Robtex

Up: 203.251.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 203.251.0.0/19
Down right: 203.251.32.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.251.1.3	PTR	apollon.krs.co.kr
203.251.1.6	PTR	mail.krs.co.kr
203.251.1.126	A	soyangjae.com
203.251.4.188	A	powerbiz.kr
203.251.4.190	A	corebiz.co.kr
203.251.5.1	PTR	bbs.mynet.co.kr
203.251.5.2	PTR	mud.mynet.co.kr
203.251.8.1	PTR	ez.ez.co.kr
203.251.11.116	A	www.jeju-showcase.com
203.251.12.251	PTR	oreum.com
203.251.16.254	PTR	taejun-cent2-eth00.kornet.nm.kr
203.251.17.63	PTR	taejun-c2511-4-po3.kornet.nm.kr
203.251.21.1	A+PTR	mail.hcc.co.kr
203.251.21.1	A	mail.e-hcc.com
203.251.21.1	A	ns.hcc.co.kr
203.251.21.2	A	spam.hcc.co.kr
203.251.21.4	PTR	hvccglobal.com
203.251.24.1	A+PTR	ns.mirae.com
203.251.24.1	PTR	ns.mirae.net
203.251.24.1	PTR	ns1.mirae.net
203.251.24.2	PTR	mirae.com
203.251.24.2	PTR	mirae.co.kr
203.251.24.3	PTR	pop.mirae.com
203.251.24.3	PTR	pop.mirae.co.kr
203.251.30.201	PTR	t1-daejun-center1-s1-1.kornet.nm.kr
203.251.34.222	PTR	75fddi14-chungju.kornet.net
203.251.37.5	PTR	cbcenter.kornet.nm.kr
203.251.40.2	PTR	junju-pc-1.kornet.nm.kr
203.251.41.1	PTR	jj-r1-ge0.kornet.net
203.251.42.190	PTR	junju-center7000-e04.kornet.nm.kr
203.251.44.21	A	joonseo.net
203.251.44.21	A	postmaster.joonseo.net
203.251.44.105	A	tjp.co.kr
203.251.45.66	A	ocip3.com
203.251.48.4	PTR	host.cline.co.kr
203.251.48.150	PTR	kwangju-cs-4.kornet.nm.kr
203.251.53.188	PTR	one.or.kr
203.251.57.131	A	www.kbicl.co.kr
203.251.60.107	A	ns.kjbfg.com
203.251.60.107	A	ns.kjbank.com
203.251.60.107	A	ns.kjbank.co.kr
203.251.60.108	A	ns2.kjbank.co.kr
203.251.60.229	A	mail.kjbank.co.kr
203.251.60.229	A	glb1.kjbank.com
203.251.60.232	A	kjbank.co.kr
203.251.60.232	A	www.kjbank.com
203.251.62.65	PTR	munhung-m.ed.kwangju.kr