Toxic Link Checker
Check whether a domain's IP is listed on major DNS blocklists (Spamhaus, Barracuda, SpamCop, SORBS). Useful before accepting a backlink or partner. Free.
Frequently asked
What does 'listed' mean?
The domain's mail/host IP appears on a public spam/malware blocklist. That's a red flag for backlink quality and email deliverability — investigate before associating with it.
Why might a clean domain show as not checkable?
Some blocklists rate-limit or block queries from public DNS resolvers. We report each zone's result independently so a single failing zone doesn't poison the verdict.