Apparatus

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sensors Mode-S transponder

4D21EE

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D21EE
Octal
23220756
Decimal
5,054,958
Country
MT
Tail
9H-QAF
Type
B738
Broadcasting now · callsign RYR5MP · 6,150 ft
Flights observed
653
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 20:35 UTC

Current position

4D21EE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21EE 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
RYR50DB Ryanair 6 2026-05-29
RYR41MD - 6 2026-07-19
RYR1QK Ryanair 6 2026-05-29
RYR2AT Ryanair 5 2026-05-30
RYR256T Ryanair 5 2026-05-30
RYR64CZ Ryanair 4 2026-05-29
RYR98RD - 3 2026-06-29
RYR8FY Ryanair 3 2026-06-21
RYR3RB - 3 2026-06-23
RYR34MP - 3 2026-07-06
RYR2FF - 3 2026-07-19
RYR22RD - 3 2026-06-23
RYR21LZ Ryanair 3 2026-05-21
RYR9VG Ryanair 2 2026-05-14
RYR9P Ryanair 2 2026-04-16
RYR9LR - 2 2026-07-12
RYR9JQ Ryanair 2 2026-05-20
RYR97MQ Ryanair 2 2026-06-22
RYR96RB Ryanair 2 2026-05-22
RYR969Z - 2 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR76CT FUE → CGN Jul 26, 10:35 UTCJul 26, 20:30 UTC9h 55m
2026-07-26 RYR32ED OPO → CGN Jul 26, 07:05 UTCJul 26, 09:20 UTC2h 15m
2026-07-26 RYR926K CGN → OPO Jul 26, 03:45 UTCJul 26, 05:50 UTC2h 5m
2026-07-25 RYR4JP DUB → STN Jul 25, 18:05 UTCJul 25, 22:05 UTC4h 0m
2026-07-25 RYR3136 - Jul 25, 12:40 UTCJul 25, 16:30 UTC3h 50m
2026-07-25 RYR82NW DUB → KRK Jul 25, 07:25 UTCJul 25, 09:35 UTC2h 10m
2026-07-25 RYR2GJ CGN → ALC Jul 25, 03:55 UTCJul 25, 06:25 UTC2h 30m
2026-07-24 RYR818W PFO → CGN Jul 24, 19:00 UTCJul 24, 22:50 UTC3h 50m
2026-07-24 RYR28MT CGN → PFO Jul 24, 14:10 UTCJul 24, 17:20 UTC3h 10m
2026-07-24 RYR69DC DUB → AGP Jul 24, 03:50 UTCJul 24, 12:45 UTC8h 55m
2026-07-23 RYR3933 - Jul 23, 20:35 UTCJul 23, 22:00 UTC1h 25m
2026-07-23 RYR3932 - Jul 23, 18:30 UTCJul 23, 19:35 UTC1h 5m
2026-07-23 RYR3932 - Jul 23, 17:50 UTCJul 23, 18:15 UTC25m
2026-07-23 RYR27PP ZAD → CGN Jul 23, 16:15 UTCJul 23, 17:40 UTC1h 25m
2026-07-23 RYR1HJ - Jul 23, 14:05 UTCJul 23, 15:15 UTC1h 10m
2026-07-23 RYR13ZB STN → HHN Jul 23, 11:40 UTCJul 23, 12:55 UTC1h 15m
2026-07-23 RYR89VJ CGN → BLQ Jul 23, 09:25 UTCJul 23, 10:35 UTC1h 10m
2026-07-23 RYR1AQ BCN → CGN Jul 23, 06:55 UTCJul 23, 08:45 UTC1h 50m
2026-07-23 RYR2CQ CGN → BCN Jul 23, 03:55 UTCJul 23, 05:35 UTC1h 40m
2026-07-22 RYR4JP - Jul 22, 19:15 UTCJul 22, 23:05 UTC3h 50m
2026-07-22 RYR3136 - Jul 22, 13:40 UTCJul 22, 17:45 UTC4h 5m
2026-07-22 RYR2PW - Jul 22, 10:20 UTCJul 22, 12:05 UTC1h 45m
2026-07-22 RYR5FZ KRK → VLC Jul 22, 03:50 UTCJul 22, 05:00 UTC1h 10m
2026-07-21 RYR1FB - Jul 21, 20:40 UTCJul 21, 23:10 UTC2h 30m
2026-07-21 RYR9JJ - Jul 21, 17:05 UTCJul 21, 19:35 UTC2h 30m
2026-07-21 RYR11RR ZAD → POZ Jul 21, 13:30 UTCJul 21, 16:00 UTC2h 30m
2026-07-21 RYR84QL CGN → MLA Jul 21, 10:10 UTCJul 21, 12:25 UTC2h 15m
2026-07-21 RYR9ED - Jul 21, 08:15 UTCJul 21, 09:10 UTC55m
2026-07-20 RYR1FE OPO → NUE Jul 20, 19:35 UTCJul 20, 20:15 UTC40m
2026-07-20 RYR4XC BOD → SVQ Jul 20, 18:10 UTCJul 20, 18:45 UTC35m
2026-07-20 RYR85KD TRN → STN Jul 20, 15:40 UTCJul 20, 17:20 UTC1h 40m
2026-07-20 RYR75FF - Jul 20, 11:20 UTCJul 20, 12:20 UTC1h 0m
2026-07-20 RYR5514 - Jul 20, 09:30 UTCJul 20, 10:25 UTC55m
2026-07-20 RYR53QC TIA → TRN Jul 20, 07:15 UTCJul 20, 08:50 UTC1h 35m
2026-07-20 RYR8PL BER → LIS Jul 20, 04:25 UTCJul 20, 05:35 UTC1h 10m
2026-07-19 RYR6LF - Jul 19, 22:15 UTCJul 19, 23:35 UTC1h 20m
2026-07-19 RYR41MD MXP → STN Jul 19, 19:40 UTCJul 19, 21:20 UTC1h 40m
2026-07-19 RYR2FF - Jul 19, 16:50 UTCJul 19, 18:10 UTC1h 20m
2026-07-19 RYR29AM - Jul 19, 14:30 UTCJul 19, 15:55 UTC1h 25m
2026-07-19 RYR6WD - Jul 19, 12:05 UTCJul 19, 13:30 UTC1h 25m
2026-07-19 RYR64TN BCN → STN Jul 19, 09:00 UTCJul 19, 10:50 UTC1h 50m
2026-07-19 RYR20ZE STN → BCN Jul 19, 06:05 UTCJul 19, 07:50 UTC1h 45m
2026-07-18 RYR5VL - Jul 18, 22:00 UTCJul 19, 00:05 UTC2h 5m
2026-07-18 RYR71DZ - Jul 18, 18:55 UTCJul 18, 21:00 UTC2h 5m
2026-07-18 RYR63AB - Jul 18, 16:20 UTCJul 18, 18:00 UTC1h 40m
2026-07-18 RYR9641 TLL → PFO Jul 18, 13:05 UTCJul 18, 14:45 UTC1h 40m
2026-07-18 RYR3PT - Jul 18, 09:50 UTCJul 18, 11:45 UTC1h 55m
2026-07-18 RYR54CX - Jul 18, 07:20 UTCJul 18, 09:05 UTC1h 45m
2026-07-17 RYR49EY OPO → STN Jul 17, 21:50 UTCJul 17, 23:35 UTC1h 45m
2026-07-17 RYR220U CPH → OPO Jul 17, 16:44 UTCJul 17, 19:45 UTC3h 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-QAF page for operator, model, and routing details .

Mode-S 4D21EE frequently asked

What is Mode-S code 4D21EE?
4D21EE is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QAF.
Where is Mode-S 4D21EE registered?
Mode-S code 4D21EE is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21EE broadcasting right now?
Yes. Mode-S 4D21EE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21EE, octal 23220756, decimal 5,054,958.
What flights does 4D21EE operate?
Mode-S 4D21EE has broadcast 20 distinct callsigns, including RYR50DB, RYR41MD, RYR1QK, RYR2AT, RYR256T.