Robtex

Up: 203.255.224.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 203.255.240.0/21
Down right: 203.255.248.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.255.241.4	A+PTR	ns1.sicc.co.kr
203.255.241.4	A	ns1.sicc.kr
203.255.241.5	A+PTR	ns2.sicc.co.kr
203.255.241.5	A	ns2.sicc.kr
203.255.241.6	PTR	spam.sicc.co.kr
203.255.241.7	PTR	mail.sicc.co.kr
203.255.241.16	A+PTR	ctas.sicc.co.kr
203.255.241.25	A	icfr.sicc.co.kr
203.255.241.28	A	recruit.sicc.co.kr
203.255.241.29	A	virus.sicc.co.kr
203.255.241.31	A	recruit.sicc.co.kr
203.255.241.33	PTR	tttt.sicc.co.kr
203.255.241.33	A	pms.sicc.co.kr
203.255.241.52	A	cims.sicc.co.kr
203.255.241.153	A	www.ssit.co.kr
203.255.241.190	A	sports.sicc.co.kr
203.255.241.190	A	siccsports.com
203.255.242.11	A+PTR	mis.sicc.co.kr
203.255.242.12	A+PTR	miswas.sicc.co.kr
203.255.242.16	A	card.sicc.co.kr
203.255.242.21	A+PTR	edms.sicc.co.kr
203.255.242.22	A+PTR	search.sicc.co.kr
203.255.242.242	A	cucms.sicc.co.kr
203.255.242.243	PTR	cups.sicc.co.kr
203.255.242.244	PTR	cumpe.sicc.co.kr
203.255.242.247	A	ldap.sicc.co.kr
203.255.242.248	A	cuc.sicc.co.kr
203.255.248.18	A	ns.geneline.co.kr
203.255.248.18	A	nownteck.com
203.255.248.18	A	ns.linksensor.net
203.255.248.50	A	noc6.koren21.net
203.255.248.51	A	noc.koren21.net
203.255.248.51	A	ns.koren21.net
203.255.248.51	A	anf.ne.kr
203.255.249.51	PTR	ns.koren21.net
203.255.249.52	PTR	ns2.koren21.net
203.255.250.101	A+PTR	ns1.koren.kr
203.255.250.101	PTR	mx2.koren.kr
203.255.250.101	A	ns2.korennoc.kr
203.255.250.102	A	ns2.korennoc.kr
203.255.250.102	A	ns2.koren.kr
203.255.250.103	A+PTR	ns2.koren.kr
203.255.250.103	A	mx.koren.kr
203.255.250.113	A	mx3.koren.kr
203.255.250.123	A+PTR	mx2.koren.kr
203.255.250.173	A	uglsoft.com
203.255.251.49	A	ns2.geoplace.org
203.255.251.49	A	insightar.org
203.255.251.51	PTR	ns.koren21.net
203.255.251.52	PTR	ns2.koren21.net
203.255.252.51	PTR	ns.koren21.net
203.255.252.52	PTR	ns2.koren21.net
203.255.252.98	A	vc.koren.kr
203.255.252.99	A	vc.koren.kr
203.255.252.158	A	asmbluewave.com
203.255.252.196	A	kesg-daegu.koren21.net
203.255.252.203	A	mobileappstudio.net
203.255.253.51	PTR	ns.koren21.net
203.255.253.51	PTR	ns2.koren21.net
203.255.254.2	A	www.geneline.co.kr
203.255.254.2	A	www.net-bridge.com
203.255.254.2	A	net-bridge.com
203.255.254.51	PTR	ns.koren21.net
203.255.254.52	PTR	ns2.koren21.net
203.255.255.51	PTR	ns.koren21.net
203.255.255.52	PTR	ns2.koren21.net