MAC address filtering on my Airport router

By using the AirPort Utility, as follows:

• Run the AirPort Utility, select the AirPort base station, and then, select Edit.
• Select the Network tab
• Click on Timed Access Control
• You can disable MAC filtering by disabling Time Access Control.

MAC Address filtering is NOT enabled on your AirPort router.....unless.....you set up individual detailed "rules" for wireless devices that specified the times in which each device would be allowed to connect to the network.

In other words, if you did this, you would know it. Did you do this?