Robtex

Up: 66.243.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 66.243.64.0/20
Down right: 66.243.80.0/20

IP	Type	Hostname
66.243.70.0	PTR	66-243-70-0.pingtone.net
66.243.72.241	A	dflat.webrelay.net
66.243.74.122	A	admin2.stpetersolney.org
66.243.75.120	A	exchange.sgim.org
66.243.75.120	A	emailsql.sgim.org
66.243.76.3	PTR	hillsborough.k12.nj.us
66.243.76.150	A	barracuda.hemnet.com
66.243.78.190	A	crossfield.webrelay.net
66.243.80.1	PTR	66-243-80-1.focaldata.net
66.243.80.2	PTR	66-243-80-2.focaldata.net
66.243.80.7	A	mailgate.mvminc.com
66.243.80.32	PTR	66-243-80-32.focaldata.net
66.243.80.33	PTR	66-243-80-33.focaldata.net
66.243.80.34	PTR	66-243-80-34.focaldata.net
66.243.80.65	PTR	66-243-80-65.focaldata.net
66.243.80.67	PTR	66-243-80-67.focaldata.net
66.243.80.96	PTR	66-243-80-96.focaldata.net
66.243.80.97	PTR	66-243-80-97.focaldata.net
66.243.80.98	PTR	66-243-80-98.focaldata.net
66.243.80.128	PTR	66-243-80-128.focaldata.net
66.243.80.129	PTR	66-243-80-129.focaldata.net
66.243.80.130	PTR	66-243-80-130.focaldata.net
66.243.80.160	PTR	66-243-80-160.focaldata.net
66.243.80.161	PTR	66-243-80-161.focaldata.net
66.243.80.163	PTR	66-243-80-163.focaldata.net
66.243.80.192	PTR	66-243-80-192.focaldata.net
66.243.80.193	PTR	66-243-80-193.focaldata.net
66.243.80.194	PTR	66-243-80-194.focaldata.net
66.243.80.195	PTR	66-243-80-195.focaldata.net
66.243.80.224	PTR	66-243-80-224.focaldata.net
66.243.80.225	PTR	66-243-80-225.focaldata.net
66.243.80.226	PTR	66-243-80-226.focaldata.net
66.243.81.194	A	mail.microtech-us.net
66.243.81.194	A	mail.microtech-solutions.us
66.243.81.194	A	mail.microtech-solutions.net
66.243.83.100	A	pharaon.dai.com
66.243.88.128	PTR	66-243-88-128.focaldata.net
66.243.88.163	PTR	66-243-88-163.focaldata.net
66.243.95.160	PTR	66-243-95-160.focaldata.net