Robtex

Up: 203.255.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 203.255.248.0/22
Down right: 203.255.252.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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
203.255.248.61	A	bfbi.net
203.255.248.61	A	www.bfbi.net
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