Every internet-connected device listens on numbered ports for incoming connections. Some are expected (like 443 for HTTPS), but others can be dangerous if left exposed - such as remote desktop (3389) or database ports (3306, 5432).

How does this port checker work?

It checks your public IP against Shodan's InternetDB, a continuously updated index of internet-facing hosts, and shows which TCP ports are visible from the public internet on your connection.

What port presets are available?

Presets include All Common (20 widely used ports), Web, Remote Access, Databases, Email, and High Risk. High Risk covers services like Telnet, SMB, RDP, Redis, and Memcached that are often abused when exposed.

Can I scan any IP address?

This tool is meant for scanning your own public IP. The input is tied to your connection so you can spot exposed services on your network before attackers do.

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Open Port Checker

Scan your own public IP address for common open ports to identify exposed services and potential attack vectors. Scans are limited to your own connection.

What are open ports?

Every internet-connected device listens on numbered ports for incoming connections. Open ports are entry points - some are expected (like port 443 for HTTPS websites), but others can be dangerous if left exposed, such as remote desktop (3389) or database ports (3306, 5432).

This tool checks your IP against Shodan's InternetDB, a continuously updated index of internet-facing hosts, to reveal which ports are visible from the public internet. Use it to spot potential security risks before attackers do.

Port Presets

All Common - 20 of the most widely used TCP ports
Web - ports 80, 443, 8080, 8443, 8000, 8888
Remote Access - SSH (22), Telnet (23), RDP (3389), VNC (5900/5901)
Databases - MSSQL (1433), MySQL (3306), PostgreSQL (5432), Redis (6379), MongoDB (27017)
Email - SMTP (25), POP3 (110), IMAP (143), SMTPS (465), Submission (587)
High Risk - FTP (21), Telnet (23), SMB (445), RDP (3389), Metasploit (4444), VNC (5900), Redis (6379), Memcached (11211)

Frequently Asked Questions

What are open ports?: Every internet-connected device listens on numbered ports for incoming connections. Some are expected (like 443 for HTTPS), but others can be dangerous if left exposed - such as remote desktop (3389) or database ports (3306, 5432).
How does this port checker work?: It checks your public IP against Shodan's InternetDB, a continuously updated index of internet-facing hosts, and shows which TCP ports are visible from the public internet on your connection.
What port presets are available?: Presets include All Common (20 widely used ports), Web, Remote Access, Databases, Email, and High Risk. High Risk covers services like Telnet, SMB, RDP, Redis, and Memcached that are often abused when exposed.
Can I scan any IP address?: This tool is meant for scanning your own public IP. The input is tied to your connection so you can spot exposed services on your network before attackers do.

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