The payment platform sends a callback with the payment outcome to the online service. The reply with the request processing outcomes is sent to the product owner’s internet service. IP address ranges, or netblocks, are groups of associated IP addresses. They are usually represented as a base IP handle, followed by a slash, after which a netmask which represents what number of IP addresses are contained inside the netblock. This format is called CIDR. You’ll also generally see netblocks given as a start ip address, and an end ip handle, or an ip tackle range.