Robtex

Up: 123.240.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 123.240.240.0/22
Down right: 123.240.244.0/22

IP	Type	Hostname
123.240.240.139	PTR	123-240-240-139.cctv.dynamic.tbcnet.net.tw
123.240.242.122	PTR	123-240-242-122.cctv.dynamic.tbcnet.net.tw
123.240.244.3	PTR	123-240-244-3.cctv.dynamic.tbcnet.net.tw
123.240.244.217	PTR	123-240-244-217.cctv.dynamic.tbcnet.net.tw
123.240.244.249	PTR	123-240-244-249.cctv.dynamic.tbcnet.net.tw
123.240.245.10	PTR	123-240-245-10.cctv.dynamic.tbcnet.net.tw
123.240.245.43	PTR	123-240-245-43.cctv.dynamic.tbcnet.net.tw
123.240.245.59	PTR	123-240-245-59.cctv.dynamic.tbcnet.net.tw
123.240.245.82	PTR	123-240-245-82.cctv.dynamic.tbcnet.net.tw
123.240.245.105	PTR	123-240-245-105.cctv.dynamic.tbcnet.net.tw
123.240.245.137	PTR	123-240-245-137.cctv.dynamic.tbcnet.net.tw
123.240.245.176	PTR	123-240-245-176.cctv.dynamic.tbcnet.net.tw
123.240.245.189	A	rangeseed.com
123.240.245.226	PTR	123-240-245-226.cctv.dynamic.tbcnet.net.tw
123.240.246.18	A	xn--bls64cy7g61grljv30a.com
123.240.246.30	A	aininuo.com
123.240.246.58	PTR	123-240-246-58.cctv.dynamic.tbcnet.net.tw
123.240.246.105	PTR	123-240-246-105.cctv.dynamic.tbcnet.net.tw
123.240.246.130	PTR	123-240-246-130.cctv.dynamic.tbcnet.net.tw
123.240.246.176	PTR	aii.com.tw
123.240.247.144	PTR	123-240-247-144.cctv.dynamic.tbcnet.net.tw
123.240.247.146	PTR	123-240-247-146.cctv.dynamic.tbcnet.net.tw
123.240.247.178	PTR	123-240-247-178.cctv.dynamic.tbcnet.net.tw