Apparatus

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sensors Mode-S transponder

4D4027

ICAO 24-bit transponder address · allocated to Monaco

Currently assigned to 3A-MAC · AEROSPATIALE AS-350 Ecureuil

Hex
4D4027
Octal
23240047
Decimal
5,062,695
Country
MC
Tail
3A-MAC
Type
AS50
No current signal · last broadcast 23d ago
Flights observed
405
Distinct callsigns
1
Country
MC
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S 4D4027.

Country allocation

The ICAO 24-bit address 4D4027 falls within the block assigned to Monaco (MC) by ICAO Annex 10, Volume III. Every aircraft registered in Monaco 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 1 distinct

Callsign Airline Flights Last seen
3AMAC - 405 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 3AMAC - Jul 26, 16:45 UTCJul 26, 17:20 UTC35m
2026-07-26 3AMAC - Jul 26, 15:00 UTCJul 26, 15:50 UTC50m
2026-07-26 3AMAC - Jul 26, 14:20 UTCJul 26, 14:25 UTC5m
2026-07-26 3AMAC MCM → NCE Jul 26, 14:05 UTCJul 26, 14:15 UTC10m
2026-07-26 3AMAC - Jul 26, 09:20 UTCJul 26, 09:40 UTC20m
2026-07-26 3AMAC - Jul 26, 08:15 UTCJul 26, 08:50 UTC35m
2026-07-26 3AMAC - Jul 26, 05:55 UTCJul 26, 06:45 UTC51m
2026-07-25 3AMAC - Jul 25, 17:40 UTCJul 25, 18:10 UTC30m
2026-07-25 3AMAC - Jul 25, 10:30 UTCJul 25, 10:40 UTC10m
2026-07-25 3AMAC NCE → MCM Jul 25, 09:10 UTCJul 25, 09:20 UTC10m
2026-07-25 3AMAC - Jul 25, 08:55 UTCJul 25, 09:00 UTC5m
2026-07-25 3AMAC - Jul 25, 08:35 UTCJul 25, 08:50 UTC15m
2026-07-25 3AMAC - Jul 25, 07:45 UTCJul 25, 08:15 UTC30m
2026-07-24 3AMAC - Jul 24, 16:35 UTCJul 24, 17:30 UTC55m
2026-07-24 3AMAC - Jul 24, 14:25 UTCJul 24, 16:00 UTC1h 35m
2026-07-24 3AMAC - Jul 24, 13:35 UTCJul 24, 13:55 UTC20m
2026-07-24 3AMAC - Jul 24, 09:25 UTCJul 24, 09:40 UTC15m
2026-07-24 3AMAC - Jul 24, 09:10 UTCJul 24, 09:20 UTC10m
2026-07-24 3AMAC - Jul 24, 08:45 UTCJul 24, 09:05 UTC20m
2026-07-24 3AMAC - Jul 24, 08:00 UTCJul 24, 08:05 UTC5m
2026-07-24 3AMAC - Jul 24, 06:45 UTCJul 24, 07:35 UTC50m
2026-07-23 3AMAC - Jul 23, 19:30 UTCJul 23, 20:10 UTC40m
2026-07-23 3AMAC - Jul 23, 17:00 UTCJul 23, 18:45 UTC1h 45m
2026-07-23 3AMAC - Jul 23, 15:25 UTCJul 23, 15:45 UTC20m
2026-07-23 3AMAC - Jul 23, 07:45 UTCJul 23, 09:35 UTC1h 50m
2026-07-23 3AMAC - Jul 23, 06:25 UTCJul 23, 06:35 UTC10m
2026-07-22 3AMAC - Jul 22, 18:30 UTCJul 22, 18:45 UTC15m
2026-07-22 3AMAC - Jul 22, 17:05 UTCJul 22, 17:20 UTC15m
2026-07-22 3AMAC - Jul 22, 12:45 UTCJul 22, 15:50 UTC3h 5m
2026-07-22 3AMAC - Jul 22, 12:25 UTCJul 22, 12:40 UTC15m
2026-07-21 3AMAC - Jul 21, 16:05 UTCJul 21, 16:25 UTC20m
2026-07-21 3AMAC - Jul 21, 15:00 UTCJul 21, 16:00 UTC1h 0m
2026-07-21 3AMAC - Jul 21, 14:10 UTCJul 21, 14:55 UTC45m
2026-07-21 3AMAC - Jul 21, 13:50 UTCJul 21, 14:05 UTC15m
2026-07-21 3AMAC - Jul 21, 06:40 UTCJul 21, 07:00 UTC20m
2026-07-18 3AMAC - Jul 18, 17:10 UTCJul 18, 18:00 UTC50m
2026-07-18 3AMAC - Jul 18, 15:25 UTCJul 18, 16:20 UTC55m
2026-07-18 3AMAC - Jul 18, 13:00 UTCJul 18, 14:20 UTC1h 20m
2026-07-18 3AMAC - Jul 18, 12:35 UTCJul 18, 12:55 UTC20m
2026-07-18 3AMAC NCE → LTT Jul 18, 11:40 UTCJul 18, 12:05 UTC25m
2026-07-18 3AMAC - Jul 18, 11:10 UTCJul 18, 11:25 UTC15m
2026-07-18 3AMAC - Jul 18, 09:50 UTCJul 18, 10:35 UTC45m
2026-07-18 3AMAC MCM → NCE Jul 18, 09:35 UTCJul 18, 09:45 UTC10m
2026-07-17 3AMAC - Jul 17, 17:20 UTCJul 17, 17:40 UTC20m
2026-07-17 3AMAC - Jul 17, 12:10 UTCJul 17, 14:00 UTC1h 50m
2026-07-17 3AMAC NCE → MCM Jul 17, 11:45 UTCJul 17, 12:04 UTC20m
2026-07-17 3AMAC - Jul 17, 10:10 UTCJul 17, 10:15 UTC5m
2026-07-17 3AMAC - Jul 17, 09:55 UTCJul 17, 10:05 UTC10m
2026-07-17 3AMAC - Jul 17, 09:04 UTCJul 17, 09:15 UTC10m
2026-07-17 3AMAC CEQ → NCE Jul 17, 08:15 UTCJul 17, 08:59 UTC45m

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 3A-MAC page for operator, model, and routing details .

Mode-S 4D4027 frequently asked

What is Mode-S code 4D4027?
4D4027 is an ICAO 24-bit transponder address. Allocated to Monaco. Assigned to 3A-MAC.
Where is Mode-S 4D4027 registered?
Mode-S code 4D4027 is allocated to Monaco (MC). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D4027 broadcasting right now?
No active broadcast right now. Last signal was 23d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D4027, octal 23240047, decimal 5,062,695.
What flights does 4D4027 operate?
Mode-S 4D4027 has broadcast 1 distinct callsign, including 3AMAC.