Private serves, Also known as Xatech or iXat, is servers that you can go and create as many accounts possible without getting introuble. You also are able to get things cheaper/free then what you could obtain on normal Xat. Although the private servers were closed several times for copyright, they keep coming back but the most popular one that has never been shut down is iXat.io. Although, Private aren't as popular anymore as they once were in the past. Most ixats shut down after a month due to their inability to maintain a proper server, or have funds to pay for the server's.
Link to iXat: http://ixat.io/ which has the 100% functions, and features as those on xat.com