Robtex

Up: 123.240.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 123.240.192.0/22
Down right: 123.240.196.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.240.192.18	PTR	123-240-192-18.cctv.dynamic.tbcnet.net.tw
123.240.192.27	PTR	123-240-192-27.cctv.dynamic.tbcnet.net.tw
123.240.192.242	PTR	123-240-192-242.cctv.dynamic.tbcnet.net.tw
123.240.192.249	PTR	123-240-192-249.cctv.dynamic.tbcnet.net.tw
123.240.193.35	PTR	123-240-193-35.cctv.dynamic.tbcnet.net.tw
123.240.193.154	PTR	123-240-193-154.cctv.dynamic.tbcnet.net.tw
123.240.194.184	PTR	123-240-194-184.cctv.dynamic.tbcnet.net.tw
123.240.194.226	PTR	123-240-194-226.cctv.dynamic.tbcnet.net.tw
123.240.196.178	PTR	123-240-196-178.cctv.dynamic.tbcnet.net.tw
123.240.196.203	PTR	123-240-196-203.cctv.dynamic.tbcnet.net.tw
123.240.197.17	PTR	123-240-197-17.cctv.dynamic.tbcnet.net.tw
123.240.197.42	PTR	123-240-197-42.cctv.dynamic.tbcnet.net.tw
123.240.197.43	PTR	123-240-197-43.cctv.dynamic.tbcnet.net.tw
123.240.197.83	PTR	123-240-197-83.cctv.dynamic.tbcnet.net.tw
123.240.197.114	PTR	123-240-197-114.cctv.dynamic.tbcnet.net.tw
123.240.197.224	PTR	123-240-197-224.cctv.dynamic.tbcnet.net.tw
123.240.197.242	PTR	123-240-197-242.cctv.dynamic.tbcnet.net.tw
123.240.198.4	PTR	123-240-198-4.cctv.dynamic.tbcnet.net.tw
123.240.198.34	PTR	123-240-198-34.cctv.dynamic.tbcnet.net.tw
123.240.198.43	PTR	123-240-198-43.cctv.dynamic.tbcnet.net.tw
123.240.198.99	PTR	123-240-198-99.cctv.dynamic.tbcnet.net.tw
123.240.198.120	PTR	123-240-198-120.cctv.dynamic.tbcnet.net.tw
123.240.198.122	PTR	123-240-198-122.cctv.dynamic.tbcnet.net.tw
123.240.198.163	PTR	123-240-198-163.cctv.dynamic.tbcnet.net.tw
123.240.198.171	PTR	123-240-198-171.cctv.dynamic.tbcnet.net.tw
123.240.198.208	PTR	123-240-198-208.cctv.dynamic.tbcnet.net.tw
123.240.198.216	PTR	123-240-198-216.cctv.dynamic.tbcnet.net.tw
123.240.198.234	PTR	123-240-198-234.cctv.dynamic.tbcnet.net.tw
123.240.198.235	PTR	123-240-198-235.cctv.dynamic.tbcnet.net.tw
123.240.198.241	PTR	123-240-198-241.cctv.dynamic.tbcnet.net.tw
123.240.199.26	PTR	123-240-199-26.cctv.dy.tbcnet.net.tw
123.240.199.26	A	dns.successful.com.tw
123.240.199.26	A	synergy.7788.com.tw
123.240.199.249	A	www.7788.com.tw
123.240.199.249	A	dns.tm888.com.tw