Robtex

Up: 123.203.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.203.20.0/23
Down right: 123.203.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.203.20.3	A+PTR	123203020003.ctinets.com
123.203.20.61	A	123203020061.ctinets.com
123.203.20.73	A+PTR	123203020073.ctinets.com
123.203.20.88	A+PTR	123203020088.ctinets.com
123.203.20.160	A	123203020160.ctinets.com
123.203.20.193	A+PTR	123203020193.ctinets.com
123.203.20.232	A	123203020232.ctinets.com
123.203.21.6	A+PTR	123203021006.ctinets.com
123.203.21.7	A+PTR	123203021007.ctinets.com
123.203.21.13	A+PTR	123203021013.ctinets.com
123.203.21.14	A+PTR	123203021014.ctinets.com
123.203.21.19	A+PTR	123203021019.ctinets.com
123.203.21.20	A+PTR	123203021020.ctinets.com
123.203.21.21	A+PTR	123203021021.ctinets.com
123.203.21.22	A+PTR	123203021022.ctinets.com
123.203.21.28	A+PTR	123203021028.ctinets.com
123.203.21.36	A+PTR	123203021036.ctinets.com
123.203.21.38	A+PTR	123203021038.ctinets.com
123.203.21.40	A	123203021040.ctinets.com
123.203.21.42	A+PTR	123203021042.ctinets.com
123.203.21.51	A+PTR	123203021051.ctinets.com
123.203.21.57	A+PTR	123203021057.ctinets.com
123.203.21.58	A+PTR	123203021058.ctinets.com
123.203.21.59	A+PTR	123203021059.ctinets.com
123.203.21.60	A+PTR	123203021060.ctinets.com
123.203.21.62	A+PTR	123203021062.ctinets.com
123.203.21.63	A+PTR	123203021063.ctinets.com
123.203.21.64	A+PTR	123203021064.ctinets.com
123.203.21.83	A+PTR	123203021083.ctinets.com
123.203.21.86	A+PTR	123203021086.ctinets.com
123.203.21.91	A+PTR	123203021091.ctinets.com
123.203.21.96	A+PTR	123203021096.ctinets.com
123.203.21.97	A+PTR	123203021097.ctinets.com
123.203.21.102	A+PTR	123203021102.ctinets.com
123.203.21.107	A+PTR	123203021107.ctinets.com
123.203.21.111	A	123203021111.ctinets.com
123.203.21.112	A+PTR	123203021112.ctinets.com
123.203.21.113	A+PTR	123203021113.ctinets.com
123.203.21.116	A+PTR	123203021116.ctinets.com
123.203.21.123	A+PTR	123203021123.ctinets.com
123.203.21.127	A+PTR	123203021127.ctinets.com
123.203.21.131	A+PTR	123203021131.ctinets.com
123.203.21.134	A+PTR	123203021134.ctinets.com
123.203.21.139	A+PTR	123203021139.ctinets.com
123.203.21.155	A+PTR	123203021155.ctinets.com
123.203.21.157	A+PTR	123203021157.ctinets.com
123.203.21.159	A+PTR	123203021159.ctinets.com
123.203.21.171	A+PTR	123203021171.ctinets.com
123.203.21.179	A+PTR	123203021179.ctinets.com
123.203.21.180	A+PTR	123203021180.ctinets.com
123.203.21.194	A+PTR	123203021194.ctinets.com
123.203.21.196	A+PTR	123203021196.ctinets.com
123.203.21.197	A	123203021197.ctinets.com
123.203.21.198	A+PTR	123203021198.ctinets.com
123.203.21.201	A+PTR	123203021201.ctinets.com
123.203.21.211	A+PTR	123203021211.ctinets.com
123.203.21.212	A+PTR	123203021212.ctinets.com
123.203.21.224	A+PTR	123203021224.ctinets.com
123.203.21.225	A+PTR	123203021225.ctinets.com
123.203.21.226	A	123203021226.ctinets.com
123.203.21.227	A+PTR	123203021227.ctinets.com
123.203.21.229	A+PTR	123203021229.ctinets.com
123.203.21.230	A	819808019509.sn.mynetname.net
123.203.21.231	A+PTR	123203021231.ctinets.com
123.203.21.238	A+PTR	123203021238.ctinets.com
123.203.21.241	A+PTR	123203021241.ctinets.com
123.203.21.243	A+PTR	123203021243.ctinets.com
123.203.21.246	A	is01.ddns.net
123.203.21.246	A	hoishun.no-ip.org
123.203.21.246	A	is02.ddns.net
123.203.21.249	A+PTR	123203021249.ctinets.com
123.203.22.3	A	123203022003.ctinets.com
123.203.22.27	A	123203022027.ctinets.com
123.203.22.29	A+PTR	123203022029.ctinets.com
123.203.22.42	PTR	123203022042.ctinets.com
123.203.22.42	A	*.san.ltd.st
123.203.22.42	A	email-box.net
123.203.22.62	A	123203022062.ctinets.com
123.203.22.75	A	123203022075.ctinets.com
123.203.22.127	A	123203022127.ctinets.com
123.203.22.133	A	123203022133.ctinets.com
123.203.22.134	A	123203022134.ctinets.com
123.203.22.137	A	123203022137.ctinets.com
123.203.22.160	A	123203022160.ctinets.com
123.203.22.221	A	123203022221.ctinets.com
123.203.22.227	A	123203022227.ctinets.com
123.203.22.234	A	123203022234.ctinets.com
123.203.23.92	A	123203023092.ctinets.com
123.203.23.136	A	123203023136.ctinets.com
123.203.23.144	A+PTR	123203023144.ctinets.com
123.203.23.148	A	123203023148.ctinets.com
123.203.23.156	A	123203023156.ctinets.com
123.203.23.169	A+PTR	123203023169.ctinets.com
123.203.23.196	A	123203023196.ctinets.com
123.203.23.211	A+PTR	123203023211.ctinets.com