To help protect your privacy, your iPod touch uses a unique private network address, called a media access control (MAC) address, on each Wi-Fi network it joins.
If a network can’t use a private address (for example, to provide parental controls or to identify your iPod touch as authorized to join), you can stop using a private address for that network.
Go to Settings for a network.
Turn Private Address off.
Important: For better privacy, leave Private Address turned on for all networks that support it. Using a private address helps reduce tracking of your iPod touch across different Wi-Fi networks.