Fuzzing tool: Mutate integer within predefined range?

I am newbie to fuzzing tools, and basically, I would like to use fuzzing tool to test a specific function.

Essentially, this function has three input parameter, and each parameter is a number, with range 0 to 0xffff.

I would like to use a fuzzing tool to generate random input combinations, and test the target function. However, I tried zzuf, but find that it does not have a specific setting on mutating integer value..

So I am looking for a fuzzer, that supports to only mutate integer value, within a predefined range? Could anyone give me some help on this issue? Am I clear enough? Thank you.