To find the MAC addresses for Hydrow, use the following steps:
1. Tap the settings icon (the gear icon in the lower right)
2. Select "About This Hydrow"
3. Scroll to the very bottom to find a MAC address listing for both the Wi-Fi and Ethernet adapters.
If you are whitelisting these addresses in an Enterprise Network or setting up MAC Address Filtering on a home network, It is best to add both of these MACs to the list just to be safe.