Apparatus

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sensors Mode-S transponder

020139

ICAO 24-bit transponder address · allocated to Morocco

Currently assigned to CN-MAX · BOEING 737 MAX 8

Hex
020139
Octal
00400471
Decimal
131,385
Country
MA
Tail
CN-MAX
Type
B38M
No current signal · last broadcast 1d ago
Flights observed
6
Distinct callsigns
3
Country
MA
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 020139.

Country allocation

The ICAO 24-bit address 020139 falls within the block assigned to Morocco (MA) by ICAO Annex 10, Volume III. Every aircraft registered in Morocco 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 3 distinct

Callsign Airline Flights Last seen
RAM800F Royal Air Maroc 3 2026-04-13
RAM801F - 2 2026-04-13
RAM931G Royal Air Maroc 1 2026-04-12

Recent flights last 6

DateFlightRouteTakeoffLandingDuration
2026-04-13 RAM801F - Apr 13, 19:50 UTCApr 13, 20:25 UTC35m
2026-04-13 RAM801F - Apr 13, 18:05 UTCApr 13, 20:10 UTC2h 5m
2026-04-13 RAM800F CMN → LHR Apr 13, 16:15 UTCApr 13, 16:35 UTC20m
2026-04-13 RAM800F CMN → LHR Apr 13, 15:50 UTCApr 13, 16:35 UTC45m
2026-04-13 RAM800F CMN → LHR Apr 13, 13:30 UTCApr 13, 16:15 UTC2h 45m
2026-04-12 RAM931G GVA → CMN Apr 12, 17:15 UTCApr 12, 18:40 UTC1h 25m

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 CN-MAX page for operator, model, and routing details .

Mode-S 020139 frequently asked

What is Mode-S code 020139?
020139 is an ICAO 24-bit transponder address. Allocated to Morocco. Assigned to CN-MAX.
Where is Mode-S 020139 registered?
Mode-S code 020139 is allocated to Morocco (MA). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 020139 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 020139, octal 00400471, decimal 131,385.
What flights does 020139 operate?
Mode-S 020139 has broadcast 3 distinct callsigns, including RAM800F, RAM801F, RAM931G.