Apparatus

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sensors Mode-S transponder

4D221A

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D221A
Octal
23221032
Decimal
5,055,002
Country
MT
Tail
9H-QBQ
Type
B738
No current signal · last broadcast 4h ago
Flights observed
624
Distinct callsigns
20
Country
MT
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 4D221A.

Country allocation

The ICAO 24-bit address 4D221A 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
RYR769V Ryanair 6 2026-05-26
RYR15PW Ryanair 6 2026-05-26
RYR99JH Ryanair 5 2026-05-24
RYR96VH Ryanair 5 2026-04-22
RYR38LU Ryanair 5 2026-04-22
RYR15FX Ryanair 5 2026-05-24
RYR57AE Ryanair 4 2026-04-16
RYR46PL Ryanair 4 2026-06-21
RYR41ZK - 4 2026-06-13
RYR41UD Ryanair 4 2026-06-13
RYR2EE Ryanair 4 2026-04-15
RYR297X Ryanair 4 2026-05-25
RYR203A Ryanair 4 2026-05-25
RYR14KP - 4 2026-06-10
RYR95JY - 3 2026-07-14
RYR926T - 3 2026-07-14
RYR8LX Ryanair 3 2026-06-05
RYR89XQ Ryanair 3 2026-06-23
RYR88SA - 3 2026-07-13
RYR86NE Ryanair 3 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RYR1131 NUE → VLC Jul 14, 19:20 UTCJul 14, 21:25 UTC2h 5m
2026-07-14 RYR58LK - Jul 14, 13:55 UTCJul 14, 16:05 UTC2h 10m
2026-07-14 RYR5VJ FKB → VLC Jul 14, 10:45 UTCJul 14, 12:45 UTC2h 0m
2026-07-14 RYR926T - Jul 14, 08:50 UTCJul 14, 09:45 UTC55m
2026-07-14 RYR95JY - Jul 14, 06:45 UTCJul 14, 07:55 UTC1h 10m
2026-07-13 RYR48MU - Jul 13, 19:20 UTCJul 13, 21:00 UTC1h 40m
2026-07-13 RYR5VJ - Jul 13, 16:00 UTCJul 13, 18:00 UTC2h 0m
2026-07-13 RYR5076 - Jul 13, 13:20 UTCJul 13, 15:10 UTC1h 50m
2026-07-13 RYR38JR - Jul 13, 10:45 UTCJul 13, 12:30 UTC1h 45m
2026-07-13 RYR39WL - Jul 13, 07:55 UTCJul 13, 09:55 UTC2h 0m
2026-07-13 RYR88SA - Jul 13, 04:10 UTCJul 13, 06:20 UTC2h 10m
2026-07-12 RYR48BF - Jul 12, 18:05 UTCJul 12, 20:20 UTC2h 15m
2026-07-12 RYR97VJ - Jul 12, 14:25 UTCJul 12, 17:10 UTC2h 45m
2026-07-12 RYR2CP SKG → FKB Jul 12, 11:10 UTCJul 12, 13:15 UTC2h 5m
2026-07-12 RYR9957 - Jul 12, 08:25 UTCJul 12, 10:20 UTC1h 55m
2026-07-12 RYR926T - Jul 12, 06:30 UTCJul 12, 07:31 UTC1h 0m
2026-07-12 RYR95JY - Jul 12, 04:30 UTCJul 12, 05:35 UTC1h 5m
2026-07-11 RYR926T - Jul 11, 19:45 UTCJul 11, 20:45 UTC1h 0m
2026-07-11 RYR95JY - Jul 11, 17:45 UTCJul 11, 18:50 UTC1h 5m
2026-07-11 RYR39WL - Jul 11, 15:00 UTCJul 11, 16:50 UTC1h 50m
2026-07-11 RYR88SA - Jul 11, 12:00 UTCJul 11, 14:05 UTC2h 5m
2026-07-11 RYR3MW FAO → FKB Jul 11, 07:55 UTCJul 11, 10:35 UTC2h 40m
2026-07-11 RYR37UP - Jul 11, 04:35 UTCJul 11, 07:10 UTC2h 35m
2026-07-10 RYR47GL - Jul 10, 19:20 UTCJul 10, 21:50 UTC2h 30m
2026-07-10 RYR18PG - Jul 10, 15:30 UTCJul 10, 18:00 UTC2h 30m
2026-07-10 RYR15EC - Jul 10, 11:45 UTCJul 10, 13:15 UTC1h 30m
2026-07-10 RYR95WE - Jul 10, 09:05 UTCJul 10, 10:40 UTC1h 35m
2026-07-10 RYR13GN - Jul 10, 06:45 UTCJul 10, 08:10 UTC1h 25m
2026-07-10 RYR96SX - Jul 10, 04:15 UTCJul 10, 05:50 UTC1h 35m
2026-07-09 RYR5956 DBV → FKB Jul 9, 16:55 UTCJul 9, 18:30 UTC1h 35m
2026-07-09 RYR23MY - Jul 9, 14:35 UTCJul 9, 16:05 UTC1h 30m
2026-07-09 RYR9WD - Jul 9, 11:50 UTCJul 9, 13:30 UTC1h 40m
2026-07-09 RYR1WZ - Jul 9, 09:10 UTCJul 9, 10:50 UTC1h 40m
2026-07-09 RYR9209 - Jul 9, 06:30 UTCJul 9, 07:50 UTC1h 20m
2026-07-09 RYR2H - Jul 9, 04:15 UTCJul 9, 05:35 UTC1h 20m
2026-07-08 RYR9WD - Jul 8, 19:25 UTCJul 8, 21:00 UTC1h 35m
2026-07-08 RYR1WZ - Jul 8, 17:00 UTCJul 8, 18:20 UTC1h 20m
2026-07-08 RYR1WZ - Jul 8, 16:45 UTCJul 8, 16:55 UTC10m
2026-07-08 RYR9532 - Jul 8, 12:45 UTCJul 8, 14:55 UTC2h 10m
2026-07-08 RYR9533 FKB → BBU Jul 8, 09:35 UTCJul 8, 11:30 UTC1h 55m
2026-07-08 RYR1DA - Jul 8, 07:10 UTCJul 8, 08:25 UTC1h 15m
2026-07-08 RYR5GE - Jul 8, 05:20 UTCJul 8, 06:10 UTC50m
2026-07-07 RYR2CP SKG → FKB Jul 7, 18:35 UTCJul 7, 20:45 UTC2h 10m
2026-07-07 RYR9957 - Jul 7, 15:50 UTCJul 7, 17:45 UTC1h 55m
2026-07-07 RYR15EC - Jul 7, 13:10 UTCJul 7, 15:00 UTC1h 50m
2026-07-07 RYR95WE - Jul 7, 09:15 UTCJul 7, 10:50 UTC1h 35m
2026-07-07 RYR9209 - Jul 7, 06:50 UTCJul 7, 08:15 UTC1h 25m
2026-07-07 RYR2H - Jul 7, 04:35 UTCJul 7, 05:45 UTC1h 10m
2026-07-06 RYR48MU VLC → FKB Jul 6, 18:25 UTCJul 6, 20:15 UTC1h 50m
2026-07-06 RYR5VJ - Jul 6, 15:30 UTCJul 6, 17:10 UTC1h 40m

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

Mode-S 4D221A frequently asked

What is Mode-S code 4D221A?
4D221A is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QBQ.
Where is Mode-S 4D221A registered?
Mode-S code 4D221A is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D221A broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D221A, octal 23221032, decimal 5,055,002.
What flights does 4D221A operate?
Mode-S 4D221A has broadcast 20 distinct callsigns, including RYR769V, RYR15PW, RYR99JH, RYR96VH, RYR38LU.