Very young humans do not understand the concept of object permanence. They actually think you’re gone, when they can’t see you. That is also why you can sometimes see little children closing their eyes, when they are playing hide and seek.
I don’t quite get what the point is. No matter how good you encrypt the server name, the destination IP address will always be visible. Are there that many webservers sharing the same IP, that this makes a noticeable impact? Am I missing something?
QR codes are just an encoding. Just use any half-competent QR code app, and it will give you it’s content, which you can then write down. For the reverse you can use any QR code generator.