On Mon, Feb 24, 2025 at 08:58:48PM -0500, Harry Hoffman via NANOG <nanog@nanog.org> wrote a message of 195 lines which said:
> Has this become common practice? Is there a definitive way to determine > subdomains? I seem to recall that "older" dns server software wouldn't > allow this but it could be that my memory is faulty. You already got three excellent replies but I may add that there *was* an attempt at IETF to design a way to find administrative boundaries in the DNS but it basically failed: https://mailarchive.ietf.org/arch/msg/dbound/F9SkNAZmYHGKlRwbn5Il78pOkFs/ https://datatracker.ietf.org/doc/draft-sullivan-dbound-problem-statement/ https://datatracker.ietf.org/wg/dbound/ My favorite example, when I lecture on DNS, is gouv.fr (no zone cut between gouv.fr and fr but it is administratively distinct).
