DNSの階層的問合せの実演例
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> nslookup -type=ns .
サーバー: pedns.nagano.ac.jp
Address: 172.20.0.1
権限のない回答: # この中から１つを適当に選んで次の問い合わせ先にする
(root) nameserver = b.root-servers.net
(root) nameserver = g.root-servers.net
(root) nameserver = i.root-servers.net
(root) nameserver = m.root-servers.net
(root) nameserver = a.root-servers.net
(root) nameserver = d.root-servers.net
(root) nameserver = l.root-servers.net
(root) nameserver = k.root-servers.net
(root) nameserver = h.root-servers.net
(root) nameserver = e.root-servers.net
(root) nameserver = f.root-servers.net
(root) nameserver = c.root-servers.net
(root) nameserver = j.root-servers.net
g.root-servers.net internet address = 192.112.36.4
g.root-servers.net AAAA IPv6 address = 2001:500:12::d0d
m.root-servers.net internet address = 202.12.27.33
b.root-servers.net internet address = 192.228.79.201
a.root-servers.net internet address = 198.41.0.4
a.root-servers.net AAAA IPv6 address = 2001:503:ba3e::2:30
e.root-servers.net internet address = 192.203.230.10
e.root-servers.net AAAA IPv6 address = 2001:500:a8::e
# １つ下の階層へ
> nslookup -type=ns jp. m.root-servers.net
in-addr.arpa nameserver = a.in-addr-servers.arpa
in-addr.arpa nameserver = d.in-addr-servers.arpa
in-addr.arpa nameserver = b.in-addr-servers.arpa
in-addr.arpa nameserver = c.in-addr-servers.arpa
in-addr.arpa nameserver = f.in-addr-servers.arpa
in-addr.arpa nameserver = e.in-addr-servers.arpa
a.in-addr-servers.arpa internet address = 199.212.0.73
b.in-addr-servers.arpa internet address = 199.253.183.183
c.in-addr-servers.arpa internet address = 196.216.169.10
d.in-addr-servers.arpa internet address = 200.10.60.53
e.in-addr-servers.arpa internet address = 203.119.86.101
f.in-addr-servers.arpa internet address = 193.0.9.1
a.in-addr-servers.arpa AAAA IPv6 address = 2001:500:13::73
b.in-addr-servers.arpa AAAA IPv6 address = 2001:500:87::87
c.in-addr-servers.arpa AAAA IPv6 address = 2001:43f8:110::10
d.in-addr-servers.arpa AAAA IPv6 address = 2001:13c7:7010::53
e.in-addr-servers.arpa AAAA IPv6 address = 2001:dd8:6::101
f.in-addr-servers.arpa AAAA IPv6 address = 2001:67c:e0::1
サーバー: UnKnown
Address: 202.12.27.33
# ここに並ぶのが日本のドメインを司るサーバ
jp nameserver = e.dns.jp
jp nameserver = c.dns.jp
jp nameserver = f.dns.jp
jp nameserver = g.dns.jp
jp nameserver = d.dns.jp
jp nameserver = h.dns.jp
jp nameserver = b.dns.jp
jp nameserver = a.dns.jp
a.dns.jp internet address = 203.119.1.1
b.dns.jp internet address = 202.12.30.131
c.dns.jp internet address = 156.154.100.5
d.dns.jp internet address = 210.138.175.244
e.dns.jp internet address = 192.50.43.53
f.dns.jp internet address = 150.100.6.8
g.dns.jp internet address = 203.119.40.1
h.dns.jp internet address = 65.22.40.25
a.dns.jp AAAA IPv6 address = 2001:dc4::1
b.dns.jp AAAA IPv6 address = 2001:dc2::1
c.dns.jp AAAA IPv6 address = 2001:502:ad09::5
d.dns.jp AAAA IPv6 address = 2001:240::53
e.dns.jp AAAA IPv6 address = 2001:200:c000::35
f.dns.jp AAAA IPv6 address = 2001:2f8:0:100::153
h.dns.jp AAAA IPv6 address = 2a01:8840:1ba::25
> nslookup -type=ns ac.jp. g.dns.jp
サーバー: UnKnown
Address: 203.119.40.1
jp
primary name server = z.dns.jp
responsible mail addr = root.dns.jp
serial = 1497261603
refresh = 3600 (1 hour)
retry = 900 (15 mins)
expire = 1814400 (21 days)
default TTL = 900 (15 mins)
> nslookup -type=ns nagano.ac.jp. z.dns.jp
サーバー: UnKnown
Address: 203.119.1.10
nagano.ac.jp nameserver = dns-x.sinet.ad.jp
nagano.ac.jp nameserver = ns.nagano.ac.jp
ns.nagano.ac.jp internet address = 202.209.194.5
> nslookup -type=any www.nagano.ac.jp. ns.nagano.ac.jp
DNS request timed out.
timeout was 2 seconds.
サーバー: UnKnown
Address: 172.31.1.5
DNS request timed out.
timeout was 2 seconds.
*** UnKnown への要求がタイムアウトしました
# このように学内から大学の外向けサーバへのアクセスができないので
# 代わりに sinetにあるセカンダリサーバに問い合わせる
> nslookup -type=any www.nagano.ac.jp. dns-x.sinet.ad.jp
サーバー: dns-x1.sinet.ad.jp
Address: 150.100.18.2
www.nagano.ac.jp internet address = 202.209.194.1
nagano.ac.jp nameserver = ns.nagano.ac.jp
nagano.ac.jp nameserver = dns-x.sinet.ad.jp
ns.nagano.ac.jp internet address = 202.209.194.5
dns-x.sinet.ad.jp internet address = 150.100.18.10
dns-x.sinet.ad.jp internet address = 150.100.18.2
dns-x.sinet.ad.jp internet address = 150.100.18.6
dns-x.sinet.ad.jp AAAA IPv6 address = 2001:2f8:0:12::53
dns-x.sinet.ad.jp AAAA IPv6 address = 2001:2f8:0:10::53
dns-x.sinet.ad.jp AAAA IPv6 address = 2001:2f8:0:11::53
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