Apparatus

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sensors Mode-S transponder

4D23FD

ICAO 24-bit transponder address · allocated to Malta

Currently assigned to 9H-QEU · BOEING 737-800

Hex
4D23FD
Octal
23221775
Decimal
5,055,485
Country
MT
Tail
9H-QEU
Type
B738
No current signal · last broadcast 4d ago
Flights observed
556
Distinct callsigns
20
Country
MT
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 4D23FD.

Country allocation

The ICAO 24-bit address 4D23FD 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
RYR61NG Ryanair 4 2026-06-11
RYR4D Ryanair 4 2026-04-18
RYR2YR Ryanair 4 2026-06-11
RYR9JP Ryanair 3 2026-05-03
RYR9BJ Ryanair 3 2026-04-26
RYR97ED Ryanair 3 2026-06-02
RYR95MP Ryanair 3 2026-06-07
RYR8YY Ryanair 3 2026-06-15
RYR8WT Ryanair 3 2026-06-14
RYR8RZ Ryanair 3 2026-06-07
RYR8QZ Ryanair 3 2026-04-28
RYR84AV Ryanair 3 2026-05-16
RYR77CN Ryanair 3 2026-06-15
RYR520K Ryanair 3 2026-04-28
RYR41LZ Ryanair 3 2026-06-01
RYR3NJ - 3 2026-06-14
RYR36HD Ryanair 3 2026-05-12
RYR29BA Ryanair 3 2026-05-05
RYR17UZ Ryanair 3 2026-05-12
RYR11HV Ryanair 3 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 RYR52SL SKG → SKG Jul 10, 03:15 UTCJul 10, 04:10 UTC55m
2026-07-09 RYR5004 MAD → VIE Jul 9, 19:35 UTCJul 9, 20:10 UTC35m
2026-07-09 RYR7688 - Jul 9, 17:55 UTCJul 9, 18:45 UTC50m
2026-07-09 RYR1NP - Jul 9, 16:05 UTCJul 9, 16:55 UTC50m
2026-07-09 RYR4CC - Jul 9, 13:00 UTCJul 9, 15:15 UTC2h 15m
2026-07-09 RYR1KZ SKG → EIN Jul 9, 08:35 UTCJul 9, 11:30 UTC2h 55m
2026-07-09 RYR26LR - Jul 9, 07:00 UTCJul 9, 07:50 UTC50m
2026-07-09 RYR4982 - Jul 9, 05:00 UTCJul 9, 05:55 UTC55m
2026-07-08 RYR6112 - Jul 8, 18:45 UTCJul 8, 20:25 UTC1h 40m
2026-07-08 RYR72SC - Jul 8, 07:20 UTCJul 8, 08:55 UTC1h 35m
2026-07-08 RYR41NN - Jul 8, 05:00 UTCJul 8, 06:20 UTC1h 20m
2026-07-07 RYR9538 BBU → FMM Jul 7, 16:05 UTCJul 7, 17:50 UTC1h 45m
2026-07-07 RYR3LN - Jul 7, 13:25 UTCJul 7, 15:10 UTC1h 45m
2026-07-07 RYR63UT - Jul 7, 11:10 UTCJul 7, 12:25 UTC1h 15m
2026-07-07 RYR6GM - Jul 7, 09:00 UTCJul 7, 10:00 UTC1h 0m
2026-07-07 RYR68UM - Jul 7, 06:30 UTCJul 7, 08:00 UTC1h 30m
2026-07-07 RYR2656 - Jul 7, 04:20 UTCJul 7, 05:30 UTC1h 10m
2026-07-06 RYR54JB - Jul 6, 18:25 UTCJul 6, 20:05 UTC1h 40m
2026-07-06 RYR6002 - Jul 6, 16:05 UTCJul 6, 17:40 UTC1h 35m
2026-07-06 RYR5175 - Jul 6, 13:50 UTCJul 6, 14:45 UTC55m
2026-07-06 RYR82GW - Jul 6, 12:15 UTCJul 6, 13:05 UTC50m
2026-07-06 RYR9EF - Jul 6, 08:50 UTCJul 6, 11:05 UTC2h 15m
2026-07-06 RYR92MY - Jul 6, 05:45 UTCJul 6, 08:00 UTC2h 15m
2026-07-05 RYR9538 BBU → FMM Jul 5, 16:00 UTCJul 5, 17:50 UTC1h 50m
2026-07-05 RYR3LN - Jul 5, 13:25 UTCJul 5, 15:05 UTC1h 40m
2026-07-05 RYR63UT - Jul 5, 11:20 UTCJul 5, 12:35 UTC1h 15m
2026-07-05 RYR6GM - Jul 5, 09:15 UTCJul 5, 10:10 UTC55m
2026-07-05 RYR2PC - Jul 5, 06:45 UTCJul 5, 07:55 UTC1h 10m
2026-07-05 RYR2318 - Jul 5, 04:45 UTCJul 5, 05:40 UTC55m
2026-07-04 RYR977 WRO → FMM Jul 4, 19:40 UTCJul 4, 20:45 UTC1h 5m
2026-07-04 RYR83LR BOH → WRO Jul 4, 17:00 UTCJul 4, 18:40 UTC1h 40m
2026-07-04 RYR3318 WRO → BOH Jul 4, 14:05 UTCJul 4, 16:10 UTC2h 5m
2026-07-04 RYR3YV - Jul 4, 10:05 UTCJul 4, 11:45 UTC1h 40m
2026-07-04 RYR391 - Jul 4, 06:55 UTCJul 4, 08:20 UTC1h 25m
2026-07-04 RYR301 - Jul 4, 04:10 UTCJul 4, 05:15 UTC1h 5m
2026-07-03 RYR5PV LBA → ACE Jul 3, 14:25 UTCJul 3, 16:55 UTC2h 30m
2026-07-03 RYR6DN FMM → CHQ Jul 3, 10:45 UTCJul 3, 13:05 UTC2h 20m
2026-07-03 RYR54JB - Jul 3, 06:50 UTCJul 3, 08:35 UTC1h 45m
2026-07-03 RYR6002 - Jul 3, 04:20 UTCJul 3, 06:00 UTC1h 40m
2026-07-02 RYR5175 - Jul 2, 18:10 UTCJul 2, 19:05 UTC55m
2026-07-02 RYR82GW - Jul 2, 16:35 UTCJul 2, 17:25 UTC50m
2026-07-02 RYR78UE - Jul 2, 12:55 UTCJul 2, 15:40 UTC2h 45m
2026-07-02 RYR73SV - Jul 2, 09:10 UTCJul 2, 11:40 UTC2h 30m
2026-07-02 RYR72YC FAO → LUX Jul 2, 05:45 UTCJul 2, 08:15 UTC2h 30m
2026-07-01 RYR80KP NOC → FAO Jul 1, 16:55 UTCJul 1, 19:20 UTC2h 25m
2026-07-01 RYR521W FAO → NOC Jul 1, 12:30 UTCJul 1, 15:05 UTC2h 35m
2026-07-01 RYR3HC - Jul 1, 08:45 UTCJul 1, 11:05 UTC2h 20m
2026-07-01 RYR21FN FAO → CRL Jul 1, 05:25 UTCJul 1, 07:55 UTC2h 30m
2026-06-30 RYR3HC - Jun 30, 19:10 UTCJun 30, 21:30 UTC2h 20m
2026-06-30 RYR21FN FAO → CRL Jun 30, 15:40 UTCJun 30, 18:05 UTC2h 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 9H-QEU page for operator, model, and routing details .

Mode-S 4D23FD frequently asked

What is Mode-S code 4D23FD?
4D23FD is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QEU.
Where is Mode-S 4D23FD registered?
Mode-S code 4D23FD is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D23FD broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D23FD, octal 23221775, decimal 5,055,485.
What flights does 4D23FD operate?
Mode-S 4D23FD has broadcast 20 distinct callsigns, including RYR61NG, RYR4D, RYR2YR, RYR9JP, RYR9BJ.