Free utilities for checking servers, ports, domains and tunnel configs. No sign-up needed.
Measure your download, upload, ping and jitter.
Is a port open on a host? Quick TCP check with response time.
Scan the common or tunnel ports of a host in one go.
Read the HTTP response of a host, or test a WebSocket handshake.
See who issued a certificate, who it covers and when it expires.
Look up A, AAAA, CNAME, MX, NS, TXT and SOA records.
Registrar, creation and expiry dates of a domain.
Resolve a hostname to its IP address from our server.
The IP address the internet sees you as.
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