Robtex

Up: 203.251.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 203.251.0.0/18
Down right: 203.251.64.0/18
(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
203.251.34.222	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
203.251.68.1	PTR	pohangexpo.kornet.nm.kr
203.251.68.136	A+PTR	group.khvatec.com
203.251.68.136	A	group.khlitec.com
203.251.68.136	A	group.kheltec.com
203.251.70.53	A	arotg.kr
203.251.73.6	A+PTR	daedong.co.kr
203.251.73.6	A+PTR	utv.daedong.co.kr
203.251.73.6	A	xn--ob0bp8ivsaf07c.com
203.251.73.244	A	demss.co.kr
203.251.73.252	A	coddi.co.kr
203.251.73.252	A	coddi.com
203.251.75.34	PTR	idealsys.co.kr
203.251.78.130	PTR	emile.co.kr
203.251.78.209	PTR	taegu-kix-c7513-7.kornet.nm.kr
203.251.79.137	A	www.djgeopharm.com
203.251.79.137	A	www.geo-pharm.com
203.251.79.137	A	geo-pharm.com
203.251.80.1	PTR	taegu-cs-1.kornet.nm.kr
203.251.80.12	A	mail.1ma.co.kr
203.251.80.15	A	ns1.totalleisureone.co.kr
203.251.80.15	A	mail.qaz.co.kr
203.251.80.15	A	gunsuri.co.kr
203.251.80.131	A	kongmasil.com
203.251.80.131	A	mail.hukma.co.kr
203.251.80.131	A	1004plus.com
203.251.81.3	A	kpolice.com
203.251.81.3	A	dgkodari.com
203.251.81.4	A	ns1.e-sens.co.kr
203.251.81.5	A	www.cpsfestival.org
203.251.81.148	A	dcsite.co.kr
203.251.81.151	A	mail.caravean.com
203.251.81.151	A	eunjinps.com
203.251.81.151	A	mail.gwweb.co.kr
203.251.82.30	PTR	dg-r1-ge0.kornet.net
203.251.82.31	PTR	dg-r2-ge0.kornet.net
203.251.83.210	A	www.kb-one.co.kr
203.251.83.210	A	kb-one.co.kr
203.251.83.210	A	toolstec.com
203.251.86.238	A	naon.pe.kr
203.251.87.4	A	mail.m2000.co.kr
203.251.87.90	A+PTR	mail.imaeil.com
203.251.91.3	PTR	mail2.tbc.co.kr
203.251.91.3	A	mx2.tbc.co.kr
203.251.91.8	A	www.ikbc.co.kr
203.251.91.12	A	www.ikbc.co.kr
203.251.91.12	A	ikbc.co.kr
203.251.91.15	A	dibf.co.kr
203.251.93.5	PTR	mail.tc.co.kr
203.251.96.1	A	www.dongil.co.kr
203.251.96.1	A	dongil.co.kr
203.251.98.29	PTR	bs-r2-my-r1-s45.kornet.net
203.251.104.5	PTR	mail.saracom.net
203.251.106.201	A	bytl-bs.com
203.251.109.196	A	gswebtoon.com
203.251.109.196	A	letsgogb.com
203.251.109.225	A	kimkwanyong1.com
203.251.109.225	A	novasvc.co.kr
203.251.110.205	PTR	sl-phohang-s1-0.kornet.nm.kr
203.251.112.104	A	ns1.bjc.ac.kr
203.251.112.104	A	bjc.ac.kr
203.251.112.104	A	ns2.bpu.ac.kr
203.251.112.110	A	mail.bpu.ac.kr
203.251.112.113	A	bjc.ac.kr
203.251.114.100	A	www.ktman.pe.kr
203.251.115.4	PTR	www2.shiplink.co.kr
203.251.115.9	A+PTR	mail.wjwp.co.kr
203.251.115.11	A	sniper.shindong.com
203.251.115.29	A	ns.kseg.co.kr
203.251.115.29	A	ns.kse3g.com
203.251.121.72	A	www.phoenixit.co.kr
203.251.121.72	A	phoenixit.co.kr
203.251.121.90	A	www.kcsgo.com
203.251.122.22	A	www.grandhotel.co.kr
203.251.122.27	PTR	grandhotel.co.kr
203.251.125.2	PTR	kisco.kwangil.co.kr
203.251.125.4	PTR	www.samjung.co.kr
203.251.125.7	PTR	sinby.com.co.kr