Apparatus

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sensors Mode-S transponder

4D221D

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D221D
Octal
23221035
Decimal
5,055,005
Country
MT
Tail
9H-QBO
Type
B738
No current signal · last broadcast 2h ago
Flights observed
544
Distinct callsigns
20
Country
MT
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 4D221D.

Country allocation

The ICAO 24-bit address 4D221D 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
RYR9LC - 7 2026-07-10
RYR8BF - 5 2026-07-05
RYR7BM Ryanair 5 2026-05-22
RYR10BZ Ryanair 5 2026-05-22
RYR7GF - 4 2026-07-10
RYR78LL Ryanair 4 2026-06-07
RYR76HY Ryanair 4 2026-05-25
RYR5RC Ryanair 4 2026-05-30
RYR5MH Ryanair 4 2026-05-30
RYR5JJ - 4 2026-07-10
RYR55LG Ryanair 4 2026-05-25
RYR2Z Ryanair 4 2026-05-30
RYR2EH Ryanair 4 2026-05-31
RYR18MQ Ryanair 4 2026-05-31
RYR99LP Ryanair 3 2026-05-02
RYR94PK Ryanair 3 2026-05-02
RYR91KF Ryanair 3 2026-06-07
RYR8ST Ryanair 3 2026-06-04
RYR8932 Ryanair 3 2026-06-06
RYR85AX Ryanair 3 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RYR9EY - Jul 14, 23:10 UTCJul 15, 00:35 UTC1h 25m
2026-07-14 RYR89RA - Jul 14, 20:50 UTCJul 14, 22:10 UTC1h 20m
2026-07-14 RYR2FF - Jul 14, 18:25 UTCJul 14, 19:55 UTC1h 30m
2026-07-14 RYR411H - Jul 14, 14:45 UTCJul 14, 16:45 UTC2h 0m
2026-07-14 RYR3ZZ - Jul 14, 11:35 UTCJul 14, 13:10 UTC1h 35m
2026-07-14 RYR92KQ - Jul 14, 09:25 UTCJul 14, 10:40 UTC1h 15m
2026-07-14 RYR88DM - Jul 14, 07:20 UTCJul 14, 08:25 UTC1h 5m
2026-07-13 RYR53BM - Jul 13, 22:25 UTCJul 14, 00:45 UTC2h 20m
2026-07-13 RYR69LW - Jul 13, 18:55 UTCJul 13, 20:50 UTC1h 55m
2026-07-13 RYR423R - Jul 13, 16:30 UTCJul 13, 17:40 UTC1h 10m
2026-07-13 RYR25SX - Jul 13, 14:35 UTCJul 13, 15:40 UTC1h 5m
2026-07-13 RYR760L - Jul 13, 12:00 UTCJul 13, 13:25 UTC1h 25m
2026-07-13 RYR69XT - Jul 13, 08:30 UTCJul 13, 10:20 UTC1h 50m
2026-07-13 RYR885R - Jul 13, 05:20 UTCJul 13, 07:20 UTC2h 0m
2026-07-12 RYR68GA - Jul 12, 20:15 UTCJul 12, 21:00 UTC45m
2026-07-12 RYR60SF MXP → MAN Jul 12, 17:20 UTCJul 12, 19:05 UTC1h 45m
2026-07-12 RYR1RL OPO → MXP Jul 12, 13:30 UTCJul 12, 15:25 UTC1h 55m
2026-07-12 RYR7D MXP → OPO Jul 12, 10:01 UTCJul 12, 12:25 UTC2h 25m
2026-07-12 RYR41ZK - Jul 12, 07:20 UTCJul 12, 08:50 UTC1h 30m
2026-07-12 RYR41UD - Jul 12, 05:05 UTCJul 12, 06:30 UTC1h 25m
2026-07-11 RYR3TJ - Jul 11, 23:10 UTCJul 12, 00:35 UTC1h 25m
2026-07-11 RYR14KP - Jul 11, 20:45 UTCJul 11, 22:01 UTC1h 15m
2026-07-11 RYR65CN MAN → MXP Jul 11, 18:00 UTCJul 11, 19:40 UTC1h 40m
2026-07-11 RYR3VT MXP → MAN Jul 11, 14:40 UTCJul 11, 16:30 UTC1h 50m
2026-07-11 RYR303F BER → MXP Jul 11, 11:35 UTCJul 11, 12:50 UTC1h 15m
2026-07-11 RYR785N MXP → BER Jul 11, 09:00 UTCJul 11, 10:20 UTC1h 20m
2026-07-11 RYR6LW - Jul 11, 06:35 UTCJul 11, 07:55 UTC1h 20m
2026-07-11 RYR7YG - Jul 11, 03:55 UTCJul 11, 05:05 UTC1h 10m
2026-07-10 RYR9LC MXP → MXP Jul 10, 14:45 UTCJul 10, 23:40 UTC8h 55m
2026-07-10 RYR7GF - Jul 10, 10:40 UTCJul 10, 12:45 UTC2h 5m
2026-07-10 RYR5JJ - Jul 10, 08:10 UTCJul 10, 09:50 UTC1h 40m
2026-07-10 RYR80PC - Jul 10, 06:05 UTCJul 10, 07:05 UTC1h 0m
2026-07-10 RYR5914 - Jul 10, 04:10 UTCJul 10, 05:00 UTC50m
2026-07-09 RYR75LD VLC → MXP Jul 9, 21:40 UTCJul 9, 23:10 UTC1h 30m
2026-07-09 RYR7QQ MXP → VLC Jul 9, 18:50 UTCJul 9, 20:15 UTC1h 25m
2026-07-09 RYR3423 - Jul 9, 16:25 UTCJul 9, 17:40 UTC1h 15m
2026-07-09 RYR2632 - Jul 9, 14:20 UTCJul 9, 15:30 UTC1h 10m
2026-07-09 RYR9LC MXP → MXP Jul 9, 04:05 UTCJul 9, 13:15 UTC9h 10m
2026-07-08 RYR2HX - Jul 8, 19:05 UTCJul 8, 23:00 UTC3h 55m
2026-07-08 RYR8KH - Jul 8, 14:10 UTCJul 8, 17:45 UTC3h 35m
2026-07-08 RYR3TJ - Jul 8, 11:00 UTCJul 8, 12:25 UTC1h 25m
2026-07-08 RYR14KP - Jul 8, 08:45 UTCJul 8, 10:05 UTC1h 20m
2026-07-08 RYR7SQ - Jul 8, 06:10 UTCJul 8, 07:30 UTC1h 20m
2026-07-08 RYR4QY MXP → PMO Jul 8, 04:10 UTCJul 8, 05:25 UTC1h 15m
2026-07-07 RYR9DB - Jul 7, 19:40 UTCJul 7, 23:40 UTC4h 0m
2026-07-07 RYR9LC - Jul 7, 14:35 UTCJul 7, 18:20 UTC3h 45m
2026-07-07 RYR7GF - Jul 7, 10:40 UTCJul 7, 12:35 UTC1h 55m
2026-07-07 RYR5JJ - Jul 7, 08:00 UTCJul 7, 09:50 UTC1h 50m
2026-07-07 RYR63DH - Jul 7, 06:05 UTCJul 7, 07:10 UTC1h 5m
2026-07-07 RYR46FX - Jul 7, 04:05 UTCJul 7, 05:10 UTC1h 5m

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

Mode-S 4D221D frequently asked

What is Mode-S code 4D221D?
4D221D is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QBO.
Where is Mode-S 4D221D registered?
Mode-S code 4D221D is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D221D broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D221D, octal 23221035, decimal 5,055,005.
What flights does 4D221D operate?
Mode-S 4D221D has broadcast 20 distinct callsigns, including RYR9LC, RYR8BF, RYR7BM, RYR10BZ, RYR7GF.