For what it's worth, pool.ntp.org has 5 DNS authorities listed on three
continents. So I think the DNS servers themselves are pretty redundant,
although I can't comment on the architecture behind it that's creating
the DNS records to serve.
$ dig pool.ntp.org any
;; AUTHORITY SECTION:
pool.ntp.org. 54148 IN NS aventura.bhms-groep.nl.
pool.ntp.org. 54148 IN NS ns1.us.bitnames.com.
pool.ntp.org. 54148 IN NS ns1.mailworx.net.
pool.ntp.org. 54148 IN NS usenet.net.nz.
pool.ntp.org. 54148 IN NS zbasel.fortytwo.ch.
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