Free domain tools

Focused, instant checks for any domain. Need everything at once? Run a full domain report. Run a site of your own? Embed a domain checker on it for free.

• SPF Record Checker — Check any domain's SPF record (and DMARC) for free. See instantly whether email authentication is set up to stop spoofing.
• SSL Certificate Checker — Check any website's SSL/TLS certificate for free: validity, issuer, expiry date, days remaining, and protocol.
• DNS Lookup Tool — Free DNS lookup for any domain. See A, AAAA, MX, NS and TXT records at a glance, plus whether SPF and DMARC are configured.
• DMARC Checker — Check any domain's DMARC record for free. See whether a policy is published and whether it is set to none, quarantine, or reject.
• Security Header Checker — Check any website's HTTP security headers for free and get a letter grade. See which of HSTS, CSP, X-Frame-Options and more are missing.
• Domain Blacklist Checker — Check whether a domain or its IP is on email blocklists for free. We query DNSBL and Spamhaus and return a reputation score.
• Email Header Analyzer — Paste raw email headers to trace the delivery path and check SPF, DKIM and DMARC results. Free, no signup.