Robtex

Up: 45.58.68.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 45.58.70.0/24
Down right: 45.58.71.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
45.58.70.1	A	dl-client17.dropbox.com
45.58.70.1	A	block-iad.dropbox-dns.com
45.58.70.1	A	dl-client113.dropbox.com
45.58.70.4	A	api-content.dropbox.com
45.58.70.5	A	gslb-dl.dropboxusercontent.com
45.58.70.33	A	dl-client23.dropbox.com
45.58.70.33	A	dl-client66.dropbox.com
45.58.70.33	A	dl-client14.dropbox.com
45.58.70.37	A	block-www.g1.dropbox.com
45.58.71.46	A	iad4c-ra2-7c.sjc.dropbox.com
45.58.71.46	A	gw.pp.dropbox.com
45.58.71.106	A	iad4c-rc2-9c.sjc.dropbox.com