Your 8th has an address right? Let's say you want to connect with `naddr1abc`. As part of the `naddr` whoever sent you that link had to insert the `wss://ip4` as the `relay` field inside the naddr. This means that even if you have never seen this relay before, you have a base IP to connect and start the work. 

But keep in mind that NNS are designed to be broadcasted just like NIP-65 events are. They should be everywhere. But if they are not, you can always have a base IP from the latest relay hints in the events you already have.