Robtex

Up: 173.199.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 173.199.4.0/25
Down right: 173.199.4.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
173.199.4.15	A	builds.citrixonlinecdn.com
173.199.4.16	A	logging.citrixonline.com
173.199.4.19	A	mobile.p5.osdimg.com
173.199.4.19	A	ats.osdimg.com
173.199.4.19	A	l1.osdimg.com
173.199.4.25	A	push.citrixonline.com
173.199.4.27	A	authentication.citrixonline.com
173.199.4.27	A	authentication.iad.expertcity.com
173.199.4.34	PTR	joingototraining.com
173.199.4.34	PTR	gotoassist.de
173.199.4.34	PTR	gotomeeting.de
173.199.4.35	A	bbuilds.citrixonlinecdn.com
173.199.4.36	A	bbuilds.getgocdn.com
173.199.4.44	PTR	buildscdn-iad.getgocdn.com
173.199.4.44	A	builds.getgocdn.com
173.199.4.47	A	authentication.logmeininc.com
173.199.4.53	A+PTR	marketing.logmeininc.com
173.199.4.64	A+PTR	api.openvoice.com
173.199.4.65	A+PTR	hidefcorporate.com
173.199.4.65	A	global.openvoice.com
173.199.4.70	A	logging.getgo.com
173.199.4.71	A	availability.getgo.com