Sync and cloud storage
*.dropboxusercontent.com
Hosts under dropboxusercontent.com, such as dl.dropboxusercontent.com and dl-eu.dropboxusercontent.com, are on Dropbox's list of verified domains.
Short answer
A Dropbox domain on its list of verified domains, with hosts such as dl.dropboxusercontent.com.
Block with care
Blocking them can break Dropbox downloads, shared links and syncing. Dropbox doesn't document each host's role.
- Matches
*.dropboxusercontent.com
A name with *. covers every name under it: *.push.apple.com matches 1-courier.push.apple.com.
What it serves
Dropbox's help lists dl.dropboxusercontent.com, dl-eu.dropboxusercontent.com and *.dl-eu.dropboxusercontent.com among the verified domains that you usually don't see in your browser's address bar.
The names point to downloads, but Dropbox doesn't describe what each host serves.
Dropbox doesn't say which features use each host. It recommends allowing its domain names in a firewall.
Processes that use it
What breaks if you block it
Block with care
Blocking them can break Dropbox downloads, shared links and syncing. Dropbox doesn't document each host's role.
What breaks if you block it
- Downloads from Dropbox, including shared links, may fail.
- Syncing in the desktop app may fail.
With Kilobat Pro and the network filter, you can block a host for every app or for one app: in Connections, select a connection and choose Block. Apple’s own services are never blocked by Kilobat’s Protection lists.
Sources
- Dropbox Help: What official domains does Dropbox use?
- Dropbox Help: How to allow firewall and security permissions for the Dropbox desktop app
Checked on 1 November 2026.