How do I check if port 80 is open?

Enter your public IP or hostname into the scanner tool and click Check. A sub-second raw TCP socket handshake will be initiated from our edge server to port 80 on your target. If the 3-way handshake finishes with SYN-ACK, the port is OPEN. If an RST packet is returned, the host is reachable but the port is CLOSED. If packets time out without response, the port is FILTERED by an ISP or firewall.

Is port 80 safe to expose to the public internet?

Port 80 is generally safe to expose when running standard, patched services with strong authentication. However, always ensure your software is updated and access control policies are strictly enforced.

Why does port 80 show as closed or filtered?

If port 80 reports CLOSED or FILTERED, confirm that: 1) Your service is actively running and bound to 0.0.0.0 (not just localhost/127.0.0.1); 2) Your router has a port forwarding rule directing external port 80 to your machine's local IP; 3) Your operating system firewall (Windows Defender Firewall, ufw, or iptables) allows incoming connections on port 80.

PORT 80 TCP Web Low Risk

Port 80 (HTTP (Web Server)) Open Check

Q: What is port 80 used for?

Port 80 is the standard TCP port used for HTTP (Web Server). It is commonly used by Nginx, Apache HTTP Server, Caddy, Cloudflare Tunnel, Lighttpd. Standard port for unencrypted World Wide Web traffic and web server delivery.

Standard port for unencrypted World Wide Web traffic and web server delivery.

Live Socket Reachability Probe

Pre-configured for Port 80

Port Scanner

Quick:

Recent Probes 0

Stored locally in browser • 0 logs on server

No recent scans recorded.

Target hosts and tested ports will appear here automatically for fast 1-click re-testing.

Auto-prunes oldest probes beyond 10 entries (FIFO)

Port Specifications & Network Behavior

Standard Port Number 80

Primary Service HTTP (Web Server)

Transport Protocol TCP

Traffic Classification Web

Residential ISP Status Typically unrestricted by consumer ISPs

Security Exposure Low Suitable for public internet hosting with authentication

Security Advisory: HTTP (Web Server) (Port 80)

Transmits data in plaintext. Best practice is to automatically redirect inbound port 80 requests to encrypted HTTPS port 443.

Port Forwarding & Troubleshooting Checklist

If port 80 returns CLOSED or FILTERED, work through this verified diagnostic checklist:

1 Verify web server daemon (Nginx/Apache) is running via 'systemctl status nginx'.
2 Confirm router forwards external WAN port 80 to your internal host static LAN IP (e.g. 192.168.1.50).
3 Inspect ISP contract to ensure residential web hosting on port 80 is not blocked upstream.

Verify Host Is Listening Locally

Windows (PowerShell) netstat -ano | findstr :80

Linux / macOS (Bash) ss -tulpn | grep :80