Apparatus

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sensors Mode-S transponder

43C5EF

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to ZM421 · AIRBUS A-400M

Hex
43C5EF
Octal
20742757
Decimal
4,441,583
Country
GB
Tail
ZM421
Type
A400
No current signal · last broadcast 8h ago
Flights observed
119
Distinct callsigns
20
Country
GB
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 43C5EF.

Country allocation

The ICAO 24-bit address 43C5EF falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom 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
JIGSW94 - 13 2026-06-16
RONIN30 - 5 2026-05-26
BLBRD33 - 5 2026-06-25
RONIN32 - 4 2026-05-13
TRUSK62 - 3 2026-05-29
RRR4269 - 3 2026-04-16
RRR4207 - 3 2026-04-13
RRR4204 - 3 2026-06-17
RONIN31 - 3 2026-05-18
BLBRD35 - 3 2026-06-26
TRUSK61 - 2 2026-07-07
RRR4989 - 2 2026-05-11
RRR4953 - 2 2026-06-14
RRR4252 - 2 2026-04-28
RRR4213 - 2 2026-04-17
RRR4212 - 2 2026-04-17
RRR4203 - 2 2026-06-05
RRR4200 - 2 2026-06-04
RRR4152 - 2 2026-05-31
RRR4131 - 2 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 GRZLY80 - Jul 13, 20:55 UTCJul 13, 23:35 UTC2h 40m
2026-07-08 RRR80 - Jul 8, 09:10 UTCJul 8, 13:00 UTC3h 50m
2026-07-07 TRUSK61 - Jul 7, 21:25 UTCJul 7, 23:55 UTC2h 30m
2026-06-30 CNTOR62 - Jun 30, 20:50 UTCJun 30, 23:20 UTC2h 30m
2026-06-30 COM452 - Jun 30, 14:55 UTCJun 30, 18:35 UTC3h 40m
2026-06-30 BLNHM31 - Jun 30, 12:45 UTCJun 30, 13:35 UTC50m
2026-06-30 BLNHM31 - Jun 30, 08:30 UTCJun 30, 10:40 UTC2h 10m
2026-06-29 ARKTS41 - Jun 29, 20:04 UTCJun 29, 23:39 UTC3h 35m
2026-06-29 NAPIR70 - Jun 29, 14:34 UTCJun 29, 17:49 UTC3h 15m
2026-06-29 BLNHM30 - Jun 29, 11:10 UTCJun 29, 12:45 UTC1h 35m
2026-06-29 BLNHM30 - Jun 29, 08:24 UTCJun 29, 09:20 UTC55m
2026-06-26 BLBRD35 - Jun 26, 15:05 UTCJun 26, 16:00 UTC55m
2026-06-26 BLBRD35 - Jun 26, 12:59 UTCJun 26, 13:10 UTC10m
2026-06-26 BLBRD35 - Jun 26, 11:55 UTCJun 26, 12:10 UTC15m
2026-06-25 BLBRD33 - Jun 25, 14:44 UTCJun 25, 16:09 UTC1h 25m
2026-06-25 BLBRD33 - Jun 25, 13:50 UTCJun 25, 14:09 UTC20m
2026-06-25 BLBRD33 - Jun 25, 11:54 UTCJun 25, 12:50 UTC55m
2026-06-24 NAPER72 - Jun 24, 09:39 UTCJun 24, 13:30 UTC3h 50m
2026-06-23 BLBRD31 - Jun 23, 15:34 UTCJun 23, 19:10 UTC3h 35m
2026-06-21 GRZLY87 - Jun 21, 12:55 UTCJun 21, 13:39 UTC45m
2026-06-21 GRZLY85 - Jun 21, 10:25 UTCJun 21, 12:24 UTC2h 0m
2026-06-17 PLMTR44 - Jun 17, 21:00 UTCJun 17, 23:45 UTC2h 45m
2026-06-17 RRR4204 - Jun 17, 14:30 UTCJun 17, 17:10 UTC2h 40m
2026-06-17 RRR4204 WTN → KEF Jun 17, 10:40 UTCJun 17, 13:10 UTC2h 30m
2026-06-17 RRR4204 - Jun 17, 07:55 UTCJun 17, 08:30 UTC35m
2026-06-16 TRUSK63 - Jun 16, 21:10 UTCJun 17, 01:00 UTC3h 50m
2026-06-16 DRDNT41 - Jun 16, 18:05 UTCJun 16, 19:10 UTC1h 5m
2026-06-16 DRDNT41 - Jun 16, 15:15 UTCJun 16, 17:15 UTC2h 0m
2026-06-16 JIGSW94 - Jun 16, 08:20 UTCJun 16, 10:55 UTC2h 35m
2026-06-15 FLTOT40 - Jun 15, 20:34 UTCJun 15, 22:10 UTC1h 35m
2026-06-15 FLTOT40 - Jun 15, 19:10 UTCJun 15, 19:50 UTC40m
2026-06-15 ASLAN70 - Jun 15, 16:30 UTCJun 15, 17:40 UTC1h 10m
2026-06-15 ASLAN70 - Jun 15, 13:54 UTCJun 15, 14:40 UTC45m
2026-06-15 JIGSW93 - Jun 15, 08:15 UTCJun 15, 12:00 UTC3h 45m
2026-06-14 RRR4953 RZE → BZZ Jun 14, 16:25 UTCJun 14, 19:25 UTC3h 0m
2026-06-14 RRR4952 - Jun 14, 11:50 UTCJun 14, 14:10 UTC2h 20m
2026-06-05 RRR4203 - Jun 5, 14:20 UTCJun 5, 14:30 UTC10m
2026-06-05 RRR4203 - Jun 5, 12:30 UTCJun 5, 13:25 UTC55m
2026-06-05 RRR4202 - Jun 5, 06:55 UTCJun 5, 07:50 UTC55m
2026-06-04 RRR4201 - Jun 4, 15:40 UTCJun 4, 18:50 UTC3h 10m
2026-06-04 RRR4200 - Jun 4, 09:25 UTCJun 4, 12:25 UTC3h 0m
2026-06-04 RRR4200 - Jun 4, 07:25 UTCJun 4, 07:55 UTC30m
2026-05-31 RRR4153 - May 31, 14:55 UTCMay 31, 15:40 UTC45m
2026-05-31 RRR4152 - May 31, 13:00 UTCMay 31, 14:00 UTC1h 0m
2026-05-31 RRR4152 - May 31, 09:30 UTCMay 31, 10:00 UTC30m
2026-05-29 BLNHM33 BZZ → BZZ May 29, 15:00 UTCMay 29, 19:35 UTC4h 35m
2026-05-29 TRUSK62 - May 29, 12:45 UTCMay 29, 13:20 UTC35m
2026-05-29 TRUSK62 - May 29, 11:05 UTCMay 29, 12:10 UTC1h 5m
2026-05-29 TRUSK62 - May 29, 09:25 UTCMay 29, 10:25 UTC1h 0m
2026-05-28 FLTOT43 - May 28, 17:35 UTCMay 28, 21:30 UTC3h 55m

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 ZM421 page for operator, model, and routing details .

Mode-S 43C5EF frequently asked

What is Mode-S code 43C5EF?
43C5EF is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to ZM421.
Where is Mode-S 43C5EF registered?
Mode-S code 43C5EF is allocated to United Kingdom (GB). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 43C5EF broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 43C5EF, octal 20742757, decimal 4,441,583.
What flights does 43C5EF operate?
Mode-S 43C5EF has broadcast 20 distinct callsigns, including JIGSW94, RONIN30, BLBRD33, RONIN32, TRUSK62.