Robtex

Up: 66.209.84.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.209.85.0/25
Down right: 66.209.85.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.209.85.0	PTR	cust-66.209.85.0.switchnap.com
66.209.85.23	A+PTR	nv-las-dc-vpncl-06-ext.digitalsafe.net
66.209.85.83	A+PTR	massmutual.digitalsafe.net
66.209.85.157	A+PTR	relay01-las-nat.digitalsafe.net
66.209.85.166	A+PTR	ns2.digitalsafe.net
66.209.85.166	A	mail3.zantaz-introspect.com
66.209.85.166	A	mail3.autonomycloud.com
66.209.85.172	A	smtp-doi.digitalsafe.net
66.209.85.173	A	smtp2-doi.digitalsafe.net
66.209.85.173	A	doi.digitalsafe.net
66.209.85.178	PTR	cust-66.209.85.178.switchnap.com
66.209.85.178	A	pgn.digitalsafe.net
66.209.85.179	A+PTR	dsmail.pgn.digitalsafe.net
66.209.85.239	A+PTR	smtp3-schwab-las.digitalsafe.net