What is the Domain Blocklist (DBL)?
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What is the Domain Blocklist (DBL)?
The Spamhaus Domain Blocklist (DBL) is a list of domain names with poor reputation. It is published in a domain DNSBL format. These domain reputations are calculated from many factors and maintained in a database, which in turn feeds the DBL zone itself.
- It ONLY lists domains. No IP addresses are listed in the DBL.
- A dedicated team of specialists maintain the DBL’s reputation database.
- Data from many sources is used to build and maintain a large set of rules.
- The DBL zone is continually updated, and the data is served from over 80 mirrors world-wide.
- These rules control an automated system that constantly analyses a large portion of the world’s email flow and its domains.
- Most DBL listings occur automatically, although where necessary, Spamhaus researchers will add or remove listings manually.
- Listings will expire without intervention after the domain stops matching the criteria that caused the listing.
DBL data is exchanged with other Spamhaus systems, resulting in further listings in the DBL or in IP addresses being listed in other Spamhaus zones.
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