Apparatus

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sensors Mode-S transponder

4D23FB

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D23FB
Octal
23221773
Decimal
5,055,483
Country
MT
Tail
9H-QES
Type
B738
No current signal · last broadcast Jul 26, 19:45 UTC
Flights observed
621
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 19:45 UTC

Last known position

Most recent position reported by Mode-S 4D23FB.

Country allocation

The ICAO 24-bit address 4D23FB 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
RYR9FF Ryanair 11 2026-07-26
RYR1HT Ryanair 10 2026-07-26
RYR598Z Ryanair 9 2026-07-23
RYR791X Ryanair 8 2026-07-23
RYR6HY Ryanair 8 2026-07-24
RYR4573 Ryanair 8 2026-07-24
RYR16HP Ryanair 8 2026-07-19
RYR14JJ - 8 2026-07-19
RYR619N Ryanair 7 2026-07-26
RYR18KT Ryanair 7 2026-07-26
RYR74AH Ryanair 5 2026-07-26
RYR62WX Ryanair 5 2026-07-23
RYR56GA Ryanair 5 2026-07-22
RYR4HK Ryanair 5 2026-07-26
RYR2ZA - 5 2026-07-21
RYR1UL Ryanair 5 2026-07-23
RYR1JD - 5 2026-07-22
RYR1AE - 5 2026-07-21
RYR9NC Ryanair 4 2026-07-25
RYR7WT - 4 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR9FF BTS → TPS Jul 26, 18:25 UTCJul 26, 19:45 UTC1h 20m
2026-07-26 RYR1HT GDN → BGY Jul 26, 15:50 UTCJul 26, 17:10 UTC1h 20m
2026-07-26 RYR18KT PRG → CIA Jul 26, 13:10 UTCJul 26, 14:40 UTC1h 30m
2026-07-26 RYR619N CPH → MAD Jul 26, 10:35 UTCJul 26, 12:00 UTC1h 25m
2026-07-26 RYR74AH OTP → CIA Jul 26, 07:30 UTCJul 26, 09:20 UTC1h 50m
2026-07-26 RYR4HK SOF → STN Jul 26, 04:45 UTCJul 26, 06:20 UTC1h 35m
2026-07-25 RYR288C PMI → MAD Jul 25, 17:40 UTCJul 25, 18:50 UTC1h 10m
2026-07-25 RYR29FJ STN → SOF Jul 25, 15:30 UTCJul 25, 16:40 UTC1h 10m
2026-07-25 RYR9NC FUE → BHX Jul 25, 12:25 UTCJul 25, 14:45 UTC2h 20m
2026-07-25 RYR9QX NCL → LPA Jul 25, 09:05 UTCJul 25, 11:15 UTC2h 10m
2026-07-25 RYR1NN CTA → TRN Jul 25, 05:35 UTCJul 25, 08:00 UTC2h 25m
2026-07-24 RYR9FF BTS → TPS Jul 24, 18:05 UTCJul 24, 19:30 UTC1h 25m
2026-07-24 RYR1HT GDN → BGY Jul 24, 15:55 UTCJul 24, 17:20 UTC1h 25m
2026-07-24 RYR46CZ SOF → CIA Jul 24, 13:40 UTCJul 24, 15:05 UTC1h 25m
2026-07-24 RYR6PA PMI → BRS Jul 24, 11:10 UTCJul 24, 12:35 UTC1h 25m
2026-07-24 RYR6HY LIL → MRS Jul 24, 07:35 UTCJul 24, 09:05 UTC1h 30m
2026-07-24 RYR4573 CIA → LDE Jul 24, 05:00 UTCJul 24, 06:30 UTC1h 30m
2026-07-23 RYR49TV - Jul 23, 17:10 UTCJul 23, 19:10 UTC2h 0m
2026-07-23 RYR9ZU - Jul 23, 13:35 UTCJul 23, 15:55 UTC2h 20m
2026-07-23 RYR598Z STN → CIA Jul 23, 10:25 UTCJul 23, 12:15 UTC1h 50m
2026-07-23 RYR791X BGY → AHO Jul 23, 07:15 UTCJul 23, 09:30 UTC2h 15m
2026-07-23 RYR1UL BCN → IBZ Jul 23, 05:45 UTCJul 23, 06:15 UTC30m
2026-07-23 RYR62WX CIA → CAG Jul 23, 04:05 UTCJul 23, 04:35 UTC30m
2026-07-22 RYR1JD - Jul 22, 18:50 UTCJul 22, 19:45 UTC55m
2026-07-22 RYR56GA CIA → TIA Jul 22, 16:50 UTCJul 22, 17:35 UTC45m
2026-07-22 RYR598Z STN → CIA Jul 22, 11:10 UTCJul 22, 11:50 UTC40m
2026-07-21 RYR1JD - Jul 21, 18:40 UTCJul 21, 19:35 UTC55m
2026-07-21 RYR56GA CIA → TIA Jul 21, 16:35 UTCJul 21, 17:25 UTC50m
2026-07-21 RYR1AE BTS → CIA Jul 21, 14:25 UTCJul 21, 15:35 UTC1h 10m
2026-07-21 RYR2ZA - Jul 21, 11:55 UTCJul 21, 13:10 UTC1h 15m
2026-07-21 RYR3004 - Jul 21, 08:50 UTCJul 21, 10:45 UTC1h 55m
2026-07-21 RYR77HU CIA → STN Jul 21, 05:30 UTCJul 21, 07:55 UTC2h 25m
2026-07-20 RYR18AC - Jul 20, 16:45 UTCJul 20, 18:30 UTC1h 45m
2026-07-20 RYR7WT - Jul 20, 14:20 UTCJul 20, 15:50 UTC1h 30m
2026-07-20 RYR18KT PRG → CIA Jul 20, 11:35 UTCJul 20, 13:00 UTC1h 25m
2026-07-20 RYR619N - Jul 20, 09:15 UTCJul 20, 10:35 UTC1h 20m
2026-07-20 RYR6HY LIL → MRS Jul 20, 07:00 UTCJul 20, 08:20 UTC1h 20m
2026-07-20 RYR4573 CIA → LDE Jul 20, 04:35 UTCJul 20, 06:15 UTC1h 40m
2026-07-19 RYR8114 - Jul 19, 15:40 UTCJul 19, 18:15 UTC2h 35m
2026-07-19 RYR8113 CIA → RAK Jul 19, 11:50 UTCJul 19, 14:30 UTC2h 40m
2026-07-19 RYR14JJ - Jul 19, 09:55 UTCJul 19, 10:30 UTC35m
2026-07-19 RYR16HP CIA → CAG Jul 19, 08:20 UTCJul 19, 08:50 UTC30m
2026-07-19 RYR1UL - Jul 19, 06:35 UTCJul 19, 07:05 UTC30m
2026-07-19 RYR62WX - Jul 19, 04:45 UTCJul 19, 05:15 UTC30m
2026-07-18 RYR14JJ CAG → CIA Jul 18, 18:25 UTCJul 18, 19:05 UTC40m
2026-07-18 RYR16HP - Jul 18, 17:00 UTCJul 18, 17:30 UTC30m
2026-07-18 RYR4AC NRN → RBA Jul 18, 13:40 UTCJul 18, 16:10 UTC2h 30m
2026-07-18 RYR296X - Jul 18, 10:00 UTCJul 18, 12:50 UTC2h 50m
2026-07-18 RYR9FF BTS → TPS Jul 18, 07:05 UTCJul 18, 08:25 UTC1h 20m
2026-07-18 RYR1HT GDN → BGY Jul 18, 04:45 UTCJul 18, 06:05 UTC1h 20m

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

Mode-S 4D23FB frequently asked

What is Mode-S code 4D23FB?
4D23FB is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QES.
Where is Mode-S 4D23FB registered?
Mode-S code 4D23FB is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D23FB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D23FB, octal 23221773, decimal 5,055,483.
What flights does 4D23FB operate?
Mode-S 4D23FB has broadcast 20 distinct callsigns, including RYR9FF, RYR1HT, RYR598Z, RYR791X, RYR6HY.