Free Open Port Scanner Online
Scan common TCP ports on any server to detect open, closed, or filtered status.
Scan Results for:
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Online Open Port Scanner
Our Free Open Port Scanner is an essential network diagnostic tool that tests common TCP ports on your server, router, or firewall to determine their status (Open or Closed). It helps identify potential vulnerabilities and confirms that specific services are accessible from the outside.
Common Ports Checked
Web Services
HTTP (80) & HTTPS (443): Essential for web traffic. HTTPS encrypts data and is the modern standard.
Server Administration
SSH (22), Telnet (23), RDP (3389): Used for remote management. Leaving these open to the public without restrictions is highly dangerous.
Database Servers
MySQL (3306), PostgreSQL (5432): Databases should generally be closed to external traffic and only accessible via localhost.
Email Protocols
SMTP (25/587), POP3 (110), IMAP (143/993): Standard ports used for sending and receiving emails.
Security Best Practices
As a general rule of thumb, you should operate under the principle of least privilege. Only open ports that are absolutely necessary. If your server does not host a website, port 80 and 443 should be closed. If you need remote access via SSH (22), consider restricting access to specific IP addresses using a firewall, or moving the service to a non-standard port.