Robtex

Up: 64.188.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 64.188.140.0/23
Down right: 64.188.142.0/23

IP	Type	Hostname
64.188.140.9	PTR	64.188.140.9.dynamic.zitomedia.net
64.188.141.10	PTR	64.188.141.10.dynamic.zitomedia.net
64.188.141.191	PTR	64.188.141.191.dynamic.zitomedia.net
64.188.142.52	PTR	64.188.142.52.dynamic.zitomedia.net