go
c.dns.kr has one IP number , but the reverse is kr2ld.bora.net. kr2ld.bora.net point to the same IP. pe.kr, ne.kr, es.kr, sc.kr, re.kr and at least 100 other hosts use this as a nameserver. dns.kr is a domain controlled by six nameservers at dns.kr themselves. All of them are on different IP networks. c.dns.kr is hosted on a server in Korea.

c.dns.kr
a records
 
+ 203.248.246.220 203.248.128.0/17 AS3786 kr2ld.bora.net
+ --- kr2ld.bora.net

dns.kr
ns-soa records
g.dns.kr
+ 202.31.190.1 202.31.190.0/24 AS23600 -
+ --- -
ns records
b.dns.kr
+ 61.74.75.1 61.72.0.0/13 AS4766  
+ ---  
c.dns.kr
+ 203.248.246.220 203.248.128.0/17 AS3786 kr2ld.bora.net
+ --- kr2ld.bora.net
d.dns.kr
+ 203.83.159.1 203.83.159.0/24 AS23599  
+ ---  
e.dns.kr
+ 202.30.124.100 202.30.124.0/24 AS23596 -
+ --- -
f.dns.kr
+ 218.38.181.90 218.38.0.0/15 AS9318  
+ ---  
g.dns.kr
+ 202.31.190.1 202.31.190.0/24 AS23600 -
+ --- -
ip numbers of host
203.248.246.220
ptrs of ip numbers
kr2ld.bora.net
ip numbers using ptr to this host
203.248.240.141
hostnames sharing ip with a-records
kr2ld.bora.net
domains using this as nameserver
1.59.in-addr.arpa
100.61.in-addr.arpa
103.61.in-addr.arpa
105.210.in-addr.arpa
105.211.in-addr.arpa
106.211.in-addr.arpa
106.61.in-addr.arpa
107.211.in-addr.arpa
108.222.in-addr.arpa
109.210.in-addr.arpa
109.61.in-addr.arpa
115.211.in-addr.arpa
116.210.in-addr.arpa
118.210.in-addr.arpa
122.222.in-addr.arpa
123.210.in-addr.arpa
126.168.in-addr.arpa
132.121.in-addr.arpa
139.221.in-addr.arpa
143.221.in-addr.arpa
145.218.in-addr.arpa
150.218.in-addr.arpa
150.59.in-addr.arpa
172.211.in-addr.arpa
174.211.in-addr.arpa
186.59.in-addr.arpa
187.59.in-addr.arpa
189.211.in-addr.arpa
19.59.in-addr.arpa
196.60.in-addr.arpa
198.211.in-addr.arpa
202.211.in-addr.arpa
205.210.in-addr.arpa
216.211.in-addr.arpa
221.210.in-addr.arpa
227.58.in-addr.arpa
230.220.in-addr.arpa
232.203.in-addr.arpa
232.218.in-addr.arpa
232.58.in-addr.arpa
233.203.in-addr.arpa
233.211.in-addr.arpa
234.211.in-addr.arpa
234.222.in-addr.arpa
235.203.in-addr.arpa
236.203.in-addr.arpa
237.222.in-addr.arpa
238.203.in-addr.arpa
238.222.in-addr.arpa
239.211.in-addr.arpa
239.222.in-addr.arpa
240.219.in-addr.arpa
246.203.in-addr.arpa
246.211.in-addr.arpa
248.203.in-addr.arpa
249.203.in-addr.arpa
25.59.in-addr.arpa
250.203.in-addr.arpa
250.61.in-addr.arpa
251.203.in-addr.arpa
252.203.in-addr.arpa
254.203.in-addr.arpa
254.211.in-addr.arpa
254.219.in-addr.arpa
255.203.in-addr.arpa
29.58.in-addr.arpa
30.202.in-addr.arpa
31.202.in-addr.arpa
33.211.in-addr.arpa
36.218.in-addr.arpa
38.218.in-addr.arpa
39.211.in-addr.arpa
41.211.in-addr.arpa
45.211.in-addr.arpa
47.211.in-addr.arpa
48.211.in-addr.arpa
51.211.in-addr.arpa
55.211.in-addr.arpa
58.211.in-addr.arpa
6.59.in-addr.arpa
62.211.in-addr.arpa
63.211.in-addr.arpa
65.121.in-addr.arpa
71.220.in-addr.arpa
72.61.in-addr.arpa
73.220.in-addr.arpa
74.61.in-addr.arpa
78.61.in-addr.arpa
80.61.in-addr.arpa
85.220.in-addr.arpa
91.210.in-addr.arpa
92.210.in-addr.arpa
92.220.in-addr.arpa
94.210.in-addr.arpa
95.220.in-addr.arpa
97.61.in-addr.arpa
99.152.in-addr.arpa
99.210.in-addr.arpa
ac.kr
busan.kr
co.kr
daegu.kr
daejeon.kr
dns.kr
es.kr
gangwon.kr
go.kr
gyeongbuk.kr
gyeongnam.kr
jeonbuk.kr
jeonnam.kr
ms.kr
ne.kr
or.kr
pe.kr
re.kr
sc.kr
seoul.kr
ulsan.kr
used as nameserver but missing in zone
118.60.in-addr.arpa
160.112.in-addr.arpa
171.112.in-addr.arpa
70.119.in-addr.arpa
88.115.in-addr.arpa
90.115.in-addr.arpa