Port 80: HTTP
Port 80 is plain HTTP, the default for unencrypted web traffic. Modern sites redirect it to HTTPS on port 443, but port 80 is still used for the initial redirect and for ACME certificate checks.
TCPWebUnencrypted by defaultIANA assigned
| Port number | 80 |
|---|---|
| Service | Hypertext Transfer Protocol |
| Protocol | TCP |
| Category | Web |
| Default encryption | No |
Security note. Port 80 is not encrypted by default. Restrict it to trusted networks, or use an encrypted alternative where one exists, to avoid exposing credentials and data in transit.
Frequently asked questions
What is port 80 used for?
Port 80 is plain HTTP, the default for unencrypted web traffic. Modern sites redirect it to HTTPS on port 443, but port 80 is still used for the initial redirect and for ACME certificate checks.
Is port 80 TCP or UDP?
Port 80 (HTTP) uses TCP.
Is port 80 secure?
Port 80 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 80 on my firewall?
Only if you specifically need HTTP. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.