sensors Mode-S transponder

4D2211

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D2211
Octal
23221021
Decimal
5,054,993
Country
MT
Tail
9H-QBU
Type
B738
No current signal · last broadcast 19h ago
Flights observed
14
Distinct callsigns
10
Country
MT
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S 4D2211.

Country allocation

The ICAO 24-bit address 4D2211 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 10 distinct

Callsign Airline Flights Last seen
RYR80JJ - 3 2026-04-13
RYR73VA - 2 2026-04-13
RYR44RQ - 2 2026-04-14
RYR9SE - 1 2026-04-12
RYR86GG - 1 2026-04-13
RYR66HC - 1 2026-04-12
RYR51WN - 1 2026-04-13
RYR51SL - 1 2026-04-13
RYR2KN - 1 2026-04-14
RYR15MQ Ryanair 1 2026-04-13

Recent flights last 14

DateFlightRouteTakeoffLandingDuration
2026-04-14 RYR2KN - Apr 14, 09:00 UTCApr 14, 09:05 UTC5m
2026-04-14 RYR44RQ - Apr 14, 07:10 UTCApr 14, 07:30 UTC20m
2026-04-14 RYR44RQ - Apr 14, 05:35 UTCApr 14, 07:10 UTC1h 35m
2026-04-13 RYR51SL - Apr 13, 20:10 UTCApr 13, 22:45 UTC2h 35m
2026-04-13 RYR86GG - Apr 13, 16:20 UTCApr 13, 19:00 UTC2h 40m
2026-04-13 RYR51WN - Apr 13, 13:40 UTCApr 13, 15:10 UTC1h 30m
2026-04-13 RYR80JJ - Apr 13, 12:20 UTCApr 13, 12:45 UTC25m
2026-04-13 RYR80JJ - Apr 13, 11:55 UTCApr 13, 12:45 UTC50m
2026-04-13 RYR80JJ - Apr 13, 11:15 UTCApr 13, 12:15 UTC1h 0m
2026-04-13 RYR15MQ FNI → STN Apr 13, 09:00 UTCApr 13, 10:30 UTC1h 30m
2026-04-13 RYR73VA - Apr 13, 07:55 UTCApr 13, 08:00 UTC5m
2026-04-13 RYR73VA STN → FNI Apr 13, 06:10 UTCApr 13, 08:00 UTC1h 50m
2026-04-12 RYR9SE - Apr 12, 19:20 UTCApr 12, 20:15 UTC55m
2026-04-12 RYR66HC - Apr 12, 17:25 UTCApr 12, 18:20 UTC55m

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

Mode-S 4D2211 frequently asked

What is Mode-S code 4D2211?
4D2211 is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QBU.
Where is Mode-S 4D2211 registered?
Mode-S code 4D2211 is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D2211 broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D2211, octal 23221021, decimal 5,054,993.
What flights does 4D2211 operate?
Mode-S 4D2211 has broadcast 10 distinct callsigns, including RYR80JJ, RYR73VA, RYR44RQ, RYR9SE, RYR86GG.