How to tell if Macbook is using 802.11ac I just got a new Macbook Air and a new Airport Extreme, both of which support 802.11ac.

Is there an easy way to tell if my Macbook Air is connecting to the Airport Extreme via 802.11ac?  Relatedly, can I tell if I'm connecting at 5GHz band or 2.4GHz band?

I've already done a speedtest, and the results are inconclusive.
When you're connected to the Wi-Fi network, hold down option and click the Wi-Fi icon in the OS X menubar. You'll see additional details about your connection, including one item labelled PHY Mode:. That will show you whether you're connected via 802.11ac, n, g, etc.



There's also a Channel: entry that tells you the radio frequency and channel.