A firewall is a component of network security that defines what network traffic is and is not allowed in and out of your enterprise. Firewalls can be configured as extremely as to block all inbound and outbound traffic or to allow all inbound or outbound traffic, but the former makes networking communication impossible and the latter is a significant security risk. More commonly, a firewall is either configured to allow traffic through specific ports except if explicitly blocked, or, for stricter security stances, to block traffic except if explicitly allowed.
Firewalls are configured to allow or block traffic in several ways, including by geographic source, by port, by domain/hostname, and by IP address. Box and Box applications require the traffic to and from specifically defined domains and IP addresses to be allowed through a corporate firewall, as outlined in this topic.
Typically, you would list these domains/hostnames and IP addresses in your firewall's allowlist. See the instructions for your firewall hardware or software for details.
Some Enterprise accounts may need additional specific hostnames beyond what are listed in this topic. If you are using a firewall or proxy such as Forcepoint/Websense or Blue Coat, create a Box Product Support case and request additional hostnames that may be necessary for Enterprise accounts.
Firewall Allowlist Domains/Hostnames and IP Addresses
The following sections list the domains/hostnames and IP addresses that must be allowlisted for Box and Box applications, integrations, and components to function properly.
The core Box application requires the following domains to be allowed.
Use our site's domain names instead of a particular site IP address. IP addresses can change frequently and without notice.
Configure hostnames to recognize any subdomain of:
If you cannot allow the wildcard domains shown in the list above, allow these specific hostnames:
- cdn01.boxcdn.net - cdn20.boxcdn.net
- dl2.boxcloud.com - dl20.boxcloud.com
In addition, enable HTTPS (port 443) for the domains above.
Excel Online Previewer
To use the Excel Online Previewer, you must allow the following specific hostnames:
Box for Office Integration
Box for Microsoft Teams
To use Box for Microsoft Teams, you must allow the following specific hostnames:
To use the Box Captcha feature (used at login), you must allow the following specific hostnames:
Optionally, if using an IP allowlist, be sure to allow the IPs listed on https://www.cloudflare.com/ips/.
Box for Google Workspace
To use the Box for Google Workspace, please go to the Google support pages for the hostnames you must allow. (You can ignore the Google Drive/drive IP addresses because this Box integration does not have a dependency on Google Drive.)
Box for iWork Integration
To use the Box for iWork integration, you must allow access to Apple’s network at 220.127.116.11/8
To use Box Sign, you must allow the following specific hostnames:
Box Support Site and Product Documentation
To log in to our support site to submit a support ticket you must allow:
For all other inbound traffic, you must allow the list of ingress and egress IP addresses found at the following endpoint:
The endpoint doesn’t require authentication. You can copy this URL and paste it into the address bar of any browser. You may want to set up a scheduled request periodically to determine if the IP addresses listed in the request response change.
Creating Allow Lists for Box Zones
If you have configured a firewall, you can allow the following Box Zones domains.
Box Desktop Applications' Proxy Support
Box Drive, Box Sync, Box Tools, Box for Office, and Box Notes Desktop are desktop applications that must connect to Box's data centers to function. The apps utilize the same domains outlined above. The apps detect and use the proxy configured for the local machine via:
- Automatic Proxy Detection
- Proxy Auto-Configuration (PAC file)
- Windows does not support local file path schemas for the .pac file location such as file://C:\proxy.pac. Use a URL to configure the .pac file location.
- Or manually setting the proxy server address for HTTP and HTTPS protocols
For proxy authentication support:
- Windows apps support NTLMv1 or NTLMv2 authentication
- Box for Office, Box Tools (machine-wide build), and Box Sync use a Windows Service that needs to connect to Box's data centers to check for new versions. The Windows Services run as the SYSTEM user, which may be unable to authenticate using NTLM. We recommend allowing SYSTEM run Services to connect through your proxy without authentication.
- Mac apps support NTLMv1 authentication only.
- Basic Authentication is not supported.
Testing Connectivity to Box Domains
To test whether your browser can connect to various Box domains, go to our Connectivity Testing page. Each test image is hosted on a different Box URL.
Configuring Email for Box Notifications