Robtex

Up: 72.0.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.0.96.0/20
Down right: 72.0.112.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.0.109.151	PTR	lucasgroup.com
72.0.109.170	PTR	roko.earthplaza.com
72.0.109.171	PTR	roko.com
72.0.109.198	PTR	novahigh.com
72.0.111.8	A	mail.mediationtracker.com
72.0.111.9	A	dispatch1.steppstowing.com
72.0.111.9	A	mail.ribelin.org
72.0.111.10	A	mail.skytelligent.com
72.0.111.36	A	kvm.iglobalnetworks.com
72.0.111.36	A	iglobalnetworks.com
72.0.111.36	A	mail.isportsmen.com
72.0.111.38	PTR	smtp1.debartolodevelopment.com
72.0.111.39	PTR	cp.cheapguys.com
72.0.111.66	A	mail.tampabayhealth.org
72.0.111.69	A	mail.robertekeller.com
72.0.111.71	A	mail.wflcoc.com
72.0.111.75	A	mail.winspeed.com
72.0.111.89	A	segersipe.com
72.0.111.99	A	mail.iglobalnetworks.org
72.0.111.99	A	mail.iglobalnetworks.us
72.0.111.99	A	iglobalnetworks.org
72.0.111.116	A	mail.wflcoc.com
72.0.111.116	A	mail.holefly.com
72.0.111.118	A	qualifiedrepresentative.com
72.0.111.131	A	mail.gppmc.com
72.0.111.135	A	mail.holefly.com
72.0.111.135	A	mail.timeshareadvisormagazine.com
72.0.111.136	A	ns1.cai2.com
72.0.111.171	A	mail.smartmailmarketing.com
72.0.111.171	A	thecitygentlemensclub.com
72.0.111.171	A	qualifiedrepresentative.com
72.0.111.200	PTR	mail.mixcat.com
72.0.111.207	A	done4youplus.com
72.0.111.207	A	segersipe.com
72.0.111.208	A	smtp.prelicensecoursehawaii.com
72.0.111.210	PTR	zhost1.iglobalnetworks.com
72.0.111.210	A	homebasetoolbox.com
72.0.111.224	A	smtp.spiritofhumanityaward.com
72.0.111.233	A	racerpress.com
72.0.111.233	A	*.racerpress.com
72.0.111.233	A	atvriders.com
72.0.112.36	A	ns2.ghitis.ws
72.0.112.36	A	*.ghitis.ws
72.0.112.36	A	ns1.ghitis.ws
72.0.112.62	A	ns1.usaeast.magnadns.com
72.0.121.66	A	hegangel.dyndns.org