Free DNS Tools
Diagnose your DNS instantly from the browser: propagation, records and email security. Free, no signup.
These tools run directly in your browser using DNS-over-HTTPS (DoH), querying the major public resolvers. Nothing to install, we never store your queries, and you don't need to create an account.
DNS Propagation Checker
Check whether your DNS change is already visible on the world's major public resolvers.
Open toolDNS Record Lookup
Look up any DNS record for a domain: A, AAAA, MX, TXT, CNAME, NS, SOA and CAA.
Open toolSPF, DMARC & DKIM Checker
Check your domain's email security: SPF, DMARC and DKIM records and possible issues.
Open toolDNSSEC Checker
Check whether a domain is signed with DNSSEC and whether the chain of trust validates correctly.
Open toolReverse DNS (PTR)
Resolve the hostname (PTR) associated with an IP address, IPv4 or IPv6.
Open toolDNS Speed Test
Measure which public DNS resolver responds fastest from your connection.
Open toolWHOIS / RDAP
Look up a domain's registration data: registrar, dates, status and nameservers.
Open toolSSL Certificate Checker
Check a domain's SSL/TLS certificate: issuer, validity, expiry and SANs.
Open toolMy IP Address
Find out your public IP address, your ISP, your ASN and your approximate location.
Open toolSubnet / CIDR Calculator
Calculate network, broadcast, mask, host range and number of addresses of a subnet.
Open toolHTTP Security Headers
Analyze a site's HTTP security headers (HSTS, CSP, X-Frame-Options...).
Open toolBlacklist Checker (DNSBL)
Check whether an IP is on spam blacklists (DNSBL/RBL).
Open toolMore tools coming soon, including server-side checks: blacklists (DNSBL), WHOIS and SSL.
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