Using Airport Admin
Hi,
If you are an administrator to this router, or have access to use the AirPort Admin Utility you can find the WEP key and pass phrase. If you would like the WEP passphrase only and do not have admin access to your router then you can find that in the Keychain utility.
To find the WEP key and pass phrase using the AirPort Admin Utility start by opening it up. I use a nice little application called Quicksilver so its as simple as typing it. Now, just click on the Password button in the top left of the window and up pops your key and passphrase.
Regards,
t