Robtex

Up: 221.138.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 221.139.0.0/17
Down right: 221.139.128.0/17
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.139.0.6	A	vwall.markins.com
221.139.0.6	A	vwall.smcair.com
221.139.0.6	A	vwall.han-young.com
221.139.1.10	A	ns1.infonex.co.kr
221.139.1.11	A	ns2.infonex.co.kr
221.139.1.13	A	infonex.co.kr
221.139.1.14	A	www.nexpc.co.kr
221.139.2.6	A	www.hiphopbug.com
221.139.2.6	A	jintax.com
221.139.2.6	A	www.encube.net
221.139.3.2	A	mail.piuri.net
221.139.3.2	A	www.piuri.com
221.139.3.2	A	piuri.com
221.139.3.3	A	sooffice.co.kr
221.139.13.130	PTR	cns2.hananet.net
221.139.13.130	A	ns2.add.re.kr
221.139.13.133	PTR	cns202.hananet.net
221.139.14.70	A	mail.bohumbigyo.com
221.139.14.70	A	mail.bohum1.com
221.139.14.70	A	ns1.bohum1.com
221.139.14.72	PTR	mailscanner.lpcs.co.kr
221.139.14.72	A	mailscanner.e-seetech.com
221.139.14.91	A	mail.bohum1.com
221.139.15.243	A	jjumdol.com
221.139.16.231	A	www.nsdoc.com
221.139.16.231	A	nsdoc.com
221.139.18.241	A	sikdan.today
221.139.30.35	A	chocotree.co.kr
221.139.32.62	A	mirimlab.myds.me
221.139.32.62	A	www.mirimlab.myds.me
221.139.34.210	A	happyfoto.co.kr
221.139.40.174	A	mail.pet-ban5dit-burst.xyz
221.139.48.10	A	ns3.cdnlab.com
221.139.48.62	A	ragnaweb.nefficient.co.kr
221.139.48.71	A	csmg.lgmobile.com.krcac.nefficient.co.kr
221.139.48.72	A	ns1.cashcondist.com
221.139.49.3	A	www.humanwr.com
221.139.49.3	A	mail.tansanpick.com
221.139.49.3	A	upipsc.com
221.139.50.3	A	mail.touchpia.net
221.139.50.4	A	f-defender.com
221.139.50.8	A	bmkorea.co.kr
221.139.50.8	A	www.bmkorea.co.kr
221.139.50.9	PTR	mail.gtgsc.com
221.139.50.9	PTR	mail.gtgsc.co.kr
221.139.51.131	A	ns.tourexpress.com
221.139.51.133	A	mail0.tourexpress.com
221.139.51.142	A	anti0.tourexpress.com
221.139.51.144	A	mail.btnikorea.com
221.139.63.1	A	kyoboaxa-im.com
221.139.63.1	A	kyoboaxa-im.co.kr
221.139.63.1	A	ns.kyoboaxa-im.co.kr
221.139.63.211	PTR	gw.kyoboaxa-im.co.kr
221.139.85.138	A	www.instamate.co.kr
221.139.85.138	A	kjinstory.com
221.139.85.138	A	insta1k.com
221.139.104.3	A	3jaloe.co.kr
221.139.104.3	A	greencos.co.kr
221.139.104.5	A	go1005car.com
221.139.104.5	A	tomatogame.net
221.139.104.80	A	pruna.cachenet.com
221.139.105.25	A	whitemochi.com
221.139.105.35	A	fs.gametree.co.kr
221.139.105.141	A	www.unitedfutureparty.kr
221.139.105.141	A	www.saenuriparty.kr
221.139.107.40	A	livescore00.com
221.139.107.42	A	pruna.cachenet.com
221.139.107.110	A	mail.psynet.co.kr
221.139.107.111	A	mail.hithere.co.kr
221.139.107.227	A	pruna.cachenet.com
221.139.108.164	A	10690239.com
221.139.108.194	A+PTR	ns2.hananet.net
221.139.108.194	A	ns2.dtpia.com
221.139.108.194	A	ns2.dtpia.co.kr
221.139.108.196	PTR	ins2.hananet.net
221.139.110.132	A	iwoons.net
221.139.120.65	A	seouchoi.com
221.139.120.65	A	womsean.com
221.139.152.148	A	synkdp.pe.kr
221.139.152.197	A	www.synkdp.pe.kr
221.139.180.233	A	omomo.com
221.139.185.41	A	thessun.com
221.139.185.41	A	duwoon.com
221.139.189.109	A	local.philstar.biz
221.139.189.154	A	smtp.msetrade.net
221.139.189.154	A	msetrade.net
221.139.190.73	A+PTR	mail.leaderschem.com
221.139.190.73	PTR	mail.leaderschem.kr
221.139.190.73	PTR	mail2.dongoh.co.kr
221.139.190.74	PTR	spam.dongoh.co.kr
221.139.193.37	A	uchani.net
221.139.197.16	A	spam.kinfra.co.kr
221.139.197.210	A	www.liveplex.co.kr
221.139.197.210	A	liveplex.co.kr
221.139.197.249	A	mail.bitcash.com
221.139.198.162	PTR	mail.irt.co.kr
221.139.198.162	A	www.irt.co.kr
221.139.198.162	A	irt.co.kr
221.139.198.164	A	dukyunwave.com
221.139.199.206	A	ybdlinternational.net
221.139.213.23	A	mail.goduk3apt.com
221.139.218.100	A	megacody.com
221.139.218.100	A	mdepart.com
221.139.218.100	A	etwells.com
221.139.240.36	A	www.dodami.net
221.139.240.36	A	dodami.synology.me
221.139.242.164	A	hyunwoong.kim
221.139.253.34	A	mx1.chemres.com.ph
221.139.253.34	A	mx2.chemres.com.ph
221.139.253.34	A	mail.chemres.com.ph
221.139.253.36	A	jasper.com.ph