Robtex

Up: 210.121.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 210.121.192.0/19
Down right: 210.121.224.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.121.195.95	PTR	ns1.holywar.net
210.121.195.97	PTR	ns2.holywar.net
210.121.196.10	A	www.hwacheon.co.kr
210.121.196.10	A	hwacheon.com
210.121.196.10	A	spamkiller.hwacheon.com
210.121.197.3	PTR	hwacheon.co.kr
210.121.197.11	A+PTR	spamcop.hwacheon.com
210.121.197.11	A+PTR	spamcop.hwacheon.co.kr
210.121.197.13	A+PTR	seoul.hwacheon.com
210.121.197.13	A+PTR	seoul.hwacheon.co.kr
210.121.197.65	A	m.menet.co.kr
210.121.201.1	PTR	cu.co.kr
210.121.201.2	PTR	mail.cu.co.kr
210.121.201.5	A	ns1.cu.co.kr
210.121.201.6	A	ns2.cu.co.kr
210.121.201.15	A	cu.co.kr
210.121.201.25	A	www.cu.co.kr
210.121.201.30	A	cu.co.kr
210.121.203.50	A	cnameimage.fmkorea.com
210.121.203.51	A	cnameproxy.fmkorea.com
210.121.204.8	A	mail.dstoolpia.com
210.121.204.8	A	mail.dstoolpia.co.kr
210.121.204.8	A	mail.dstts.com
210.121.204.84	A	dajeong-tools.com
210.121.204.84	A	kpostb2b.com
210.121.204.217	A	mail.dsttm.com
210.121.210.14	A	mail.vballey.com
210.121.210.14	A	vballey.com
210.121.210.21	A	www.arcline.co.kr
210.121.210.44	A	malwareanalysis.co.kr
210.121.210.200	PTR	truscom.com
210.121.212.129	A+PTR	ns.aiak.or.kr
210.121.212.137	A	www.aiak.or.kr
210.121.212.137	A	aiak.or.kr
210.121.212.139	A	mail.aiak.or.kr
210.121.219.29	A	ns.pcakorea.co.kr
210.121.219.30	A	ns2.pcakorea.co.kr
210.121.219.31	PTR	www.pcakorea.co.kr
210.121.219.31	A	pcakorea.co.kr
210.121.219.34	A	mail.pcakorea.co.kr
210.121.219.48	A	pcaconnect.co.kr
210.121.219.71	A	pcaconnect.co.kr
210.121.221.125	PTR	sj.co.kr
210.121.221.126	PTR	mail.sj.co.kr
210.121.222.73	PTR	hcp.co.kr
210.121.223.2	A	email.studiojdd.com
210.121.229.1	A	ns.ptu.ac.kr
210.121.229.3	A+PTR	sniper.ptu.ac.kr
210.121.229.3	A+PTR	sniper.ptuniv.ac.kr
210.121.229.9	PTR	mail.ptu.ac.kr
210.121.229.9	PTR	mail.ptuniv.ac.kr
210.121.229.9	A	ptuniv.ac.kr
210.121.231.1	PTR	kivta.or.kr
210.121.238.3	A	mail.jaiel.co.kr
210.121.238.5	A	environ2000.co.kr
210.121.238.5	A	www.osang.com
210.121.238.5	A	osangjaiel.com
210.121.238.111	A	mail.jaiel.co.kr
210.121.242.14	PTR	www.soyang.co.kr
210.121.242.227	PTR	kwrd.or.kr
210.121.243.1	A	ns.bflysoft.co.kr
210.121.243.1	A	ns.bflysoft.com
210.121.243.2	PTR	multi.songsu-gch.ed.kangwon.kr
210.121.243.2	A	mail.bflysoft.kr
210.121.243.43	A	group.bflysoft.kr
210.121.245.50	PTR	kdri.re.kr
210.121.246.2	PTR	h2o.co.kr