It does not work on EI Capitan 10.11.6?

[TsinghuaDatabaseGroup]

I tried several times. I clams to associate with the bssid. But it did not.

[FancyQian]

Yes, my 2.4G and 5G use same ssid, although I specific a bssid, but my OS still associate other one.

[Moorviper]

Works absolutely fine on el capitan

did you run the app with sudo ?

[alex-laties]

airport-bssid does definitely work on 10.13 High Sierra. The trick though is that the results from option-click on the WiFi icon are cached and incorrect after running airport-bssid and connecting to a new BSSID.

To check that you have connected to the desired BSSID, you can do the following:

~> cd /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/
~> ./airport -I | grep BSSID

[qpSHiNqp]

Same as #7. Let's discuss there.