[coffeeri]

It is good that this does not work. As one IP might be shared by multiple accounts. A cache of the mapping IP --> AccountNo is also not favorable in terms of privacy.

[piaste]

> As one IP might be shared by multiple accounts.

No "might" about it, that's one of the most important traits of this type of service.

[coffeeri]

Yes indeed, but it's not guaranteed that there'll be multiple clients connected to one server at a time, even if it's unlikely.