Blacklist Checker

Check an IP or a domain's mail servers against active DNS blocklists, with reasons.

Ready

Blocklist status

Enter an IP or domain

IP —

PTR —

Listed

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Not listed

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Not available

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Blocklist report

Enter an IPv4 address or a domain above to see which active blocklists list it, why, and how to get removed, plus its reverse DNS.

Fair-use limit: 20 checks per hour and 100 per day for each visitor IP address. Results are cached for 10 minutes. A domain check covers up to 4 IPs.