In box community, there is a document about "Configuring A Firewall For Box Applications".
But it is described with FQDN and domain based and there is no description about IP addresses.
But most of Firewall, such as iptables, cisco ASA FW, etc.. use IP addresses for allow access.
Then I find IP addresses within my Nginx log files, which send POST data from Box API.
Next I search that which network the issued IP is belonging and I find it.
Box.com have AS number as AS33011.
The issued IP is included that AS.
So, is it possible to limit IP prefixes in AS33011?
Here is detailed info.