Robtex

Up: 66.245.112.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.245.120.0/22
Down right: 66.245.124.0/22

IP	Type	Hostname
66.245.120.29	A	user-11fau0t.dsl.mindspring.com
66.245.120.218	A	user-11fau6q.dsl.mindspring.com
66.245.120.219	A	user-11fau6r.dsl.mindspring.com
66.245.124.11	A	user-11fav0b.dsl.mindspring.com
66.245.124.73	A	user-11fav29.dsl.mindspring.com
66.245.125.185	A	user-11favdp.dsl.mindspring.com
66.245.126.8	PTR	user-11favg8.dsl.mindspring.com
66.245.127.112	A	user-11favrg.dsl.mindspring.com