Robtex

Up: 66.224.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.224.136.0/22
Down right: 66.224.140.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.224.137.2	PTR	66-224-137-2.atgi.net
66.224.137.2	A	ns1.sdi.net
66.224.137.4	PTR	66-224-137-4.atgi.net
66.224.137.4	A	ns2.sdi.net
66.224.137.5	A	mail2.sdi.net
66.224.137.10	PTR	mail.1sttier.net
66.224.137.10	A	mail.sdi.net
66.224.137.11	A+PTR	mail.1sttier.net
66.224.137.11	A	cheyne.com
66.224.137.13	A	sdimail.net
66.224.137.17	PTR	66-224-137-17.atgi.net
66.224.137.17	A	ns2.1sttier.net
66.224.137.20	A	www.ier-nv.com
66.224.137.20	A	www.sdi.net
66.224.137.20	A	interlockna.net
66.224.142.50	PTR	mail.tristateltd.com
66.224.142.137	PTR	66-224-142-137.atgi.net
66.224.142.170	PTR	mail.calneva.net
66.224.142.170	A	calneva.net
66.224.142.213	A	interlockna.net
66.224.142.213	A	nvisioninsurance.com
66.224.142.213	A	interlockhardware.net