DNS Checker & Propagation Map
See how your domain resolves across the globe in seconds. My DNS Hub queries 33 public DNS servers worldwide and shows results on an interactive map and country list — ideal after updating records, switching hosts, or launching a new website.
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More diagnostic tools
Email authentication, blacklists, SSL, WHOIS and more.
🌐 DNS
List a domain's MX records with priority, resolved IPs and SMTP reachability.
SPF ValidatorFetch and validate a domain's SPF record, including the 10-DNS-lookup limit.
SPF GeneratorBuild a valid SPF TXT record with IPs, includes and provider presets.
DKIM ValidatorCheck a DKIM selector's public key record, algorithm and key length.
DKIM GeneratorGenerate a DKIM RSA key pair and the DNS TXT record for your selector.
DMARC AnalyzerAnalyze a domain's DMARC policy with warnings and a health score.
DMARC GeneratorCreate a DMARC TXT record with policy, reporting and alignment settings.
Email Header AnalyzerPaste raw email headers to trace the delivery route and authentication results.
SMTP DiagnosticsTest a mail server's SMTP ports, banner, STARTTLS support and reverse DNS.
SMTP TesterInteractive SMTP test on port 25, 465 or 587 with TLS, MAIL FROM and RCPT TO checks.
📍 IP
Get ISP, ASN, location, organization and reverse DNS for any IPv4 or IPv6 address.
Blacklist CheckerCheck an IP against major DNS blacklists: Spamhaus, SpamCop, Barracuda, SORBS, UCEPROTECT.
Domain Blacklist CheckerCheck a domain on URI blocklists (DBL, SURBL, URIBL) and blacklist status of its MX IPs.
