Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

38B55D

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-JDKO · SHARK AERO Shark

Hex
38B55D
Octal
16132535
Decimal
3,716,445
Country
FR
Tail
F-JDKO
Type
SHRK
Broadcasting now · callsign FJDKO · 600 ft
Flights observed
5
Distinct callsigns
1
Country
FR
Last broadcast
1h ago

Current position

38B55D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 38B55D 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
FJDKO - 5 2026-07-04

Recent flights last 5

DateFlightRouteTakeoffLandingDuration
2026-07-04 FJDKO - Jul 4, 08:45 UTCJul 4, 09:15 UTC30m
2026-07-03 FJDKO - Jul 3, 15:05 UTCJul 3, 17:30 UTC2h 25m
2026-07-02 FJDKO - Jul 2, 18:15 UTCJul 2, 18:40 UTC25m
2026-06-28 FJDKO - Jun 28, 16:09 UTCJun 28, 16:55 UTC45m
2026-06-27 FJDKO - Jun 27, 17:29 UTCJun 27, 18:15 UTC45m

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

Mode-S 38B55D frequently asked

What is Mode-S code 38B55D?
38B55D is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-JDKO.
Where is Mode-S 38B55D registered?
Mode-S code 38B55D is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 38B55D broadcasting right now?
Yes. Mode-S 38B55D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 38B55D, octal 16132535, decimal 3,716,445.
What flights does 38B55D operate?
Mode-S 38B55D has broadcast 1 distinct callsign, including FJDKO.