Port Chekcer

PortChecker is a fast, browser-based tool that checks whether a TCP port on an IP address or domain is reachable from the public internet. It’s ideal for developers, DevOps/IT teams, and home-lab users who need to verify firewall rules, cloud security groups, router port forwarding, or server exposure. Local tests can be misleading—services may be running but still blocked by NAT, ISP restrictions, wrong public IP/DNS, or OS firewalls. PortChecker provides an external, real-world connectivity check so you can quickly confirm if a port is open, closed, or unreachable and focus your troubleshooting on the right layer.

No installs, no command line—just enter the host and port and get clear results in seconds.