Robtex

Up: 165.212.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 165.212.64.0/19
Down right: 165.212.96.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
165.212.64.1	PTR	address01.mbox.net
165.212.64.7	A	esload02.eservices.usa.net
165.212.64.8	A+PTR	esmail01.mbox.net
165.212.64.9	A	esmail02.mbox.net
165.212.64.9	A	emd2.mbox.net
165.212.64.79	A	per5-mail-demo2.sys.perimeterusa.com
165.212.64.87	A	postin03.mbox.net
165.212.64.89	A	gws5.mbox.net
165.212.64.89	A	gwsin05.mbox.net
165.212.64.151	A	cf-1.usa.net
165.212.64.152	A	cf-2.usa.net
165.212.64.153	A	cf-3.usa.net
165.212.64.161	A	pp1.usa.net
165.212.65.10	A+PTR	transfer.usa.net
165.212.65.18	A	escrowdb.mailsafe.usa.net
165.212.65.100	A+PTR	gwsin.mbox.net
165.212.65.101	A+PTR	esmaext.mbox.net
165.212.65.102	PTR	gwsmtp.ct.mbox.net
165.212.65.102	A	mail.rgtruck.com
165.212.65.102	A	gwsmtp.usa.net
165.212.65.140	A	clicktime.cloud.postoffice.net
165.212.65.142	A	linksecurity.ual.com
165.212.65.200	A	dnsext04.usa.net
165.212.65.209	A+PTR	unity-ui.mbox.net
165.212.65.209	A	cloud.postoffice.net
165.212.65.209	A	cloud.perimeterusa.com
165.212.66.37	A	ptapp-prod1.adminportal.com
165.212.66.228	A	insync.silversky.com
165.212.80.22	A	exchange.csmbakerysolutions.com
165.212.80.23	A	autodiscover.bakemark.com
165.212.80.23	A	autodiscover.d2.csmbakerysolutions.com
165.212.80.23	A	autodiscover.exchange.csmbakerysolutions.com
165.212.80.37	A	autodiscover.d3.postoffice.net
165.212.80.87	A	connect.scusamail.com
165.212.80.110	A	d1p7failback.united.com
165.212.80.110	A	mail2.united.com
165.212.80.234	A	exchange.us.ai.baesystems.com
165.212.81.15	A	exchange.cloud.perimeterusa.com
165.212.81.16	A	autodiscover.cloud.perimeterusa.com
165.212.81.220	A	exchange.postoffice.net
165.212.81.220	A	s1p7array.postoffice.net
165.212.81.220	A	owa.postoffice.net
165.212.81.221	A	autodiscover.f1-enterprises.com
165.212.96.214	A	radar-c.silversky.com
165.212.96.217	A	xoradar.xo.com
165.212.96.218	A	xowebvpn.xo.com
165.212.98.5	A	exchange.cloud.perimeterusa.com
165.212.98.5	A	mail.streetmktg.com
165.212.98.5	A	mail.coloradokitchens.com
165.212.98.7	A	autodiscover.cloud.perimeterusa.com
165.212.98.18	PTR	sip.mbox.net
165.212.98.20	A	sp.mbox.net
165.212.99.5	A	exchange.cloud.perimeterusa.com
165.212.99.5	A	mail.streetmktg.com
165.212.99.7	A	autodiscover.cloud.perimeterusa.com
165.212.99.20	A	sp.mbox.net
165.212.99.34	PTR	mx-wdc.sl1.mbox.net
165.212.100.72	A	mx.rd2orl.net
165.212.100.120	A	mx.exorl.net
165.212.100.249	A+PTR	mx.exorl.usa.net
165.212.101.11	A	lulu.dev.usa.net
165.212.101.151	A	stesmail.test.usa.net
165.212.101.171	A	mullen.postoffice.net
165.212.109.69	A	smtpfeed01.seccas.com
165.212.109.83	A	dns01-nyc.seccas.com
165.212.109.87	A	archive.seccas.com
165.212.109.89	A	compliance.seccas.com
165.212.109.160	A+PTR	smtpfeed02.seccas.com
165.212.109.189	A	archiveadmin.silversky.com
165.212.116.97	A	esweeper.messagesonline.net
165.212.116.202	A+PTR	e12.usa.net
165.212.116.220	A	email.mbox.net
165.212.116.235	A	mail2.ual.com
165.212.116.238	A	ualsharepoint.usa.net
165.212.117.20	A	autodiscover.bakemark.com
165.212.117.20	A	autodiscover.d2.csmbakerysolutions.com
165.212.117.20	A	autodiscover.exchange.csmbakerysolutions.com
165.212.117.21	A	exchange.csmbakerysolutions.com
165.212.117.72	A	sp.portal.oregon.usa.net
165.212.117.87	A	connect.scusamail.com
165.212.117.90	A	scusamail.com
165.212.117.110	A	mail.united.com
165.212.117.137	A	autodiscover.d3.postoffice.net
165.212.117.144	A	provisor.iapws.com
165.212.118.10	A	exchange.us.ai.baesystems.com
165.212.120.50	A	lyncab.postoffice.net
165.212.120.70	A	lync.postoffice.net
165.212.120.72	A	skypeav.postoffice.net
165.212.120.72	A	lyncav.postoffice.net
165.212.120.73	A	skypeweb.postoffice.net
165.212.120.97	PTR	expw.postoffice.net
165.212.120.121	A	autodiscover.f1-enterprises.com
165.212.120.156	A	corpx.sp.postoffice.net
165.212.120.160	PTR	terracareassociates.sp.postoffice.net
165.212.120.160	A	netbankaudit.sp.postoffice.net
165.212.120.160	A	sp.postoffice.net
165.212.120.162	A+PTR	firstcomcu.sp.postoffice.net
165.212.120.200	A	exchange.postoffice.net
165.212.120.200	A	owa.postoffice.net
165.212.120.200	A	mail.niederhoffer.net
165.212.120.224	A	exchange.cloud.perimeterusa.com
165.212.120.225	A	autodiscover.cloud.perimeterusa.com
165.212.126.1	A+PTR	secure.fnbn.com
165.212.126.3	A	mail.fnbn.com
165.212.127.4	A	backlundinvestment.com