Robtex

Up: 24.72.144.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 24.72.144.0/22
Down right: 24.72.148.0/22

IP	Type	Hostname
24.72.144.0	A+PTR	c-24-72-144-0.ni.gigamonster.net
24.72.147.57	A+PTR	c-24-72-147-57.ni.gigamonster.net
24.72.148.61	A+PTR	c-24-72-148-61.ni.gigamonster.net
24.72.150.82	A+PTR	c-24-72-150-82.ni.gigamonster.net
24.72.151.9	A+PTR	c-24-72-151-9.ni.gigamonster.net