Robtex

Up: 66.80.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.80.72.0/22
Down right: 66.80.76.0/22

IP	Type	Hostname
66.80.73.67	PTR	spamfilter.hwnn.com
66.80.73.69	A	alabamatrialattorneys.com
66.80.74.40	PTR	ip-66-80-74-40.iad.megapath.net
66.80.75.204	A	ip-66-80-75-204.iad.megapath.net
66.80.75.209	A+PTR	ip-66-80-75-209.iad.megapath.net
66.80.76.163	A	ip-66-80-76-163.iad.megapath.net
66.80.76.166	A	quickprintcenter.com
66.80.77.154	A	mx02.comptonduling.com
66.80.77.154	A	webmail.comptonduling.com
66.80.78.29	A	ip-66-80-78-29.iad.megapath.net
66.80.78.235	A	ip-66-80-78-235.iad.megapath.net
66.80.79.34	A+PTR	ip-66-80-79-34.iad.megapath.net
66.80.79.146	A	ip-66-80-79-146.iad.megapath.net