Robtex

Up: 72.168.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.168.0.0/20
Down right: 72.168.16.0/20

IP	Type	Hostname
72.168.0.0	PTR	host721680000.direcway.com
72.168.0.1	PTR	host721680010.direcway.com
72.168.1.1	PTR	host721680011.direcway.com
72.168.1.162	PTR	host72168001621.direcway.com
72.168.2.3	PTR	host721680032.direcway.com
72.168.4.1	PTR	host721680014.direcway.com
72.168.4.2	PTR	host721680024.direcway.com
72.168.14.2	PTR	host7216800214.direcway.com
72.168.18.2	PTR	host7216800218.direcway.com
72.168.20.0	PTR	host7216800020.direcway.com
72.168.22.13	A	back40salvage.com
72.168.22.13	A	www.back40salvage.com
72.168.24.2	PTR	host7216800224.direcway.com
72.168.28.131	PTR	host721680013128.direcway.com