Well DNS does not really split this because of the way TCP-connections are defined: The are the pair of IP and Ports of both sides. So TCP-connections are alway

Well DNS does not really split this because of the way TCP-connections are defined: The are the pair of IP and Ports of both sides. So TCP-connections are always between two locations not between two identities. That's the reason why connections get lost when changing from one network to another. Also updating DNS entries is to slow to do it whenever you walk with your smartphone from one cell/wifi to another.