Robtex

Up: 72.170.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.170.64.0/22
Down right: 72.170.68.0/22

IP	Type	Hostname
72.170.65.144	PTR	host721700014465.direcway.com
72.170.65.241	PTR	host721700024165.direcway.com
72.170.65.248	PTR	host721700024865.direcway.com
72.170.66.16	PTR	host72170001666.direcway.com
72.170.66.136	PTR	host721700013666.direcway.com
72.170.66.145	PTR	host721700014566.direcway.com
72.170.66.147	PTR	host721700014766.direcway.com
72.170.66.184	PTR	host721700018466.direcway.com
72.170.68.155	PTR	host721700015568.direcway.com
72.170.68.240	PTR	host721700024068.direcway.com
72.170.68.249	PTR	host721700024968.direcway.com
72.170.70.96	PTR	host72170009670.direcway.com
72.170.70.145	PTR	host721700014570.direcway.com
72.170.70.216	PTR	host721700021670.direcway.com