PSBL - Passive Spam BlockList DNS Blacklist

Check IP Address

Enter an IP address to check if it's listed on the PSBL real-time DNS blacklist.

Multi Check

Check multiple IP addresses simultaneously against our blacklist and other DNSBLs.

Learn More →

DNS Query Example

Query PSBL directly using standard DNS tools:

nslookup 8.8.8.8.psbl.sorbl.com
dig 8.8.8.8.psbl.sorbl.com

What is PSBL?

PSBL (Passive Spam BlockList) is a real-time DNS blacklist that helps email administrators protect their mail servers from spam. Our passive spamtrap system captures spam emails and lists the originating IP addresses, making it an effective tool for email security.

Unlike active blacklists that probe systems, PSBL only lists IP addresses that have been confirmed as spam sources through our spamtrap network. This ensures accurate, actionable data for email filtering and spam protection.