Robtex

Up: 71.81.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 71.81.16.0/22
Down right: 71.81.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
71.81.16.0	PTR	071-081-016-000.biz.spectrum.com
71.81.16.131	A	mail.atlantamotorspeedway.com
71.81.17.5	A	71-81-17-5.static.gwnt.ga.charter.com
71.81.17.22	A	71-81-17-22.static.gwnt.ga.charter.com
71.81.17.43	A+PTR	71-81-17-43.static.gwnt.ga.charter.com
71.81.17.67	A+PTR	71-81-17-67.static.gwnt.ga.charter.com
71.81.17.86	A	71-81-17-86.static.gwnt.ga.charter.com
71.81.17.99	A+PTR	71-81-17-99.static.gwnt.ga.charter.com
71.81.17.100	A	71-81-17-100.static.gwnt.ga.charter.com
71.81.17.169	A+PTR	71-81-17-169.static.gwnt.ga.charter.com
71.81.17.203	A+PTR	71-81-17-203.static.gwnt.ga.charter.com
71.81.17.206	A	71-81-17-206.static.gwnt.ga.charter.com
71.81.17.243	A+PTR	71-81-17-243.static.gwnt.ga.charter.com
71.81.18.28	A	71-81-18-28.static.gwnt.ga.charter.com
71.81.18.30	A	71-81-18-30.static.gwnt.ga.charter.com
71.81.18.90	A	harrisgroup.org
71.81.18.91	A+PTR	71-81-18-91.static.gwnt.ga.charter.com
71.81.18.143	A	71-81-18-143.static.gwnt.ga.charter.com
71.81.18.160	A+PTR	71-81-18-160.dhcp.gwnt.ga.charter.com
71.81.18.252	A	outlook.fireflybuys.com
71.81.19.6	A	71-81-19-6.static.gwnt.ga.charter.com
71.81.19.10	PTR	71-81-19-10.static.gwnt.ga.charter.com
71.81.19.10	A	davidr3deitrick.com
71.81.19.10	A	londo.centauricw.com
71.81.19.34	A	71-81-19-34.dhcp.gwnt.ga.charter.com
71.81.19.178	PTR	71-81-19-178.static.gwnt.ga.charter.com
71.81.19.178	A	3dpartz.com
71.81.19.178	A	techbusinesscenter.com
71.81.20.2	PTR	71-81-20-2.static.gwnt.ga.charter.com
71.81.20.78	A	mail.hallatlaw.com
71.81.20.132	A	mail.healthstatrx.com
71.81.20.179	PTR	parkerandassociates.com
71.81.20.179	A	mail.pamgt.com
71.81.20.252	A	mail.aics-inc.com
71.81.21.2	A	71-81-21-2.static.gwnt.ga.charter.com
71.81.21.14	A	dpsserver.net
71.81.21.40	PTR	scimail-atl.scicompanies.com
71.81.21.98	A+PTR	mail.crossroadsconnect.com
71.81.21.98	A	crossroadsconnect.com
71.81.21.99	A	www.12stone.church
71.81.21.115	A+PTR	71-81-21-115.static.gwnt.ga.charter.com
71.81.21.250	PTR	ctnrd.com
71.81.22.14	A	71-81-22-14.static.gwnt.ga.charter.com
71.81.22.18	PTR	71-81-22-18.static.gwnt.ga.charter.com
71.81.22.55	A	71-81-22-55.static.gwnt.ga.charter.com
71.81.22.82	A	71-81-22-82.static.gwnt.ga.charter.com
71.81.22.90	A	imail.aec2020.net
71.81.22.209	A	mail.legacyelectrical.com
71.81.22.221	A	71-81-22-221.static.gwnt.ga.charter.com
71.81.23.2	PTR	71-81-23-2.static.gwnt.ga.charter.com