Airspeed or ground speed in ATC communications?

So when ATC tells you do not exceed a certain speed, do they mean in ground speed or air speed? Because I know air speed isn’t visible to ATC. Earlier ATC told me to not exceed 230 kts, do they mean in GS or air speed? Because I don’t want to change my air speed to 230 knots and have the ground speed be higher and then get ghosted. Thank you!

This belongs in #live:atc. Please try and make your title a little more descriptive:)

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It’s always in Airspeed


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