Apparatus

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sensors Mode-S transponder

399A63

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HGTD · PIPSTREL Virus

Hex
399A63
Octal
16315143
Decimal
3,775,075
Country
FR
Tail
F-HGTD
Type
PIVI
No current signal · last broadcast 1d ago
Flights observed
26
Distinct callsigns
1
Country
FR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 399A63.

Country allocation

The ICAO 24-bit address 399A63 falls within the block assigned to France (FR) by ICAO Annex 10, Volume III. Every aircraft registered in France receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
FHGTD - 26 2026-04-17

Recent flights last 26

DateFlightRouteTakeoffLandingDuration
2026-04-17 FHGTD - Apr 17, 17:25 UTCApr 17, 17:45 UTC20m
2026-04-17 FHGTD - Apr 17, 17:05 UTCApr 17, 17:15 UTC10m
2026-04-17 FHGTD - Apr 17, 16:15 UTCApr 17, 16:30 UTC15m
2026-04-17 FHGTD - Apr 17, 14:10 UTCApr 17, 15:15 UTC1h 4m
2026-04-17 FHGTD - Apr 17, 11:20 UTCApr 17, 12:20 UTC1h 0m
2026-04-17 FHGTD - Apr 17, 10:30 UTCApr 17, 11:15 UTC45m
2026-04-17 FHGTD - Apr 17, 09:20 UTCApr 17, 09:45 UTC25m
2026-04-17 FHGTD - Apr 17, 08:45 UTCApr 17, 09:15 UTC30m
2026-04-17 FHGTD - Apr 17, 07:35 UTCApr 17, 07:45 UTC10m
2026-04-16 FHGTD - Apr 16, 21:14 UTCApr 16, 22:00 UTC45m
2026-04-16 FHGTD - Apr 16, 20:55 UTCApr 16, 21:10 UTC15m
2026-04-16 FHGTD - Apr 16, 19:15 UTCApr 16, 20:20 UTC1h 5m
2026-04-16 FHGTD - Apr 16, 18:55 UTCApr 16, 19:10 UTC15m
2026-04-16 FHGTD - Apr 16, 11:25 UTCApr 16, 13:05 UTC1h 40m
2026-04-16 FHGTD - Apr 16, 09:10 UTCApr 16, 09:54 UTC45m
2026-04-16 FHGTD - Apr 16, 07:24 UTCApr 16, 09:05 UTC1h 40m
2026-04-16 FHGTD - Apr 16, 06:34 UTCApr 16, 06:49 UTC15m
2026-04-16 FHGTD - Apr 16, 05:39 UTCApr 16, 05:54 UTC15m
2026-04-15 FHGTD - Apr 15, 19:05 UTCApr 15, 20:20 UTC1h 15m
2026-04-15 FHGTD - Apr 15, 13:01 UTCApr 15, 14:15 UTC1h 15m
2026-04-15 FHGTD - Apr 15, 11:35 UTCApr 15, 12:01 UTC25m
2026-04-15 FHGTD - Apr 15, 05:20 UTCApr 15, 06:55 UTC1h 35m
2026-04-14 FHGTD - Apr 14, 17:20 UTCApr 14, 18:15 UTC55m
2026-04-14 FHGTD - Apr 14, 15:50 UTCApr 14, 16:30 UTC40m
2026-04-14 FHGTD - Apr 14, 13:55 UTCApr 14, 14:40 UTC45m
2026-04-14 FHGTD - Apr 14, 11:35 UTCApr 14, 12:15 UTC40m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the F-HGTD page for operator, model, and routing details .

Mode-S 399A63 frequently asked

What is Mode-S code 399A63?
399A63 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HGTD.
Where is Mode-S 399A63 registered?
Mode-S code 399A63 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 399A63 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 399A63, octal 16315143, decimal 3,775,075.
What flights does 399A63 operate?
Mode-S 399A63 has broadcast 1 distinct callsign, including FHGTD.