Free website and domain checkers
Check a site’s SSL certificate, domain registration, DNS records, redirects, headers and meta tags. Useful for site owners, SEO audits and troubleshooting.
14 tools, all free with no sign-up.
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SSL certificate checker
Inspect a website's TLS certificate: issuer, validity, SANs and days left.
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WHOIS lookup
Get the public WHOIS registration record for a domain or IP.
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DNS lookup
Look up A, AAAA, CNAME, MX, NS, TXT, SOA and CAA records for a domain.
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URL redirect checker
Follow a URL's redirect chain hop by hop and see where it ends up.
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Meta tags checker
Read a page's title, description, Open Graph and Twitter tags.
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HTTP headers lookup
See the HTTP response headers a URL returns.
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Website hosting checker
Find out where a website is hosted: its IPs, reverse DNS, name servers and mail servers.
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IP lookup
Get details about an IP address or domain: type, reverse DNS and country.
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Reverse IP lookup
Find the hostname (PTR record) for an IP address.
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Ping (TCP)
Measure connection time to a server on port 80 or 443. Uses TCP, since ICMP isn't available from a web server.
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HTTP/2 checker
Check whether a website supports HTTP/2.
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Brotli compression checker
Check whether a website serves Brotli-compressed responses.
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Subnet calculator New
Work out the network, broadcast, mask and host range of an IPv4 CIDR block.
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Gravatar checker
See whether an email address has a Gravatar image.