylönen in 1995 — he emailed IANA saying 'we'd like port 22' and they just... gave it to him.
Port 80 (HTTP) was assigned by Tim Berners-Lee in 1991. Before that, the World Wide Web used port 2784 during its CERN development phase.
Ports 49152–65535 are 'ephemeral' ports — your OS randomly picks one for each outgoing TCP connection, which is why 'netstat' shows so many high-numbered ports.

FAQ

How is this different from Port Reference Lookup?: Well-Known Ports focuses on the 0-1023 range — the 'system' ports that typically require root to bind. Port Reference Lookup covers the full spectrum.
Are these ports reserved?: IANA reserved, yes. Real systems can still use them for other services, but it's bad practice and confuses users.
What's 80 vs 8080?: 80 is the registered HTTP port. 8080 is an unofficial convention for HTTP alternate (often dev servers). Same protocol, different port.
Are TCP and UDP ports separate?: Yes — each protocol has its own port number space. A service can use both (DNS uses TCP and UDP 53). The tool shows both columns.

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