Robtex

Up: 97.72.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 97.72.0.0/18
Down right: 97.72.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
97.72.0.0	PTR	host977200.direcpc.com
97.72.1.2	PTR	host977221.direcpc.com
97.72.2.3	PTR	host977232.direcpc.com
97.72.2.129	PTR	host97721292.direcpc.com
97.72.8.2	PTR	host977228.direcpc.com
97.72.12.2	PTR	host9772212.direcpc.com
97.72.33.2	PTR	host9772233.direcpc.com
97.72.34.1	PTR	host9772134.direcpc.com
97.72.35.1	PTR	host9772135.direcpc.com
97.72.37.1	PTR	host9772137.direcpc.com
97.72.38.130	PTR	host977213038.direcpc.com
97.72.41.1	PTR	host9772141.direcpc.com
97.72.50.1	PTR	host9772150.direcpc.com
97.72.53.1	PTR	host9772153.direcpc.com
97.72.64.144	PTR	host977214464.direcpc.com
97.72.64.148	PTR	host977214864.direcpc.com
97.72.70.1	PTR	host9772170.direcpc.com
97.72.70.3	PTR	host9772370.direcpc.com
97.72.70.128	PTR	host977212870.direcpc.com
97.72.72.129	PTR	host977212972.direcpc.com
97.72.72.131	PTR	host977213172.direcpc.com
97.72.80.0	PTR	host9772080.direcpc.com
97.72.80.128	PTR	host977212880.direcpc.com
97.72.81.3	PTR	host9772381.direcpc.com
97.72.81.94	A	chonko.loungenet.org
97.72.82.48	A	piez0r.in
97.72.84.1	PTR	host9772184.direcpc.com
97.72.89.214	A	mail.papagod.com
97.72.89.214	A	*.printorderingsystems.com
97.72.89.214	A	papagod.com
97.72.93.214	PTR	host977221493.direcpc.com
97.72.93.214	A	hairy-pottery.com
97.72.93.214	A	realm-o-tigger.com
97.72.95.46	A	www.poguewhitetails.com
97.72.95.46	A	tweekend.com
97.72.95.46	A	poguewhitetails.com
97.72.97.1	PTR	host9772197.direcpc.com
97.72.98.1	PTR	host9772198.direcpc.com
97.72.99.1	PTR	host9772199.direcpc.com
97.72.102.22	A	lucia-lodge.com
97.72.118.2	PTR	host97722118.direcpc.com
97.72.121.214	A	mail2.jetnetsolutions.com
97.72.123.134	A	mail2.pinnaclepolymers.com
97.72.125.171	A	mail.ags-mi.com