Apparatus

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sensors Mode-S transponder

3C4A8B

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-ABTK · BOEING 747-400

Hex
3C4A8B
Octal
17045213
Decimal
3,951,243
Country
DE
Tail
D-ABTK
Type
B744
No current signal · last broadcast 1h ago
Flights observed
78
Distinct callsigns
12
Country
DE
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 3C4A8B.

Country allocation

The ICAO 24-bit address 3C4A8B 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 12 distinct

Callsign Airline Flights Last seen
DLH7K Lufthansa 10 2026-05-30
DLH423 Lufthansa 10 2026-05-15
DLH455 Lufthansa 9 2026-05-27
DLH441 Lufthansa 9 2026-05-22
DLH3CF Lufthansa 9 2026-05-22
DLH493 Lufthansa 7 2026-05-30
DLH492 Lufthansa 7 2026-05-29
DLH454 Lufthansa 6 2026-05-27
DLH781 Lufthansa 4 2026-05-25
DLH780 Lufthansa 4 2026-05-24
DLH755 Lufthansa 2 2026-05-07
DLH754 Lufthansa 1 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 DLH7K FRA → BOS May 30, 13:50 UTCMay 30, 14:45 UTC55m
2026-05-30 DLH493 YVR → FRA May 30, 00:25 UTCMay 30, 09:15 UTC8h 50m
2026-05-29 DLH492 FRA → YVR May 29, 12:40 UTCMay 29, 22:00 UTC9h 20m
2026-05-28 DLH493 YVR → FRA May 28, 23:55 UTCMay 29, 08:50 UTC8h 55m
2026-05-28 DLH492 FRA → YVR May 28, 12:05 UTCMay 28, 21:30 UTC9h 25m
2026-05-27 DLH455 SFO → FRA May 27, 22:25 UTCMay 28, 08:35 UTC10h 10m
2026-05-27 DLH454 FRA → SFO May 27, 09:00 UTCMay 27, 19:50 UTC10h 50m
2026-05-25 DLH781 SIN → FRA May 25, 16:10 UTCMay 26, 04:39 UTC12h 30m
2026-05-24 DLH780 FRA → SIN May 24, 20:15 UTCMay 25, 08:00 UTC11h 45m
2026-05-24 DLH493 YVR → FRA May 24, 01:35 UTCMay 24, 10:20 UTC8h 45m
2026-05-23 DLH492 FRA → YVR May 23, 13:05 UTCMay 23, 22:50 UTC9h 45m
2026-05-22 DLH441 IAH → FRA May 22, 21:25 UTCMay 23, 06:00 UTC8h 34m
2026-05-22 DLH3CF ARN → FRA May 22, 08:35 UTCMay 22, 18:40 UTC10h 5m
2026-05-21 DLH781 SIN → FRA May 21, 16:35 UTCMay 22, 04:45 UTC12h 10m
2026-05-20 DLH780 FRA → SIN May 20, 20:20 UTCMay 21, 08:05 UTC11h 45m
2026-05-19 DLH493 YVR → FRA May 19, 23:50 UTCMay 20, 09:00 UTC9h 11m
2026-05-19 DLH492 FRA → YVR May 19, 12:30 UTCMay 19, 21:40 UTC9h 10m
2026-05-18 DLH441 IAH → FRA May 18, 23:05 UTCMay 19, 08:00 UTC8h 55m
2026-05-18 DLH3CF ARN → FRA May 18, 10:25 UTCMay 18, 20:25 UTC9h 59m
2026-05-17 DLH441 IAH → FRA May 17, 21:40 UTCMay 18, 06:35 UTC8h 55m
2026-05-17 DLH3CF ARN → FRA May 17, 08:35 UTCMay 17, 18:45 UTC10h 10m
2026-05-15 DLH423 BOS → FRA May 15, 22:15 UTCMay 16, 04:30 UTC6h 15m
2026-05-15 DLH7K FRA → BOS May 15, 12:00 UTCMay 15, 19:35 UTC7h 34m
2026-05-14 DLH455 SFO → FRA May 14, 22:50 UTCMay 15, 08:40 UTC9h 50m
2026-05-14 DLH454 FRA → SFO May 14, 09:25 UTCMay 14, 20:15 UTC10h 50m
2026-05-13 DLH781 SIN → FRA May 13, 16:05 UTCMay 14, 04:30 UTC12h 25m
2026-05-12 DLH780 FRA → SIN May 12, 20:20 UTCMay 13, 07:45 UTC11h 25m
2026-05-12 DLH493 YVR → FRA May 12, 02:45 UTCMay 12, 09:00 UTC6h 15m
2026-05-11 DLH492 FRA → YVR May 11, 12:00 UTCMay 11, 21:30 UTC9h 30m
2026-05-10 DLH423 BOS → FRA May 10, 22:15 UTCMay 11, 04:45 UTC6h 30m
2026-05-10 DLH7K FRA → BOS May 10, 11:50 UTCMay 10, 19:09 UTC7h 20m
2026-05-09 DLH455 SFO → FRA May 9, 22:25 UTCMay 10, 08:40 UTC10h 15m
2026-05-09 DLH454 FRA → SFO May 9, 08:55 UTCMay 9, 19:55 UTC11h 0m
2026-05-08 DLH423 BOS → FRA May 8, 23:30 UTCMay 9, 05:00 UTC5h 30m
2026-05-08 DLH423 BOS → FRA May 8, 22:35 UTCMay 8, 23:25 UTC50m
2026-05-08 DLH7K FRA → BOS May 8, 12:14 UTCMay 8, 19:50 UTC7h 35m
2026-05-07 DLH493 YVR → FRA May 7, 23:59 UTCMay 8, 09:09 UTC9h 10m
2026-05-07 DLH492 FRA → YVR May 7, 12:30 UTCMay 7, 21:35 UTC9h 5m
2026-05-07 DLH755 BLR → FRA May 7, 00:45 UTCMay 7, 08:05 UTC7h 20m
2026-05-06 DLH755 BLR → FRA May 6, 23:00 UTCMay 6, 23:15 UTC15m
2026-05-06 DLH754 FRA → BLR May 6, 11:35 UTCMay 6, 20:05 UTC8h 29m
2026-05-05 DLH441 IAH → FRA May 5, 21:30 UTCMay 6, 06:30 UTC9h 0m
2026-05-05 DLH3CF ARN → FRA May 5, 08:30 UTCMay 5, 18:35 UTC10h 5m
2026-05-03 DLH455 SFO → FRA May 3, 22:45 UTCMay 4, 09:05 UTC10h 20m
2026-05-03 DLH454 FRA → SFO May 3, 09:00 UTCMay 3, 20:00 UTC11h 0m
2026-05-02 DLH423 BOS → FRA May 2, 22:15 UTCMay 3, 04:55 UTC6h 39m
2026-05-02 DLH7K FRA → BOS May 2, 11:55 UTCMay 2, 19:15 UTC7h 20m
2026-05-01 DLH441 IAH → FRA May 1, 21:25 UTCMay 2, 06:25 UTC9h 1m
2026-05-01 DLH3CF ARN → FRA May 1, 08:30 UTCMay 1, 19:00 UTC10h 30m
2026-04-30 DLH423 BOS → FRA Apr 30, 22:05 UTCMay 1, 04:55 UTC6h 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 D-ABTK page for operator, model, and routing details .

Mode-S 3C4A8B frequently asked

What is Mode-S code 3C4A8B?
3C4A8B is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-ABTK.
Where is Mode-S 3C4A8B registered?
Mode-S code 3C4A8B is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C4A8B broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C4A8B, octal 17045213, decimal 3,951,243.
What flights does 3C4A8B operate?
Mode-S 3C4A8B has broadcast 12 distinct callsigns, including DLH7K, DLH423, DLH455, DLH441, DLH3CF.