Free Blacklist Check
Check whether a public IP or hostname appears on common DNS-based blacklists that can affect email delivery and network reputation.
Common use cases
- Investigate email bounces or deliverability problems.
- Review a server IP before migrating mail or web workloads.
- Compare blacklist findings with IP reputation and domain scan results.
Frequently asked questions
What is a DNSBL?
A DNSBL is a DNS-based blacklist that can list IPs associated with spam, abuse, open relays, or other unwanted behavior.
Does a listing always mean abuse?
Not always. Treat listings as investigation signals and follow the listed provider’s delisting process when appropriate.