Apparatus

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sensors Mode-S transponder

3C4A21

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-ABQA · DE HAVILLAND DHC-8-400 Dash 8

Hex
3C4A21
Octal
17045041
Decimal
3,951,137
Country
DE
Tail
D-ABQA
Type
DH8D
No current signal · last broadcast 3h ago
Flights observed
85
Distinct callsigns
18
Country
DE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 3C4A21.

Country allocation

The ICAO 24-bit address 3C4A21 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 18 distinct

Callsign Airline Flights Last seen
DLH471 Lufthansa 14 2026-05-27
DLH470 Lufthansa 13 2026-05-27
DLH753 - 10 2026-06-13
DLH500 Lufthansa 6 2026-06-15
DLH761 Lufthansa 5 2026-05-31
DLH760 Lufthansa 5 2026-05-31
DLH478 Lufthansa 5 2026-06-17
DLH752 Lufthansa 4 2026-06-13
DLH501 - 4 2026-06-15
DLH7JF Lufthansa 3 2026-06-12
DLH479 Lufthansa 3 2026-06-11
DLH107 Lufthansa 3 2026-06-12
DLH797D Lufthansa 2 2026-06-03
DLH796 Lufthansa 2 2026-06-02
DLH6EE Lufthansa 2 2026-05-23
DLH4MW Lufthansa 2 2026-05-23
DLH4XK Lufthansa 1 2026-06-12
DLH2PV Lufthansa 1 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-17 DLH478 FRA → YUL Jun 17, 12:40 UTCJun 17, 14:30 UTC1h 50m
2026-06-15 DLH501 - Jun 15, 19:30 UTCJun 16, 06:35 UTC11h 5m
2026-06-15 DLH500 MUC → GIG Jun 15, 07:35 UTCJun 15, 07:50 UTC15m
2026-06-14 DLH500 MUC → GIG Jun 14, 20:40 UTCJun 15, 06:49 UTC10h 9m
2026-06-13 DLH753 - Jun 13, 12:20 UTCJun 14, 07:05 UTC18h 46m
2026-06-13 DLH752 FRA → HYD Jun 13, 11:35 UTCJun 14, 07:05 UTC19h 31m
2026-06-12 DLH2PV HAM → FRA Jun 12, 18:10 UTCJun 12, 19:00 UTC50m
2026-06-12 DLH4XK FRA → HAM Jun 12, 15:40 UTCJun 12, 16:30 UTC50m
2026-06-12 DLH107 MUC → FRA Jun 12, 12:25 UTCJun 12, 13:05 UTC40m
2026-06-12 DLH7JF FRA → LHR Jun 12, 10:40 UTCJun 12, 11:20 UTC40m
2026-06-11 DLH479 YUL → FRA Jun 11, 22:40 UTCJun 12, 05:00 UTC6h 21m
2026-06-11 DLH478 FRA → YUL Jun 11, 13:05 UTCJun 11, 20:20 UTC7h 15m
2026-06-10 DLH753 HYD → FRA Jun 10, 12:20 UTCJun 11, 07:30 UTC19h 10m
2026-06-10 DLH752 FRA → HYD Jun 10, 11:50 UTCJun 11, 07:30 UTC19h 40m
2026-06-08 DLH753 HYD → FRA Jun 8, 12:20 UTCJun 9, 07:20 UTC19h 0m
2026-06-08 DLH753 HYD → FRA Jun 8, 11:40 UTCJun 9, 07:20 UTC19h 40m
2026-06-07 DLH753 HYD → FRA Jun 7, 12:20 UTCJun 8, 06:55 UTC18h 35m
2026-06-07 DLH752 FRA → HYD Jun 7, 11:25 UTCJun 8, 06:55 UTC19h 30m
2026-06-06 DLH479 YUL → FRA Jun 6, 22:30 UTCJun 7, 04:55 UTC6h 25m
2026-06-06 DLH478 - Jun 6, 13:25 UTCJun 6, 20:00 UTC6h 35m
2026-06-06 DLH478 - Jun 6, 13:05 UTCJun 6, 13:20 UTC15m
2026-06-05 DLH479 YUL → FRA Jun 5, 22:45 UTCJun 6, 05:00 UTC6h 15m
2026-06-05 DLH478 - Jun 5, 12:50 UTCJun 5, 19:50 UTC7h 0m
2026-06-04 DLH753 HYD → FRA Jun 4, 12:20 UTCJun 5, 06:55 UTC18h 35m
2026-06-04 DLH752 FRA → HYD Jun 4, 11:30 UTCJun 5, 06:55 UTC19h 25m
2026-06-03 DLH797D HKG → FRA Jun 3, 07:15 UTCJun 3, 14:45 UTC7h 30m
2026-06-03 DLH797D HKG → FRA Jun 3, 02:00 UTCJun 3, 02:15 UTC15m
2026-06-02 DLH796 FRA → HKG Jun 2, 23:20 UTCJun 2, 23:55 UTC35m
2026-06-02 DLH796 FRA → HKG Jun 2, 12:55 UTCJun 2, 16:35 UTC3h 40m
2026-05-31 DLH761 DEL → FRA May 31, 22:10 UTCJun 1, 06:05 UTC7h 55m
2026-05-31 DLH760 FRA → DEL May 31, 12:55 UTCMay 31, 19:50 UTC6h 55m
2026-05-29 DLH761 DEL → FRA May 29, 21:55 UTCMay 30, 06:00 UTC8h 5m
2026-05-29 DLH760 FRA → DEL May 29, 11:40 UTCMay 29, 18:45 UTC7h 5m
2026-05-28 DLH753 HYD → FRA May 28, 12:20 UTCMay 29, 07:20 UTC19h 0m
2026-05-28 DLH753 HYD → FRA May 28, 11:40 UTCMay 29, 07:20 UTC19h 40m
2026-05-27 DLH471 YYZ → FRA May 27, 23:05 UTCMay 28, 06:10 UTC7h 5m
2026-05-27 DLH470 FRA → YYZ May 27, 13:00 UTCMay 27, 20:40 UTC7h 40m
2026-05-26 DLH761 DEL → FRA May 26, 22:29 UTCMay 27, 06:40 UTC8h 10m
2026-05-26 DLH760 FRA → DEL May 26, 12:45 UTCMay 26, 19:40 UTC6h 55m
2026-05-25 DLH501 GIG → MUC May 25, 19:50 UTCMay 26, 06:14 UTC10h 25m
2026-05-24 DLH500 MUC → GIG May 24, 20:45 UTCMay 25, 07:55 UTC11h 10m
2026-05-23 DLH6EE FRA → LHR May 23, 16:45 UTCMay 23, 17:25 UTC40m
2026-05-23 DLH4MW BER → FRA May 23, 14:55 UTCMay 23, 15:30 UTC35m
2026-05-23 DLH107 MUC → FRA May 23, 12:30 UTCMay 23, 13:05 UTC35m
2026-05-23 DLH7JF FRA → LHR May 23, 10:40 UTCMay 23, 11:10 UTC30m
2026-05-22 DLH471 YYZ → FRA May 22, 22:35 UTCMay 23, 05:20 UTC6h 44m
2026-05-22 DLH470 FRA → YYZ May 22, 12:35 UTCMay 22, 20:05 UTC7h 30m
2026-05-21 DLH471 YYZ → FRA May 21, 23:15 UTCMay 22, 05:40 UTC6h 25m
2026-05-21 DLH470 FRA → YYZ May 21, 12:40 UTCMay 21, 20:20 UTC7h 40m
2026-05-20 DLH471 YYZ → FRA May 20, 23:50 UTCMay 21, 06:30 UTC6h 40m

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 D-ABQA page for operator, model, and routing details .

Mode-S 3C4A21 frequently asked

What is Mode-S code 3C4A21?
3C4A21 is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-ABQA.
Where is Mode-S 3C4A21 registered?
Mode-S code 3C4A21 is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C4A21 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C4A21, octal 17045041, decimal 3,951,137.
What flights does 3C4A21 operate?
Mode-S 3C4A21 has broadcast 18 distinct callsigns, including DLH471, DLH470, DLH753, DLH500, DLH761.