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Domain tools

Who a domain is registered through, when it was created and when it needs renewing.

WHOIS lookup

Look up domain registration data: who it is registered through, when it was created, when it expires and its nameservers.

Other categories

Website checks Network tools DNS tools Security & TLS Email tools All tools

Reference

Look something up without running a check.

HTTP status codes

What 301, 403, 502 and the rest actually mean, and how to fix them.

Common ports

What listens on each port and whether it should ever face the internet.

Browser errors

ERR_CONNECTION_REFUSED, NXDOMAIN, SSL errors — decoded.

DNS record types

A, MX, TXT, CNAME and friends, with real examples.