Robtex

Up: 211.47.66.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 211.47.67.0/25
Down right: 211.47.67.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.47.67.1	PTR	mail-1.tt.co.kr
211.47.67.1	A	ys-worldlink.com
211.47.67.2	PTR	smtphub.tt.co.kr
211.47.67.4	A	mail-4.tt.co.kr
211.47.67.5	PTR	smtphub.tt.co.kr
211.47.67.17	PTR	smtphub.tt.co.kr
211.47.67.32	PTR	mail-32.tt.co.kr
211.47.67.32	A	mail.kaots.or.kr
211.47.67.52	A+PTR	mail-2.tt.co.kr
211.47.67.53	A+PTR	mail-3.tt.co.kr
211.47.67.54	A	mail-4.tt.co.kr
211.47.67.55	A	mail-5.tt.co.kr
211.47.67.58	A+PTR	mail-8.tt.co.kr
211.47.67.59	A+PTR	mail-9.tt.co.kr
211.47.67.60	A+PTR	mail-10.tt.co.kr
211.47.67.62	A+PTR	mail-12.tt.co.kr
211.47.67.62	A	lupus.co.kr
211.47.67.63	A+PTR	mail-13.tt.co.kr
211.47.67.63	A	e-hanguk.com
211.47.67.63	A	rochersliancourt.com
211.47.67.64	A+PTR	mail-14.tt.co.kr
211.47.67.65	A	koreanew.com
211.47.67.65	A	texinfo.co.kr
211.47.67.67	A+PTR	mail-17.tt.co.kr
211.47.67.69	A+PTR	mail-19.tt.co.kr
211.47.67.69	A	com114.net
211.47.67.71	A+PTR	mail-21.tt.co.kr
211.47.67.74	A+PTR	mail-24.tt.co.kr
211.47.67.81	A+PTR	mail-31.tt.co.kr
211.47.67.81	A	mail.feelav.com
211.47.67.81	A	mail.neeo.net
211.47.67.104	A	ns1.bookkorea.com
211.47.67.104	A	ns2.bookkorea.com
211.47.67.116	A	tradeshow.co.kr
211.47.67.169	PTR	ns.21line.co.kr
211.47.67.169	PTR	smtphub.tt.co.kr
211.47.67.172	PTR	smtphub.tt.co.kr
211.47.67.187	PTR	smtphub.tt.co.kr
211.47.67.193	PTR	smtphub.tt.co.kr
211.47.67.198	PTR	smtphub.tt.co.kr
211.47.67.210	PTR	ns.kbid.co.kr
211.47.67.245	A	beautyon.net
211.47.67.245	A	www.beautyon.net