One use scenario of CGN has been labeled as NAT444, because some customer connections to Internet services on the public Internet would pass through three different IPv4 addressing domains: the customer's own private network, the carrier's private network and the public Internet.
CGN的一种使用场景可以描述为NAT444，因为一些客户与公共服务器的连接将通过三个不同的IPv4寻址域：客户自己的私有网络，运营商的私有网络，以及公共互联网。