Robtex

Up: 211.191.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 211.191.64.0/20
Down right: 211.191.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.191.85.31	A	mail.bosung21.com
211.191.85.31	A	mail.hycorp.co.kr
211.191.85.31	A	mail.bosungleisure.com
211.191.85.41	A	spam.hanyangcorp.co.kr
211.191.85.41	A	spam.bosungleisure.com
211.191.85.41	A	spam.nscity.co.kr