[Tigress8780]

We have this thing called NATMap: https://github.com/heiher/natmap

It gives you a public dynamic IP + port combination if your network is NAT1 all the way to the internet. Both IP & port being dynamic kinda complicates things, they ended up inventing a new DNS record type, "IP4P" where IPv4 address and port are encoded as an IPv6 address, and modified WireGuard/OpenVPN clients are required.

We are supposed to solve this using SRV records, but I don't think many consumer-facing apps can do this.