Thread:Project:Support desk/What will happen if I rename a user to an IP address?/reply (2)

MediaWiki internally stores the information whether a user, who was logged in, did an action, or if the user had not been logged in. With this criterion it should still be possible to differentiate whether an edit was done by that according user account or by an IP user.

Anyway, IP addresses are not considered acceptable user names for MediaWiki. It will be possible to confuse a username, which is an IP address, with a user with the actual IP address. For example the links pointing to the contribution pages of a user/IP address will look the same for both the IP address and the user account, which has the name of that IP address.

A username of 127.0.0.1 also is misleading as it points to the actual server, not a user, doing an action.

en:Wikipedia:Naming_conventions_(technical_restrictions) makes me think that it is technically impossible to give user accounts such names. Even if it was technically possible, I would not give users user names, which also are IP addresses (among them 127.0.0.1).