In Windows 10 (once you connect) you just go to Settings / Network & Internet / click on the SSID name and scroll down to Properties.
It tells you the band, protocol, channel, security type, and all that good stuff.
This works only on Windows 10 Anniversary Update (version 1607) and up.
on windows commandline:
netsh wlan show interfaces
See Radio Type and Channel
For Windows 11:
- Open Settings
- Go to Network & internet
- Tap Properties
- Scroll down and you will see the network band and channel
It doesn’t show the width or how many channels you’re using right now, only the control channel. In my case I’m actually using channels 36 through 64 (160 MHz). For more detailed info I’d recommend Acrylic Wi-Fi Home.
Windows 10 Home:
Network settings> wifi> advanced options
System information> Components> Network> Adapter> scroll down to wireless section