sensors Mode-S transponder

39D2A9

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HUVJ · AIRBUS A-350-900

Hex
39D2A9
Octal
16351251
Decimal
3,789,481
Country
FR
Tail
F-HUVJ
Type
A359
Broadcasting now · callsign AFR029 · 41,000 ft
Flights observed
7
Distinct callsigns
2
Country
FR
Last broadcast
19h ago

Current position

39D2A9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 39D2A9 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 2 distinct

Callsign Airline Flights Last seen
AFR028 - 6 2026-04-13
AFR029 - 1 2026-04-14

Recent flights last 7

DateFlightRouteTakeoffLandingDuration
2026-04-14 AFR029 - Apr 14, 05:15 UTCApr 14, 05:45 UTC30m
2026-04-13 AFR028 - Apr 13, 18:05 UTCApr 13, 18:40 UTC35m
2026-04-13 AFR028 - Apr 13, 04:20 UTCApr 13, 04:50 UTC30m
2026-04-13 AFR028 - Apr 13, 03:55 UTCApr 13, 04:50 UTC55m
2026-04-13 AFR028 - Apr 13, 00:20 UTCApr 13, 04:15 UTC3h 55m
2026-04-12 AFR028 - Apr 12, 23:55 UTCApr 13, 03:50 UTC3h 55m
2026-04-12 AFR028 - Apr 12, 17:50 UTCApr 12, 19:15 UTC1h 25m

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-HUVJ page for operator, model, and routing details .

Mode-S 39D2A9 frequently asked

What is Mode-S code 39D2A9?
39D2A9 is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HUVJ.
Where is Mode-S 39D2A9 registered?
Mode-S code 39D2A9 is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39D2A9 broadcasting right now?
Yes. Mode-S 39D2A9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39D2A9, octal 16351251, decimal 3,789,481.
What flights does 39D2A9 operate?
Mode-S 39D2A9 has broadcast 2 distinct callsigns, including AFR028, AFR029.