All tools / Email & DNS
Diagnose and fix email deliverability. Generate correct SPF, DKIM, and DMARC records, check a domain’s full email health in one pass, read raw email headers and DMARC aggregate reports, look up MX, DNS, and PTR records, check sender IPs against blacklists, and verify BIMI. DNS queries go to Cloudflare over HTTPS; pasted records, headers, and reports are parsed in your browser and never uploaded.
Look up a domain's mail (MX) servers in priority order, with their IP addresses.
Query A, AAAA, MX, TXT, NS, SOA, CNAME, and CAA records for any domain.
Check an IP address or domain against major email DNS blacklists (DNSBLs).
Check a domain's SPF, DKIM, and DMARC records plus its MX, with plain-English notes.
Trace the delivery path, read SPF, DKIM, and DMARC verdicts, and spot spoofing signs in raw email headers. Parsed entirely in your browser.
Read DMARC aggregate XML reports in your browser. Upload the .xml, .gz, or .zip attachment and see who passes and fails.
Look up PTR records for an IP address and see the associated hostnames.
Look up domain registration dates, registrar, nameservers, and status via RDAP.
Build a valid SPF TXT record from includes, IP addresses, and an all mechanism.
Build a DMARC TXT record for _dmarc with policy, reporting, and alignment options.
Generate an RSA key pair and DKIM DNS TXT record locally in your browser.
Look up a domain's BIMI TXT record for brand logo and authority evidence URLs.