"PBL Zone Listing" vs. "Master Range" - What is the difference?

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A “PBL Zone Listing” is a subset of a “PBL Master Range”.

PBL Zone Listing

“PBL Zone Listing” refers to subsets of Master Ranges which are intended for inclusion in the PBL.
“PBL Zone Listings” are IP addresses that are listed in the DNSBL zone pbl.spamhaus.org
- Email sent from outbound email servers running on IP addresses listed in the DNSBL pbl.spamhaus.org (PBL Zone Listings) may be rejected by any server using PBL or Zen data.
Authorized ISPs may add or remove any IP range(s) from the subset PBL Zones Listings that are within their Master Ranges.

Master Range

A “Master Range” is typically the same as the allocation the ISP is granted by their Regional Internet Registry (RIR)
“Master Ranges” are the IP ranges assigned to a PBL account by Spamhaus, and define the IP ranges in which that account is authorized to create PBL Zone Listing records;
- Spamhaus assigns Master Ranges based on information gathered from Whois, rWhois or rDNS after the application for that range is received.
None, some, or all IPs in a Master Range may be listed in PBL Zone Listings by the ISP at their discretion, as long as the changes remain within the guidelines expressed previously.

NOTE:

Changes to Master Ranges can only be requested by entities who are authorized.
Once an ISP requests and is granted authority over their Master Range(s), and Spamhaus validates that request, ISP can change “PBL Zones Listings” within their “Master Range(s)”.
Such changes will become active after the next zone build, within 15 minutes of the change.

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