Apparatus

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sensors Mode-S transponder

4D2161

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-SEY · AIRBUS A-320

Hex
4D2161
Octal
23220541
Decimal
5,054,817
Country
MT
Tail
9H-SEY
Type
A320
No current signal · last broadcast 2d ago
Flights observed
186
Distinct callsigns
20
Country
MT
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 4D2161.

Country allocation

The ICAO 24-bit address 4D2161 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 20 distinct

Callsign Airline Flights Last seen
AHY035 - 27 2026-07-12
AHY036 - 20 2026-07-12
AHY8003 - 11 2026-07-12
AHY8105 - 10 2026-07-14
AHY071 - 10 2026-07-03
AHY073 Azerbaijan Airlines 9 2026-07-25
AHY063 Azerbaijan Airlines 8 2026-07-21
AHY074 Azerbaijan Airlines 6 2026-07-26
AHY072 - 6 2026-07-03
AHY8226 Azerbaijan Airlines 5 2026-07-25
AHY8106 - 5 2026-07-14
AHY703 Azerbaijan Airlines 5 2026-07-23
AHY110 - 5 2026-07-17
AHY109 - 5 2026-07-17
AHY064 - 5 2026-07-21
AHY061 - 5 2026-07-09
AHY8237 Azerbaijan Airlines 4 2026-07-25
AHY125 - 4 2026-07-18
AHY062 - 4 2026-07-09
AHY8238 Azerbaijan Airlines 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AHY074 CDG → GYD Jul 26, 10:30 UTCJul 26, 14:50 UTC4h 20m
2026-07-25 AHY073 GYD → CDG Jul 25, 22:10 UTCJul 26, 08:45 UTC10h 36m
2026-07-25 AHY8226 TBS → GYD Jul 25, 17:55 UTCJul 25, 20:55 UTC3h 0m
2026-07-25 AHY8225 GYD → TBS Jul 25, 15:55 UTCJul 25, 16:35 UTC40m
2026-07-25 AHY8238 TBS → GYD Jul 25, 04:25 UTCJul 25, 04:55 UTC30m
2026-07-25 AHY8237 GYD → TBS Jul 25, 02:40 UTCJul 25, 03:10 UTC30m
2026-07-24 AHY074 CDG → GYD Jul 24, 10:40 UTCJul 24, 14:50 UTC4h 10m
2026-07-24 AHY073 GYD → CDG Jul 24, 03:50 UTCJul 24, 09:00 UTC5h 10m
2026-07-23 AHY073 GYD → CDG Jul 23, 10:25 UTCJul 24, 09:00 UTC22h 35m
2026-07-23 AHY703 GYD → RMO Jul 23, 06:20 UTCJul 23, 07:45 UTC1h 25m
2026-07-22 AHY703 GYD → RMO Jul 22, 10:20 UTCJul 23, 07:45 UTC21h 25m
2026-07-21 AHY064 - Jul 21, 09:45 UTCJul 21, 12:00 UTC2h 15m
2026-07-21 AHY063 GYD → BER Jul 21, 03:55 UTCJul 21, 08:05 UTC4h 10m
2026-07-20 AHY8238 - Jul 20, 22:20 UTCJul 20, 22:50 UTC30m
2026-07-20 AHY8237 - Jul 20, 20:20 UTCJul 20, 20:50 UTC30m
2026-07-20 AHY8226 TBS → GYD Jul 20, 17:30 UTCJul 20, 17:55 UTC25m
2026-07-20 AHY703 GYD → RMO Jul 20, 06:25 UTCJul 20, 16:10 UTC9h 45m
2026-07-19 AHY074 - Jul 19, 10:35 UTCJul 19, 14:45 UTC4h 10m
2026-07-19 AHY073 - Jul 19, 03:35 UTCJul 19, 08:45 UTC5h 10m
2026-07-18 AHY126 AYT → GYD Jul 18, 15:10 UTCJul 18, 17:00 UTC1h 50m
2026-07-18 AHY125 - Jul 18, 11:20 UTCJul 18, 13:45 UTC2h 25m
2026-07-17 AHY125 - Jul 17, 14:20 UTCJul 18, 13:45 UTC23h 26m
2026-07-17 AHY110 - Jul 17, 12:19 UTCJul 18, 12:00 UTC23h 41m
2026-07-17 AHY110 - Jul 17, 11:15 UTCJul 17, 14:44 UTC3h 30m
2026-07-17 AHY109 - Jul 17, 05:50 UTCJul 17, 09:50 UTC4h 0m
2026-07-16 AHY126 - Jul 16, 14:50 UTCJul 16, 16:40 UTC1h 50m
2026-07-16 AHY125 - Jul 16, 06:20 UTCJul 16, 13:30 UTC7h 10m
2026-07-15 AHY027 TBS → AYT Jul 15, 22:10 UTCJul 16, 04:45 UTC6h 35m
2026-07-15 AHY8226 TBS → TBS Jul 15, 17:40 UTCJul 15, 20:55 UTC3h 15m
2026-07-15 AHY8225 - Jul 15, 15:50 UTCJul 15, 16:20 UTC30m
2026-07-15 AHY026 - Jul 15, 08:30 UTCJul 15, 10:15 UTC1h 45m
2026-07-15 AHY025 - Jul 15, 04:40 UTCJul 15, 07:05 UTC2h 25m
2026-07-14 AHY8106 - Jul 14, 13:20 UTCJul 14, 15:10 UTC1h 50m
2026-07-14 AHY8105 - Jul 14, 11:35 UTCJul 14, 11:55 UTC20m
2026-07-14 AHY8105 - Jul 14, 09:30 UTCJul 14, 10:50 UTC1h 20m
2026-07-13 AHY8105 - Jul 13, 14:20 UTCJul 14, 10:50 UTC20h 30m
2026-07-13 AHY110 - Jul 13, 12:20 UTCJul 14, 10:50 UTC22h 30m
2026-07-13 AHY110 - Jul 13, 11:10 UTCJul 14, 10:15 UTC23h 5m
2026-07-13 AHY109 - Jul 13, 05:50 UTCJul 13, 09:45 UTC3h 55m
2026-07-12 AHY8003 - Jul 12, 16:45 UTCJul 12, 21:25 UTC4h 40m
2026-07-12 AHY036 - Jul 12, 09:50 UTCJul 12, 13:25 UTC3h 35m
2026-07-12 AHY035 - Jul 12, 03:50 UTCJul 12, 08:20 UTC4h 30m
2026-07-11 AHY026 - Jul 11, 08:15 UTCJul 11, 10:00 UTC1h 45m
2026-07-11 AHY025 - Jul 11, 04:25 UTCJul 11, 06:45 UTC2h 20m
2026-07-10 AHY026 - Jul 10, 08:15 UTCJul 10, 21:35 UTC13h 20m
2026-07-10 AHY025 - Jul 10, 04:25 UTCJul 10, 07:05 UTC2h 40m
2026-07-09 AHY8106 - Jul 9, 15:45 UTCJul 9, 17:30 UTC1h 45m
2026-07-09 AHY8105 - Jul 9, 14:10 UTCJul 9, 14:30 UTC20m
2026-07-09 AHY8105 - Jul 9, 12:10 UTCJul 9, 13:35 UTC1h 25m
2026-07-09 AHY062 - Jul 9, 08:10 UTCJul 9, 10:00 UTC1h 50m

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

Mode-S 4D2161 frequently asked

What is Mode-S code 4D2161?
4D2161 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-SEY.
Where is Mode-S 4D2161 registered?
Mode-S code 4D2161 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2161 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2161, octal 23220541, decimal 5,054,817.
What flights does 4D2161 operate?
Mode-S 4D2161 has broadcast 20 distinct callsigns, including AHY035, AHY036, AHY8003, AHY8105, AHY071.