Robtex

Up: 203.133.56.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.133.56.0/25
Down right: 203.133.56.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.133.56.9	A+PTR	mx.twt.com.tw
203.133.56.9	A	mx.ntcatv.com
203.133.56.9	A	mx.ntctv.com.tw
203.133.56.10	A+PTR	email.twt.com.tw
203.133.56.10	A	email.ntcatv.com
203.133.56.12	A+PTR	as.twt.com.tw
203.133.56.12	A	host-203-133-56-12.static.kbtelecom.net
203.133.56.12	A	www.justtea253.com.tw
203.133.56.15	PTR	host-203-133-56-15.static.kbtelecom.net
203.133.56.15	A	www.ntctv.com.tw
203.133.56.15	A	www.twt.tw
203.133.56.18	PTR	host-203-133-56-18.static.kbtelecom.net
203.133.56.21	PTR	host-203-133-56-21.static.kbtelecom.net
203.133.56.28	A	host-203-133-56-28.static.kbtelecom.net
203.133.56.36	A	host-203-133-56-36.static.kbtelecom.net
203.133.56.45	A+PTR	host-203-133-56-45.static.kbtelecom.net
203.133.56.58	PTR	host-203-133-56-58.static.kbtelecom.net
203.133.56.69	PTR	host-203-133-56-69.static.kbtelecom.net
203.133.56.76	PTR	host-203-133-56-76.static.kbtelecom.net
203.133.56.101	PTR	host-203-133-56-101.static.kbtelecom.net
203.133.56.123	PTR	host-203-133-56-123.static.kbtelecom.net
203.133.56.129	A	host-203-133-56-129.static.kbtelecom.net
203.133.56.156	PTR	host-203-133-56-156.static.kbtelecom.net
203.133.56.166	A	host-203-133-56-166.static.kbtelecom.net
203.133.56.198	A	host-203-133-56-198.static.kbtelecom.net
203.133.56.203	PTR	host-203-133-56-203.static.kbtelecom.net
203.133.56.213	PTR	host-203-133-56-213.static.kbtelecom.net
203.133.56.219	A	host-203-133-56-219.static.kbtelecom.net
203.133.56.222	PTR	host-203-133-56-222.static.kbtelecom.net
203.133.56.225	PTR	host-203-133-56-225.static.kbtelecom.net
203.133.56.226	A	host-203-133-56-226.static.kbtelecom.net
203.133.56.229	A+PTR	host-203-133-56-229.static.kbtelecom.net
203.133.56.248	A+PTR	host-203-133-56-248.static.kbtelecom.net
203.133.56.252	A+PTR	host-203-133-56-252.static.kbtelecom.net
203.133.56.254	PTR	host-203-133-56-254.static.kbtelecom.net