UltraBan

This ban plugin is great for small - medium sized servers. Simply because it adds many features, such as /ultraban ban (time), /ultraban lookup, and /ultraban unban. There are many more features, and they can be found within the config. Each ban gets an 8 letter string of numbers for ban, and on the ban screen, there are alot of important details for appealing and the ban reason, including who banned the player.