When using AirPort Admin Utility version 3.3 or earlier, an AirPort Extreme with firmware 5.6 or AirPort Express with firmware 6.2 may appear to have an incorrect IP address that's similar to "254.128.0.0."
The incorrect address appears in the list of base stations before you click Configure. The correct address will appear in the configuration screens.
In Mac OS X 10.3 and later, you can resolve the issue by updating to the latest AirPort software. For instructions, see "Mac OS X: Updating your software."
Users of 10.2.8 and earlier should ignore the incorrect address and click Configure to see the actual address.