Robtex

Up: 200.64.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 200.64.64.0/20
Down right: 200.64.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
200.64.67.2	PTR	dup-200-64-67-2.prodigy.net.mx
200.64.67.32	PTR	dup-200-64-67-32.prodigy.net.mx
200.64.67.97	PTR	dup-200-64-67-97.prodigy.net.mx
200.64.67.98	PTR	dup-200-64-67-98.prodigy.net.mx
200.64.67.195	PTR	dup-200-64-67-195.prodigy.net.mx
200.64.67.225	PTR	dup-200-64-67-225.prodigy.net.mx
200.64.68.2	PTR	dup-200-64-68-2.prodigy.net.mx
200.64.68.4	PTR	dup-200-64-68-4.prodigy.net.mx
200.64.68.98	PTR	dup-200-64-68-98.prodigy.net.mx
200.64.68.132	PTR	dup-200-64-68-132.prodigy.net.mx
200.64.68.162	PTR	dup-200-64-68-162.prodigy.net.mx
200.64.73.99	PTR	dup-200-64-73-99.prodigy.net.mx
200.64.73.131	PTR	dup-200-64-73-131.prodigy.net.mx
200.64.84.128	A	ns3.vypdwkbamsyjbopkeyg.pw
200.64.84.128	A	ns1.vypdwkbamsyjbopkeyg.pw
200.64.84.128	A	vypdwkbamsyjbopkeyg.pw
200.64.93.66	PTR	dup-200-64-93-66.prodigy.net.mx