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DNSBL Real-time blacklist checks
Email Deliverability focused
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Why teams use this blacklist checker

Find reputation problems before mail delivery and trust suffer

Improve email deliverability

Check if your sending IP is listed before campaigns, transactional mail, or client migrations.

Investigate blocked mail

When mail is rejected or lands in spam, blacklist checks help identify reputation issues quickly.

Check domains and IPs

Paste a domain, full URL, or IPv4 address. Domains are resolved to A records before DNSBL checks.

What to do if your IP is listed

  • Check mail logs for compromised accounts, open relays, spam scripts, or unexpected outbound volume.
  • Verify SPF, DKIM, DMARC, PTR, and FCrDNS so receivers can authenticate your mail correctly.
  • Patch malware or CMS vulnerabilities before requesting delisting from the blacklist provider.
  • Contact your hosting provider if the listing is caused by neighboring IP reputation or routed abuse.
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FAQ

It checks an IPv4 address against common DNSBL and RBL providers that mail servers use to detect spam, botnet, proxy, malware, and abusive traffic sources.

Yes. If you enter a domain or URL, the tool resolves its IPv4 A records and checks those IP addresses.

Receiving mail servers often use IP reputation and blacklist data. A listed IP can cause emails to be rejected or delivered to spam.

Most DNSBL providers are IPv4-focused, so this tool checks IPv4 addresses and domain A records only.

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