DNS tools

Query every record type a domain publishes, with the TTLs that decide how long changes take.

Query every common DNS record type for a domain, with TTLs, straight from an authoritative resolver.

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

Reference

Look something up without running a check.

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

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

ERR_CONNECTION_REFUSED, NXDOMAIN, SSL errors — decoded.

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