DNS Checker & Propagation Map

Check DNS records and global propagation on an interactive world map.

Find the PTR (reverse DNS) hostname configured for an IP address.

Look up registrar, registration dates, name servers and status for any domain.

List a domain's MX records with priority, resolved IPs and SMTP reachability.

Fetch and validate a domain's SPF record, including the 10-DNS-lookup limit.

Build a valid SPF TXT record with IPs, includes and provider presets.

Check a DKIM selector's public key record, algorithm and key length.

Generate a DKIM RSA key pair and the DNS TXT record for your selector.

Analyze a domain's DMARC policy with warnings and a health score.

Create a DMARC TXT record with policy, reporting and alignment settings.

Paste raw email headers to trace the delivery route and authentication results.

Test a mail server's SMTP ports, banner, STARTTLS support and reverse DNS.

Interactive SMTP test on port 25, 465 or 587 with TLS, MAIL FROM and RCPT TO checks.

Get ISP, ASN, location, organization and reverse DNS for any IPv4 or IPv6 address.

Check an IP against major DNS blacklists: Spamhaus, SpamCop, Barracuda, SORBS, UCEPROTECT.

Check a domain on URI blocklists (DBL, SURBL, URIBL) and blacklist status of its MX IPs.

Inspect a domain's SSL/TLS certificate: issuer, expiry, SAN list and chain.

Check which common service ports are open on a host (safe predefined list only).

Run combined DNS, email and security checks and get a 0-100 health score.

Check MX records for a list of domains and export the results as CSV.

Validate SPF records for a list of domains and export the results as CSV.

Check a list of IPs against major DNS blacklists and export the results as CSV.