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Tools/Domains and certificates/SSL/TLS checker

SSL/TLS checker

tested from the server

Certificate, chain, expiry and supported protocols.

Read more: SSL certificate errors: what they mean and how to fix them

More toolsDNS lookup DNSBL blacklist check E-mail: SPF, DKIM, DMARC IPv4 subnet calculator IPv6 subnet calculator

Tools

Addressing

Domains and certificates

Internet

Server-side diagnostics

Content

Information

Where the data comes from

Calculators run in your browser. DNS, whois and BGP use public services, and the tests marked “server” (SSL/TLS, ports, traceroute, MTU, DNSBL) run from the routing.pl server.