Robtex

Up: 211.41.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 211.41.0.0/20
Down right: 211.41.16.0/20

IP	Type	Hostname
211.41.4.34	PTR	ns2.igroupnet.co.kr
211.41.4.41	PTR	roadin.net
211.41.7.10	PTR	smtp.e-travel.co.kr
211.41.14.35	PTR	gicreik.co.kr
211.41.14.35	PTR	korsmtp01.gicreik.co.kr
211.41.21.234	PTR	nara.ne.kr
211.41.21.234	PTR	mail.nara.ne.kr
211.41.21.234	PTR	www.nara.ne.kr
211.41.31.35	PTR	xspeed.co.kr
211.41.31.35	PTR	www.xspeed.co.kr