Robtex

Up: 123.203.44.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.203.45.0/25
Down right: 123.203.45.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.203.45.39	A	123203045039.ctinets.com
123.203.45.43	A	123203045043.ctinets.com
123.203.45.78	A+PTR	123203045078.ctinets.com
123.203.45.78	A	idler.189.com.hk
123.203.45.78	A	idler.pcinhk.com
123.203.45.105	A	123203045105.ctinets.com
123.203.45.164	A	123203045164.ctinets.com
123.203.45.216	A	123203045216.ctinets.com