Domain blacklist checker

Check whether your domain or sending IP is listed on major email blacklists that quietly destroy deliverability.

Free · No signup · Runs in your browser

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Domain or IP

Live DNS lookup · 20 checks/day

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Enter a domain and run the check to see a full report.

About blacklists

Why blacklists matter

Blacklists (DNSBLs) block your mail without notice. One listing can tank inbox placement across providers.

Spikes, complaints, spam traps and bounces get you listed. Clean sending keeps you off.

Most blacklists offer removal once you fix the root cause — but prevention is far cheaper.

FAQ4 entries

Still curious? Our team responds in under an hour.

A real-time database (DNSBL/RBL) of domains and IPs known for spam. Mailbox providers query them to decide whether to block or filter your mail.

Sudden volume spikes, high complaint or bounce rates, hitting spam traps, or sending from a compromised account or shared IP with bad neighbors.

Fix the underlying issue (clean your list, lower complaints, warm up properly), then submit a delisting request on the blacklist's site.

Verify lists, warm up new domains/inboxes, keep complaints under 0.1% and bounces under 2%, and ramp volume gradually.

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Beyond the free tool

Data, warmup, multichannel sequences and AI — one platform, free for 7 days.

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