Apparatus

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sensors Mode-S transponder

4D209D

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-COB · CESSNA 525 Citation M2

Hex
4D209D
Octal
23220235
Decimal
5,054,621
Country
MT
Tail
9H-COB
Type
C25M
No current signal · last broadcast 1d ago
Flights observed
38
Distinct callsigns
2
Country
MT
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4D209D.

Country allocation

The ICAO 24-bit address 4D209D 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 2 distinct

Callsign Airline Flights Last seen
AJD17OB - 34 2026-07-13
9HCOB - 4 2026-06-25

Recent flights last 38

DateFlightRouteTakeoffLandingDuration
2026-07-13 AJD17OB - Jul 13, 08:55 UTCJul 13, 10:10 UTC1h 15m
2026-07-13 AJD17OB - Jul 13, 06:05 UTCJul 13, 07:25 UTC1h 20m
2026-07-10 AJD17OB - Jul 10, 16:05 UTCJul 10, 17:25 UTC1h 20m
2026-07-10 AJD17OB - Jul 10, 09:00 UTCJul 10, 10:10 UTC1h 10m
2026-07-09 AJD17OB - Jul 9, 18:05 UTCJul 9, 18:45 UTC40m
2026-07-09 AJD17OB - Jul 9, 11:40 UTCJul 9, 12:20 UTC40m
2026-07-08 AJD17OB - Jul 8, 18:00 UTCJul 8, 18:45 UTC45m
2026-07-08 AJD17OB - Jul 8, 16:10 UTCJul 8, 17:00 UTC50m
2026-07-07 AJD17OB - Jul 7, 17:10 UTCJul 7, 18:00 UTC50m
2026-07-07 AJD17OB LBG → AMS Jul 7, 11:15 UTCJul 7, 12:15 UTC1h 0m
2026-07-06 AJD17OB RTM → LBG Jul 6, 16:15 UTCJul 6, 17:00 UTC45m
2026-07-06 AJD17OB - Jul 6, 08:05 UTCJul 6, 08:55 UTC50m
2026-07-05 AJD17OB - Jul 5, 07:30 UTCJul 5, 09:05 UTC1h 35m
2026-07-04 AJD17OB - Jul 4, 13:35 UTCJul 4, 14:40 UTC1h 5m
2026-07-03 AJD17OB NCE → LBG Jul 3, 12:45 UTCJul 3, 14:05 UTC1h 20m
2026-07-03 AJD17OB - Jul 3, 10:10 UTCJul 3, 11:30 UTC1h 20m
2026-07-02 AJD17OB - Jul 2, 17:30 UTCJul 2, 18:30 UTC1h 0m
2026-07-02 AJD17OB - Jul 2, 15:35 UTCJul 2, 16:25 UTC50m
2026-07-01 AJD17OB LUX → LBG Jul 1, 14:10 UTCJul 1, 14:50 UTC40m
2026-07-01 AJD17OB - Jul 1, 12:45 UTCJul 1, 13:30 UTC45m
2026-07-01 AJD17OB - Jul 1, 10:35 UTCJul 1, 11:30 UTC55m
2026-07-01 AJD17OB - Jul 1, 08:25 UTCJul 1, 09:15 UTC50m
2026-06-28 AJD17OB LTN → LBG Jun 28, 21:40 UTCJun 28, 22:39 UTC1h 0m
2026-06-28 AJD17OB - Jun 28, 19:55 UTCJun 28, 20:45 UTC50m
2026-06-28 AJD17OB - Jun 28, 17:10 UTCJun 28, 18:55 UTC1h 45m
2026-06-28 AJD17OB LBG → CEQ Jun 28, 12:15 UTCJun 28, 13:45 UTC1h 30m
2026-06-27 AJD17OB - Jun 27, 19:39 UTCJun 27, 21:59 UTC2h 20m
2026-06-27 AJD17OB - Jun 27, 16:04 UTCJun 27, 17:29 UTC1h 25m
2026-06-26 AJD17OB - Jun 26, 14:50 UTCJun 26, 15:39 UTC50m
2026-06-25 9HCOB - Jun 25, 07:15 UTCJun 25, 08:09 UTC55m
2026-06-11 9HCOB DOL → LBG Jun 11, 15:20 UTCJun 11, 16:10 UTC50m
2026-06-11 9HCOB - Jun 11, 13:15 UTCJun 11, 13:50 UTC35m
2026-05-03 9HCOB - May 3, 15:25 UTCMay 3, 17:00 UTC1h 35m
2026-05-01 AJD17OB - May 1, 07:05 UTCMay 1, 08:30 UTC1h 25m
2026-04-29 AJD17OB - Apr 29, 09:55 UTCApr 29, 10:50 UTC55m
2026-04-29 AJD17OB - Apr 29, 07:50 UTCApr 29, 08:50 UTC1h 0m
2026-04-13 AJD17OB - Apr 13, 17:00 UTCApr 13, 18:01 UTC1h 1m
2026-04-12 AJD17OB - Apr 12, 17:15 UTCApr 12, 17:30 UTC15m

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 9H-COB page for operator, model, and routing details .

Mode-S 4D209D frequently asked

What is Mode-S code 4D209D?
4D209D is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-COB.
Where is Mode-S 4D209D registered?
Mode-S code 4D209D is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D209D 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 4D209D, octal 23220235, decimal 5,054,621.
What flights does 4D209D operate?
Mode-S 4D209D has broadcast 2 distinct callsigns, including AJD17OB, 9HCOB.