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 22d ago
Flights observed
87
Distinct callsigns
20
Country
DE
Last broadcast
22d 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 20 distinct

Callsign Airline Flights Last seen
GAF833 - 11 2026-06-25
GAF866 - 8 2026-05-07
GAF893 - 6 2026-06-10
GAF816 - 6 2026-05-19
GAF861 - 5 2026-06-22
GAF817 - 5 2026-06-18
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
GAF851 - 3 2026-05-27
GAF830 - 3 2026-05-09
GAF826 - 3 2026-06-16
GAF732 - 3 2026-05-26
GAF636 - 3 2026-06-12
GAF852 - 2 2026-05-28
GAF832 - 2 2026-06-16
GAF801 - 2 2026-04-17
GAF743 - 2 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-25 GAF833 - Jun 25, 13:59 UTCJun 25, 14:34 UTC35m
2026-06-25 GAF833 - Jun 25, 10:15 UTCJun 25, 10:55 UTC40m
2026-06-25 GAF833 - Jun 25, 05:39 UTCJun 25, 06:25 UTC45m
2026-06-24 GAF833 CGN → BER Jun 24, 09:49 UTCJun 24, 10:55 UTC1h 5m
2026-06-22 GAF861 HAM → CGN Jun 22, 10:05 UTCJun 22, 10:44 UTC40m
2026-06-22 GAF861 CGN → HAM Jun 22, 08:10 UTCJun 22, 08:54 UTC45m
2026-06-18 GAF817 HAM → CGN Jun 18, 19:30 UTCJun 18, 20:10 UTC40m
2026-06-18 GAF817 - Jun 18, 17:05 UTCJun 18, 17:55 UTC50m
2026-06-17 GAF817 - Jun 17, 14:55 UTCJun 17, 16:40 UTC1h 45m
2026-06-17 GAF817 BER → WAW Jun 17, 11:00 UTCJun 17, 11:55 UTC55m
2026-06-17 GAF817 CGN → BER Jun 17, 08:45 UTCJun 17, 09:35 UTC50m
2026-06-16 GAF832 BER → CGN Jun 16, 21:05 UTCJun 16, 22:00 UTC55m
2026-06-16 GAF832 CGN → BER Jun 16, 19:35 UTCJun 16, 20:25 UTC51m
2026-06-16 GAF826 - Jun 16, 16:15 UTCJun 16, 17:00 UTC45m
2026-06-16 GAF826 BER → LBG Jun 16, 13:40 UTCJun 16, 14:55 UTC1h 15m
2026-06-16 GAF826 CGN → BER Jun 16, 11:20 UTCJun 16, 12:10 UTC50m
2026-06-15 GAF754 CGN → CGN Jun 15, 08:35 UTCJun 15, 10:30 UTC1h 55m
2026-06-12 GAF636 - Jun 12, 15:25 UTCJun 12, 15:50 UTC25m
2026-06-12 GAF636 - Jun 12, 13:40 UTCJun 12, 14:25 UTC45m
2026-06-12 GAF636 CGN → BER Jun 12, 11:00 UTCJun 12, 11:50 UTC50m
2026-06-10 GAF893 - Jun 10, 19:00 UTCJun 10, 20:15 UTC1h 15m
2026-06-10 GAF893 - Jun 10, 08:00 UTCJun 10, 09:50 UTC1h 50m
2026-06-09 GAF893 - Jun 9, 08:25 UTCJun 9, 11:50 UTC3h 25m
2026-06-08 GAF893 - Jun 8, 11:20 UTCJun 8, 14:00 UTC2h 40m
2026-06-08 GAF893 - Jun 8, 07:50 UTCJun 8, 10:05 UTC2h 15m
2026-06-03 GAF743 BER → CGN Jun 3, 07:05 UTCJun 3, 07:55 UTC50m
2026-06-03 GAF743 CGN → BER Jun 3, 04:30 UTCJun 3, 05:20 UTC50m
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

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 22d 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 20 distinct callsigns, including GAF833, GAF866, GAF893, GAF816, GAF861.