Robtex

Up: 211.61.50.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 211.61.50.0/25
Down right: 211.61.50.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
211.61.50.101	A+PTR	ns.cwd.go.kr
211.61.50.101	PTR	ns.president.go.kr
211.61.50.101	A+PTR	ns.bh.go.kr
211.61.50.103	A+PTR	gmail.bluehouse.go.kr
211.61.50.103	PTR	gmail.cheongwadae.go.kr
211.61.50.103	A+PTR	gmail.chongwadae.go.kr
211.61.50.104	A+PTR	nmail.cwd.go.kr
211.61.50.104	A+PTR	nmail.president.go.kr
211.61.50.104	PTR	bmail.or.kr
211.61.50.107	A	fmail.president.go.kr
211.61.50.107	A	fmail.cwd.go.kr
211.61.50.111	A+PTR	wise.bluehouse.go.kr
211.61.50.111	PTR	wise.cheongwadae.go.kr
211.61.50.111	PTR	wise.chongwadae.go.kr
211.61.50.115	A	nmail1.chongwadae.go.kr
211.61.50.115	A	nmail1.bluehouse.go.kr
211.61.50.115	A	nmail1.cwd.go.kr
211.61.50.117	A+PTR	nmail2.bluehouse.go.kr
211.61.50.117	PTR	nmail2.cheongwadae.go.kr
211.61.50.117	A+PTR	nmail2.chongwadae.go.kr
211.61.50.127	A	nmail2.cwd.go.kr