Robtex

Up: 203.160.64.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.160.64.0/25
Down right: 203.160.64.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.160.64.190	A	dns1.chinaunicom.com.hk
203.160.64.190	A	dns1.chu.com.hk
203.160.64.190	A	dns1.hkunicom.com
203.160.64.191	A	chu.com.hk
203.160.64.191	A	dns2.chinaunicom.com.hk
203.160.64.191	A	dns2.chu.com.hk