Robtex

Up: 72.73.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.73.76.0/23
Down right: 72.73.78.0/23

IP	Type	Hostname
72.73.76.89	PTR	pool-72-73-76-89.ptldme.east.myfairpoint.net
72.73.76.101	A+PTR	pool-72-73-76-101.ptldme.east.myfairpoint.net
72.73.76.106	A+PTR	pool-72-73-76-106.ptldme.east.myfairpoint.net
72.73.76.250	A	pool-72-73-76-250.ptldme.east.myfairpoint.net
72.73.77.29	A	pool-72-73-77-29.ptldme.east.myfairpoint.net
72.73.77.56	A	pool-72-73-77-56.ptldme.east.myfairpoint.net
72.73.78.75	A+PTR	pool-72-73-78-75.ptldme.east.myfairpoint.net
72.73.79.195	A	pool-72-73-79-195.ptldme.east.myfairpoint.net
72.73.79.224	A+PTR	pool-72-73-79-224.ptldme.east.myfairpoint.net