Robtex

Up: 123.204.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 123.204.48.0/23
Down right: 123.204.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.204.48.87	A+PTR	123-204-48-87.static.seed.net.tw
123.204.48.156	A	mail.pondoudou.com
123.204.48.156	A	dns.pondoudou.com
123.204.48.156	A	pondoudou.com
123.204.48.204	A+PTR	123-204-48-204.static.seed.net.tw
123.204.48.204	A	www.eff.idv.tw
123.204.48.204	A	ftp.eff.idv.tw
123.204.49.17	A+PTR	123-204-49-17.static.seed.net.tw
123.204.49.21	A+PTR	123-204-49-21.static.seed.net.tw
123.204.49.25	A+PTR	123-204-49-25.static.seed.net.tw
123.204.49.52	A+PTR	123-204-49-52.static.seed.net.tw
123.204.49.56	A+PTR	123-204-49-56.static.seed.net.tw
123.204.49.63	A+PTR	123-204-49-63.static.seed.net.tw
123.204.49.64	A+PTR	123-204-49-64.static.seed.net.tw
123.204.49.73	A+PTR	123-204-49-73.static.seed.net.tw
123.204.49.82	A+PTR	123-204-49-82.static.seed.net.tw
123.204.49.87	A+PTR	123-204-49-87.static.seed.net.tw
123.204.49.90	A+PTR	123-204-49-90.static.seed.net.tw
123.204.49.106	A+PTR	123-204-49-106.static.seed.net.tw
123.204.49.109	PTR	argtek.com
123.204.49.118	A+PTR	123-204-49-118.static.seed.net.tw
123.204.49.118	A	dns1.ulearning.com.tw
123.204.49.147	A+PTR	123-204-49-147.static.seed.net.tw
123.204.49.152	A+PTR	123-204-49-152.static.seed.net.tw
123.204.49.156	A+PTR	123-204-49-156.static.seed.net.tw
123.204.49.161	A+PTR	123-204-49-161.static.seed.net.tw
123.204.49.168	PTR	123-204-49-168.static.seed.net.tw
123.204.49.168	A	mx.hawthornemartialarts.net
123.204.49.168	A	1fruit.com
123.204.49.171	PTR	530baby.com.tw
123.204.49.181	A+PTR	123-204-49-181.static.seed.net.tw
123.204.49.183	A+PTR	123-204-49-183.static.seed.net.tw
123.204.49.188	A	titan-lcd.idv.tw
123.204.49.196	A+PTR	123-204-49-196.static.seed.net.tw
123.204.49.237	A+PTR	123-204-49-237.static.seed.net.tw
123.204.49.250	A+PTR	123-204-49-250.static.seed.net.tw
123.204.50.20	A	usakoya.com
123.204.50.20	A	usakoya.net
123.204.50.120	PTR	123-204-50-120.static.seed.net.tw
123.204.50.120	A	twbystreams.com
123.204.50.122	A	yh-bio.com.tw
123.204.50.157	A+PTR	tokyo.idv.tw
123.204.50.157	A	mtrescue.org.tw
123.204.50.157	A	chinapeaks.com
123.204.50.174	A	123-204-50-174.static.seed.net.tw
123.204.50.181	PTR	123-204-50-181.static.seed.net.tw
123.204.50.181	A	archlinux.alone.tw
123.204.50.181	A	taiwan-ayufansclubs.ddns.info
123.204.50.186	A+PTR	123-204-50-186.static.seed.net.tw
123.204.51.114	PTR	123-204-51-114.static.seed.net.tw
123.204.51.114	A	twfuwang.com
123.204.51.114	A	gjdylight.com
123.204.51.169	PTR	123-204-51-169.static.seed.net.tw
123.204.51.169	A	www.svu.com.tw
123.204.51.169	A	mail.svu.com.tw
123.204.51.213	A	lanwell.com.tw