Apparatus

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sensors Mode-S transponder

4D21EC

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D21EC
Octal
23220754
Decimal
5,054,956
Country
MT
Tail
9H-QAD
Type
B738
Broadcasting now · callsign RYR13DX · 29,875 ft
Flights observed
683
Distinct callsigns
20
Country
MT
Last broadcast
Jul 26, 22:55 UTC

Current position

4D21EC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21EC 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
RYR12RM Ryanair 21 2026-06-14
RYR8336 Ryanair 20 2026-06-13
RYR423B Ryanair 18 2026-06-14
RYR1WX Ryanair 18 2026-06-14
RYR9489 Ryanair 13 2026-06-12
RYR49CP - 13 2026-06-12
RYR957B Ryanair 12 2026-06-12
RYR882R - 11 2026-06-12
RYR35MU Ryanair 11 2026-06-12
RYR78YM Ryanair 10 2026-06-12
RYR88SE Ryanair 9 2026-06-14
RYR5411 Ryanair 9 2026-06-14
RYR8HA Ryanair 8 2026-07-26
RYR8593 Ryanair 8 2026-06-10
RYR8592 Ryanair 8 2026-06-10
RYR2LH Ryanair 8 2026-07-26
RYR99FP - 5 2026-07-10
RYR8603 Ryanair 5 2026-06-08
RYR8602 Ryanair 5 2026-06-08
RYR8599 Ryanair 5 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR7512 VGO → BCN Jul 26, 21:30 UTCJul 26, 22:50 UTC1h 20m
2026-07-26 RYR7CK LIS → BGY Jul 26, 19:20 UTCJul 26, 20:35 UTC1h 15m
2026-07-26 RYR10TB GOA → BRI Jul 26, 17:25 UTCJul 26, 18:25 UTC1h 0m
2026-07-26 RYR5WR PFO → EIN Jul 26, 15:15 UTCJul 26, 16:30 UTC1h 15m
2026-07-26 RYR6201 CTA → BRI Jul 26, 13:25 UTCJul 26, 14:10 UTC45m
2026-07-26 RYR8HA RAK → AGP Jul 26, 10:40 UTCJul 26, 12:10 UTC1h 30m
2026-07-26 RYR2LH MAN → MXP Jul 26, 08:30 UTCJul 26, 09:50 UTC1h 20m
2026-07-26 RYR3RU CRL → OPO Jul 26, 06:10 UTCJul 26, 07:30 UTC1h 21m
2026-07-26 RYR3HB CAG → FKB Jul 26, 03:55 UTCJul 26, 05:20 UTC1h 25m
2026-07-25 RYR8MJ VCE → CTA Jul 25, 22:10 UTCJul 25, 23:25 UTC1h 15m
2026-07-25 RYR48TB CTA → VCE Jul 25, 19:50 UTCJul 25, 21:15 UTC1h 25m
2026-07-25 RYR82QT DUB → SDR Jul 25, 17:40 UTCJul 25, 18:55 UTC1h 15m
2026-07-25 RYR3WM BRS → DUB Jul 25, 15:20 UTCJul 25, 16:45 UTC1h 25m
2026-07-25 RYR38XF BUD → CTA Jul 25, 12:30 UTCJul 25, 14:00 UTC1h 30m
2026-07-25 RYR6BU SVQ → SCQ Jul 25, 09:45 UTCJul 25, 11:30 UTC1h 45m
2026-07-25 RYR227P FMM → DUB Jul 25, 07:15 UTCJul 25, 08:50 UTC1h 35m
2026-07-25 RYR8VD STN → KUN Jul 25, 04:20 UTCJul 25, 06:05 UTC1h 45m
2026-07-24 RYR8HA - Jul 24, 20:45 UTCJul 24, 21:50 UTC1h 5m
2026-07-24 RYR2LH - Jul 24, 18:30 UTCJul 24, 19:50 UTC1h 20m
2026-07-24 RYR76YX AHO → CTA Jul 24, 16:25 UTCJul 24, 17:15 UTC50m
2026-07-24 RYR9123 CTA → AHO Jul 24, 14:30 UTCJul 24, 15:35 UTC1h 5m
2026-07-24 RYR7KX - Jul 24, 12:20 UTCJul 24, 12:55 UTC35m
2026-07-24 RYR1HM CTA → CAG Jul 24, 10:05 UTCJul 24, 10:40 UTC35m
2026-07-24 RYR8VE TFS → BOD Jul 24, 07:40 UTCJul 24, 09:00 UTC1h 20m
2026-07-24 RYR81WY CTA → MXP Jul 24, 05:10 UTCJul 24, 06:50 UTC1h 40m
2026-07-23 RYR4LD - Jul 23, 21:45 UTCJul 23, 22:55 UTC1h 10m
2026-07-23 RYR2UQ GOT → ZAG Jul 23, 19:20 UTCJul 23, 20:40 UTC1h 20m
2026-07-23 RYR8WW - Jul 23, 17:10 UTCJul 23, 18:25 UTC1h 15m
2026-07-23 RYR44CH - Jul 23, 14:30 UTCJul 23, 16:05 UTC1h 35m
2026-07-23 RYR8HA - Jul 23, 12:20 UTCJul 23, 13:30 UTC1h 10m
2026-07-23 RYR2LH - Jul 23, 09:50 UTCJul 23, 11:15 UTC1h 25m
2026-07-23 RYR12LP - Jul 23, 06:50 UTCJul 23, 08:40 UTC1h 50m
2026-07-23 RYR5VU EDI → NRN Jul 23, 04:15 UTCJul 23, 05:50 UTC1h 35m
2026-07-22 RYR737G MXP → CTA Jul 22, 21:35 UTCJul 22, 23:00 UTC1h 25m
2026-07-22 RYR780W CTA → MXP Jul 22, 19:05 UTCJul 22, 20:45 UTC1h 40m
2026-07-22 RYR8HA - Jul 22, 17:00 UTCJul 22, 18:05 UTC1h 5m
2026-07-22 RYR2LH - Jul 22, 14:15 UTCJul 22, 15:50 UTC1h 35m
2026-07-22 RYR4891 FCO → CTA Jul 22, 12:20 UTCJul 22, 13:05 UTC45m
2026-07-22 RYR80HG CTA → FCO Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 RYR5VU - Jul 22, 04:40 UTCJul 22, 05:25 UTC45m
2026-07-21 RYR5GF PEG → CTA Jul 21, 19:10 UTCJul 21, 20:00 UTC50m
2026-07-21 RYR12NV - Jul 21, 17:15 UTCJul 21, 18:20 UTC1h 5m
2026-07-21 RYR4891 FCO → CTA Jul 21, 15:20 UTCJul 21, 16:05 UTC45m
2026-07-21 RYR80HG CTA → FCO Jul 21, 13:15 UTCJul 21, 14:15 UTC1h 0m
2026-07-21 RYR3763 BLQ → CTA Jul 21, 10:55 UTCJul 21, 12:00 UTC1h 5m
2026-07-21 RYR3764 - Jul 21, 08:45 UTCJul 21, 10:00 UTC1h 15m
2026-07-21 RYR3RU CRL → OPO Jul 21, 06:30 UTCJul 21, 07:50 UTC1h 20m
2026-07-21 RYR3HB CAG → FKB Jul 21, 04:15 UTCJul 21, 05:30 UTC1h 15m
2026-07-20 RYR8VE - Jul 20, 21:30 UTCJul 20, 22:50 UTC1h 20m
2026-07-20 RYR81WY CTA → MXP Jul 20, 19:00 UTCJul 20, 20:35 UTC1h 35m

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

Mode-S 4D21EC frequently asked

What is Mode-S code 4D21EC?
4D21EC is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QAD.
Where is Mode-S 4D21EC registered?
Mode-S code 4D21EC is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21EC broadcasting right now?
Yes. Mode-S 4D21EC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21EC, octal 23220754, decimal 5,054,956.
What flights does 4D21EC operate?
Mode-S 4D21EC has broadcast 20 distinct callsigns, including RYR12RM, RYR8336, RYR423B, RYR1WX, RYR9489.