Robtex

Up: 66.162.52.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 66.162.52.0/24
Down right: 66.162.53.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.162.52.2	PTR	fsnns1.fullservice.net
66.162.52.2	PTR	66.162.52.2.gen.fullservice.net
66.162.52.2	A	test.recoveryctr.org
66.162.52.4	PTR	autodiscover.fullservice.net
66.162.52.4	PTR	66.162.52.4.gen.fullservice.net
66.162.52.4	A	mail.fullservice.net
66.162.52.5	A	harley.fullservice.net
66.162.52.7	A	www.redworldwide.net
66.162.52.7	A	lenox.fullservice.net
66.162.52.20	A+PTR	fsnns2.fullservice.net
66.162.52.20	A+PTR	ns2.fullservice.net
66.162.52.20	PTR	66.162.52.20.gen.fullservice.net
66.162.52.24	PTR	66.162.52.24.gen.fullservice.net
66.162.52.24	A	rrs.fullservice.net
66.162.52.25	A	support.fullservice.net
66.162.52.51	PTR	66.162.52.51.gen.fullservice.net
66.162.52.55	PTR	barracuda.fullservice.net
66.162.52.55	PTR	spamgate.fullservice.net
66.162.52.55	A	spammarker2.fullservice.net
66.162.52.57	A+PTR	5.fsn-central.com
66.162.52.57	PTR	66.162.52.57.gen.fullservice.net
66.162.52.69	A	rrs.fullservice.net
66.162.52.200	A+PTR	fsnvdi.fullservice.net
66.162.52.200	PTR	66.162.52.200.gen.fullservice.net
66.162.53.21	A	duboischemical.com
66.162.53.21	A	dubois-paper.com
66.162.53.35	A	*.rgoodenterprises.com
66.162.53.35	A	mail.rgoodenterprises.com
66.162.53.56	A	lwmadvisors.com
66.162.53.57	PTR	66.162.53.57.gen.fullservice.net
66.162.53.57	A	mail.lenoxwealth.com
66.162.53.57	A	lenoxwealth.com
66.162.53.64	A	mail.jtdinc.com
66.162.53.110	A	mail.taaginc.com
66.162.53.125	A+PTR	mail.biorx.net
66.162.53.125	A	wm.biorx.net
66.162.53.160	PTR	66.162.53.160.gen.fullservice.net
66.162.53.160	A	mail.forgelumber.com
66.162.53.160	A	mail.forgebuildingmaterials.com