Robtex

Up: 210.181.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 210.181.224.0/20
Down right: 210.181.240.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
210.181.228.254	PTR	icpa.co.kr
210.181.228.254	PTR	icpa.or.kr
210.181.228.254	PTR	www.icpa.co.kr
210.181.236.3	A+PTR	mail.mnwise.com
210.181.236.20	A	imas.co.kr
210.181.236.125	A+PTR	spam.mnwise.com
210.181.240.134	A	dns.hwashin.net
210.181.240.135	PTR	mail.hwashin.net
210.181.240.135	A	ns.hwashin.net
210.181.240.135	A	server2.hwashin.net
210.181.245.46	A	firechattalk.com
210.181.247.4	PTR	mail.i-stylus.com.247.181.210.in-addr.arpa
210.181.247.4	A	i-stylus.com