Robtex

Up: 66.84.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.84.76.0/23
Down right: 66.84.78.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.84.76.124	A	brickbybrickinc.com
66.84.76.124	A	acanthuspublishing.com
66.84.76.124	A	ns1.ictusdev.com
66.84.76.236	A	dielectrictech.biz
66.84.76.236	A	dielectrictechnologies.biz
66.84.78.50	A	mail.myvl.com
66.84.78.51	A+PTR	ns.myvl.com
66.84.78.52	A+PTR	ns1.myvl.com
66.84.78.53	A	web.myvl.com
66.84.78.54	A	webmaster.myvl.com
66.84.78.54	A	*.myvl.com
66.84.78.57	A+PTR	mysql01.myvl.com
66.84.78.58	A	pgsql.myvl.com
66.84.79.21	PTR	www.langco.net
66.84.79.113	A	hosting79-113.visuallink.com