Strange computer appearing in shared in Finder

In Finder, you can see computers in your "shared" column, and lately I see an unknown computer appear named mac002500d1524a.  Does this mean another computer is hooked to my wireless network?  I have seen many people with similar problems but I don't see a definite solution.
I am using Lion OS and Airport Express.

The "computer" that you see in the Finder under SHARED may be another user on one of your computers if they have more than one user. Depending on how your service provider's network operates, you may also see other devices there from time to time.
This does not necessarily mean that another computer is on your network. The way that you will know if another device is on your wireless network is as follows:
Open Macintosh HD > Applications > Utilities > AirPort Utility
Click Manual Setup
Click directly on Wireless Clients (3rd line from the bottom) and a window will open to show the ID of each device that is connected to your wireless network.
If you want to know which device is which, turn off all of your wireless devices, then turn the wireless back on at one device. Jot down the name of the device along with the ID. Then do the same for other wireless devices on your network, one at a time. The idea is to get a list of all your devices. Don't forget iPhones, wireless printers, etc.
Then check for devices again on your network. If you have 3 wireless devices, and you see 4 devices on the wireless network, and one has an ID that you do not recognize, you may have an unwanted guest.

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    Message was edited by: lkrupp

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