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Check a site's TLS certificate — expiry, hostname coverage, chain, protocol and cipher — before it takes the site down.
Look up every DNS record for a domain — A, MX, TXT, NS and more — with SPF, DKIM and DMARC problems explained.
Find what an IP address points back to, and verify whether specific domains really share it.
Look up domain registration details over the WHOIS protocol — registrar, dates, nameservers and the status codes that matter.
Resolve a domain or IP to its network details — addresses, hosting provider, network owner and approximate location.
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