Robtex

Up: 204.13.88.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 204.13.90.0/24
Down right: 204.13.91.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.13.90.12	PTR	getusersettings.protectedtrust.com
204.13.90.12	A	ingramleedy.com
204.13.90.20	A	ns1.eosafari.com
204.13.90.21	A	ns2.eosafari.com
204.13.90.48	A+PTR	autodiscover.sso.us.elephantoutlook.com
204.13.90.50	A+PTR	portal.us.elephantoutlook.com
204.13.90.50	A	barracuda.csihro.com
204.13.90.50	A	mail.raine.com
204.13.90.51	PTR	autodiscover.us.elephantoutlook.com
204.13.90.52	PTR	cpe-204-13-90-52.waltham.ma.naviga.us
204.13.90.52	A	smtp.brguestinc.com
204.13.90.52	A	inbound30.us.elephantoutlook.com
204.13.90.53	PTR	cpe-204-13-90-53.walthan.ma.naviga.us
204.13.90.53	A	smtp.brguestinc.com
204.13.90.53	A	inbound10.us.elephantoutlook.com
204.13.90.54	A+PTR	inbound30.us.elephantmx.com
204.13.90.62	A+PTR	mx.us.elephantoutlook.com
204.13.90.62	A	smtp.brguestinc.com
204.13.90.62	A	inbound10.us.elephantoutlook.com
204.13.90.63	A	mx.us.elephantoutlook.com
204.13.90.116	A+PTR	ftp-secure.us.elephantoutlook.com
204.13.90.131	A	lyncdiscover.us.elephantoutlook.com
204.13.90.163	PTR	elephantoutlook.com
204.13.90.163	A+PTR	blog.protectedtrust.com
204.13.90.163	A	fbccwh.net
204.13.90.200	PTR	cpe-204-13-90-200.waltham.ma.naviga.us
204.13.90.200	A	smtp.protectedtrust.com
204.13.90.201	A+PTR	protectedtrust.com
204.13.90.201	A	app-wh.protectedtrust.com
204.13.90.202	A	ws-wh.protectedtrust.com
204.13.90.202	A	ws.protectedtrust.com
204.13.90.203	A	www.safelive.com
204.13.90.203	A	*.safelive.com
204.13.90.204	A+PTR	mx.us.elephantoutlook.com
204.13.90.205	A+PTR	mx.us.elephantoutlook.com
204.13.90.206	A	mx.us.elephantoutlook.com