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Blacklist checker.

Check a sending IP or domain against ten major DNS blocklists (Spamhaus, SpamCop, Barracuda and more) in one query. Live results, no account, no card.

Enter a sending IPv4 address or a domain (we check its A record) against major DNS blocklists over live DNS - nothing is stored.

Listed? Do this next

A listing is a symptom - delisting without fixing the cause just gets you re-listed. Work through how to get removed from a blacklist and how to check if you're blacklisted for the full playbook.

Find and fix the cause
A spike in bounces or complaints, a compromised account, or a dirty imported list is usually behind a listing. Clean the list and stop the source before you request removal.
Delist, then monitor
Request removal at each list's site, then keep watch so the next listing doesn't cost you a week of deliverability before you notice.

Why listings happen - and how to avoid them

Most blacklist listings trace back to poor list hygiene: spam traps in a purchased list, high bounce rates, and complaints all signal abuse to the lists. The durable fix is sending only to addresses that are real and engaged - verify your list, keep bounces near zero, and your IPs stay clean.

Blacklist checker FAQ

A DNS blocklist (DNSBL, sometimes RBL) is a published list of IP addresses (and sometimes domains) that a provider has flagged for sending spam or abuse. Mailbox providers query these lists in real time when they receive your mail; a listing on a major one can send your messages to spam or get them rejected at the door. This tool queries ten well-known lists at once for the IP or domain you enter.

It means at least one blocklist has flagged that IP, and receivers who trust that list may throttle, spam-folder, or reject mail from it. The impact depends on the list - a Spamhaus listing is far more consequential than a small niche one. Any listing is worth investigating: find the cause (a compromised account, a dirty list, a shared IP neighbor), fix it, then request removal at the specific provider.

Each list runs its own removal (delisting) process on its website - you look up the IP there and follow its steps. But delisting only sticks if you fix the underlying cause first: stop the spam source, clean your list, and confirm your authentication. Many lists re-list automatically if the bad behavior continues, and some expire listings on their own once the abuse stops.

Some blocklists (Spamhaus and Barracuda in particular) restrict free queries from shared or cloud resolvers and answer with a special code instead of a real result. When that happens we mark the list “No answer” rather than guess, so a blocked query is never mistaken for a clean or a listed result. Query those lists directly from your own resolver, or use continuous monitoring, for an authoritative answer.

Check the IP your mail actually sends from - that's what receivers evaluate against IP blocklists. If you enter a domain, this tool resolves its A record and checks that IP, which is a reasonable proxy but may not be your true sending IP if you send through an ESP. For an ESP, your mail usually goes out on the provider's shared or dedicated IPs, which they manage.

Don't find out from a bounce

A one-off check is a snapshot. Qualisend blacklist monitoring watches your IPs and domains across the major lists and alerts you the moment you're listed.

See monitoring