Robtex

Up: 64.30.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 64.30.32.0/20
Down right: 64.30.48.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.30.32.10	PTR	mail.airsmail.com
64.30.32.10	A	careersatbankers.com
64.30.32.10	A	mail.careersatbankers.com
64.30.32.11	PTR	smtp.airscorp.com
64.30.32.15	A	mx1.airscorp.com
64.30.32.61	PTR	airsengage.com
64.30.32.61	PTR	airstalentpoint.com
64.30.32.61	PTR	mail.airsatmosphere.com
64.30.32.88	PTR	vole.airscorp.com
64.30.32.169	PTR	spamrejector.kbavt.com
64.30.34.211	A+PTR	mail.portermedical.org
64.30.34.212	A	mail1.portermedical.org
64.30.34.254	PTR	mail.portermedical.org
64.30.35.30	A	hackettandcompany.com
64.30.35.68	PTR	spamrejector.dinse.com
64.30.36.102	A	www.mps.k12.vt.us
64.30.36.102	A	mps.k12.vt.us
64.30.36.145	PTR	hartfordsd.com
64.30.36.145	PTR	mail.hartfordsd.com
64.30.36.180	A	yourtownweb.com
64.30.36.184	PTR	mail.terracecommunities.net
64.30.37.26	A	spamfilter.sbschools.net
64.30.37.28	A	mailsrvr.sbschools.net
64.30.37.34	A+PTR	amp.sbschools.net
64.30.37.51	A	trackitsrvr.sbschools.net
64.30.37.90	A	chamberlin.sbschools.net
64.30.37.90	A	central.sbschools.net
64.30.37.90	A	fhtms.sbschools.net
64.30.37.100	PTR	wfr.sbschools.net
64.30.37.101	A	vtacad.com
64.30.37.101	A	sbeavt.org
64.30.37.102	A+PTR	wfrmobile.sbschools.net
64.30.37.104	A	saml.sbschools.net
64.30.37.145	A	ns2.sbschools.net
64.30.37.250	A	virtualoffice.sbschools.net
64.30.37.252	A	firewall.sbschools.net
64.30.37.254	A	level3.sbschools.net
64.30.39.34	A	mail.chroma.com
64.30.39.35	A+PTR	doc.chroma.com
64.30.39.35	A	heliophor.net
64.30.39.40	A	mail.opticalfilters.com
64.30.39.137	A+PTR	mail.sbtinsurance.com
64.30.39.147	PTR	mx02.landmark.edu
64.30.39.194	PTR	exchange.nchsi.org
64.30.39.197	PTR	exchange.nchsi.org
64.30.39.215	A	mail.nchsi.org
64.30.39.216	A	autodiscover.nchsi.org
64.30.39.216	A	exchange2010.nchsi.org
64.30.41.195	PTR	mail.vtmechanical.com
64.30.41.195	A	mail.vermontmechanical.com
64.30.41.195	A	smtp.vermontmechanical.com
64.30.41.203	PTR	net3.cbavt.com
64.30.42.34	PTR	willieracine.com
64.30.42.34	A	mailto.willieracine.com
64.30.44.34	PTR	mail.northcountry.org
64.30.44.37	PTR	mail.northcountry.org
64.30.46.3	A+PTR	spamrejector.vsac.org
64.30.46.10	A+PTR	services.vsac.org
64.30.46.12	A+PTR	secureacctaccess.vsac.org
64.30.46.18	A+PTR	spamrejector2.myvsac.info
64.30.46.52	A	mailer.emailvsac.org
64.30.46.52	A	emailvsac.org
64.30.46.134	PTR	vsac3.vsac.org
64.30.46.189	A	vjv.vsac.org
64.30.47.10	A	server1.skystratus.com
64.30.47.11	A	server2.skystratus.com
64.30.47.130	PTR	c-64-30-47-130.clearbearing.net
64.30.48.20	A	mail.svmta.com
64.30.48.20	A	svmta.com
64.30.49.10	PTR	ns1.4lane.com
64.30.49.27	A	ashrae.com
64.30.49.59	PTR	enews.4lane.com
64.30.49.67	A+PTR	mail.wblake.com
64.30.49.78	PTR	wblake.com
64.30.49.98	PTR	mail2.sburl.com
64.30.49.146	PTR	mail.burrburton.org
64.30.52.224	PTR	wireless-burke-ccu3-29-88.kingdomwireless.net
64.30.54.42	A	mx0.gmcr.com
64.30.54.65	A+PTR	campaigns.keurig.com
64.30.54.149	A	mymail.keurig.com
64.30.54.172	PTR	smtp101.gmcr.com
64.30.54.172	PTR	smtp101.keurig.com
64.30.54.172	PTR	smtp101.vanhoutte.com
64.30.54.173	A+PTR	smtp1.gmcr.com
64.30.54.173	PTR	smtp1.keurig.com
64.30.54.173	A+PTR	smtp1.vanhoutte.com
64.30.54.225	A	gmcrcup-public.gmcr.com
64.30.55.202	PTR	webmail.winooski.k12.vt.us
64.30.59.66	A+PTR	vpn.vermontmutual.com
64.30.59.69	A+PTR	smtp.vermontmutual.com
64.30.59.72	A	vermontmutualgroup.com
64.30.59.72	A	www.vermontmutual.com
64.30.61.48	A	agingnetwork.net