Robtex

Up: 211.42.30.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 211.42.31.0/25
Down right: 211.42.31.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.42.31.11	A	mailx.kocca.kr
211.42.31.11	A	mail.kbi.re.kr
211.42.31.11	A	mailx.kocca.or.kr
211.42.31.36	A	mail.kocca.or.kr
211.42.31.37	A	kmsmsn.kocca.or.kr
211.42.31.37	A	webmail.kocca.kr
211.42.31.37	A	webmail.kocca.or.kr