Robtex

Up: 206.46.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 206.46.148.0/23
Down right: 206.46.150.0/23

IP	Type	Hostname
206.46.151.18	PTR	sunora2.west.verizon.net
206.46.151.21	A+PTR	msnlog1.west.verizon.net
206.46.151.23	A+PTR	msnlog3.west.verizon.net
206.46.151.71	A+PTR	wlweb1.west.verizon.net
206.46.151.72	PTR	wlweb2.west.verizon.net
206.46.151.76	A+PTR	wlweb6.west.verizon.net