DNS tools

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

Query 30+ public DNS resolvers across six continents at once and see exactly which locations have your new record and which still serve the old one.

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.

Subnet, cron, base64, JWT, hashes — private, in your browser.