The latest skyBeacon application should derive your ICAO from your callsign.

If you'd like to enter it manually or look up your ICAO use the following process:

1.  Visit  https://registry.faa.gov/aircraftinquiry/NNum_Inquiry.aspx

2.  Enter your n-number (callsign) in the search box.

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3.  Locate your ICAO also know as the MODE-S CODE (base 16/hex)  on the results page and enter it into the skyBeacon application.