Robtex

Up: 66.47.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.47.144.0/23
Down right: 66.47.146.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.47.144.41	A+PTR	user-112v419.biz.mindspring.com
66.47.144.41	A	rhensley.com
66.47.144.41	A	rhensley.net
66.47.145.52	A	user-112v49k.biz.mindspring.com
66.47.146.249	PTR	user-112v4np.biz.mindspring.com