Web app and Magento Web Store Connector

Hi,

When I do an "Add Magento Web Store" in the web version of the ShipRush application, I am asked to fill out 5 fields:

FTP server
FTP user name
FTP Password

Magento Web Services User Name
Magento Web Services API Key

I have all of these values and I have them working with a ShipRush desktop installation; however, I cannot complete the setup on the web version of ShipRush because of a firewall issue:

My company allows only known-good IP addresses to connect via FTP. From what IP (or range of IPs) will ShipRush's servers be connecting to our FTP server?

Once I know this information, I can allow ShipRush to connect and use the web app.

Thanks for your help on this issue.

Regards,
Sam