Apparatus

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sensors Mode-S transponder

4D2221

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D2221
Octal
23221041
Decimal
5,055,009
Country
MT
Tail
9H-QCH
Type
B738
No current signal · last broadcast 3h ago
Flights observed
581
Distinct callsigns
20
Country
MT
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4D2221.

Country allocation

The ICAO 24-bit address 4D2221 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
RYR70WZ Ryanair 4 2026-04-15
RYR68QK Ryanair 4 2026-04-30
RYR3SL - 4 2026-04-15
RYR31CD Ryanair 4 2026-05-28
RYR23VD Ryanair 4 2026-05-28
RYR9WA Ryanair 3 2026-04-30
RYR8VP - 3 2026-07-05
RYR7DM - 3 2026-07-04
RYR720F Ryanair 3 2026-05-29
RYR6MB Ryanair 3 2026-05-25
RYR2SM Ryanair 3 2026-05-29
RYR22PG - 3 2026-07-04
RYR1AA Ryanair 3 2026-05-25
RYR156P - 3 2026-07-05
RYR98RD - 2 2026-04-17
RYR97BL - 2 2026-04-13
RYR9286 - 2 2026-07-06
RYR91SU Ryanair 2 2026-05-05
RYR91CV - 2 2026-04-16
RYR908N Ryanair 2 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RYR4957 - Jul 14, 22:25 UTCJul 14, 23:40 UTC1h 14m
2026-07-14 RYR55YU - Jul 14, 20:20 UTCJul 14, 21:30 UTC1h 10m
2026-07-14 RYR6GT - Jul 14, 17:30 UTCJul 14, 19:30 UTC2h 0m
2026-07-14 RYR87XX - Jul 14, 14:30 UTCJul 14, 16:25 UTC1h 55m
2026-07-14 RYR2PQ - Jul 14, 10:15 UTCJul 14, 13:00 UTC2h 45m
2026-07-14 RYR3NR - Jul 14, 06:40 UTCJul 14, 09:10 UTC2h 30m
2026-07-13 RYR2FV - Jul 13, 16:40 UTCJul 13, 19:45 UTC3h 5m
2026-07-13 RYR9964 - Jul 13, 12:35 UTCJul 13, 15:10 UTC2h 35m
2026-07-13 RYR3185 - Jul 13, 09:50 UTCJul 13, 11:20 UTC1h 30m
2026-07-13 RYR8TP - Jul 13, 06:45 UTCJul 13, 08:25 UTC1h 40m
2026-07-13 RYR35PE BCN → VCE Jul 13, 04:25 UTCJul 13, 05:45 UTC1h 20m
2026-07-12 RYR8MB DUB → BCN Jul 12, 21:20 UTCJul 12, 23:30 UTC2h 10m
2026-07-12 RYR8NZ BER → DUB Jul 12, 18:05 UTCJul 12, 20:05 UTC2h 0m
2026-07-12 RYR749C - Jul 12, 15:30 UTCJul 12, 17:10 UTC1h 40m
2026-07-12 RYR40ND - Jul 12, 13:15 UTCJul 12, 14:35 UTC1h 20m
2026-07-12 RYR50DA - Jul 12, 11:20 UTCJul 12, 12:20 UTC1h 0m
2026-07-12 RYR47HU - Jul 12, 08:20 UTCJul 12, 09:35 UTC1h 15m
2026-07-12 RYR19WY DUB → AMS Jul 12, 06:05 UTCJul 12, 07:05 UTC1h 0m
2026-07-11 RYR97HG - Jul 11, 22:30 UTCJul 12, 00:40 UTC2h 10m
2026-07-11 RYR19PR - Jul 11, 19:05 UTCJul 11, 21:30 UTC2h 25m
2026-07-11 RYR16YG - Jul 11, 17:15 UTCJul 11, 18:10 UTC55m
2026-07-11 RYR4JT DUB → LGW Jul 11, 15:05 UTCJul 11, 16:10 UTC1h 5m
2026-07-11 RYR7ZW LGW → DUB Jul 11, 12:40 UTCJul 11, 13:50 UTC1h 10m
2026-07-11 RYR5UJ DUB → LGW Jul 11, 10:25 UTCJul 11, 11:25 UTC1h 0m
2026-07-11 RYR7FE - Jul 11, 08:05 UTCJul 11, 09:15 UTC1h 10m
2026-07-11 RYR61VB - Jul 11, 05:31 UTCJul 11, 06:50 UTC1h 20m
2026-07-10 RYR670D - Jul 10, 22:00 UTCJul 11, 00:05 UTC2h 5m
2026-07-10 RYR19PR - Jul 10, 18:55 UTCJul 10, 21:00 UTC2h 5m
2026-07-10 RYR6FH - Jul 10, 17:10 UTCJul 10, 17:45 UTC35m
2026-07-10 RYR69KF - Jul 10, 15:55 UTCJul 10, 16:30 UTC35m
2026-07-10 RYR33PC BRS → DUB Jul 10, 14:00 UTCJul 10, 14:40 UTC40m
2026-07-10 RYR565K - Jul 10, 12:25 UTCJul 10, 13:10 UTC45m
2026-07-10 RYR3QZ - Jul 10, 09:10 UTCJul 10, 11:30 UTC2h 20m
2026-07-10 RYR40TF - Jul 10, 05:40 UTCJul 10, 08:00 UTC2h 20m
2026-07-09 RYR2AF - Jul 9, 21:10 UTCJul 9, 22:50 UTC1h 40m
2026-07-09 RYR31UZ DUB → SCQ Jul 9, 18:40 UTCJul 9, 20:20 UTC1h 40m
2026-07-09 RYR292K - Jul 9, 16:05 UTCJul 9, 17:55 UTC1h 50m
2026-07-09 RYR51LL DUB → TLS Jul 9, 13:20 UTCJul 9, 15:10 UTC1h 50m
2026-07-09 RYR7ZW LGW → DUB Jul 9, 10:20 UTCJul 9, 11:20 UTC1h 0m
2026-07-09 RYR5UJ - Jul 9, 08:15 UTCJul 9, 09:10 UTC55m
2026-07-08 RYR16FR - Jul 8, 20:40 UTCJul 8, 22:50 UTC2h 10m
2026-07-08 RYR80JR - Jul 8, 17:15 UTCJul 8, 19:20 UTC2h 5m
2026-07-08 RYR16YG - Jul 8, 15:25 UTCJul 8, 16:20 UTC55m
2026-07-08 RYR4JT - Jul 8, 13:10 UTCJul 8, 14:05 UTC55m
2026-07-08 RYR891M SVQ → DUB Jul 8, 09:45 UTCJul 8, 12:05 UTC2h 20m
2026-07-08 RYR83FG - Jul 8, 06:05 UTCJul 8, 08:50 UTC2h 45m
2026-07-07 RYR23BF EDI → DUB Jul 7, 23:20 UTCJul 7, 23:55 UTC35m
2026-07-07 RYR4PP PRG → EDI Jul 7, 20:20 UTCJul 7, 22:30 UTC2h 10m
2026-07-07 RYR917L EDI → PRG Jul 7, 17:35 UTCJul 7, 19:20 UTC1h 45m
2026-07-07 RYR74EM BER → EDI Jul 7, 14:45 UTCJul 7, 16:45 UTC2h 0m

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

Mode-S 4D2221 frequently asked

What is Mode-S code 4D2221?
4D2221 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QCH.
Where is Mode-S 4D2221 registered?
Mode-S code 4D2221 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2221 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 4D2221, octal 23221041, decimal 5,055,009.
What flights does 4D2221 operate?
Mode-S 4D2221 has broadcast 20 distinct callsigns, including RYR70WZ, RYR68QK, RYR3SL, RYR31CD, RYR23VD.