World Wide Web HTTP (tcp/udp).
Quick facts
Description
World Wide Web HTTP (tcp/udp).
Well-known ports are assigned by IANA to system-level services; binding them usually requires administrative privileges.
Security notes
HTTP. Always redirect to HTTPS and enable HSTS to prevent downgrade attacks.
Related ports
What uses port 80?
Port 80 primarily carries the http service. Some common well-known ports include:
Port ranges
| Range | Explanation |
|---|---|
| Well-known (0–1023) | Reserved for system services; binding usually requires admin privileges. |
| Registered (1024–49151) | Available to user applications; IANA registers common services here. |
| Dynamic / private (49152–65535) | Used for ephemeral client connections. |
Frequently asked questions
A port number is a transport-layer address used independently by TCP and UDP; http typically runs over its documented transport protocol.
Yes — most services let you configure the listening port, but make sure clients and firewalls are updated and you avoid conflicts.
Sources & standards
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