IP & domain blacklist checker
Find out if your mail server or domain is on an email blocklist — and exactly how to get removed.
5 free checks per day · then from $0.04 per check — pricing
What the Blacklist Checker checks
- 20+ IP blocklists (IPv4 and IPv6)
- Domain blocklists (RHSBL/URIBL)
- Mail servers of a domain checked automatically
- Listing reasons and return codes
- Delisting links per list
- Our own resolver — no "public resolver" errors
How it works
- 1
Enter an IP address or a domain
- 2
We query every list in parallel
- 3
Follow the delisting link for each listing
Frequently asked questions
Why are some lists marked as minor?
Only a few blocklists are used widely by big mailbox providers. A listing on a small list rarely affects delivery; a listing on a major list does.
Why is Spamhaus missing?
Spamhaus only allows free queries for non-commercial use. Their data requires a commercial feed for services like ours. You can check Spamhaus directly at check.spamhaus.org.
How do I get delisted?
First fix the cause (compromised account, open relay, infected device, missing unsubscribe). Then use the delisting link next to each listing — many lists also expire entries automatically.