The IP range of H5P service

Hi all,

In my organization, there is a firewall to restrict the HTTP connection to the H5P server. We would like to apply the firewall rule to release connections to specific IPs of H5P. But after releasing the connection to h5p.org, we still experience the blocking when users try to get the shared content. How can we get the complete IP range of the H5P service for configuring the firewall? 

Merlin