DNS & NetworkNew
Online Port Checker
Check whether public TCP ports are reachable on a domain or IP address.
Online Port Checker
DNS & NetworkNewCheck whether public TCP ports are reachable on a domain or IP address.
AK
Check whether selected TCP ports are reachable on a public IP address or domain.
Common ports
Check whether selected TCP ports are reachable on a public IP address or domain.
CLI equivalent
nc -vz example.com 80, 443Checks run from the app server against public hosts. Private, localhost, and internal network targets are blocked for safety.
This public tool should not be used to scan localhost, private networks, or internal infrastructure from the app server.
An open TCP port means a connection was accepted. Application-level authentication, TLS, or protocol behavior can still fail.