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DNS Blocklist Basics

ID: 4010be75-9f23-577e-8e62-d8ce70f004b4

STIX ID: report--4010be75-9f23-577e-8e62-d8ce70f004b4

Feed Name: The Spamhaus Project

Date Published: 2020-11-11

Date Updated: 2026-04-30

Author: Matt Stith

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This document summarizes the different Spamhaus blocklists (SBL, XBL, PBL, AuthBL, DBL, ZRD, HBL), explaining which types of IPs, domains, or cryptographic hashes each list contains and the general purpose of each list for filtering malicious or misconfigured senders.

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