[@robkk Moderator 11 years, 10 months ago]

its the ip address of the current user

to know for sure search this in google: whats my ip address?

and then it should show it there

the ip addresses only show for admin users

its there so you can ban the users that are spam , human/bots

you can ban them using WordPress comment blacklist in settings>discussion

bbPress uses some of those settings too.

use this css to remove it.

span.bbp-author-ip {
    display: none !important;
}