Port 80 – HTTP Protocol Specification

Technical analysis, security advisories, vulnerability mitigation, and firewall syntax for TCP/UDP port 80 (HTTP).

Port Number 80

Transport Protocol TCP

Port Range Type Well-Known (0-1023)

Default Status Public Safe

Service Description & Architectural Context

Hypertext Transfer Protocol for standard World Wide Web browsing.

IANA / RFC Designation:

Port 80 is assigned to HTTP under the Internet Assigned Numbers Authority (IANA) service name registry. In enterprise infrastructure and homelab setups, services listening on this port must follow the principle of least privilege.

Security Analysis & Attack Surface Assessment

All public HTTP traffic should issue a 301 permanent redirect to HTTPS (443).

Hardening Recommendations:

Do not expose port 80 to public WAN interfaces unless authenticated TLS or VPN wrapping is strictly enforced.
Enforce rate-limiting using Fail2ban, CrowdSec, or cloud edge DDoS protection.
Audit active listening sockets locally: ss -tulpn | grep :80 or netstat -ano | findstr :80.

Firewall Rule Snippets for Port 80

UFW (Ubuntu / Debian Linux)

sudo ufw allow 80/tcp

iptables (Standard Linux Kernel)

sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT

Windows PowerShell (Defender Advanced Firewall)

New-NetFirewallRule -DisplayName "Allow Port 80" -Direction Inbound -LocalPort 80 -Protocol TCP -Action Allow

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