IP Blacklist Checker

Free online IP Blacklist Checker. No sign-up needed, and it runs in your browser.

Check if an IP address or mail server is on spam blacklists (DNSBLs) like Spamhaus, SpamCop and Barracuda.

The lists are asked through Cloudflare DNS. Some lists don’t answer lookups made that way — those show "Check on their site".

How to use

  1. Add your text or file.
  2. Adjust the options if needed.
  3. Copy or download the result.