WAR Renown Rank shows a character's renown rank progress.
Go to http://realmwar.warhammeronline.com and perform a Character Search for your Character. When you find your character, click on his/her name to go to the character sheet. In the URL, the Character ID is the number directly after '?id='
ie. https://realmwar.warhammeronline.com/realmwar/CharacterInfo.war?id=1&server=122 The Character ID is '1'.