Robtex

Up: 66.6.46.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.6.47.0/25
Down right: 66.6.47.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.6.47.0	PTR	ptp-network-0.dfw01.as33612.net
66.6.47.5	A	ae1.edge01.dfw01.as33612.net
66.6.47.8	A+PTR	ptp-network-8.dfw01.as33612.net
66.6.47.15	A+PTR	ptp-bcast-15.dfw01.as33612.net
66.6.47.118	A	ae3.edge02.ewr01.as33612.net
66.6.47.252	A+PTR	lo0.core01.dfw01.as33612.net
66.6.47.252	PTR	lo0.edge01.ewr01.as33612.net
66.6.47.252	A	lo0.re0.edge01.ewr01.as33612.net
66.6.47.255	A+PTR	lo0.edge01.dfw01.as33612.net
66.6.47.255	A	edge01.dfw01.as33612.net