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@debiru
Created May 16, 2020 17:42
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tld のゾーンは awsdns を知っているのか
$ for tld in com net org co.uk; do dig +norec +noall +auth @a.root-servers.net -t ns $tld | sort | head -n 1; done
com. 172800 IN NS a.gtld-servers.net.
net. 172800 IN NS a.gtld-servers.net.
org. 172800 IN NS a0.org.afilias-nst.info.
uk. 172800 IN NS dns1.nic.uk.
$ dig +norec +noall +auth +add @a.gtld-servers.net go90.com
go90.com. 172800 IN NS ns-635.awsdns-15.net.
go90.com. 172800 IN NS ns-481.awsdns-60.com.
go90.com. 172800 IN NS ns-1662.awsdns-15.co.uk.
go90.com. 172800 IN NS ns-1101.awsdns-09.org.
ns-481.awsdns-60.com. 172800 IN A 205.251.193.225
$ dig +norec +noall +auth +add @a.gtld-servers.net debiru.net
debiru.net. 172800 IN NS ns-738.awsdns-28.net.
debiru.net. 172800 IN NS ns-371.awsdns-46.com.
debiru.net. 172800 IN NS ns-1642.awsdns-13.co.uk.
debiru.net. 172800 IN NS ns-1088.awsdns-08.org.
ns-738.awsdns-28.net. 172800 IN A 205.251.194.226
$ dig +norec +noall +auth +add @a0.org.afilias-nst.info hatenadiary.org
hatenadiary.org. 86400 IN NS ns-1954.awsdns-52.co.uk.
hatenadiary.org. 86400 IN NS ns-1037.awsdns-01.org.
hatenadiary.org. 86400 IN NS ns-57.awsdns-07.com.
hatenadiary.org. 86400 IN NS ns-905.awsdns-49.net.
ns-1037.awsdns-01.org. 86400 IN A 205.251.196.13
$ dig +norec +noall +auth +add @dns1.nic.uk jumpseller.co.uk
jumpseller.co.uk. 172800 IN NS ns-320.awsdns-40.com.
jumpseller.co.uk. 172800 IN NS ns-654.awsdns-17.net.
jumpseller.co.uk. 172800 IN NS ns-1469.awsdns-55.org.
jumpseller.co.uk. 172800 IN NS ns-1858.awsdns-40.co.uk.
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debiru commented May 16, 2020

dig した対象のドメイン名は適当です。awsdns を使っていれば何でも良かった。

*.co.ukuk ゾーンから委任されている(co.uk ゾーンは無い)が、uk ゾーンは ADDITIONAL を返さなかった。

ただ、whois を引いてみると awsdns の IP アドレスが載っている。

$ whois jumpseller.co.uk | grep -C2 205.251
    Name servers:
        ns-1469.awsdns-55.org
        ns-1858.awsdns-40.co.uk   205.251.199.66
        ns-320.awsdns-40.com
        ns-654.awsdns-17.net

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