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.