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The ICAO flight plan's CODE field in Other Information is where the 6-character hexadecimal code assigned to the Mode-S transponder is entered. This code, linked to the aircraft's registration number, can be found in the FAA Aircraft Registry or the Canadian Civil Aircraft Registry.

Finding the Hex Code:

• FAA Aircraft Registry

  • Visit the FAA Aircraft Registry and search using the aircraft’s registration number.
  • Locate the Mode S Code (base 16 / hex) field under the Aircraft Description section.

• Canadian Civil Aircraft Registry

  • Visit the Canadian Civil Aircraft Registry and search with the registration number.
  • Locate the Mode-S Code (base 16 / hex) under the 24-bit Address section.

Entering the Hex Code in ForeFlight:

1. Open ForeFlight Mobile.
2. Go to the More page.
3. Select Aircraft.
4. Select the aircraft profile.
5. Scroll to the Filing section.
6. Tap Other Information.
7. Enter the hex code in the CODE field.

This code will now be included automatically in the ICAO flight plan when filing with this aircraft profile.