Apparatus

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sensors Mode-S transponder

4D20C3

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to AS1428 · AGUSTA AW-139

Hex
4D20C3
Octal
23220303
Decimal
5,054,659
Country
MT
Tail
AS1428
Type
A139
No current signal · last broadcast 1d ago
Flights observed
30
Distinct callsigns
3
Country
MT
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4D20C3.

Country allocation

The ICAO 24-bit address 4D20C3 falls within the block assigned to Malta (MT) by ICAO Annex 10, Volume III. Every aircraft registered in Malta 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
AS1428 Alaska Airlines 24 2026-06-19
AS28 Alaska Airlines 4 2026-05-06
RESCUE28 - 2 2026-06-11

Recent flights last 30

DateFlightRouteTakeoffLandingDuration
2026-06-19 AS1428 SFO → SJD Jun 19, 16:14 UTCJun 19, 16:55 UTC40m
2026-06-19 AS1428 SFO → SJD Jun 19, 15:44 UTCJun 19, 16:09 UTC25m
2026-06-18 AS1428 SFO → SJD Jun 18, 07:50 UTCJun 18, 09:05 UTC1h 15m
2026-06-16 AS1428 SFO → SJD Jun 16, 15:45 UTCJun 16, 16:50 UTC1h 5m
2026-06-11 AS1428 SFO → SJD Jun 11, 07:40 UTCJun 11, 07:50 UTC10m
2026-06-11 RESCUE28 - Jun 11, 04:30 UTCJun 11, 06:25 UTC1h 55m
2026-06-10 AS1428 SFO → SJD Jun 10, 10:55 UTCJun 10, 12:10 UTC1h 15m
2026-06-10 AS1428 SFO → SJD Jun 10, 08:15 UTCJun 10, 09:15 UTC1h 0m
2026-06-07 AS1428 SFO → SJD Jun 7, 20:45 UTCJun 7, 21:35 UTC50m
2026-06-07 AS1428 SFO → SJD Jun 7, 12:10 UTCJun 7, 12:20 UTC10m
2026-06-07 AS1428 SFO → SJD Jun 7, 05:50 UTCJun 7, 06:00 UTC10m
2026-05-29 AS1428 SFO → SJD May 29, 08:20 UTCMay 29, 10:10 UTC1h 50m
2026-05-26 AS1428 SFO → SJD May 26, 10:25 UTCMay 26, 10:39 UTC15m
2026-05-26 AS1428 SFO → SJD May 26, 09:55 UTCMay 26, 10:20 UTC25m
2026-05-26 AS1428 SFO → SJD May 26, 09:29 UTCMay 26, 09:49 UTC20m
2026-05-25 AS1428 SFO → SJD May 25, 09:35 UTCMay 25, 10:35 UTC1h 0m
2026-05-18 AS1428 SFO → SJD May 18, 09:10 UTCMay 18, 09:55 UTC45m
2026-05-18 AS1428 SFO → SJD May 18, 08:45 UTCMay 18, 09:05 UTC20m
2026-05-18 AS1428 SFO → SJD May 18, 08:05 UTCMay 18, 08:35 UTC30m
2026-05-14 AS1428 SFO → SJD May 14, 09:20 UTCMay 14, 10:00 UTC40m
2026-05-14 AS1428 SFO → SJD May 14, 09:00 UTCMay 14, 09:15 UTC15m
2026-05-14 AS1428 SFO → SJD May 14, 08:25 UTCMay 14, 08:50 UTC25m
2026-05-11 AS1428 SFO → SJD May 11, 15:30 UTCMay 11, 16:55 UTC1h 25m
2026-05-08 AS1428 SFO → SJD May 8, 08:40 UTCMay 8, 09:25 UTC45m
2026-05-08 AS1428 SFO → SJD May 8, 07:50 UTCMay 8, 08:34 UTC45m
2026-05-06 AS28 PDX → EWR May 6, 11:35 UTCMay 6, 12:40 UTC1h 5m
2026-04-30 AS28 PDX → EWR Apr 30, 09:50 UTCApr 30, 11:35 UTC1h 45m
2026-04-20 AS28 PDX → EWR Apr 20, 09:20 UTCApr 20, 10:10 UTC50m
2026-04-20 AS28 PDX → EWR Apr 20, 09:05 UTCApr 20, 09:15 UTC10m
2026-04-16 RESCUE28 - Apr 16, 15:40 UTCApr 16, 16:05 UTC25m

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 AS1428 page for operator, model, and routing details .

Mode-S 4D20C3 frequently asked

What is Mode-S code 4D20C3?
4D20C3 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to AS1428.
Where is Mode-S 4D20C3 registered?
Mode-S code 4D20C3 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D20C3 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 4D20C3, octal 23220303, decimal 5,054,659.
What flights does 4D20C3 operate?
Mode-S 4D20C3 has broadcast 3 distinct callsigns, including AS1428, AS28, RESCUE28.