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sensors Mode-S transponder

4D4039

ICAO 24-bit transponder address · allocated to Monaco

Currently assigned to 3A-MPJ · AIRBUS HELICOPTERS EC-130

Hex
4D4039
Octal
23240071
Decimal
5,062,713
Country
MC
Tail
3A-MPJ
Type
EC30
No current signal · last broadcast Jul 26, 16:55 UTC
Flights observed
340
Distinct callsigns
1
Country
MC
Last broadcast
Jul 26, 16:55 UTC

Last known position

Most recent position reported by Mode-S 4D4039.

Country allocation

The ICAO 24-bit address 4D4039 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
3AMPJ - 340 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 3AMPJ MCM → CEQ Jul 26, 15:45 UTCJul 26, 16:55 UTC1h 10m
2026-07-25 3AMPJ - Jul 25, 17:30 UTCJul 25, 18:00 UTC30m
2026-07-25 3AMPJ - Jul 25, 11:50 UTCJul 25, 15:10 UTC3h 20m
2026-07-25 3AMPJ - Jul 25, 10:30 UTCJul 25, 10:50 UTC20m
2026-07-25 3AMPJ MCM → MCM Jul 25, 07:50 UTCJul 25, 09:30 UTC1h 40m
2026-07-24 3AMPJ - Jul 24, 15:30 UTCJul 24, 18:10 UTC2h 40m
2026-07-24 3AMPJ - Jul 24, 08:20 UTCJul 24, 09:00 UTC40m
2026-07-23 3AMPJ CEQ → CEQ Jul 23, 14:15 UTCJul 23, 14:25 UTC10m
2026-07-21 3AMPJ MCM → CEQ Jul 21, 14:00 UTCJul 21, 17:00 UTC3h 0m
2026-07-21 3AMPJ - Jul 21, 10:55 UTCJul 21, 11:20 UTC25m
2026-07-21 3AMPJ - Jul 21, 09:35 UTCJul 21, 10:05 UTC30m
2026-07-20 3AMPJ MCM → MCM Jul 20, 17:00 UTCJul 20, 18:30 UTC1h 30m
2026-07-20 3AMPJ - Jul 20, 14:30 UTCJul 20, 15:40 UTC1h 10m
2026-07-20 3AMPJ - Jul 20, 12:20 UTCJul 20, 13:20 UTC1h 0m
2026-07-20 3AMPJ - Jul 20, 09:55 UTCJul 20, 11:05 UTC1h 10m
2026-07-20 3AMPJ - Jul 20, 07:25 UTCJul 20, 08:00 UTC35m
2026-07-19 3AMPJ MCM → MCM Jul 19, 17:05 UTCJul 19, 18:00 UTC55m
2026-07-19 3AMPJ - Jul 19, 15:35 UTCJul 19, 16:15 UTC40m
2026-07-19 3AMPJ - Jul 19, 11:45 UTCJul 19, 12:10 UTC25m
2026-07-18 3AMPJ - Jul 18, 15:30 UTCJul 18, 17:45 UTC2h 15m
2026-07-18 3AMPJ - Jul 18, 13:35 UTCJul 18, 14:30 UTC55m
2026-07-18 3AMPJ - Jul 18, 10:35 UTCJul 18, 11:50 UTC1h 15m
2026-07-18 3AMPJ NCE → LTT Jul 18, 06:55 UTCJul 18, 08:05 UTC1h 10m
2026-07-17 3AMPJ - Jul 17, 16:24 UTCJul 17, 16:40 UTC15m
2026-07-17 3AMPJ NCE → MCM Jul 17, 14:39 UTCJul 17, 14:50 UTC10m
2026-07-17 3AMPJ - Jul 17, 12:55 UTCJul 17, 13:40 UTC45m
2026-07-17 3AMPJ - Jul 17, 10:10 UTCJul 17, 11:55 UTC1h 45m
2026-07-17 3AMPJ - Jul 17, 06:50 UTCJul 17, 07:14 UTC25m
2026-07-16 3AMPJ - Jul 16, 15:49 UTCJul 16, 17:25 UTC1h 35m
2026-07-16 3AMPJ CEQ → MCM Jul 16, 14:35 UTCJul 16, 15:00 UTC25m
2026-07-16 3AMPJ CEQ → CEQ Jul 16, 09:10 UTCJul 16, 10:55 UTC1h 45m
2026-07-15 3AMPJ - Jul 15, 18:00 UTCJul 15, 18:20 UTC20m
2026-07-15 3AMPJ - Jul 15, 13:30 UTCJul 15, 15:15 UTC1h 45m
2026-07-15 3AMPJ MCM → MCM Jul 15, 11:05 UTCJul 15, 11:25 UTC20m
2026-07-15 3AMPJ NCE → MCM Jul 15, 08:15 UTCJul 15, 08:50 UTC35m
2026-07-15 3AMPJ - Jul 15, 05:15 UTCJul 15, 05:35 UTC20m
2026-07-14 3AMPJ - Jul 14, 16:20 UTCJul 14, 17:20 UTC1h 0m
2026-07-14 3AMPJ LTT → CEQ Jul 14, 14:05 UTCJul 14, 14:25 UTC20m
2026-07-14 3AMPJ - Jul 14, 11:55 UTCJul 14, 12:30 UTC35m
2026-07-14 3AMPJ - Jul 14, 10:30 UTCJul 14, 10:55 UTC25m
2026-07-14 3AMPJ - Jul 14, 07:55 UTCJul 14, 09:40 UTC1h 45m
2026-07-14 3AMPJ - Jul 14, 05:50 UTCJul 14, 07:00 UTC1h 10m
2026-07-13 3AMPJ MCM → CEQ Jul 13, 17:00 UTCJul 13, 17:45 UTC45m
2026-07-13 3AMPJ MCM → MCM Jul 13, 14:50 UTCJul 13, 15:50 UTC1h 0m
2026-07-13 3AMPJ - Jul 13, 11:45 UTCJul 13, 13:50 UTC2h 5m
2026-07-13 3AMPJ - Jul 13, 10:25 UTCJul 13, 11:00 UTC35m
2026-07-13 3AMPJ MCM → LTT Jul 13, 08:30 UTCJul 13, 09:30 UTC1h 0m
2026-07-12 3AMPJ - Jul 12, 16:10 UTCJul 12, 16:35 UTC25m
2026-07-12 3AMPJ - Jul 12, 12:25 UTCJul 12, 13:30 UTC1h 5m
2026-07-12 3AMPJ - Jul 12, 06:30 UTCJul 12, 10:50 UTC4h 20m

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

Mode-S 4D4039 frequently asked

What is Mode-S code 4D4039?
4D4039 is an ICAO 24-bit transponder address. Allocated to Monaco. Assigned to 3A-MPJ.
Where is Mode-S 4D4039 registered?
Mode-S code 4D4039 is allocated to Monaco (MC). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D4039 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D4039, octal 23240071, decimal 5,062,713.
What flights does 4D4039 operate?
Mode-S 4D4039 has broadcast 1 distinct callsign, including 3AMPJ.