Is this a real TCP port scanner?

Due to browser security restrictions, this tool uses HTTP/HTTPS probing to detect if ports respond. It's useful for checking web-accessible services but cannot perform raw TCP scans. For comprehensive port scanning, use tools like nmap on your local machine.

What do open, closed, and filtered mean?

Open means the port responded to the probe (service is running). Closed means the connection was refused (port is reachable but no service). Filtered means the probe timed out (port may be blocked by firewall or service is slow to respond).

Can I scan any server?

You should only scan hosts you own or have explicit permission to test. Unauthorized port scanning may violate terms of service or laws in some jurisdictions. This tool limits scans to prevent abuse.

Why are all ports showing as filtered?

If all ports show as filtered, the host may have a strict firewall blocking all connections, the domain may not resolve, or there may be network issues. Try scanning a known accessible site like google.com to verify the tool is working.

How accurate are the results?

Results are generally reliable for HTTP/HTTPS ports but may be less accurate for non-HTTP services due to browser limitations. Response times are approximate. For authoritative results, use dedicated network tools.

port-scanner

Online Port Scanner

Check if common TCP ports are open on any domain or IP address. Scan for web servers, databases, email servers, and remote access services.

About this tool:

Scans 20 common TCP ports
Uses HTTP/HTTPS probing (browser security limits raw TCP)
Best for checking web-accessible services
For comprehensive port scanning, use tools like nmap locally

Only scan hosts you own or have permission to test.

Common Port Reference

Web Services

80 - HTTP
443 - HTTPS
8080 - HTTP Alternate
8443 - HTTPS Alternate

Databases

3306 - MySQL
5432 - PostgreSQL
6379 - Redis
27017 - MongoDB

Remote Access

22 - SSH
23 - Telnet
3389 - RDP
5900 - VNC

Email

25 - SMTP
143 - IMAP
993 - IMAPS
587 - Submission

Frequently Asked Questions

This scanner checks 20 common TCP ports including: HTTP (80, 8080), HTTPS (443, 8443), SSH (22), FTP (21), SMTP (25, 465, 587), IMAP (143, 993), POP3 (110, 995), DNS (53), MySQL (3306), PostgreSQL (5432), Redis (6379), RDP (3389), VNC (5900), and Telnet (23).

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