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SESK: Stuff Everyone Should Know · sesk.info/tech-http-default-port-80

What is the default TCP port for an HTTP URI?

The default HTTP port is TCP 80.

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  1. TCP 22
  2. TCP 53
  3. TCP 80 ✔

Why: When an HTTP URI omits an explicit port, clients use TCP port 80 by default. A server can still be configured on another port when the URI names it.

Huh, didn't know that: A default port can be omitted from the URI authority without changing the intended endpoint.

The dad joke
Port 80 opened the web page because it knew the default entrance.
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References

Answer: TCP 80. When an HTTP URI omits an explicit port, clients use TCP port 80 by default. A server can still be configured on another port when the URI names it.

  1. RFC 9110: HTTP Semantics www.rfc-editor.org/rfc/rfc9110.html
    TCP port 80 (the reserved port for WWW services) is the default.
    Checked 2026-10-10.

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