IPv4 household situation: one external IPv4 public address at your router/firewall, 2^16 invisible addresses NATted behind it - streaming service embeds a UUID

IPv4 household situation: one external IPv4 public address at your router/firewall, 2^16 invisible addresses NATted behind it - streaming service embeds a UUID in your client and reports it every time you make a request. IPv6 household situation: 2^64 external addresses at your router/firewall, 1 to N of them remain static so you can get ACK packets from the outside, up to 2^64 -1 of them are randomly reassigned every so often at the mercy of your client OS's privext implementation. Streaming service embeds a UUID in your client and reports it every time you make a request.