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sensors Mode-S transponder

4D2237

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D2237
Octal
23221067
Decimal
5,055,031
Country
MT
Tail
9H-QAQ
Type
B738
No current signal · last broadcast 3h ago
Flights observed
485
Distinct callsigns
20
Country
MT
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4D2237.

Country allocation

The ICAO 24-bit address 4D2237 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
RYR5CW Ryanair 8 2026-05-07
RYR42CL - 8 2026-05-05
RYR23 Ryanair 7 2026-05-07
RYR86TK - 6 2026-05-06
RYR6499 Ryanair 5 2026-05-01
RYR83XN - 4 2026-07-06
RYR816C Ryanair 4 2026-04-30
RYR7HC Ryanair 4 2026-05-08
RYR76DW - 4 2026-07-06
RYR54FF Ryanair 4 2026-04-16
RYR8YU - 3 2026-07-06
RYR7VH Ryanair 3 2026-05-27
RYR7986 - 3 2026-04-14
RYR6TB Ryanair 3 2026-05-27
RYR30KM Ryanair 3 2026-05-06
RYR9MZ - 2 2026-07-09
RYR9JB Ryanair 2 2026-04-17
RYR9BY - 2 2026-07-04
RYR9796 Ryanair 2 2026-05-04
RYR8WQ - 2 2026-07-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 RYR6EW MLA → BLQ Jul 13, 21:25 UTCJul 13, 23:05 UTC1h 40m
2026-07-13 RYR822J - Jul 13, 19:20 UTCJul 13, 20:45 UTC1h 25m
2026-07-13 RYR2RW - Jul 13, 17:25 UTCJul 13, 18:15 UTC50m
2026-07-13 RYR19EW - Jul 13, 15:30 UTCJul 13, 16:15 UTC45m
2026-07-13 RYR961A - Jul 13, 11:35 UTCJul 13, 13:40 UTC2h 5m
2026-07-13 RYR7EQ - Jul 13, 08:45 UTCJul 13, 10:35 UTC1h 50m
2026-07-13 RYR9LZ - Jul 13, 06:35 UTCJul 13, 07:45 UTC1h 10m
2026-07-13 RYR32FX - Jul 13, 04:15 UTCJul 13, 05:15 UTC1h 0m
2026-07-12 RYR6128 AHO → BLQ Jul 12, 23:05 UTCJul 12, 23:55 UTC50m
2026-07-12 RYR78EZ - Jul 12, 21:35 UTCJul 12, 22:20 UTC45m
2026-07-12 RYR2FL - Jul 12, 19:05 UTCJul 12, 20:25 UTC1h 20m
2026-07-12 RYR47YB - Jul 12, 16:45 UTCJul 12, 18:05 UTC1h 20m
2026-07-12 RYR9YL - Jul 12, 14:20 UTCJul 12, 15:35 UTC1h 15m
2026-07-12 RYR5154 - Jul 12, 12:05 UTCJul 12, 13:05 UTC1h 0m
2026-07-12 RYR6EW MLA → BLQ Jul 12, 09:30 UTCJul 12, 11:01 UTC1h 30m
2026-07-12 RYR822J - Jul 12, 07:20 UTCJul 12, 08:40 UTC1h 20m
2026-07-12 RYR737 AAR → STN Jul 12, 06:10 UTCJul 12, 06:30 UTC20m
2026-07-11 RYR2979 - Jul 11, 21:05 UTCJul 11, 22:55 UTC1h 50m
2026-07-11 RYR2978 - Jul 11, 19:10 UTCJul 11, 20:20 UTC1h 10m
2026-07-11 RYR80JR - Jul 11, 15:50 UTCJul 11, 18:00 UTC2h 10m
2026-07-11 RYR16FR - Jul 11, 12:20 UTCJul 11, 14:35 UTC2h 15m
2026-07-11 RYR681R - Jul 11, 09:10 UTCJul 11, 10:05 UTC55m
2026-07-11 RYR4PH VCE → AHO Jul 11, 07:15 UTCJul 11, 08:25 UTC1h 10m
2026-07-11 RYR33TQ - Jul 11, 05:40 UTCJul 11, 06:30 UTC50m
2026-07-11 RYR824 - Jul 11, 03:50 UTCJul 11, 04:30 UTC40m
2026-07-10 RYR11TG - Jul 10, 22:45 UTCJul 10, 23:55 UTC1h 10m
2026-07-10 RYR5AZ - Jul 10, 20:50 UTCJul 10, 21:55 UTC1h 5m
2026-07-10 RYR57QU BCN → VCE Jul 10, 18:30 UTCJul 10, 19:50 UTC1h 20m
2026-07-10 RYR1FR BRU → BCN Jul 10, 15:30 UTCJul 10, 17:15 UTC1h 45m
2026-07-10 RYR87CX BCN → BRU Jul 10, 12:45 UTCJul 10, 14:25 UTC1h 40m
2026-07-10 RYR9EG ARN → BCN Jul 10, 08:15 UTCJul 10, 11:25 UTC3h 10m
2026-07-10 RYR89JJ BCN → ARN Jul 10, 04:10 UTCJul 10, 07:20 UTC3h 10m
2026-07-09 RYR3147 - Jul 9, 18:50 UTCJul 9, 20:00 UTC1h 10m
2026-07-09 RYR3147 - Jul 9, 16:45 UTCJul 9, 17:25 UTC40m
2026-07-09 RYR3146 - Jul 9, 11:10 UTCJul 9, 12:25 UTC1h 15m
2026-07-09 RYR9MZ MLA → BCN Jul 9, 07:40 UTCJul 9, 09:30 UTC1h 50m
2026-07-09 RYR83CM BCN → MLA Jul 9, 05:00 UTCJul 9, 06:50 UTC1h 50m
2026-07-08 RYR2926 BRU → BCN Jul 8, 18:35 UTCJul 8, 20:10 UTC1h 35m
2026-07-08 RYR2925 BCN → BRU Jul 8, 15:55 UTCJul 8, 17:40 UTC1h 45m
2026-07-08 RYR84AV - Jul 8, 13:25 UTCJul 8, 15:00 UTC1h 35m
2026-07-08 RYR9SU - Jul 8, 06:50 UTCJul 8, 08:10 UTC1h 20m
2026-07-08 RYR9N - Jul 8, 04:50 UTCJul 8, 06:00 UTC1h 10m
2026-07-07 RYR3XJ - Jul 7, 20:05 UTCJul 7, 20:55 UTC50m
2026-07-07 RYR97MQ - Jul 7, 18:25 UTCJul 7, 19:25 UTC1h 0m
2026-07-07 RYR6B - Jul 7, 15:20 UTCJul 7, 17:40 UTC2h 20m
2026-07-07 RYR886U - Jul 7, 11:45 UTCJul 7, 13:55 UTC2h 10m
2026-07-07 RYR1BM - Jul 7, 07:50 UTCJul 7, 10:25 UTC2h 35m
2026-07-07 RYR80FT - Jul 7, 04:45 UTCJul 7, 07:05 UTC2h 20m
2026-07-06 RYR8YU MRS → CRL Jul 6, 19:25 UTCJul 6, 20:45 UTC1h 20m
2026-07-06 RYR10VU - Jul 6, 17:30 UTCJul 6, 18:40 UTC1h 10m

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

Mode-S 4D2237 frequently asked

What is Mode-S code 4D2237?
4D2237 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QAQ.
Where is Mode-S 4D2237 registered?
Mode-S code 4D2237 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2237 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2237, octal 23221067, decimal 5,055,031.
What flights does 4D2237 operate?
Mode-S 4D2237 has broadcast 20 distinct callsigns, including RYR5CW, RYR42CL, RYR23, RYR86TK, RYR6499.