Check IPs on 120+ blacklists
If your mail server IP is blacklisted, your email lands in spam – or is rejected entirely. The Blacklist Check tests your IP against 120+ DNS blacklists in seconds and shows every listing with a link to the delisting page.
Guest mode: limited usage. Register for free for unlimited usage, history & statistics.
Register freeIP Blacklist Check
Enter an IP address to check against 128 DNS-based blacklists
How it works
1. Enter IP
Enter your mail server IP (or check any other IP).
2. Query 120+ lists
The checker queries all blacklists in parallel – within seconds.
3. Fix listings
For every listing you get the direct delisting link or start automatic AI delisting.
Features in detail
120+ blacklists
Spamhaus (SBL, XBL, PBL, ZEN), Barracuda, SORBS, SpamCop, UCEPROTECT and many more.
IPv4 & IPv6
Both address families are fully supported.
Delisting links
For every listing, a direct link to the blacklist removal form.
Monitoring
With account: monitor your IPs hourly and get notified the moment they are listed.
AI Delisting (Alpha)
Our AI agent removes your IP from blacklists automatically – including forms and emails. Currently in alpha phase.
No account needed
Individual checks are free and possible without registration.
Frequently asked questions
My IP is listed – what now?
First fix the cause (open relay, compromised account), then request delisting. The delisting links in the check lead you to the respective forms – or our AI agent handles it automatically.
How long does a delisting take?
Depending on the blacklist, between a few minutes and 48 hours. Lists like Spamhaus usually remove IPs within 24 hours after the cause is fixed.
Are all blacklists queryable for free?
DNS-based blacklists are publicly queryable via DNS – so the check is free for you.
What is the difference between RBL and DNSBL?
Both describe the same principle: IP lists queried via DNS. RBL (Realtime Blackhole List) is the older term, DNSBL today’s standard.