$ for tld in jp kr fr de it es ch tw il ca au br int; do host -t ns $tld|sort; for dns in `host -t ns $tld|cut -d ' ' -f 4`; do host -t aaaa $dns; done|sort; done
jp name server a.dns.jp.
jp name server b.dns.jp.
jp name server c.dns.jp.
jp name server d.dns.jp.
jp name server e.dns.jp.
jp name server f.dns.jp.
a.dns.jp has AAAA address 2001:dc4::1
d.dns.jp has AAAA address 2001:240::53
e.dns.jp has AAAA address 2001:200:0:1::4
f.dns.jp has AAAA address 2001:2f8:0:100::153
(略)
同じホスト名で複数のAAAAをもつものは1つとすると、v6対応率の高い順に
jp 4 of 6
ch 3 of 7
tw 3 of 7
br 2 of 5
il 2 of 6
int 2 of 6
fr 2 of 8
it 2 of 8
es 2 of 9
kr 1 of 7
au 1 of 7
ca 1 of 8
de 1 of 11
TLD対抗v6対応合戦 (スコア:1, 興味深い)
つーことで、ちょっと調べてみた。
$ for tld in jp kr fr de it es ch tw il ca au br int; do host -t ns $tld|sort; for dns in `host -t ns $tld|cut -d ' ' -f 4`; do host -t aaaa $dns; done|sort; done
jp name server a.dns.jp.
jp name server b.dns.jp.
jp name server c.dns.jp.
jp name server d.dns.jp.
jp name server e.dns.jp.
jp name server f.dns.jp.
a.dns.jp has AAAA address 2001:dc4::1
d.dns.jp has AAAA address 2001:240::53
e.dns.jp has AAAA address 2001:200:0:1::4
f.dns.jp has AAAA address 2001:2f8:0:100::153
(略)
同じホスト名で複数のAAAAをもつものは1つとすると、v6対応率の高い順に
jp 4 of 6
ch 3 of 7
tw 3 of 7
br 2 of 5
il 2 of 6
int 2 of 6
fr 2 of 8
it 2 of 8
es 2 of 9
kr 1 of 7
au 1 of 7
ca 1 of 8
de 1 of 11
一応v6大国の面子は保った…のかな。
でもjpもv6トランスポートだとときどき引けなかったりするけど。
なおus uk fi cn nz com net org gov edu mil biz infoは全滅。