Apparatus

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sensors Mode-S transponder

3F551D

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to 15+02 · AIRBUS A-319

Hex
3F551D
Octal
17652435
Decimal
4,150,557
Country
DE
Tail
15+02
Type
A319
No current signal · last broadcast 7h ago
Flights observed
60
Distinct callsigns
16
Country
DE
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 3F551D.

Country allocation

The ICAO 24-bit address 3F551D 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 16 distinct

Callsign Airline Flights Last seen
GAF866 - 8 2026-05-07
GAF833 - 7 2026-05-12
GAF816 - 6 2026-05-19
GAF811 - 5 2026-05-22
GAF853 - 4 2026-05-29
GAF848 - 4 2026-06-02
GAF840 - 4 2026-05-05
GAF701 - 4 2026-04-28
GAF861 - 3 2026-04-13
GAF851 - 3 2026-05-27
GAF830 - 3 2026-05-09
GAF732 - 3 2026-05-26
GAF852 - 2 2026-05-28
GAF801 - 2 2026-04-17
GAF893 - 1 2026-05-18
GAF862 - 1 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 GAF848 - Jun 2, 11:00 UTCJun 2, 11:50 UTC50m
2026-06-01 GAF848 - Jun 1, 13:00 UTCJun 1, 16:40 UTC3h 40m
2026-06-01 GAF848 BER → LCA Jun 1, 07:30 UTCJun 1, 10:55 UTC3h 25m
2026-06-01 GAF848 CGN → BER Jun 1, 04:55 UTCJun 1, 05:45 UTC50m
2026-05-29 GAF853 LBG → CGN May 29, 14:40 UTCMay 29, 15:25 UTC45m
2026-05-29 GAF853 CGN → LBG May 29, 07:30 UTCMay 29, 08:30 UTC1h 0m
2026-05-28 GAF852 - May 28, 15:10 UTCMay 28, 16:35 UTC1h 25m
2026-05-28 GAF852 CGN → TLS May 28, 09:05 UTCMay 28, 14:05 UTC5h 0m
2026-05-27 GAF851 TLS → CGN May 27, 14:10 UTCMay 27, 15:45 UTC1h 35m
2026-05-27 GAF851 HAM → TLS May 27, 11:30 UTCMay 27, 13:25 UTC1h 55m
2026-05-27 GAF851 CGN → HAM May 27, 09:35 UTCMay 27, 10:15 UTC40m
2026-05-26 GAF732 NUE → CGN May 26, 14:50 UTCMay 26, 15:24 UTC35m
2026-05-26 GAF732 - May 26, 12:20 UTCMay 26, 13:54 UTC1h 35m
2026-05-26 GAF732 - May 26, 09:25 UTCMay 26, 10:54 UTC1h 30m
2026-05-22 GAF811 BER → CGN May 22, 19:25 UTCMay 22, 20:15 UTC50m
2026-05-22 GAF811 PRG → BER May 22, 18:10 UTCMay 22, 18:40 UTC30m
2026-05-22 GAF811 - May 22, 13:30 UTCMay 22, 14:35 UTC1h 5m
2026-05-21 GAF811 - May 21, 13:50 UTCMay 21, 14:35 UTC45m
2026-05-21 GAF811 CGN → BER May 21, 11:20 UTCMay 21, 12:10 UTC50m
2026-05-20 GAF862 CGN → CGN May 20, 08:25 UTCMay 20, 10:30 UTC2h 5m
2026-05-19 GAF816 BER → CGN May 19, 16:15 UTCMay 19, 17:00 UTC45m
2026-05-19 GAF816 LBG → BER May 19, 14:05 UTCMay 19, 15:25 UTC1h 20m
2026-05-19 GAF816 CGN → LBG May 19, 11:10 UTCMay 19, 12:05 UTC55m
2026-05-18 GAF893 CGN → CGN May 18, 10:35 UTCMay 18, 16:05 UTC5h 30m
2026-05-18 GAF816 LBG → CGN May 18, 07:50 UTCMay 18, 08:45 UTC55m
2026-05-18 GAF816 BER → LBG May 18, 05:15 UTCMay 18, 06:40 UTC1h 25m
2026-05-17 GAF816 CGN → BER May 17, 12:40 UTCMay 17, 13:31 UTC50m
2026-05-12 GAF833 BER → CGN May 12, 16:05 UTCMay 12, 16:55 UTC50m
2026-05-12 GAF833 VNO → BER May 12, 14:10 UTCMay 12, 15:20 UTC1h 10m
2026-05-11 GAF833 - May 11, 12:30 UTCMay 11, 13:20 UTC50m
2026-05-11 GAF833 - May 11, 10:10 UTCMay 11, 11:25 UTC1h 15m
2026-05-11 GAF833 - May 11, 08:00 UTCMay 11, 08:40 UTC40m
2026-05-11 GAF833 - May 11, 04:55 UTCMay 11, 05:50 UTC55m
2026-05-11 GAF833 CGN → BER May 11, 02:35 UTCMay 11, 03:20 UTC45m
2026-05-09 GAF830 - May 9, 09:10 UTCMay 9, 10:00 UTC50m
2026-05-09 GAF830 BER → OBF May 9, 07:10 UTCMay 9, 08:00 UTC50m
2026-05-09 GAF830 CGN → BER May 9, 04:35 UTCMay 9, 05:25 UTC50m
2026-05-07 GAF866 - May 7, 09:10 UTCMay 7, 13:10 UTC4h 0m
2026-05-06 GAF866 - May 6, 07:10 UTCMay 6, 09:50 UTC2h 40m
2026-05-05 GAF840 - May 5, 13:40 UTCMay 5, 14:50 UTC1h 10m
2026-05-04 GAF840 ATH → BER May 4, 16:30 UTCMay 4, 19:00 UTC2h 31m
2026-05-04 GAF840 HAM → ATH May 4, 05:20 UTCMay 4, 08:10 UTC2h 50m
2026-05-03 GAF840 CGN → HAM May 3, 11:15 UTCMay 3, 11:55 UTC40m
2026-04-29 GAF866 BER → CGN Apr 29, 14:50 UTCApr 29, 15:35 UTC45m
2026-04-29 GAF866 CGN → BER Apr 29, 11:55 UTCApr 29, 12:50 UTC55m
2026-04-29 GAF866 - Apr 29, 09:35 UTCApr 29, 10:20 UTC45m
2026-04-29 GAF866 CGN → BER Apr 29, 07:50 UTCApr 29, 08:40 UTC50m
2026-04-28 GAF701 - Apr 28, 19:35 UTCApr 28, 20:30 UTC55m
2026-04-28 GAF701 - Apr 28, 16:25 UTCApr 28, 18:40 UTC2h 15m
2026-04-27 GAF701 - Apr 27, 17:10 UTCApr 27, 20:00 UTC2h 50m

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+02 page for operator, model, and routing details .

Mode-S 3F551D frequently asked

What is Mode-S code 3F551D?
3F551D is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to 15+02.
Where is Mode-S 3F551D registered?
Mode-S code 3F551D is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3F551D broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3F551D, octal 17652435, decimal 4,150,557.
What flights does 3F551D operate?
Mode-S 3F551D has broadcast 16 distinct callsigns, including GAF866, GAF833, GAF816, GAF811, GAF853.