Port Checker Online
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A port check tells you whether a given host accepts incoming connections on a specific TCP port. The tool sends a request to the specified IP address or domain and determines one of three statuses based on the response: the port is open, closed, or filtered by a firewall.
An open port means a service is listening and accepting connections. A closed port means the remote side actively refused the connection. If there is no response at all, the port is most likely hidden behind a firewall that silently drops incoming packets instead of replying.
Checking a port is useful in many situations: setting up port forwarding on a home router for game servers, torrent clients, or security cameras; verifying that a website, mail server, or FTP server is reachable from the outside; configuring remote access over SSH or RDP and confirming the port is actually forwarded and visible from outside the network; or general network troubleshooting, such as finding out whether an ISP or corporate firewall is blocking a specific port.
For convenience, the form includes quick-select buttons for common ports - HTTP, HTTPS, SSH, FTP, RDP, MySQL, PostgreSQL, Redis, MongoDB, and other widely used services - so there is no need to memorize port numbers manually.