Robtex

Up: 211.50.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 211.50.0.0/18
Down right: 211.50.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.50.3.6	PTR	anyaba77-s4-0-6-c.rt.bora.net
211.50.3.206	PTR	knmcba25-s5-5-9-c.rt.bora.net
211.50.4.76	PTR	mugonghae.com
211.50.4.76	PTR	ftp.mugonghae.com
211.50.4.76	PTR	mail.mugonghae.com
211.50.8.90	A	bonoby.org
211.50.8.203	PTR	mesian.co.kr
211.50.8.203	PTR	ftp.mesian.co.kr
211.50.8.203	PTR	mail.mesian.co.kr
211.50.11.2	PTR	atos.co.kr
211.50.11.2	PTR	mail.atos.co.kr
211.50.11.3	PTR	mbc-donga.com
211.50.11.3	PTR	naonacademy.com
211.50.11.3	PTR	naoncamp.com
211.50.14.61	PTR	matst.com
211.50.14.61	PTR	netsone.com
211.50.14.61	PTR	netsone.net
211.50.14.131	PTR	ns1.yesnic.com
211.50.14.132	PTR	ns2.yesnic.com
211.50.14.133	PTR	ns3.yesnic.com
211.50.14.134	PTR	ns4.yesnic.com
211.50.18.3	A	webpos.columbia.com
211.50.19.0	A	adigm.co.kr
211.50.19.67	A+PTR	mail.fashionplus.co.kr
211.50.19.67	PTR	mail.ifnetwork.co.kr
211.50.19.67	PTR	mail.ifp.co.kr
211.50.21.2	PTR	industrader.com
211.50.21.2	PTR	ftp.industrader.com
211.50.21.2	PTR	telnet.industrader.com
211.50.21.4	PTR	mail.industrader.com
211.50.21.4	PTR	ebizeye.co.kr
211.50.21.4	PTR	mail.ebizeye.co.kr
211.50.21.66	PTR	conveyor.co.kr
211.50.21.66	PTR	ftp.conveyor.co.kr
211.50.21.66	PTR	mail.conveyor.co.kr
211.50.23.194	PTR	ajintech.com
211.50.23.194	PTR	ajintechline.com
211.50.23.194	PTR	ftp.ajintech.com
211.50.24.2	A	ssl.biemt.co.kr
211.50.24.3	PTR	biemt.com
211.50.24.3	A+PTR	biemt.co.kr
211.50.24.3	A+PTR	www.biemt.co.kr
211.50.24.4	PTR	spam.biemt.co.kr
211.50.24.5	PTR	gw.biemt.co.kr
211.50.24.5	PTR	m.biemt.co.kr
211.50.29.130	PTR	mail.3ssystem.com
211.50.29.130	PTR	mail.3ssystem.co.kr
211.50.29.130	A	www.youngan.co.kr
211.50.29.140	A+PTR	mail.youngan.co.kr
211.50.33.161	A	www.as5.co.kr
211.50.38.12	A	ntit.co.kr
211.50.38.13	A	uspe.co.kr
211.50.38.18	A	pe.or.kr
211.50.38.19	A	ktei.co.kr
211.50.49.10	PTR	econs.com
211.50.49.10	PTR	econs.net
211.50.49.10	PTR	mail.econs.com
211.50.52.30	A	n2solution.com
211.50.52.30	A	myspace.kr
211.50.52.30	A	n2link.com
211.50.63.3	PTR	mail.cowon.com
211.50.63.130	A	partyparty.co.kr
211.50.79.164	A+PTR	ftp.mbkpartnerslp.com
211.50.79.164	A+PTR	telnet.mbkpartnerslp.com
211.50.88.169	PTR	snmcba84-s1-5.rt.bora.net
211.50.113.23	A	www.lsdir.com
211.50.114.131	A	mail.mp1.co.kr
211.50.114.144	A	buyerclub.net
211.50.116.3	A	ns2.comwins.com
211.50.116.3	A	www.comwins.com
211.50.116.42	PTR	mail.comwins.com
211.50.116.42	A+PTR	mail.sysvalley.com
211.50.116.43	A	mail.comwins.com
211.50.119.2	A	newmail.vshower.com
211.50.119.2	A	btb.gameshower.net
211.50.119.30	A	ganitani.com
211.50.119.54	A	mudfarm.net
211.50.123.3	A+PTR	gw.csk.kr
211.50.123.4	A	ms.csk.kr
211.50.125.27	A	astronest.com
211.50.125.50	A	dev.blackspotent.com
211.50.125.58	A	pandaplayshop.com