watchWWW/gruntingfrog.comについて、ここに記述してください。

%dig www.gruntingfrog.com @a.gtld-servers.net ~

; <<>> DiG 9.9.0 <<>> www.gruntingfrog.com @a.gtld-servers.net
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13034
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 5
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;www.gruntingfrog.com.          IN      A

;; AUTHORITY SECTION:
gruntingfrog.com.       172800  IN      NS      ns1.nameresolve.com.
gruntingfrog.com.       172800  IN      NS      ns2.nameresolve.com.
gruntingfrog.com.       172800  IN      NS      ns3.nameresolve.com.
gruntingfrog.com.       172800  IN      NS      ns4.nameresolve.com.

;; ADDITIONAL SECTION:
ns1.nameresolve.com.    172800  IN      A       66.96.142.146
ns2.nameresolve.com.    172800  IN      A       65.254.254.170
ns3.nameresolve.com.    172800  IN      A       66.96.142.148
ns4.nameresolve.com.    172800  IN      A       65.254.254.172

;; Query time: 107 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Mon Aug 15 21:34:08 2016
;; MSG SIZE  rcvd: 197

%dig www.gruntingfrog.com @ns1.nameresolve.com. ~

; <<>> DiG 9.9.0 <<>> www.gruntingfrog.com @ns1.nameresolve.com.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41531
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1680
;; QUESTION SECTION:
;www.gruntingfrog.com.          IN      A

;; ANSWER SECTION:
www.gruntingfrog.com.   3600    IN      CNAME   ghs.google.com.

;; AUTHORITY SECTION:
google.com.             3600    IN      SOA     ns1.dotster.com. dnsadmin.dotster.com. 2013120983 10800 3600 604800 3600

;; Query time: 174 msec
;; SERVER: 66.96.142.146#53(66.96.142.146)
;; WHEN: Mon Aug 15 21:35:01 2016
;; MSG SIZE  rcvd: 131

ここにある google.com SOAはなんのため?

-- ToshinoriMaeno 2016-08-15 12:36:01

googleが答えてくるのはこういう感じだが、問い合わせ先により返事が変わるかも。

;; ANSWER SECTION:
google.com.             60      IN      SOA     ns3.google.com. dns-admin.google.com. 130269118 900 900 1800 60