Question : Latest IOS for my CISCO 2500 Router

I have the following IOS:
IOS (tm) 3000 Software (IGS-DR-L), Version 11.1(22), Release Software (fc1)

I beleive the newest IOS for this is 12.3?  Is this correct, or does this change depending on what feature set I have?

Thanks for the help!

Answer : Latest IOS for my CISCO 2500 Router

2500s probably can run up to 12.1, 12.2, or perhaps 12.3.  You'd likely need a RAM upgrade to run that code, and you might want to evaluate whether you really need to upgrade to that code though.