Robtex

Up: 123.203.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.203.28.0/23
Down right: 123.203.30.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.203.28.2	A	123203028002.ctinets.com
123.203.28.9	A	123203028009.ctinets.com
123.203.28.69	A	123203028069.ctinets.com
123.203.28.73	A	123203028073.ctinets.com
123.203.28.80	A+PTR	123203028080.ctinets.com
123.203.28.117	A+PTR	123203028117.ctinets.com
123.203.28.189	A	123203028189.ctinets.com
123.203.28.193	A	123203028193.ctinets.com
123.203.28.198	A	perrepang.myftp.org
123.203.28.213	A+PTR	123203028213.ctinets.com
123.203.29.2	A	123203029002.ctinets.com
123.203.29.6	A	123203029006.ctinets.com
123.203.29.15	A+PTR	123203029015.ctinets.com
123.203.29.19	A+PTR	123203029019.ctinets.com
123.203.29.92	A	123203029092.ctinets.com
123.203.29.104	A+PTR	123203029104.ctinets.com
123.203.29.114	A	mail.sopaawards.com
123.203.29.138	A+PTR	123203029138.ctinets.com
123.203.29.138	A	mail.edwin-mobile.com
123.203.29.150	A	123203029150.ctinets.com
123.203.29.160	A+PTR	123203029160.ctinets.com
123.203.29.160	A	utcwnap.bqswahkmliql.hath.network
123.203.29.160	A	yxxhqkn.bqswahkmliql.hath.network
123.203.30.2	A	123203030002.ctinets.com
123.203.30.56	A+PTR	123203030056.ctinets.com
123.203.30.125	A	123203030125.ctinets.com
123.203.30.131	A	123203030131.ctinets.com
123.203.30.149	A	123203030149.ctinets.com
123.203.30.181	A	123203030181.ctinets.com
123.203.30.197	A	123203030197.ctinets.com
123.203.30.200	A	123203030200.ctinets.com
123.203.30.207	A	123203030207.ctinets.com
123.203.30.215	A	123203030215.ctinets.com
123.203.30.219	A	123203030219.ctinets.com
123.203.30.223	A	keypoint.com.hk
123.203.30.225	A	123203030225.ctinets.com
123.203.31.15	A	123203031015.ctinets.com
123.203.31.91	A	123203031091.ctinets.com
123.203.31.160	A	123203031160.ctinets.com
123.203.31.179	A	123203031179.ctinets.com
123.203.31.238	A	123203031238.ctinets.com