SEO tools / Server, DNS and security
Security headers checker
Grade a site's HTTP security headers A–F.
More server, dns and security tools
DNS lookupA, AAAA, CNAME, MX, NS, TXT, SOA and CAA records of a domain.
DNS propagation checkerAsk eight public DNS resolvers around the world for the same record.
IP lookupNetwork owner (ASN), country and reverse DNS of an IP address or domain.
Reverse DNS lookupThe host name behind an IP address (PTR record).
What is my IPYour public IP address and browser details.
SSL checkerCertificate issuer, expiry, names, chain and TLS version.
Ping testHow fast a server answers (TCP handshake time from our server).
Website hosting checkerWho hosts a website: IP, network, country and server software.
How to use the security headers checker
Grade a site's HTTP security headers A–F. Enter the page address above and press the button. Results appear on this page and you can share the link.
Visitors can run 30 checks a day. Create a free account for projects, site audits, rank tracking and saved keyword lists.