Robtex

Up: 61.110.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 61.110.0.0/20
Down right: 61.110.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
61.110.2.56	PTR	mail.halla.com
61.110.2.56	PTR	mail.icols.com
61.110.2.56	PTR	mail.mandoplaza.com
61.110.2.92	PTR	mta05.icols.com
61.110.4.11	A	ns1.zcdn.co.kr
61.110.4.12	A	ns2.zcdn.co.kr
61.110.4.83	A	emcache01.zcdn.co.kr
61.110.4.93	A	emcache01.zcdn.co.kr
61.110.4.101	A	emcache01.zcdn.co.kr
61.110.4.102	A	emcache01.zcdn.co.kr
61.110.4.103	A	emcache01.zcdn.co.kr
61.110.4.111	A	emcache01.zcdn.co.kr
61.110.4.112	A	emcache01.zcdn.co.kr
61.110.4.113	A	emcache01.zcdn.co.kr
61.110.4.227	A	kcsagentnxr.kamuse.zcdn.co.kr
61.110.4.233	A	kcsagentnxr.kamuse.zcdn.co.kr
61.110.7.23	A	crsmedia.co.kr
61.110.17.112	A	www.down2.co.kr
61.110.18.130	A	dittabook.co.kr
61.110.18.130	A	dittabook.com
61.110.20.156	PTR	halla.co.kr
61.110.20.161	PTR	halla.co.kr
61.110.20.161	A	xn--z69a52s6whq5u.net
61.110.20.161	A	xn--oi2bn08c.net
61.110.20.162	PTR	spam.halla.com
61.110.20.163	PTR	mail.halla.com
61.110.20.164	PTR	halla.co.kr
61.110.24.42	A	mail.ehrdi-kut.ac.kr
61.110.24.42	A	ehrdi-kut.ac.kr
61.110.24.46	A	mail.ekoreatech.ac.kr
61.110.24.46	A	mail.ekut.ac.kr
61.110.25.10	PTR	samwhapaper.com
61.110.25.31	PTR	anyline.co.kr
61.110.25.33	PTR	mail.anyline.co.kr
61.110.25.62	PTR	server.introcom.net