Robtex

Up: 66.21.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 66.21.128.0/20
Down right: 66.21.144.0/20

IP	Type	Hostname
66.21.131.36	A	adsl-66-21-131-36.clt.bellsouth.net
66.21.138.70	A	adsl-66-21-138-70.clt.bellsouth.net
66.21.147.2	PTR	adsl-66-21-147-2.clt.bellsouth.net
66.21.148.52	A	adsl-66-21-148-52.clt.bellsouth.net