Open Port Checker: Test Ports 80, 443, 22, and Scan for Vulnerabilities
Examine open ports on your server or router, understand the risks of exposed management services, and learn how to audit your perimeter security.
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What is a Port and Port Checking?
In computer networking, a port is a logical endpoint (0 to 65535) that directs incoming network packets to specific software services. Port Checking verifies whether a server or router accepts incoming connections on a specific port.
Common Standard Ports
- Port 80 (HTTP): Plaintext web traffic.
- Port 443 (HTTPS): TLS/SSL encrypted web traffic.
- Port 22 (SSH): Secure remote administration shell.
- Port 21 (FTP): File Transfer Protocol.
- Port 3306 (MySQL) & 5432 (PostgreSQL): Database engines.
- Port 3389 (RDP): Windows Remote Desktop.
Security Warning: Database (3306, 5432) and remote admin ports (22, 3389) should never be exposed to
0.0.0.0/0. Restrict access via VPNs or static IP whitelists.
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β Frequently Asked Questions (FAQ)
What does "Filtered" status mean? βΎ
A firewall is actively intercepting and dropping connection requests without responding with a TCP RST packet.