IP & Domain Blacklist Checker
Check whether an IP address or domain is listed on the major spam blacklists (DNSBLs) in seconds. If your mail server is listed, your emails are being filtered as spam — or not arriving at all.
Why a blacklisting quietly kills your email
Spam blacklists (also called DNSBLs or RBLs) are lists of IP addresses and domains known for sending spam. Mail providers like Gmail, Outlook, and Yahoo check these lists on every incoming message — if your sending IP or domain is on one, your emails are silently sent to spam or rejected outright.
The worst part is that nothing tells you. A shared IP gets abused by another tenant, a compromised account starts blasting spam, or a misconfigured server trips a spam trap — and your invoices, password resets, and newsletters simply stop landing. Most senders only discover it after customers complain that they never got the email.
What this blacklist checker does
Enter an IP address or a domain. For a domain we resolve its IPv4 address first, then query the major DNSBLs — Spamhaus ZEN, SpamCop, Barracuda, SORBS, Abuseat CBL, and UCEPROTECT — and show whether each one lists you, reports you clean, or didn't answer.
It's a read-only lookup that stores nothing and needs no login. Because some lists refuse queries from cloud IP addresses, a one-off check is a snapshot, not a guarantee — for reputation you can trust, monitor it continuously so you're alerted the instant a listing appears.
How do I check if my IP is blacklisted?
Enter your mail server's IP address (or your domain) above and run the check. The tool queries the major spam blacklists and shows, for each one, whether you're listed, clean, or the list didn't respond.
My domain shows clean but my email still goes to spam — why?
Blacklists are only one spam signal. Missing or failing SPF, DKIM, and DMARC records, poor sending reputation, or spammy content can also send mail to spam even when no blacklist lists you. A clean blacklist result rules out one common cause, not all of them.
What does "No answer" mean next to a list?
Some blacklists — notably Spamhaus and Barracuda — block lookups that come from shared cloud or public-resolver IP addresses. When that happens we show "No answer" instead of pretending the result is clean, so you know the list simply didn't respond.
How do I get removed from a blacklist?
Each list runs its own delisting process — find your IP on the list's website and follow its removal request steps. First fix the root cause (a compromised account, an open relay, or a spam trap hit), or you'll be relisted. Then monitor your reputation so a future listing never goes unnoticed.
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