Robtex

Up: 221.169.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 221.169.32.0/20
Down right: 221.169.48.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.169.33.2	PTR	sw169-33-2.static.seed.net.tw
221.169.33.34	PTR	sw169-33-34.static.seed.net.tw
221.169.33.97	PTR	sw169-33-97.static.seed.net.tw
221.169.34.2	PTR	sw169-34-2.static.seed.net.tw
221.169.35.255	PTR	sw169-35-255.static.seed.net.tw
221.169.37.125	PTR	sw169-37-125.static.seed.net.tw
221.169.37.125	A	sw169-37-125.adsl.seed.net.tw
221.169.37.159	PTR	sw169-37-159.static.seed.net.tw
221.169.39.125	PTR	sw169-39-125.static.seed.net.tw
221.169.41.131	PTR	sw169-41-131.static.seed.net.tw
221.169.42.143	PTR	sw169-42-143.static.seed.net.tw
221.169.45.102	PTR	sw169-45-102.static.seed.net.tw
221.169.45.104	PTR	sw169-45-104.static.seed.net.tw
221.169.45.104	A	sw169-45-104.adsl.seed.net.tw
221.169.45.145	PTR	sw169-45-145.static.seed.net.tw
221.169.47.13	PTR	sw169-47-13.static.seed.net.tw
221.169.47.13	A	sw169-47-13.adsl.seed.net.tw
221.169.47.13	A	ns2.budaedu.org.tw
221.169.47.111	PTR	sw169-47-111.static.seed.net.tw
221.169.48.188	A	outdoor-active.com.tw
221.169.50.156	A	out.bull.com.tw
221.169.58.0	PTR	sw169-58-0.static.seed.net.tw
221.169.58.32	PTR	sw169-58-32.static.seed.net.tw
221.169.58.65	PTR	sw169-58-65.static.seed.net.tw
221.169.58.67	PTR	sw169-58-67.static.seed.net.tw
221.169.58.98	PTR	sw169-58-98.static.seed.net.tw
221.169.58.99	PTR	sw169-58-99.static.seed.net.tw
221.169.58.160	PTR	sw169-58-160.static.seed.net.tw
221.169.58.195	PTR	sw169-58-195.static.seed.net.tw
221.169.58.224	PTR	sw169-58-224.static.seed.net.tw
221.169.58.226	PTR	sw169-58-226.static.seed.net.tw