Robtex

Up: 123.203.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.203.172.0/23
Down right: 123.203.174.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.203.172.28	A+PTR	123203172028.ctinets.com
123.203.172.43	A	123203172043.ctinets.com
123.203.172.68	A	123203172068.ctinets.com
123.203.172.153	A+PTR	123203172153.ctinets.com
123.203.172.153	A	ericlam.org
123.203.172.159	A+PTR	123203172159.ctinets.com
123.203.172.159	A	mail.wannas.org
123.203.172.165	A	mail1.towatoland.com
123.203.172.165	A	mail1a.cheunghang.com
123.203.172.165	A	mail1.hinnosolutions.com
123.203.172.193	A+PTR	123203172193.ctinets.com
123.203.172.196	A+PTR	123203172196.ctinets.com
123.203.172.201	A	123203172201.ctinets.com
123.203.172.204	A	123203172204.ctinets.com
123.203.172.238	A	123203172238.ctinets.com
123.203.172.243	A+PTR	123203172243.ctinets.com
123.203.172.246	A	123203172246.ctinets.com
123.203.172.248	A	123203172248.ctinets.com
123.203.173.1	A+PTR	123203173001.ctinets.com
123.203.173.12	A+PTR	123203173012.ctinets.com
123.203.173.22	A	123203173022.ctinets.com
123.203.173.69	A	123203173069.ctinets.com
123.203.173.86	A	123203173086.ctinets.com
123.203.174.26	A	123203174026.ctinets.com
123.203.174.34	A+PTR	123203174034.ctinets.com
123.203.174.74	A	123203174074.ctinets.com
123.203.174.93	A+PTR	123203174093.ctinets.com
123.203.174.138	A+PTR	123203174138.ctinets.com
123.203.174.164	A	123203174164.ctinets.com
123.203.174.252	A	123203174252.ctinets.com
123.203.175.55	PTR	123203175055.ctinets.com
123.203.175.56	A	123203175056.ctinets.com
123.203.175.99	A	123203175099.ctinets.com
123.203.175.121	A	123203175121.ctinets.com
123.203.175.132	A	123203175132.ctinets.com
123.203.175.139	A	123203175139.ctinets.com
123.203.175.183	A	123203175183.ctinets.com
123.203.175.202	A	123203175202.ctinets.com
123.203.175.205	A	123203175205.ctinets.com
123.203.175.236	A	123203175236.ctinets.com
123.203.175.252	A	123203175252.ctinets.com