Robtex

Up: 45.58.74.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 45.58.74.0/26
Down right: 45.58.74.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
45.58.74.1	A	dl-client94.dropbox.com
45.58.74.1	A	dl-client23.dropbox.com
45.58.74.1	A	dl-client66.dropbox.com
45.58.74.33	A	dl-client23.dropbox.com
45.58.74.33	A	dl-client66.dropbox.com
45.58.74.33	A	dl-client14.dropbox.com
45.58.74.36	A	edge-block-api.dropbox-dns.com