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Queries public DNSBL blacklists (Barracuda, SpamCop, UCEPROTECT for IPs; Spamhaus DBL for domains) to find out if a target is reported for spam or abuse-related behavior.
A listed IP or domain was reported for spam, abuse or compromise-related behavior at some point. It does not always mean it is still an active problem today.
We query publicly accessible DNSBL lists with no account or key required. This is not a definitive "malicious" or "safe" verdict, just one more signal worth investigating.
Frequently asked questions
Each list has its own delisting request process, usually after resolving the cause that triggered the report.
This check focuses on spam/abuse DNSBL lists. For malware or phishing signals, use "Malware domain check" or "Phishing indicators".