Robtex

Up: 123.240.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 123.240.192.0/19
Down right: 123.240.224.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.240.198.4	PTR	123-240-198-4.cctv.dynamic.tbcnet.net.tw
123.240.199.26	A	dns.successful.com.tw
123.240.199.26	A	synergy.7788.com.tw
123.240.199.26	A	tm888.com.tw
123.240.199.249	A	www.7788.com.tw
123.240.199.249	A	dns.tm888.com.tw
123.240.203.193	PTR	123-240-203-193.cctv.dynamic.tbcnet.net.tw
123.240.207.14	A	mail.seamus.idv.tw
123.240.207.14	A	seamus.idv.tw
123.240.207.247	A	infoex.infocloud.com
123.240.209.195	PTR	123-240-209-195.cctv.dynamic.tbcnet.net.tw
123.240.211.38	A	infoex.infocloud.com
123.240.211.38	A	mail.infocloud.com
123.240.211.179	A	webtrans.com.tw
123.240.211.179	A	dentallink.com.tw
123.240.212.195	PTR	123-240-212-195.cctv.dynamic.tbcnet.net.tw
123.240.214.2	PTR	123-240-214-2.cctv.dynamic.tbcnet.net.tw
123.240.214.11	A	www.ihere.tw
123.240.214.11	A	ihere.tw
123.240.214.129	PTR	123-240-214-129.cctv.dynamic.tbcnet.net.tw
123.240.227.3	PTR	123-240-227-3.cctv.dynamic.tbcnet.net.tw
123.240.227.64	PTR	123-240-227-64.cctv.dynamic.tbcnet.net.tw
123.240.228.130	PTR	123-240-228-130.cctv.dynamic.tbcnet.net.tw
123.240.229.13	A	momentum-ltd.com
123.240.233.4	PTR	123-240-233-4.cctv.dynamic.tbcnet.net.tw
123.240.234.2	PTR	123-240-234-2.cctv.dynamic.tbcnet.net.tw
123.240.234.64	PTR	123-240-234-64.cctv.dynamic.tbcnet.net.tw
123.240.234.67	PTR	123-240-234-67.cctv.dynamic.tbcnet.net.tw
123.240.234.129	PTR	123-240-234-129.cctv.dynamic.tbcnet.net.tw
123.240.235.41	A	www.chenpei.com.tw
123.240.235.130	PTR	123-240-235-130.cctv.dynamic.tbcnet.net.tw
123.240.235.194	PTR	123-240-235-194.cctv.dynamic.tbcnet.net.tw
123.240.238.2	PTR	123-240-238-2.cctv.dynamic.tbcnet.net.tw
123.240.244.3	PTR	123-240-244-3.cctv.dynamic.tbcnet.net.tw
123.240.245.189	A	rangeseed.com
123.240.246.18	A	xn--bls64cy7g61grljv30a.com
123.240.246.30	A	aininuo.com
123.240.246.130	PTR	123-240-246-130.cctv.dynamic.tbcnet.net.tw
123.240.249.65	PTR	123-240-249-65.cctv.dynamic.tbcnet.net.tw
123.240.249.128	PTR	123-240-249-128.cctv.dynamic.tbcnet.net.tw
123.240.249.192	PTR	123-240-249-192.cctv.dynamic.tbcnet.net.tw
123.240.251.193	PTR	123-240-251-193.cctv.dynamic.tbcnet.net.tw
123.240.255.1	A+PTR	dns4.tbcnet.net.tw
123.240.255.26	A	custom.tbcnet.net.tw
123.240.255.35	A	www.cctv.com.tw
123.240.255.39	A	mail.cctv.com.tw
123.240.255.242	A	noc.tbcnet.net.tw