Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4D21FC

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D21FC
Octal
23220774
Decimal
5,054,972
Country
MT
Tail
9H-QAL
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
667
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S 4D21FC.

Country allocation

The ICAO 24-bit address 4D21FC 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
RYR9RA Ryanair 6 2026-05-07
RYR8RB Ryanair 6 2026-05-29
RYR83SL Ryanair 6 2026-05-06
RYR761H Ryanair 6 2026-06-04
RYR70QN Ryanair 6 2026-05-06
RYR5NB Ryanair 6 2026-06-04
RYR4PN Ryanair 6 2026-05-07
RYR39ED Ryanair 6 2026-05-07
RYR292Q Ryanair 6 2026-05-29
RYR63XE - 5 2026-05-31
RYR5AD Ryanair 5 2026-06-01
RYR52HA Ryanair 5 2026-04-18
RYR48ZK Ryanair 5 2026-05-05
RYR3UR Ryanair 5 2026-05-06
RYR32RL Ryanair 5 2026-06-03
RYR2WF Ryanair 5 2026-06-03
RYR2E Ryanair 5 2026-05-31
RYR28SP Ryanair 5 2026-06-01
RYR98KN Ryanair 4 2026-05-29
RYR89NK Ryanair 4 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR8FP PMO → VRN Jul 26, 22:05 UTCJul 26, 23:00 UTC55m
2026-07-26 RYR142H PMO → VRN Jul 26, 20:15 UTCJul 26, 21:20 UTC1h 5m
2026-07-26 RYR1PJ MLA → ATH Jul 26, 18:30 UTCJul 26, 19:05 UTC35m
2026-07-26 RYR34MP PMO → FCO Jul 26, 16:15 UTCJul 26, 16:55 UTC40m
2026-07-26 RYR86VH CRL → PMO Jul 26, 12:50 UTCJul 26, 14:45 UTC1h 55m
2026-07-26 RYR19HF PMO → CRL Jul 26, 09:55 UTCJul 26, 11:55 UTC2h 0m
2026-07-26 RYR84ZP TRN → PMO Jul 26, 07:40 UTCJul 26, 08:55 UTC1h 15m
2026-07-26 RYR114K PMO → TRN Jul 26, 05:40 UTCJul 26, 06:55 UTC1h 16m
2026-07-25 RYR12AB CDT → STN Jul 25, 21:35 UTCJul 25, 23:30 UTC1h 55m
2026-07-25 RYR94XU CAG → BVA Jul 25, 18:25 UTCJul 25, 20:35 UTC2h 10m
2026-07-25 RYR13GP - Jul 25, 16:30 UTCJul 25, 17:10 UTC40m
2026-07-25 RYR728P - Jul 25, 15:00 UTCJul 25, 15:40 UTC40m
2026-07-25 RYR86VH CRL → PMO Jul 25, 11:15 UTCJul 25, 13:05 UTC1h 50m
2026-07-25 RYR19HF PMO → CRL Jul 25, 08:25 UTCJul 25, 10:25 UTC2h 0m
2026-07-25 RYR78YR FCO → PMO Jul 25, 06:35 UTCJul 25, 07:10 UTC35m
2026-07-25 RYR34MP PMO → FCO Jul 25, 04:40 UTCJul 25, 05:25 UTC45m
2026-07-24 RYR5BC MAD → PMI Jul 24, 21:35 UTCJul 24, 22:15 UTC40m
2026-07-24 RYR23YV PMO → BRI Jul 24, 20:00 UTCJul 24, 20:40 UTC40m
2026-07-24 RYR163M VCE → PMO Jul 24, 18:05 UTCJul 24, 19:00 UTC55m
2026-07-24 RYR97BT PMO → VCE Jul 24, 16:05 UTCJul 24, 17:15 UTC1h 10m
2026-07-24 RYR7DN LEJ → DUB Jul 24, 13:35 UTCJul 24, 15:05 UTC1h 30m
2026-07-24 RYR34AH PMO → VLC Jul 24, 11:00 UTCJul 24, 12:50 UTC1h 50m
2026-07-24 RYR78YR - Jul 24, 09:35 UTCJul 24, 10:10 UTC35m
2026-07-24 RYR29SA PMO → FCO Jul 24, 07:15 UTCJul 24, 08:00 UTC45m
2026-07-23 RYR33RN STN → PMO Jul 23, 20:45 UTCJul 23, 23:00 UTC2h 15m
2026-07-23 RYR6CB SNN → LPA Jul 23, 17:20 UTCJul 23, 19:55 UTC2h 35m
2026-07-23 RYR1PJ MLA → ATH Jul 23, 15:20 UTCJul 23, 15:55 UTC35m
2026-07-23 RYR34MP PMO → FCO Jul 23, 13:20 UTCJul 23, 14:05 UTC45m
2026-07-23 RYR92JA - Jul 23, 11:05 UTCJul 23, 12:00 UTC55m
2026-07-23 RYR15XJ PMO → VRN Jul 23, 08:55 UTCJul 23, 10:10 UTC1h 15m
2026-07-23 RYR605H - Jul 23, 06:35 UTCJul 23, 07:45 UTC1h 10m
2026-07-23 RYR27QC ARN → BVA Jul 23, 04:30 UTCJul 23, 05:45 UTC1h 15m
2026-07-22 RYR89PT - Jul 22, 22:35 UTCJul 22, 23:15 UTC40m
2026-07-22 RYR21GU PMO → FCO Jul 22, 21:00 UTCJul 22, 21:40 UTC40m
2026-07-22 RYR81UZ - Jul 22, 18:50 UTCJul 22, 20:00 UTC1h 10m
2026-07-22 RYR64QD - Jul 22, 16:50 UTCJul 22, 18:10 UTC1h 20m
2026-07-22 RYR63VQ CRL → MRS Jul 22, 13:50 UTCJul 22, 15:45 UTC1h 55m
2026-07-22 RYR50PQ - Jul 22, 11:20 UTCJul 22, 13:05 UTC1h 45m
2026-07-21 RYR3CF - Jul 21, 22:25 UTCJul 21, 23:10 UTC45m
2026-07-21 RYR3788 - Jul 21, 20:55 UTCJul 21, 21:40 UTC45m
2026-07-21 RYR9CU MRS → PFO Jul 21, 17:55 UTCJul 21, 19:50 UTC1h 55m
2026-07-21 RYR57AX - Jul 21, 15:00 UTCJul 21, 17:05 UTC2h 5m
2026-07-21 RYR38DU BTS → PMO Jul 21, 11:50 UTCJul 21, 13:30 UTC1h 40m
2026-07-21 RYR646J PMO → BTS Jul 21, 09:20 UTCJul 21, 10:55 UTC1h 35m
2026-07-21 RYR27ZZ BER → AGP Jul 21, 07:05 UTCJul 21, 08:20 UTC1h 15m
2026-07-21 RYR27ZZ BER → AGP Jul 21, 06:45 UTCJul 21, 06:55 UTC10m
2026-07-21 RYR5BQ STN → BGY Jul 21, 04:35 UTCJul 21, 05:55 UTC1h 20m
2026-07-20 RYR8FP PMO → VRN Jul 20, 21:55 UTCJul 20, 23:00 UTC1h 5m
2026-07-20 RYR142H - Jul 20, 20:00 UTCJul 20, 21:10 UTC1h 10m
2026-07-20 RYR89PT - Jul 20, 18:35 UTCJul 20, 19:15 UTC40m

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

Mode-S 4D21FC frequently asked

What is Mode-S code 4D21FC?
4D21FC is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QAL.
Where is Mode-S 4D21FC registered?
Mode-S code 4D21FC is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21FC broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21FC, octal 23220774, decimal 5,054,972.
What flights does 4D21FC operate?
Mode-S 4D21FC has broadcast 20 distinct callsigns, including RYR9RA, RYR8RB, RYR83SL, RYR761H, RYR70QN.