Robtex

Up: 72.255.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.255.224.0/20
Down right: 72.255.240.0/20

IP	Type	Hostname
72.255.230.34	PTR	72-255-230-34.client.stsn.net
72.255.231.80	A	ns1.applebb.net
72.255.233.1	PTR	72-255-233-1.client.stsn.net
72.255.233.160	PTR	72-255-233-160.client.stsn.net
72.255.233.224	PTR	72-255-233-224.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
72.255.235.162	PTR	72-255-235-162.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