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Open Port Checker

Check if a specific port on your network is open and accessible from the internet.

By checking a port, you affirm that you have permission to test the entered IP address and port. You agree to our Terms of Service and Privacy Policy.

Cheat Sheet

Port Service
80, 8080 HTTP
443, 8443 HTTPS
20, 21 FTP
53 DNS
22 SSH
25, 587, 465 SMTP
143 IMAP
23 Telnet
110 POP3
Other
3306 MySQL
5432 PostgreSQL
1433 SQL Server
3389 RDP
25565 Minecraft
27015 Source Engine Games

About Port Checker

This port checker will help you determine if a port on your network is visible to outside connections. It's useful for diagnosing network issues and checking the visbility status of services.

Port Mapping

Port mapping is the process of associating a port number with a specific service or application. It allows multiple services to run on the same machine while still being accessible from the internet.

Blocked Ports

Sometimes, ports may be blocked by your ISP or network admin for security reasons. If a port is blocked, it will not be accessible from the internet even if it's open on your local network.


Note: you are only able to use this tool to check ports on networks you have permission to test. If the network does not belong to you, please do not use this tool.