Thread:Project:Support desk/What will happen if I rename a user to an IP address?/reply (3)

I finally have this conclusion:

It should technically be impossible to rename user accounts to IP address names. We already see that e.g. the contribution page cannot differentiate properly between both, if an account had an IP address name. Since the developers have spent time in making it impossible to rename accounts that way, I think it is currently not possible to say whether there additionally to other issues, whether there will also be security problems arising from such a renaming. Until now the "solution" for that was to forbid the according renaming, not to solve the security issue. So if not even the often-used contribs page cannot handle IP user names properly, then we definitely cannot say that it would by secure to use those. We just don't know.

So you can do the following: See, if you can rename the user accordingly and if that is possible report it as a bug with unknown security implication to the bugtracker!