if its numbers and letters I would say they usually go for lower end of 3 figures in $. If there is something special about that domain it may make it worth more, however online auto appraisals are notoriously unreliable.
There are actually a surprising amount of 4 character letter and number combinations available out there and while they tend to garner a decent price when sold they are not to everyone's tastes so can sometimes sit around a while before selling.
4 letter domains are generally worth much more however and tend to sell quite quickly.