Robtex

Up: 66.56.80.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.56.81.0/25
Down right: 66.56.81.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.56.81.17	A+PTR	mail.adk4684-ns.com
66.56.81.17	A	mail.vmvrewards.com
66.56.81.17	A	ns1.vmvrewards.com
66.56.81.18	PTR	adk4684-ns.com
66.56.81.18	A	tech-virtu.com
66.56.81.18	A	vrewardsorder.com
66.56.81.209	A	mail.itvendoroffer.com
66.56.81.209	A	ns1.itvendoroffer.com
66.56.81.210	A	maxitvendzspin.com
66.56.81.210	A	itvendortothemax.com
66.56.81.210	A	localitvendornews.com