Robtex

Up: 66.147.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.147.168.0/23
Down right: 66.147.170.0/23

IP	Type	Hostname
66.147.169.114	PTR	66-147-169-114.focaldata.net
66.147.169.114	A	hampton-inn.edge7.dallas1.level3.net
66.147.169.126	PTR	mail.whitneysmithco.com
66.147.170.2	PTR	mail.tradegroup.com
66.147.170.180	PTR	exchange2.covenantchurch.org
66.147.171.50	A	catchall.extranet.net