Unknown

It might have been asked before but what does unknown mean on ATC radar

It’s usually caused by a connection issue on the other side.
Best option for you as a controller is to work around them to the best of your ability. That’s what we do on the Expert Server.

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Thanks…I don’t want my pilots to think I’m ignoring them

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I know, it’s a pain when it happens. Fortunately the amount of Unknowns seems to have decreased lately… hopefully it’ll continue and the problem will disappear.

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For some reason it only seems to be happening with like the Cessna planes for me all the big boys are taken care of

Unknowns will show as the Cessna/ light aircraft Logo. You can judge aircraft type by speed/altitude

Make some good screenshots though, in case you get questions later from a pilot who wondered why nobody would reply to him.

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MaxSez: Unknowns could also be an Alfa/Beta Test Flight. FDS Flight Testing of new models is done clandestinely.

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Naah, almost true.
We would show up with an Unknown aircraft, but our callsigns & display names would show up :)

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