Robtex

Up: 72.236.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.236.64.0/22
Down right: 72.236.68.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.236.65.4	A+PTR	ns2-tlh.infinity-software.com
72.236.65.8	A	ns1-tlh.infinity-software.com
72.236.65.32	A+PTR	barracuda.infinity-mail.net
72.236.65.32	A+PTR	barracuda1.infinity-mail.net
72.236.65.32	A+PTR	barracuda2.infinity-mail.net
72.236.65.35	A	ms2.infinity-software.com
72.236.65.45	A+PTR	rest.slaw.isd-stagenet.com
72.236.65.45	A	littlecypresspreserve.com
72.236.65.46	A	isd-testnet.com
72.236.65.57	A	mail.fcatexplorer.com
72.236.65.76	A+PTR	infinity-software.com
72.236.65.76	PTR	apps.infinity-software.com
72.236.65.76	PTR	employees.infinity-software.com
72.236.65.90	PTR	www.surpluslinesautomation.com
72.236.65.90	PTR	beta.slasuite.com
72.236.65.90	A+PTR	cap.infinity-software.com
72.236.65.112	A	infinity-mail.net
72.236.65.113	A	wpdev.designfarm.com
72.236.65.118	A+PTR	gsficsp.infinity-software.com
72.236.65.125	PTR	aaanfstage.isd-stagenet.com
72.236.65.125	A+PTR	barnettfronczakbarlowestage.isd-stagenet.com
72.236.65.125	PTR	benefitadvisorstage.isd-stagenet.com
72.236.66.93	PTR	se-1-1-0-17-1.car1.tallahassee2.level3.net
72.236.67.139	A+PTR	mail.altrua.com
72.236.67.139	A	mail.altruamarketing.com
72.236.67.140	A	*.altrua.com
72.236.67.140	A	altrua.com
72.236.67.154	PTR	mail.duntoole.com
72.236.68.50	A	mail.ford-transmission.com
72.236.68.50	A	mail.man-trans.net
72.236.68.50	A	mail.mantrans.net
72.236.68.146	PTR	mail.southernfl.com
72.236.68.243	PTR	mail.altrua.com
72.236.68.244	PTR	www.altrua.com
72.236.68.244	A	wave94.com
72.236.68.244	A	magnoliahorsefarm.com
72.236.69.36	PTR	dn01.beceng.com
72.236.69.37	PTR	dn02.beceng.com
72.236.69.39	PTR	becconsult.com
72.236.69.39	PTR	becind.com
72.236.69.39	PTR	becserv.com
72.236.69.162	PTR	mail.facc.org
72.236.70.20	PTR	mail.williams-communications.com
72.236.70.20	A	williams-communications.com
72.236.70.213	PTR	ounce.org
72.236.70.222	PTR	mail.ounce.org
72.236.70.234	A	netsatonline.net
72.236.70.240	PTR	gk1.360sip.com