Robtex

Up: 72.54.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.54.8.0/23
Down right: 72.54.10.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.54.8.74	A+PTR	72-54-8-74.customerip.birch.net
72.54.8.74	A	mail.glenfieldcapital.com
72.54.8.90	PTR	mail.bellamystrickland.net
72.54.8.90	A+PTR	72-54-8-90.customerip.birch.net
72.54.8.110	PTR	mail.shacpa.com
72.54.8.122	A	mail.hensoncook.com
72.54.8.138	A	mailx.chesleybrown.info
72.54.8.138	A	mailx.incommandworldwide.org
72.54.8.138	A	mailx.incommandworldwide.com
72.54.8.171	PTR	schillinghc.com
72.54.8.171	A+PTR	72-54-8-171.customerip.birch.net
72.54.8.171	A	mail.schillinghc.com
72.54.8.202	A	mail.adcockassociates.com
72.54.8.202	A	mail.vandressercompany.com
72.54.8.202	A	server01.adcockassociates.com
72.54.9.5	A+PTR	72-54-9-5.customerip.birch.net
72.54.9.20	PTR	mail.brownbagmarketing.net
72.54.9.20	A+PTR	72-54-9-20.customerip.birch.net
72.54.9.106	A	capabletrucks.com
72.54.9.180	PTR	72-54-9-180.customerip.birch.net
72.54.9.180	A	ngcars-jcr-ma1.northgeorgiacolonandrectal.com
72.54.9.194	A	pkfc.org
72.54.9.194	A	pkfresearch.com
72.54.9.194	A	mail.pkfresearch.com
72.54.9.210	PTR	b2b.b2btech.com
72.54.9.210	PTR	72-54-9-210.customerip.birch.net
72.54.9.210	A	b2bdemos.com
72.54.9.212	PTR	b2btech.com
72.54.9.212	A+PTR	72-54-9-212.customerip.birch.net
72.54.9.221	A	mailserver1.office365success.info
72.54.9.229	A	mail.gibsonsgrouting.com
72.54.10.2	PTR	remote.leciga.com
72.54.10.2	A+PTR	72-54-10-2.customerip.birch.net
72.54.10.51	PTR	acgpro.com
72.54.10.51	A+PTR	72-54-10-51.customerip.birch.net
72.54.10.66	A+PTR	mail.airmi.com
72.54.10.98	A	mail.briarcliffanimal.com
72.54.10.98	A	mail.thebac.net
72.54.10.99	A	mail.briarcliffanimal.com
72.54.10.99	A	mail.thebac.net
72.54.10.107	A	mail.mcelderrycpa.com
72.54.10.138	PTR	72-54-10-138.customerip.birch.net
72.54.10.138	A	ns2.asdnet.com
72.54.10.140	A+PTR	mail.asdnet.com
72.54.10.140	PTR	72-54-10-140.customerip.birch.net
72.54.10.140	A	asdnet.com
72.54.10.142	PTR	72-54-10-142.customerip.birch.net
72.54.10.142	A	www.atlantisnetworking.com
72.54.10.142	A	ns2.atlantisnetworking.com
72.54.10.162	A	remote.chestneylaw.com
72.54.10.180	A	virtualvms.net
72.54.10.180	A	cormedurgentcare.com
72.54.10.180	A	www.virtualvms.com
72.54.10.181	PTR	nerdherdusa.com
72.54.10.181	PTR	wirenerds.com
72.54.10.181	PTR	jobstalker.net
72.54.10.182	PTR	nerdherdusa.com
72.54.10.182	PTR	wirenerds.com
72.54.10.182	PTR	cor-tech.net
72.54.10.183	PTR	mail.mtpros-inc.com
72.54.10.183	PTR	72-54-10-183.customerip.birch.net
72.54.10.206	A	mail2.cyfordtechnologies.com
72.54.10.229	A	mail.greyparrotgallery.com
72.54.10.229	A	mail.greyparrotbooks.com
72.54.10.230	PTR	allminiparts.com
72.54.10.230	PTR	englishparts.com
72.54.10.230	PTR	mgbsource.com
72.54.10.242	A	gateway.scw.com
72.54.10.243	A+PTR	mail1.scw.com
72.54.10.244	A+PTR	mail2.scw.com
72.54.10.245	A+PTR	eproc.scw.com
72.54.10.246	A	ns3.scw.com
72.54.10.247	A+PTR	shop1.scw.com
72.54.10.248	A+PTR	shop2.scw.com
72.54.10.249	A+PTR	voip1.scw.com
72.54.10.250	A	voip2.scw.com
72.54.10.251	A	xml.scw.com
72.54.10.253	A+PTR	cuda1.scw.com
72.54.10.254	PTR	cuda2.scw.com
72.54.10.254	PTR	mail2.scw.com
72.54.11.1	PTR	mail.moderndevelopments.net
72.54.11.42	A	server.idermed.com
72.54.11.59	PTR	triageconsulting.com
72.54.11.59	PTR	mailatl.triageconsulting.com
72.54.11.59	A+PTR	72-54-11-59.customerip.birch.net
72.54.11.75	A+PTR	72-54-11-75.customerip.birch.net
72.54.11.75	A	ftp.condrives.com
72.54.11.106	A	mail.edificegroup.org
72.54.11.106	A	mail.dealerdatasolutions.com
72.54.11.114	A	americanhermeticsinc.com
72.54.11.133	A	mail.kengregorymusic.net
72.54.11.158	A	mail.tympani.net
72.54.11.158	A	mail.cerebratemarketing.com
72.54.11.222	A	mail.bpequity.com
72.54.11.222	A	mail.brightonpartnersllc.com