Robtex

Up: 66.32.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.32.16.0/22
Down right: 66.32.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.32.16.57	PTR	static-66-32-16-57.earthlinkbusiness.net
66.32.16.76	A	static-66-32-16-76.earthlinkbusiness.net
66.32.16.169	A	static-66-32-16-169.earthlinkbusiness.net
66.32.16.183	A	user-112045n.dsl.mindspring.com
66.32.16.188	A	user-112045s.dsl.mindspring.com
66.32.16.249	A	user-112047p.dsl.mindspring.com
66.32.17.2	A	static-66-32-17-2.earthlinkbusiness.net
66.32.17.36	A	static-66-32-17-36.earthlinkbusiness.net
66.32.17.92	A	static-66-32-17-92.earthlinkbusiness.net
66.32.17.102	A	static-66-32-17-102.earthlinkbusiness.net
66.32.18.1	A+PTR	static-66-32-18-1.earthlinkbusiness.net
66.32.18.2	A+PTR	static-66-32-18-2.earthlinkbusiness.net
66.32.18.3	PTR	bearsplaygrounds.com
66.32.18.3	PTR	bearsproducts.com
66.32.18.3	PTR	covenanths.com
66.32.18.8	A+PTR	static-66-32-18-8.earthlinkbusiness.net
66.32.18.9	A+PTR	static-66-32-18-9.earthlinkbusiness.net
66.32.18.10	A+PTR	static-66-32-18-10.earthlinkbusiness.net
66.32.18.10	A	fastelements.com
66.32.18.11	PTR	static-66-32-18-11.earthlinkbusiness.net
66.32.18.200	PTR	static-66-32-18-200.earthlinkbusiness.net
66.32.18.200	A	prestodigi.com
66.32.18.200	A	brinkmaninternationalgroup.com
66.32.18.201	PTR	admargroup.com
66.32.18.201	PTR	bigoak.com
66.32.18.201	PTR	connorsandferris.com
66.32.18.202	PTR	static-66-32-18-202.earthlinkbusiness.net
66.32.19.2	A	static-66-32-19-2.earthlinkbusiness.net
66.32.19.3	PTR	static-66-32-19-3.earthlinkbusiness.net
66.32.19.3	A+PTR	www.flarehosting.com
66.32.19.3	A+PTR	flarehosting.com
66.32.19.4	PTR	static-66-32-19-4.earthlinkbusiness.net
66.32.19.4	A	rackwire.com
66.32.19.24	A	user-11204oo.dsl.mindspring.com
66.32.21.2	A	static-66-32-21-2.earthlinkbusiness.net
66.32.21.104	PTR	static-66-32-21-104.earthlinkbusiness.net
66.32.22.58	A	static-66-32-22-58.earthlinkbusiness.net
66.32.22.220	A	static-66-32-22-220.earthlinkbusiness.net
66.32.22.246	A	user-11205nm.dsl.mindspring.com
66.32.22.248	A	user-11205no.dsl.mindspring.com
66.32.23.131	A	user-11205s3.dsl.mindspring.com
66.32.23.149	A	user-11205sl.dsl.mindspring.com