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IP Blacklist Checker
Enter an IPv4 address to check it against Spamhaus, SpamCop and other major DNSBLs — live, right now.
Enter an IPv4 address above to check it against major blacklists.
Sending in bulk? Email Marketing VPS plans include a dedicated IPv4 address and custom rDNS so your sending reputation is yours alone, not shared with other tenants.
Frequently Asked Questions
A DNSBL (DNS-based blackhole list) is a list of IP addresses reported for spam or abusive behavior. Many mail servers and spam filters check these lists and reject or quarantine mail from a listed IP — so a listing directly hurts deliverability even if the mail itself is legitimate.
Each list linked in the results has its own delisting/removal process — search “[list name] delist” for the specific one that flagged you. First, confirm nothing on the server is actually sending spam (a compromised script, an open relay, or a mailing list without real opt-in) before requesting removal — clearing a listing without fixing the underlying cause usually means getting relisted. Our abuse handling process covers how we handle reports on our own network.
Spamhaus ZEN, SpamCop, Barracuda Reputation, SORBS, PSBL and GBUdb Truncate — a short list of long-established, actively-maintained lists, rather than every obscure list that exists. Being clean on these six is a reasonable proxy for general sending reputation.