Free tool
Blacklist Checker
Enter a domain or sending IP and we'll check it against well-known DNS blacklists (DNSBLs) that mailbox providers use to filter mail.
How it works
- 1Enter a domain or IP address.
- 2We query several public blacklists via DNS.
- 3See whether it's listed anywhere that could hurt delivery.
Questions
Frequently asked
What is an email blacklist?
A DNSBL is a published list of domains or IPs known for spam. Mailbox providers check them when deciding whether to accept your mail.
I'm listed — what now?
Each blacklist has a delisting process. Fix the underlying cause first (a compromised account, a dirty list) or you'll be relisted.
Why might a check be inconclusive?
Some blacklists block queries from public DNS resolvers. We report those as unverifiable rather than guessing.
Can I check a whole list at once?
This free tool checks one at a time. To verify a full list — email, phone and company together — upload a CSV to BounceBlock and preview your first 100 rows free.
Stop wasting hours on dead leads.
Upload your list and see how clean it really is — free, in under two minutes.
100 free creditsNo credit cardCancel anytime