What is a DNSBL?
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What is a DNSBL?
A DNSBL is a “Domain Name System Block List”: A list of IP address ranges or other information compiled and presented as a DNS zone.
- Information in DNS format is easy to query and transport, and its small answers are very “light” on bandwidth overhead.
- Spamhaus Zen is a DNSBL, as are its component zones of SBL, XBL, CSS, and PBL.
- Spamhaus DBL is a domain DNSBL. It may be used to identify URL domains with poor domain reputation, or as a “Right Hand Side Block List” (RHSBL) for email addresses.