Robtex

Up: 170.138.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 170.138.0.0/20
Down right: 170.138.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
170.138.0.13	PTR	mxrelay01.emdeon.com
170.138.0.32	A	pl-pmlmx001.envoy.net
170.138.0.33	A+PTR	pl-pmlmx002.envoy.net
170.138.0.46	A+PTR	ldmg.emdeon.com
170.138.0.130	PTR	memowa.emdeon.com
170.138.0.131	PTR	memas.emdeon.com
170.138.0.134	A	aeas.emdeon.com
170.138.4.25	PTR	ftp.idcs.emdeon.com.emdeon.com
170.138.16.27	A	zix.chamberlinedmonds.com
170.138.16.28	A	zix.chamberlinedmonds.com
170.138.16.30	A	remoteapps.chamberlinedmonds.com
170.138.16.30	A	webappslabs.chamberlinedmonds.com
170.138.16.30	A	csglabs.chamberlinedmonds.com
170.138.16.42	A	sftp.chamberlinedmonds.com
170.138.16.42	A	secure.chamberlinedmonds.com
170.138.16.42	A	ftp.chamberlinedmonds.com
170.138.16.134	A	paymentintegrity.emdeon.com
170.138.16.135	A	images2.healthclaimonline.com
170.138.16.140	A	docs.healthclaimonline.com
170.138.16.143	A	clients.chamberlinedmonds.com
170.138.16.151	A	aeas.emdeon.com
170.138.16.160	PTR	app.advocatecert.emdeon.com
170.138.16.161	PTR	sync.advocatecert.emdeon.com
170.138.16.162	A+PTR	fvtech.advocatecert.emdeon.com
170.138.16.173	A	providerdirect.partner.findyourdoc.com
170.138.16.173	A	aon-api.partner.findyourdoc.com
170.138.16.183	A	cert.its.emdeon.com
170.138.16.195	A	healthcareu.com
170.138.16.218	A+PTR	assistant.emdeon.com
170.138.16.224	A	providerdirect.findyourdoc.com
170.138.16.224	A	www.findyourdoc.com
170.138.16.224	A	aon-api.findyourdoc.com
170.138.20.2	A+PTR	ldcsa.emdeon.com
170.138.20.53	A+PTR	vhe-na.changehealthcare.com
170.138.20.134	A	ppolcert.ixt.com
170.138.27.34	A	www.mypacs.net
170.138.27.35	A	www.mypacs.net