unbound/log/21xx.comについて、ここに記述してください。

$ dig -t ns 210236163162dns.com

; <<>> DiG 9.9.5-3ubuntu0.7-Ubuntu <<>> -t ns 210236163162dns.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29329
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;210236163162dns.com.           IN      NS

;; Query time: 1790 msec
;; SERVER: 127.0.0.2#53(127.0.0.2)
;; WHEN: Mon Jan 25 10:46:40 JST 2016
;; MSG SIZE  rcvd: 48


[1453686398] unbound[1723:0] info: resolving 210236163162dns.com. NS IN

[1453686398] unbound[1723:0] info: response for 210236163162dns.com. NS IN
[1453686398] unbound[1723:0] info: reply from <com.> 192.55.83.30#53
[1453686398] unbound[1723:0] info: query response was REFERRAL

$ dig -t ns 210236163162dns.com @192.55.83.30

; <<>> DiG 9.9.5-3ubuntu0.7-Ubuntu <<>> -t ns 210236163162dns.com @192.55.83.30
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 445
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 3
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;210236163162dns.com.           IN      NS

;; AUTHORITY SECTION:
210236163162dns.com.    172800  IN      NS      ns1.dns-diy.net.
210236163162dns.com.    172800  IN      NS      ns2.dns-diy.net.

;; ADDITIONAL SECTION:
ns1.dns-diy.net.        172800  IN      A       216.245.197.34
ns2.dns-diy.net.        172800  IN      A       64.31.42.226

;; Query time: 75 msec
;; SERVER: 192.55.83.30#53(192.55.83.30)
;; WHEN: Mon Jan 25 11:06:03 JST 2016
;; MSG SIZE  rcvd: 127

net NS はどこからのものか。

[1453686398] unbound[1723:0] info: resolving ns1.dns-diy.net. A IN
[1453686398] unbound[1723:0] info: response for ns1.dns-diy.net. A IN
[1453686398] unbound[1723:0] info: reply from <net.> 192.26.92.30#53
[1453686398] unbound[1723:0] info: query response was REFERRAL

[1453686398] unbound[1723:0] info: resolving dns-diy.net. NS IN
[1453686398] unbound[1723:0] info: resolving ns2.dns-diy.com. A IN
[1453686398] unbound[1723:0] info: response for ns2.dns-diy.com. A IN
[1453686398] unbound[1723:0] info: reply from <com.> 192.55.83.30#53
[1453686398] unbound[1723:0] info: query response was REFERRAL

[1453686398] unbound[1723:0] info: resolving dns-diy.com. NS IN
[1453686399] unbound[1723:0] info: response for dns-diy.net. NS IN
[1453686399] unbound[1723:0] info: reply from <net.> 192.31.80.30#53
[1453686399] unbound[1723:0] info: query response was REFERRAL

[1453686399] unbound[1723:0] info: resolving ns1.dns-diy.com. A IN
[1453686399] unbound[1723:0] info: response for ns2.dns-diy.com. A IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was nodata ANSWER

[1453686399] unbound[1723:0] info: response for ns1.dns-diy.com. A IN
[1453686399] unbound[1723:0] info: reply from <com.> 192.48.79.30#53
[1453686399] unbound[1723:0] info: query response was REFERRAL

[1453686399] unbound[1723:0] info: response for dns-diy.com. NS IN
[1453686399] unbound[1723:0] info: reply from <com.> 192.33.14.30#53
[1453686399] unbound[1723:0] info: query response was REFERRAL

また別の名前が、...

[1453686399] unbound[1723:0] info: resolving ns2.china-channel.com. A IN
[1453686399] unbound[1723:0] info: resolving ns1.china-channel.com. A IN
[1453686399] unbound[1723:0] info: response for ns1.dns-diy.com. A IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.com.> 218.85.139.32#53
[1453686399] unbound[1723:0] info: query response was nodata ANSWER

[1453686399] unbound[1723:0] info: response for ns1.dns-diy.com. A IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.com.> 218.85.139.32#53
[1453686399] unbound[1723:0] info: query response was ANSWER

[1453686399] unbound[1723:0] info: response for dns-diy.com. NS IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was ANSWER

[1453686399] unbound[1723:0] info: response for ns2.dns-diy.com. A IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was ANSWER

[1453686399] unbound[1723:0] info: response for ns1.china-channel.com. A IN
[1453686399] unbound[1723:0] info: reply from <com.> 192.5.6.30#53
[1453686399] unbound[1723:0] info: query response was REFERRAL

[1453686399] unbound[1723:0] info: resolving china-channel.com. NS IN
[1453686399] unbound[1723:0] info: response for ns2.china-channel.com. A IN
[1453686399] unbound[1723:0] info: reply from <com.> 192.26.92.30#53
[1453686399] unbound[1723:0] info: query response was REFERRAL

[1453686399] unbound[1723:0] info: response for ns2.china-channel.com. A IN
[1453686399] unbound[1723:0] info: reply from <china-channel.com.> 218.85.139.32#53
[1453686399] unbound[1723:0] info: query response was nodata ANSWER
[1453686399] unbound[1723:0] info: response for china-channel.com. NS IN
[1453686399] unbound[1723:0] info: reply from <com.> 192.42.93.30#53
[1453686399] unbound[1723:0] info: query response was REFERRAL

[1453686399] unbound[1723:0] info: response for ns1.china-channel.com. A IN
[1453686399] unbound[1723:0] info: reply from <china-channel.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was nodata ANSWER

[1453686399] unbound[1723:0] info: response for ns1.dns-diy.net. A IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.net.> 120.52.19.211#53
[1453686399] unbound[1723:0] info: query response was nodata ANSWER

[1453686399] unbound[1723:0] info: response for ns1.china-channel.com. A IN
[1453686399] unbound[1723:0] info: reply from <china-channel.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was ANSWER
[1453686399] unbound[1723:0] info: response for ns2.china-channel.com. A IN
[1453686399] unbound[1723:0] info: reply from <china-channel.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was ANSWER
[1453686399] unbound[1723:0] info: response for china-channel.com. NS IN
[1453686399] unbound[1723:0] info: reply from <china-channel.com.> 218.107.207.123#53
[1453686399] unbound[1723:0] info: query response was ANSWER

[1453686399] unbound[1723:0] info: response for dns-diy.net. NS IN
[1453686399] unbound[1723:0] info: reply from <dns-diy.net.> 58.216.26.218#53
[1453686399] unbound[1723:0] info: query response was ANSWER
[1453686400] unbound[1723:0] info: response for ns1.dns-diy.net. A IN
[1453686400] unbound[1723:0] info: reply from <dns-diy.net.> 120.52.19.211#53
[1453686400] unbound[1723:0] info: query response was ANSWER
[1453686400] unbound[1723:0] info: response for 210236163162dns.com. NS IN
[1453686400] unbound[1723:0] info: reply from <210236163162dns.com.> 64.31.42.226#53
[1453686400] unbound[1723:0] info: query response was nodata ANSWER