Master Admins can set up IP Address restrictions in the OwnBackup web application, as follows:
Note: You must enter a Subnet Mask. The Subnet Mask can be calculated at: http://www.aboutmyip.com/
If you wish to convert a range of IPs, the following tool is useful in determining the IPv4 conversions: https://www.ipaddressguide.com/cidr . Use the IP Range To CIDR section to convert.