Robtex

Up: 72.255.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 72.255.192.0/19
Down right: 72.255.224.0/19

IP	Type	Hostname
72.255.195.209	PTR	72-255-195-209.client.stsn.net
72.255.199.65	PTR	72-255-199-65.client.stsn.net
72.255.199.128	PTR	72-255-199-128.client.stsn.net
72.255.199.130	PTR	72-255-199-130.client.stsn.net
72.255.199.193	PTR	72-255-199-193.client.stsn.net
72.255.200.0	PTR	72-255-200-0.client.stsn.net
72.255.200.2	PTR	72-255-200-2.client.stsn.net
72.255.200.192	PTR	72-255-200-192.client.stsn.net
72.255.201.0	PTR	72-255-201-0.client.stsn.net
72.255.201.131	PTR	72-255-201-131.client.stsn.net
72.255.201.195	PTR	72-255-201-195.client.stsn.net
72.255.202.0	PTR	72-255-202-0.client.stsn.net
72.255.202.3	PTR	72-255-202-3.client.stsn.net
72.255.202.65	PTR	72-255-202-65.client.stsn.net
72.255.202.131	PTR	72-255-202-131.client.stsn.net
72.255.202.193	PTR	72-255-202-193.client.stsn.net
72.255.202.194	PTR	72-255-202-194.client.stsn.net
72.255.223.131	PTR	72-255-223-131.client.stsn.net
72.255.223.192	PTR	72-255-223-192.client.stsn.net
72.255.223.193	PTR	72-255-223-193.client.stsn.net
72.255.223.194	PTR	72-255-223-194.client.stsn.net
72.255.231.80	A	ns1.applebb.net
72.255.233.1	PTR	72-255-233-1.client.stsn.net
72.255.235.0	PTR	72-255-235-0.client.stsn.net
72.255.235.129	PTR	72-255-235-129.client.stsn.net
72.255.241.66	PTR	72-255-241-66.client.stsn.net
72.255.241.192	PTR	72-255-241-192.client.stsn.net
72.255.241.194	PTR	72-255-241-194.client.stsn.net
72.255.255.255	PTR	72-255-255-255.static.imsbiz.com