Apparatus

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sensors Mode-S transponder

3F97FD

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to 15+04 · AIRBUS A-321

Hex
3F97FD
Octal
17713775
Decimal
4,167,677
Country
DE
Tail
15+04
Type
A321
Photo of 15+04
No current signal · last broadcast 15h ago
Flights observed
6
Distinct callsigns
2
Country
DE
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 3F97FD.

Country allocation

The ICAO 24-bit address 3F97FD falls within the block assigned to Germany (DE) by ICAO Annex 10, Volume III. Every aircraft registered in Germany 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
GAF891 - 5 2026-04-13
GAF893 - 1 2026-04-14

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-14 GAF893 - Apr 14, 09:20 UTCApr 14, 11:05 UTC1h 45m
2026-04-13 GAF891 - Apr 13, 12:20 UTCApr 13, 12:55 UTC35m
2026-04-13 GAF891 - Apr 13, 11:55 UTCApr 13, 12:55 UTC1h 0m
2026-04-13 GAF891 - Apr 13, 08:20 UTCApr 13, 12:15 UTC3h 55m
2026-04-13 GAF891 - Apr 13, 07:55 UTCApr 13, 11:50 UTC3h 55m
2026-04-13 GAF891 - Apr 13, 07:40 UTCApr 13, 08:15 UTC35m

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 15+04 page for operator, model, and routing details .

Mode-S 3F97FD frequently asked

What is Mode-S code 3F97FD?
3F97FD is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to 15+04.
Where is Mode-S 3F97FD registered?
Mode-S code 3F97FD is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3F97FD broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3F97FD, octal 17713775, decimal 4,167,677.
What flights does 3F97FD operate?
Mode-S 3F97FD has broadcast 2 distinct callsigns, including GAF891, GAF893.