Port 80 — HTTP

TCP · Port 80/TCP is the default port for HTTP (Hypertext Transfer Protocol) traffic, used for transmitting web pages and other data between a client and server. This port is a common target for attacks such as cross-site scripting and SQL injection. Secure configurations should ensure that only necessary services are listening on this port.

Port Number: 80
Service Name: HTTP
Protocol: TCP
Common Software: Apache, Nginx, IIS, Caddy

Security Notes

Redirect all HTTP to HTTPS. Implement HSTS.

FAQ

What is port 80 used for?

Port 80 is used for HTTP. Port 80/TCP is the default port for HTTP (Hypertext Transfer Protocol) traffic, used for transmitting web pages and other data between a client and server. This port is a common target for attacks such as cross-site scripting and SQL injection. Secure configurations should ensure that only necessary services are listening on this port. Common software: Apache, Nginx, IIS, Caddy.

Is port 80 dangerous to leave open?

Redirect all HTTP to HTTPS. Implement HSTS.

How do I check if port 80 is open?

Use nmap: nmap -p 80 <target> or check locally: ss -tlnp | rg 80