Robtex

Up: 66.115.220.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.115.221.0/25
Down right: 66.115.221.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.115.221.0	A+PTR	0.221.115.66.static.sdncommunications.com
66.115.221.2	PTR	2.221.115.66.static.sdncommunications.com
66.115.221.4	A+PTR	mail.firstpremier.com
66.115.221.4	A	mail.fprem.com
66.115.221.4	A	mx10.rushmoreservicecenter.com
66.115.221.5	PTR	cust.108959.sdnet.net
66.115.221.5	A	5.221.115.66.static.sdncommunications.com
66.115.221.6	A+PTR	securemail.firstpremier.com
66.115.221.18	A+PTR	18.221.115.66.static.sdncommunications.com
66.115.221.18	A	fpbvpn.net
66.115.221.50	A+PTR	50.221.115.66.unassigned.sdncommunications.com
66.115.221.50	A	ag.mypremieraccess.com
66.115.221.51	A+PTR	51.221.115.66.unassigned.sdncommunications.com
66.115.221.51	A	myfpbaccess.com
66.115.221.51	A	ag.myfpbaccess.com
66.115.221.52	A+PTR	52.221.115.66.unassigned.sdncommunications.com
66.115.221.52	A	fpbvpn.net
66.115.221.52	A	www.fpbvpn.net
66.115.221.66	PTR	cust.108959.sdnet.net
66.115.221.142	A+PTR	142.221.115.66.unassigned.sdncommunications.com
66.115.221.142	A	preferredpremier.net
66.115.221.142	A	premierpreferred.com