All tools
Check status codes, response headers, caching, security headers and server configuration.
Try it →Check certificate validity, expiration, issuer, TLS configuration and certificate chain.
Try it →Follow every redirect and spot loops, broken hops and unnecessary chains.
Try it →Look up DNS records for any domain, including A, AAAA, MX, TXT, NS and CNAME.
Try it →See how your DNS resolves across servers around the world.
Try it →Check when a domain expires before it catches you by surprise.
Try it →Check email authentication and find missing or broken DNS records.
Try it →See exactly where a page's load time goes, from DNS to first byte.
Try it →Look up domain registration, registrar and nameserver information.
Try it →See which AI crawlers and search engines your robots.txt lets in.
Try it →Grade your security headers and see exactly what to add.
Try it →See your public IP address, network and location information.
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