Robtex

Up: 121.88.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 121.88.4.0/23
Down right: 121.88.6.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.88.4.2	A	ns1.tidc.co.kr
121.88.4.2	A	ns.dongshin.or.kr
121.88.4.11	A	m-web.co.kr
121.88.4.19	A	bienair.co.kr
121.88.4.19	A	thezonshop.com
121.88.4.19	A	mail.thezonshop.com
121.88.4.21	A	mail.udtech.co.kr
121.88.4.23	A	jjtc.co.kr
121.88.4.25	A	www.s-cure.co.kr
121.88.4.25	A	skt.co.kr
121.88.4.25	A	udtech.co.kr
121.88.4.28	A	mail.uriminzokkkiri.com
121.88.4.30	A	mail.cestalkingclass.co.kr
121.88.4.30	A	cestalkingclass.co.kr
121.88.4.36	A	ynwtuukf.net
121.88.4.38	A	unioneinm.com
121.88.4.39	A	for.gobest.co.kr
121.88.4.39	A	gobestsite.co.kr
121.88.4.40	A	bitsol.kr
121.88.4.40	A	hanulad.com
121.88.4.40	A	www.bitsol.kr
121.88.4.48	A	lovermake.net
121.88.4.48	A	lovermake.co.kr
121.88.4.48	A	everyting.co.kr
121.88.4.68	A	bestist.net
121.88.4.75	A	mail.aprosound.com
121.88.4.75	A	ns.wizemdesign.com
121.88.4.75	A	mail.myopen.kr
121.88.4.78	A	mail.xn--vk1b05ihtaj7koxdo6dp2ggyb782b6hixxi.com
121.88.4.81	A	edumain.net
121.88.4.85	A	makeunse.com
121.88.4.85	A	www.fortune-i.co.kr
121.88.4.85	A	fortune-i.co.kr
121.88.4.97	A	ns2.jexcube.com
121.88.4.97	A	e-jodal.com
121.88.4.97	A	shinsungmedia.com
121.88.4.99	A	ns2.forbiznet.kr
121.88.4.121	A	kcimember.or.kr
121.88.4.141	A	anb21.com
121.88.5.10	A	root.diskstory.com
121.88.5.10	A	ns.diskstory.com
121.88.5.10	A	ns2.diskstory.com
121.88.5.15	A	wisenwide.com
121.88.5.15	A	ns.wisenwide.com
121.88.5.18	A	ns.wisenwide.com
121.88.5.74	A	forbiznet.kr
121.88.5.74	A	ns1.forbiznet.kr
121.88.5.74	A	www.forbiznet.kr
121.88.5.82	A	hanpangame.com
121.88.5.83	A	www.day7.co.kr
121.88.5.92	A	adspace.co.kr
121.88.5.92	A	wall1paper.com
121.88.5.94	A	*.kbsmall.net
121.88.5.94	A	mail.kbsmall.net
121.88.5.98	A	yadong19.com
121.88.5.98	A	love79.tv
121.88.5.98	A	call79.com
121.88.5.115	A+PTR	mail.dmgec.com
121.88.5.115	A+PTR	mail.dmgec.co.kr
121.88.5.115	A	webmail.dmgec.co.kr
121.88.5.116	A	spamout.dmgec.com
121.88.5.116	A	spamout.dmgec.co.kr
121.88.5.121	A	www.myjungwoo.com
121.88.5.121	A	30.00ok.kr
121.88.5.121	A	www.happych.co.kr
121.88.5.124	A	rugmarket.co.kr
121.88.5.124	A	mclean.co.kr
121.88.5.132	PTR	g2i.tidc.co.kr
121.88.5.132	A	www.cs4smb.or.kr
121.88.5.132	A	www.g-story.or.kr
121.88.5.136	A	mail.jejupic.com
121.88.5.136	A	skindata.co.kr
121.88.5.136	A	ns2.mytive.co.kr
121.88.5.140	A	mylanguage.co.kr
121.88.5.140	A	mail.imgoya.com
121.88.5.140	A	www.imgoya.com
121.88.5.144	A	04recipe.com
121.88.5.144	A	www.getin.kr
121.88.5.144	A	mail.04recipe.com
121.88.5.148	A	shrink1st.org
121.88.5.148	A	*.lcomms.com
121.88.5.148	A	fonsign.com
121.88.5.152	A	mail.insurancesupport.or.kr
121.88.5.152	A	insurancesupport.or.kr
121.88.5.155	A	oscompany.co.kr
121.88.5.155	A	www.kiwoombank.com
121.88.5.164	A	ns.howtoteps.com
121.88.5.164	A	ns.nexusteps.com
121.88.5.164	A	ns.nexuson.com
121.88.5.171	A	fafreeka.com
121.88.5.171	A	mail.red3838.com
121.88.5.171	A	red3838.com
121.88.5.173	A	ektc.kr
121.88.5.173	A	www.ektc.kr
121.88.5.175	A	go-pole.co.kr
121.88.5.175	A	phmeter.co.kr
121.88.5.176	A	idaeshin.biz
121.88.5.176	A	mail.eilshin.biz
121.88.5.176	A	ns.idaeshin.biz
121.88.5.181	A	*.jam-dns.com
121.88.5.181	A	howtoteps.com
121.88.5.181	A	*.nexusgo.net
121.88.5.184	A	xn--oy2b1l49r08of1c.com
121.88.5.184	A	mail.adiscountcard.com
121.88.5.184	A	wordpresso.co.kr
121.88.5.188	A	smartautoscan.com
121.88.5.238	A	mycashbag.com
121.88.5.240	A+PTR	mail.naunbiz.co.kr
121.88.5.240	A	www.naunbiz.co.kr
121.88.5.240	A	naunbiz.co.kr
121.88.5.241	A	call888.net
121.88.5.247	A	myfirstaac.com
121.88.6.56	A	wiki.narics.net
121.88.6.145	PTR	spam.namusoft.kr
121.88.6.145	PTR	spam.rentsoft.co.kr
121.88.6.146	PTR	mail.namusoft.kr
121.88.6.146	PTR	mail.estorm.co.kr
121.88.6.146	PTR	webmail.omad.co.kr
121.88.6.151	PTR	mail.elkedu.com
121.88.6.151	PTR	mail.mono-sys.com
121.88.6.151	PTR	mail.pishon-tech.com
121.88.6.152	A	ekoreasystem.com
121.88.6.161	PTR	maritimefoundation.or.kr
121.88.6.164	PTR	estorm.jp
121.88.6.164	PTR	mail.get27.com
121.88.6.164	PTR	mail.rentsoft.co.kr
121.88.7.125	A	happycj.net
121.88.7.175	A	mail.2019svc.com