Robtex

Up: 72.237.112.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.237.112.0/22
Down right: 72.237.116.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.237.117.9	PTR	srvr1.xodus-is.com
72.237.117.15	PTR	mx.bodamer.com
72.237.117.55	A+PTR	mx.cronincom.com
72.237.117.68	PTR	mail.netaganza.com
72.237.117.101	PTR	mail.secure-enterprise.com
72.237.117.108	A	ns1.secure-enterprise.com
72.237.117.108	A	ns3.secure-enterprise.com
72.237.117.108	A	ns2.secure-enterprise.com
72.237.117.198	A	mercury.self-help.org
72.237.117.225	PTR	vlan175.car1.raleigh1.level3.net
72.237.117.227	A	mail.careanywhere.com
72.237.117.228	A	shipmanfamilycare.com
72.237.117.228	A	familysolutionshomecare.com
72.237.117.228	A	aaahomecarenc.com
72.237.117.236	A	mail.sembracare.net
72.237.117.236	A	mail.sembrafax.com
72.237.117.238	A	mail.bigboomraleigh.com
72.237.117.238	A	mail.precious-hands.com
72.237.117.243	A	smed1.com
72.237.117.244	PTR	mail.ddasoft.com
72.237.117.244	PTR	mail.sembracare.com
72.237.117.244	A	sembranet.us
72.237.117.251	A	webmail.sembra1.com
72.237.117.252	A	nctracksbilling.com
72.237.119.3	A+PTR	ns3.inetspace.net
72.237.119.3	A	ns.thecompendium.net
72.237.119.4	A	qnais.com
72.237.119.6	A+PTR	ns1.inetspace.net
72.237.119.9	A+PTR	ns2.inetspace.net
72.237.119.34	PTR	owa.linkconnector.com
72.237.119.40	PTR	mx01-mailgw.pointclick.net
72.237.119.41	PTR	mx02-mailgw.pointclick.net
72.237.119.55	A	akhancomputers.com
72.237.119.61	PTR	vm-pbx.ralbusctr.com
72.237.119.67	PTR	us.elster.com
72.237.119.68	A	joab.elsterus.com
72.237.119.69	A	elsterelectricity.com
72.237.119.111	A	elstersecurecollect.com