Robtex

Up: 64.185.128.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 64.185.132.0/23
Down right: 64.185.134.0/23

IP	Type	Hostname
64.185.132.73	PTR	user-10bj129.cable.mindspring.com
64.185.132.73	A	rtnewman.net
64.185.132.198	A+PTR	user-10bj166.cable.mindspring.com
64.185.132.242	PTR	user-10bj17i.cable.mindspring.com
64.185.133.33	A+PTR	user-10bj191.cable.mindspring.com
64.185.133.45	A+PTR	user-10bj19d.cable.mindspring.com
64.185.133.48	A+PTR	user-10bj19g.cable.mindspring.com
64.185.133.54	A+PTR	user-10bj19m.cable.mindspring.com
64.185.133.58	A+PTR	user-10bj19q.cable.mindspring.com
64.185.133.63	A+PTR	user-10bj19v.cable.mindspring.com
64.185.133.68	A+PTR	user-10bj1a4.cable.mindspring.com
64.185.133.69	A+PTR	user-10bj1a5.cable.mindspring.com
64.185.133.78	A+PTR	user-10bj1ae.cable.mindspring.com
64.185.133.81	A+PTR	user-10bj1ah.cable.mindspring.com
64.185.133.86	A+PTR	user-10bj1am.cable.mindspring.com
64.185.133.92	A+PTR	user-10bj1as.cable.mindspring.com
64.185.133.102	A+PTR	user-10bj1b6.cable.mindspring.com
64.185.133.133	A+PTR	user-10bj1c5.cable.mindspring.com
64.185.133.141	A+PTR	user-10bj1cd.cable.mindspring.com
64.185.133.150	A+PTR	user-10bj1cm.cable.mindspring.com
64.185.133.154	A+PTR	user-10bj1cq.cable.mindspring.com
64.185.133.211	A+PTR	user-10bj1ej.cable.mindspring.com
64.185.134.165	A+PTR	user-10bj1l5.cable.mindspring.com
64.185.134.254	PTR	user-10bj1nu.cable.mindspring.com