subdomain www only

1. whois

東京国立博物館 - Tokyo National Museum
tnm.go.jp
http://www.tnm.go.jp

$ dig -t ns tnm.go.jp @a.dns.jp
tnm.go.jp.              86400   IN      NS      yamato.tnm.go.jp.

;; ADDITIONAL SECTION:
yamato.tnm.go.jp.       86400   IN      A       202.243.162.2

2. history

$ dig yamato.tnm.go.jp
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 49377


2.162.243.202.in-addr.arpa. 43200 IN    PTR     dns1.tnm.jp.

$ dig -t ns tnm.go.jp @202.243.162.2
tnm.go.jp.              43200   IN      NS      dns2.tnm.jp.
tnm.go.jp.              43200   IN      NS      dns1.tnm.jp.

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