Robtex

Up: 203.253.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 203.253.240.0/22
Down right: 203.253.244.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.253.244.20	A+PTR	ftp.kbsi.re.kr
203.253.244.20	A+PTR	ns2.kbsi.re.kr
203.253.244.50	A+PTR	ns.kbsi.re.kr
203.253.244.70	A	xscience.kbsi.re.kr
203.253.244.100	A+PTR	smtp.kbsi.re.kr
203.253.244.100	A+PTR	spamx.kbsi.re.kr
203.253.244.110	A+PTR	mail.kbsi.re.kr
203.253.244.110	A+PTR	webmail.kbsi.re.kr
203.253.244.123	A+PTR	nfec.go.kr
203.253.244.123	PTR	brain.nfec.go.kr
203.253.244.123	A+PTR	feel.nfec.go.kr
203.253.244.150	PTR	busan.kbsi.re.kr
203.253.244.150	PTR	hvem.kbsi.re.kr
203.253.244.150	A+PTR	ics.kbsi.re.kr
203.253.244.170	A+PTR	tuse.kbsi.re.kr
203.253.244.170	PTR	testuse.kbsi.re.kr
203.253.244.170	PTR	oplab.kbsi.re.kr
203.253.244.200	PTR	ics2.kbsi.re.kr
203.253.244.200	PTR	ocs2.kbsi.re.kr
203.253.244.200	PTR	shrimp2.kbsi.re.kr
203.253.245.12	A	gw.kbsi.re.kr
203.253.245.108	A	sms.kbsi.re.kr