Apparatus

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sensors Mode-S transponder

4D21EB

ICAO 24-bit transponder address · allocated to Malta

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

Hex
4D21EB
Octal
23220753
Decimal
5,054,955
Country
MT
Tail
9H-QAC
Type
B738
Broadcasting now · callsign RYR26TR · 37,000 ft
Flights observed
610
Distinct callsigns
20
Country
MT
Last broadcast
1h ago

Current position

4D21EB is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4D21EB 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
RYR7RP Ryanair 6 2026-05-27
RYR2P Ryanair 6 2026-05-27
RYR26NK Ryanair 6 2026-05-27
RYR21DP Ryanair 6 2026-05-27
RYR93WR Ryanair 4 2026-05-27
RYR74RR Ryanair 4 2026-06-06
RYR70NK Ryanair 4 2026-06-06
RYR5G Ryanair 4 2026-05-31
RYR4FD Ryanair 4 2026-05-01
RYR32FV Ryanair 4 2026-05-27
RYR13VP Ryanair 4 2026-05-31
RYR966P Ryanair 3 2026-05-19
RYR886U - 3 2026-06-23
RYR80KA - 3 2026-07-12
RYR7DU Ryanair 3 2026-05-02
RYR7CW Ryanair 3 2026-06-17
RYR76HY - 3 2026-06-25
RYR6B - 3 2026-06-23
RYR63CZ - 3 2026-06-28
RYR61AT - 3 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 RYR7LQ - Jul 15, 10:30 UTCJul 15, 12:30 UTC2h 0m
2026-07-15 RYR466M - Jul 15, 07:30 UTCJul 15, 09:10 UTC1h 40m
2026-07-15 RYR17XU - Jul 15, 05:30 UTCJul 15, 06:25 UTC55m
2026-07-15 RYR29BC - Jul 15, 03:45 UTCJul 15, 04:35 UTC50m
2026-07-14 RYR5ZL - Jul 14, 20:30 UTCJul 14, 21:30 UTC1h 0m
2026-07-14 RYR95AT - Jul 14, 18:55 UTCJul 14, 19:50 UTC55m
2026-07-14 RYR3WM - Jul 14, 16:50 UTCJul 14, 18:10 UTC1h 20m
2026-07-14 RYR82QT - Jul 14, 14:25 UTCJul 14, 15:40 UTC1h 15m
2026-07-14 RYR6WA - Jul 14, 11:20 UTCJul 14, 13:15 UTC1h 55m
2026-07-14 RYR4SV - Jul 14, 07:45 UTCJul 14, 09:35 UTC1h 50m
2026-07-14 RYR1JR - Jul 14, 04:10 UTCJul 14, 06:25 UTC2h 15m
2026-07-13 RYR5685 - Jul 13, 19:45 UTCJul 13, 22:15 UTC2h 30m
2026-07-13 RYR49TL MAD → EDI Jul 13, 16:30 UTCJul 13, 18:45 UTC2h 15m
2026-07-13 RYR6TB - Jul 13, 14:15 UTCJul 13, 15:20 UTC1h 5m
2026-07-13 RYR7VH - Jul 13, 12:25 UTCJul 13, 13:25 UTC1h 0m
2026-07-13 RYR31JD PRG → MAD Jul 13, 07:55 UTCJul 13, 10:35 UTC2h 40m
2026-07-13 RYR83RW - Jul 13, 04:30 UTCJul 13, 06:40 UTC2h 10m
2026-07-12 RYR48YA - Jul 12, 20:50 UTCJul 12, 23:00 UTC2h 10m
2026-07-12 RYR14MJ - Jul 12, 17:40 UTCJul 12, 19:55 UTC2h 15m
2026-07-12 RYR96TN TRN → PSR Jul 12, 16:01 UTCJul 12, 16:55 UTC55m
2026-07-12 RYR9KB STN → PMO Jul 12, 14:15 UTCJul 12, 15:15 UTC1h 0m
2026-07-12 RYR10UK - Jul 12, 11:20 UTCJul 12, 12:50 UTC1h 30m
2026-07-12 RYR80KA - Jul 12, 08:45 UTCJul 12, 10:30 UTC1h 45m
2026-07-12 RYR83AU MXP → PSR Jul 12, 07:01 UTCJul 12, 07:50 UTC50m
2026-07-12 RYR5XE - Jul 12, 05:01 UTCJul 12, 05:55 UTC55m
2026-07-11 RYR744U - Jul 11, 20:25 UTCJul 11, 21:35 UTC1h 10m
2026-07-11 RYR5YG - Jul 11, 18:30 UTCJul 11, 19:35 UTC1h 5m
2026-07-11 RYR4NU - Jul 11, 16:05 UTCJul 11, 17:30 UTC1h 25m
2026-07-11 RYR2MW - Jul 11, 14:00 UTCJul 11, 15:15 UTC1h 15m
2026-07-11 RYR6411 KUN → PSR Jul 11, 10:35 UTCJul 11, 12:40 UTC2h 5m
2026-07-11 RYR6412 - Jul 11, 07:35 UTCJul 11, 09:35 UTC2h 0m
2026-07-11 RYR2HQ - Jul 11, 05:31 UTCJul 11, 06:25 UTC55m
2026-07-11 RYR89GT - Jul 11, 03:40 UTCJul 11, 04:35 UTC55m
2026-07-10 RYR6405 - Jul 10, 20:50 UTCJul 10, 21:45 UTC55m
2026-07-10 RYR67HC - Jul 10, 19:15 UTCJul 10, 20:10 UTC55m
2026-07-10 RYR10UK - Jul 10, 16:50 UTCJul 10, 18:25 UTC1h 35m
2026-07-10 RYR80KA - Jul 10, 14:10 UTCJul 10, 15:50 UTC1h 40m
2026-07-09 RYR23BM - Jul 9, 20:45 UTCJul 9, 21:30 UTC45m
2026-07-09 RYR9081 - Jul 9, 18:35 UTCJul 9, 19:35 UTC1h 0m
2026-07-09 RYR74RW KRK → PSR Jul 9, 16:30 UTCJul 9, 17:45 UTC1h 15m
2026-07-09 RYR88TZ - Jul 9, 14:15 UTCJul 9, 15:40 UTC1h 25m
2026-07-09 RYR9368 BCN → BLQ Jul 9, 12:25 UTCJul 9, 13:15 UTC50m
2026-07-09 RYR9367 BLQ → BCN Jul 9, 10:45 UTCJul 9, 11:35 UTC50m
2026-07-09 RYR10UK - Jul 9, 07:45 UTCJul 9, 09:20 UTC1h 35m
2026-07-09 RYR80KA - Jul 9, 05:00 UTCJul 9, 06:40 UTC1h 40m
2026-07-08 RYR4NU - Jul 8, 21:15 UTCJul 8, 22:45 UTC1h 30m
2026-07-08 RYR2MW - Jul 8, 19:00 UTCJul 8, 20:25 UTC1h 25m
2026-07-08 RYR589U CTA → PSR Jul 8, 17:25 UTCJul 8, 18:20 UTC55m
2026-07-08 RYR9389 BCN → EMA Jul 8, 15:30 UTCJul 8, 16:25 UTC55m
2026-07-08 RYR2056 AGA → VIE Jul 8, 13:35 UTCJul 8, 14:30 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-QAC page for operator, model, and routing details .

Mode-S 4D21EB frequently asked

What is Mode-S code 4D21EB?
4D21EB is an ICAO 24-bit transponder address. Allocated to Malta. Assigned to 9H-QAC.
Where is Mode-S 4D21EB registered?
Mode-S code 4D21EB is allocated to Malta (MT). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4D21EB broadcasting right now?
Yes. Mode-S 4D21EB is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4D21EB, octal 23220753, decimal 5,054,955.
What flights does 4D21EB operate?
Mode-S 4D21EB has broadcast 20 distinct callsigns, including RYR7RP, RYR2P, RYR26NK, RYR21DP, RYR93WR.