Robtex

Up: 221.136.0.0/14
Can't show all results, try to descend to a more specific CIDR
Down left: 221.138.0.0/16
Down right: 221.139.0.0/16
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.138.11.238	A	ansrl90.synology.me
221.138.11.238	A	www.ansrl90.synology.me
221.138.16.146	A	hekefu.com
221.138.17.146	A	ns.0solution.net
221.138.17.146	A	root.0solution.net
221.138.17.146	A	ns.0nara.net
221.138.35.85	A	hpkorea.net
221.138.36.14	A	joonee.com
221.138.51.35	A	cloud.dobob.kr
221.138.51.186	A	www.videostudio.co.kr
221.138.51.186	A	videostudio.co.kr
221.138.97.181	A	www.05668.com
221.138.102.240	A	cult21.com
221.138.106.141	A	mail.nocr.net
221.138.148.87	A	falldown.myqnapcloud.com
221.138.162.248	A	www.kleaguearchive.com
221.138.162.248	A	kleaguearchive.com
221.138.165.53	A	www.carroty.synology.me
221.138.169.141	A	wsp.co.kr
221.138.169.141	A	vivakr.com
221.138.169.141	A	www.wsp.co.kr
221.138.184.193	A	way2java.net
221.138.204.246	A	atkynk.com
221.138.206.137	A	zcube.kr
221.138.206.137	A	*.zcube.kr
221.138.222.216	A	godqhrdnd.com
221.138.227.89	A	elcu.me
221.138.234.222	A	sungho.kim
221.138.236.202	A	mail.tmoncorp.com
221.138.236.203	PTR	mail.tmoncorp.com
221.138.236.204	PTR	mail2.tmoncorp.com
221.138.236.204	A	tmonmail2.tmoncorp.com
221.138.236.247	A	ns2.tmoncorp.com
221.138.240.80	A	exodusflying.com
221.138.242.154	A	ashindev.com
221.138.252.93	PTR	mail.heber.co.kr
221.138.252.93	A	heber.co.kr
221.138.252.104	A	suncar.kr
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
221.139.2.6	A	www.hiphopbug.com
221.139.2.6	A	jintax.com
221.139.2.6	A	www.encube.net
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
221.139.16.231	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
221.139.50.3	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
221.139.63.1	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
221.139.107.40	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