Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

3C4D4A

ICAO 24-bit transponder address · allocated to Germany

Currently assigned to D-ACJJ · EMBRAER ERJ-190-100

Hex
3C4D4A
Octal
17046512
Decimal
3,951,946
Country
DE
Tail
D-ACJJ
Type
E190
No current signal · last broadcast 16d ago
Flights observed
183
Distinct callsigns
20
Country
DE
Last broadcast
16d ago

Last known position

Most recent position reported by Mode-S 3C4D4A.

Country allocation

The ICAO 24-bit address 3C4D4A 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
KLM91K KLM Royal Dutch Airlines 12 2026-07-24
KLM39R - 12 2026-07-25
KLM1282 KLM Royal Dutch Airlines 12 2026-07-25
KLM32F KLM Royal Dutch Airlines 11 2026-07-25
KLM56H KLM Royal Dutch Airlines 7 2026-07-24
KLM17V KLM Royal Dutch Airlines 7 2026-07-24
KLM991 KLM Royal Dutch Airlines 6 2026-07-24
KLM66C KLM Royal Dutch Airlines 6 2026-07-24
KLM47T KLM Royal Dutch Airlines 6 2026-07-25
KLM44K KLM Royal Dutch Airlines 6 2026-07-25
KLM1943 KLM Royal Dutch Airlines 6 2026-07-20
KLM1805 KLM Royal Dutch Airlines 6 2026-07-26
KLM88A KLM Royal Dutch Airlines 5 2026-07-26
KLM76K - 5 2026-07-13
KLM68C KLM Royal Dutch Airlines 5 2026-07-26
KLM59F - 5 2026-07-12
KLM57R KLM Royal Dutch Airlines 5 2026-07-26
KLM1944 KLM Royal Dutch Airlines 5 2026-07-20
KLM1801 KLM Royal Dutch Airlines 5 2026-07-26
KLM1182 KLM Royal Dutch Airlines 5 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KLM1805 AMS → DUS Jul 26, 20:10 UTCJul 26, 20:40 UTC30m
2026-07-26 KLM1182 LPI → AMS Jul 26, 16:50 UTCJul 26, 18:05 UTC1h 15m
2026-07-26 KLM57R AMS → SVG Jul 26, 14:45 UTCJul 26, 15:55 UTC1h 10m
2026-07-26 KLM68C DUS → AMS Jul 26, 12:40 UTCJul 26, 13:15 UTC35m
2026-07-26 KLM1801 AMS → MUC Jul 26, 11:25 UTCJul 26, 11:55 UTC30m
2026-07-26 KLM90U ABZ → AMS Jul 26, 08:20 UTCJul 26, 09:20 UTC1h 0m
2026-07-26 KLM911 AMS → ABZ Jul 26, 06:25 UTCJul 26, 07:35 UTC1h 11m
2026-07-26 KLM88A DUS → AMS Jul 26, 04:35 UTCJul 26, 05:05 UTC30m
2026-07-25 KLM1805 AMS → DUS Jul 25, 19:55 UTCJul 25, 20:20 UTC25m
2026-07-25 KLM44K CWL → AMS Jul 25, 17:10 UTCJul 25, 18:05 UTC55m
2026-07-25 KLM47T AMS → CWL Jul 25, 15:05 UTCJul 25, 16:05 UTC1h 0m
2026-07-25 KLM32F AAL → AMS Jul 25, 12:30 UTCJul 25, 13:35 UTC1h 5m
2026-07-25 KLM39R - Jul 25, 10:35 UTCJul 25, 11:30 UTC55m
2026-07-25 KLM982 LCY → AMS Jul 25, 08:50 UTCJul 25, 09:30 UTC40m
2026-07-25 KLM47M AMS → LCY Jul 25, 07:00 UTCJul 25, 07:35 UTC35m
2026-07-25 KLM1282 EDI → AMS Jul 25, 04:35 UTCJul 25, 05:30 UTC55m
2026-07-24 KLM91K AMS → AAL Jul 24, 19:50 UTCJul 24, 20:45 UTC55m
2026-07-24 KLM66C TRF → AMS Jul 24, 17:25 UTCJul 24, 18:05 UTC40m
2026-07-24 KLM991 AMS → LCY Jul 24, 15:25 UTCJul 24, 16:05 UTC40m
2026-07-24 KLM32F AAL → AMS Jul 24, 12:35 UTCJul 24, 13:35 UTC1h 0m
2026-07-24 KLM39R AMS → AAL Jul 24, 10:35 UTCJul 24, 11:40 UTC1h 5m
2026-07-24 KLM56H LUX → AMS Jul 24, 08:55 UTCJul 24, 09:40 UTC45m
2026-07-24 KLM17V AMS → LUX Jul 24, 07:10 UTCJul 24, 08:05 UTC55m
2026-07-24 KLM1282 EDI → AMS Jul 24, 04:30 UTCJul 24, 05:30 UTC1h 0m
2026-07-23 KLM91K AMS → AAL Jul 23, 19:45 UTCJul 23, 20:45 UTC1h 0m
2026-07-23 KLM1182 LPI → AMS Jul 23, 16:30 UTCJul 23, 17:35 UTC1h 5m
2026-07-23 KLM57R AMS → SVG Jul 23, 14:35 UTCJul 23, 15:45 UTC1h 10m
2026-07-23 KLM68C DUS → AMS Jul 23, 12:50 UTCJul 23, 13:25 UTC35m
2026-07-23 KLM1801 AMS → MUC Jul 23, 11:25 UTCJul 23, 11:50 UTC25m
2026-07-23 KLM90U ABZ → AMS Jul 23, 08:15 UTCJul 23, 09:20 UTC1h 5m
2026-07-23 KLM911 AMS → ABZ Jul 23, 06:20 UTCJul 23, 07:25 UTC1h 5m
2026-07-23 KLM88A DUS → AMS Jul 23, 04:45 UTCJul 23, 05:05 UTC20m
2026-07-22 KLM1805 AMS → DUS Jul 22, 20:10 UTCJul 22, 20:40 UTC30m
2026-07-22 KLM1182 LPI → AMS Jul 22, 16:35 UTCJul 22, 17:50 UTC1h 15m
2026-07-22 KLM57R AMS → SVG Jul 22, 14:35 UTCJul 22, 15:50 UTC1h 15m
2026-07-22 KLM68C DUS → AMS Jul 22, 13:00 UTCJul 22, 13:35 UTC35m
2026-07-22 KLM1801 AMS → MUC Jul 22, 11:30 UTCJul 22, 11:55 UTC25m
2026-07-22 KLM88A DUS → AMS Jul 22, 04:35 UTCJul 22, 05:05 UTC30m
2026-07-21 KLM1805 AMS → DUS Jul 21, 20:05 UTCJul 21, 20:35 UTC30m
2026-07-21 KLM1182 LPI → AMS Jul 21, 16:45 UTCJul 21, 17:55 UTC1h 10m
2026-07-21 KLM57R AMS → SVG Jul 21, 14:40 UTCJul 21, 15:45 UTC1h 5m
2026-07-21 KLM68C DUS → AMS Jul 21, 12:55 UTCJul 21, 13:35 UTC40m
2026-07-21 KLM1801 AMS → MUC Jul 21, 11:35 UTCJul 21, 12:10 UTC35m
2026-07-21 KLM90U ABZ → AMS Jul 21, 08:30 UTCJul 21, 09:35 UTC1h 5m
2026-07-21 KLM911 AMS → ABZ Jul 21, 06:30 UTCJul 21, 07:40 UTC1h 10m
2026-07-21 KLM88A DUS → AMS Jul 21, 04:35 UTCJul 21, 05:10 UTC35m
2026-07-20 KLM1805 AMS → DUS Jul 20, 19:50 UTCJul 20, 20:15 UTC25m
2026-07-20 KLM66C TRF → AMS Jul 20, 17:10 UTCJul 20, 17:50 UTC40m
2026-07-20 KLM991 AMS → LCY Jul 20, 15:35 UTCJul 20, 16:20 UTC45m
2026-07-20 KLM32F - Jul 20, 12:25 UTCJul 20, 13:30 UTC1h 5m

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-ACJJ page for operator, model, and routing details .

Mode-S 3C4D4A frequently asked

What is Mode-S code 3C4D4A?
3C4D4A is an ICAO 24-bit transponder address. Allocated to Germany. Assigned to D-ACJJ.
Where is Mode-S 3C4D4A registered?
Mode-S code 3C4D4A is allocated to Germany (DE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 3C4D4A broadcasting right now?
No active broadcast right now. Last signal was 16d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 3C4D4A, octal 17046512, decimal 3,951,946.
What flights does 3C4D4A operate?
Mode-S 3C4D4A has broadcast 20 distinct callsigns, including KLM91K, KLM39R, KLM1282, KLM32F, KLM56H.