Robtex

Up: 123.0.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 123.0.192.0/19
Down right: 123.0.224.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.0.192.1	PTR	123-0-192-1.nty.dy.tbcnet.net.tw
123.0.192.4	PTR	123-0-192-4.nty.dy.tbcnet.net.tw
123.0.193.246	A	cb.idv.tw
123.0.194.128	PTR	123-0-194-128.nty.dy.tbcnet.net.tw
123.0.194.228	A	a20138149.dddns.org
123.0.198.189	A	progames.com.tw
123.0.200.253	A	www.dib.com.tw
123.0.200.253	A	dns.dib.com.tw
123.0.200.253	A	dibap.dib.com.tw
123.0.202.195	PTR	123-0-202-195.nty.dy.tbcnet.net.tw
123.0.204.98	A	www.hot.idv.tw
123.0.204.98	A	hot.idv.tw
123.0.205.202	A	woozc.info
123.0.210.194	PTR	123-0-210-194.nty.dy.tbcnet.net.tw
123.0.212.131	PTR	123-0-212-131.nty.dy.tbcnet.net.tw
123.0.213.3	PTR	123-0-213-3.nty.dy.tbcnet.net.tw
123.0.213.244	A	progames.com.tw
123.0.213.244	A	www.progames.com.tw
123.0.213.244	A	mail.progames.com.tw
123.0.213.251	A	mail.haunsu.com.tw
123.0.214.4	PTR	123-0-214-4.nty.dy.tbcnet.net.tw
123.0.214.193	PTR	123-0-214-193.nty.dy.tbcnet.net.tw
123.0.217.2	PTR	123-0-217-2.nty.dy.tbcnet.net.tw
123.0.218.56	A	ns1.cuserver.com
123.0.221.1	PTR	123-0-221-1.nty.dy.tbcnet.net.tw
123.0.222.192	PTR	123-0-222-192.nty.dy.tbcnet.net.tw
123.0.223.130	PTR	123-0-223-130.nty.dy.tbcnet.net.tw
123.0.223.199	A	jinglamps.com
123.0.223.199	A	aitwstock.com
123.0.225.131	PTR	123-0-225-131.nty.dy.tbcnet.net.tw
123.0.226.128	PTR	123-0-226-128.nty.dy.tbcnet.net.tw
123.0.226.236	A	sun.m2ctek.com
123.0.227.2	PTR	123-0-227-2.nty.dy.tbcnet.net.tw
123.0.227.130	PTR	123-0-227-130.nty.dy.tbcnet.net.tw
123.0.228.67	PTR	123-0-228-67.nty.dy.tbcnet.net.tw
123.0.231.195	PTR	123-0-231-195.nty.dy.tbcnet.net.tw
123.0.231.235	A	mail.aimojay.com
123.0.238.33	A	xdesigter.com
123.0.241.195	PTR	123-0-241-195.nty.dy.tbcnet.net.tw
123.0.243.65	PTR	123-0-243-65.nty.dy.tbcnet.net.tw
123.0.244.170	A	x37tw.com
123.0.244.170	A	ns1.x37tw.com
123.0.244.170	A	ns2.x37tw.com
123.0.244.244	A	oemone.com.tw
123.0.244.244	A	mail.oemone.com.tw
123.0.249.78	A	5187i.com
123.0.250.195	PTR	123-0-250-195.nty.dy.tbcnet.net.tw
123.0.250.247	A	ns.agi.idv.tw
123.0.250.247	A	tw.autoglassweb.net
123.0.250.247	A	smtp.agi.idv.tw
123.0.253.130	PTR	123-0-253-130.nty.dy.tbcnet.net.tw