This is a free site for remotely verifying if a port is open or closed.
Check here IP Address or domain:
 | port is closed |
This is a free site for remotely verifying if a port is open or closed. It is useful to users who wish to verify port forwarding and check to see if a server is running or a firewall or ISP is blocking certain ports.
Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful in testing port forwarding setup on a machine. For instance, if you're facing connection issue with a program (email, IM client etc) then it may be possible that the port required by the application is getting blocked by firewall or ISP. In such cases, this tool might help you in diagnosing the issue. It's also useful for security reasons, in case you're worried whether a particular port is open or closed.
Port forwarding or port mapping involves translating the address (or port number to a new destination), accepting the packets and forwarding it (using routing table). It's typically used in connecting remote computers to specific programs running on computer (in a private LAN (Local Area Network)). For example : running a public server (HTTP, port 80) on a computer in a private LAN or granting SSH access to a specific computer in a private LAN etc.