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sensors Mode-S transponder

400EAA

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-BYXM · GROB G-115

Hex
400EAA
Octal
20007252
Decimal
4,198,058
Country
GB
Tail
G-BYXM
Type
G115
No current signal · last broadcast Jul 24, 14:05 UTC
Flights observed
78
Distinct callsigns
20
Country
GB
Last broadcast
Jul 24, 14:05 UTC

Last known position

Most recent position reported by Mode-S 400EAA.

Country allocation

The ICAO 24-bit address 400EAA 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
NCKL64 - 14 2026-07-24
NCKL15 - 11 2026-07-15
UAO02 - 9 2026-07-17
UAO12 - 5 2026-06-10
NCKL06 - 5 2026-07-08
NCKL40 - 3 2026-07-23
NCKL25 - 3 2026-07-16
CHRWL1 - 3 2026-06-12
NCKL45 - 2 2026-07-03
NCKL44 - 2 2026-05-21
NCKL42 - 2 2026-07-14
NCKL31 - 2 2026-04-16
NCKL22 - 2 2026-06-05
NCKL13 - 2 2026-05-15
UAO450 - 1 2026-06-16
UAO444 - 1 2026-07-17
UAO24 - 1 2026-04-24
UAO06 - 1 2026-05-26
UAO01 - 1 2026-04-21
NCKL60 - 1 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 NCKL64 BEX → BEX Jul 24, 12:55 UTCJul 24, 14:05 UTC1h 10m
2026-07-24 NCKL64 - Jul 24, 11:00 UTCJul 24, 11:25 UTC25m
2026-07-24 NCKL64 BEX → BEX Jul 24, 09:05 UTCJul 24, 10:45 UTC1h 40m
2026-07-23 NCKL40 BEX → BEX Jul 23, 13:10 UTCJul 23, 15:45 UTC2h 35m
2026-07-17 NCKL64 BEX → BEX Jul 17, 13:20 UTCJul 17, 15:49 UTC2h 30m
2026-07-17 UAO444 BEX → BEX Jul 17, 10:25 UTCJul 17, 11:04 UTC40m
2026-07-17 UAO02 BEX → BEX Jul 17, 09:20 UTCJul 17, 09:45 UTC25m
2026-07-16 NCKL64 - Jul 16, 13:40 UTCJul 16, 16:00 UTC2h 20m
2026-07-16 NCKL25 - Jul 16, 10:29 UTCJul 16, 11:30 UTC1h 0m
2026-07-16 NCKL25 - Jul 16, 09:50 UTCJul 16, 10:04 UTC15m
2026-07-16 NCKL25 BEX → BEX Jul 16, 09:10 UTCJul 16, 09:30 UTC20m
2026-07-15 NCKL15 - Jul 15, 13:15 UTCJul 15, 15:50 UTC2h 35m
2026-07-15 NCKL64 BEX → BEX Jul 15, 11:15 UTCJul 15, 11:40 UTC25m
2026-07-15 NCKL64 BEX → BEX Jul 15, 09:10 UTCJul 15, 11:00 UTC1h 50m
2026-07-14 NCKL15 - Jul 14, 15:15 UTCJul 14, 16:10 UTC55m
2026-07-14 NCKL42 BEX → BEX Jul 14, 13:35 UTCJul 14, 14:15 UTC40m
2026-07-14 UAO02 BEX → BEX Jul 14, 09:20 UTCJul 14, 10:25 UTC1h 5m
2026-07-13 UAO02 - Jul 13, 14:00 UTCJul 13, 14:45 UTC45m
2026-07-13 NCKL21 - Jul 13, 12:10 UTCJul 13, 13:10 UTC1h 0m
2026-07-13 NCKL64 - Jul 13, 09:45 UTCJul 13, 11:10 UTC1h 25m
2026-07-10 NCKL16 - Jul 10, 08:50 UTCJul 10, 10:05 UTC1h 15m
2026-07-09 CHWLL02 - Jul 9, 09:45 UTCJul 9, 09:55 UTC10m
2026-07-08 NCKL06 - Jul 8, 09:05 UTCJul 8, 10:10 UTC1h 5m
2026-07-03 NCKL15 - Jul 3, 14:30 UTCJul 3, 15:20 UTC50m
2026-07-03 NCKL40 BEX → BEX Jul 3, 13:25 UTCJul 3, 14:00 UTC35m
2026-07-03 NCKL45 - Jul 3, 11:35 UTCJul 3, 12:50 UTC1h 15m
2026-07-03 NCKL64 - Jul 3, 09:25 UTCJul 3, 10:20 UTC55m
2026-07-02 NCKL30 - Jul 2, 13:55 UTCJul 2, 16:00 UTC2h 5m
2026-07-02 NCKL15 - Jul 2, 09:25 UTCJul 2, 11:45 UTC2h 20m
2026-07-01 NCKL15 BEX → BEX Jul 1, 12:45 UTCJul 1, 15:10 UTC2h 25m
2026-07-01 NCKL07 - Jul 1, 09:10 UTCJul 1, 11:20 UTC2h 10m
2026-06-22 UAO02 - Jun 22, 11:19 UTCJun 22, 12:19 UTC1h 0m
2026-06-17 UAO02 BEX → BEX Jun 17, 14:05 UTCJun 17, 15:05 UTC1h 0m
2026-06-16 UAO450 - Jun 16, 14:55 UTCJun 16, 15:50 UTC55m
2026-06-16 NCKL06 - Jun 16, 12:50 UTCJun 16, 13:50 UTC1h 0m
2026-06-16 NCKL15 - Jun 16, 09:20 UTCJun 16, 11:00 UTC1h 40m
2026-06-12 CHRWL1 - Jun 12, 11:50 UTCJun 12, 12:50 UTC1h 0m
2026-06-10 UAO12 - Jun 10, 13:10 UTCJun 10, 14:10 UTC1h 0m
2026-06-10 NCKL06 - Jun 10, 11:00 UTCJun 10, 11:35 UTC35m
2026-06-10 CHRWL1 - Jun 10, 09:30 UTCJun 10, 10:10 UTC40m
2026-06-09 UAO02 - Jun 9, 14:05 UTCJun 9, 15:35 UTC1h 30m
2026-06-09 NCKL64 BEX → BEX Jun 9, 11:45 UTCJun 9, 12:40 UTC55m
2026-06-09 CHRWL1 - Jun 9, 09:20 UTCJun 9, 10:15 UTC55m
2026-06-05 NCKL22 - Jun 5, 13:00 UTCJun 5, 15:35 UTC2h 35m
2026-06-05 NCKL53 BEX → BEX Jun 5, 08:55 UTCJun 5, 11:20 UTC2h 25m
2026-06-02 UAO02 - Jun 2, 14:45 UTCJun 2, 15:30 UTC45m
2026-06-02 UAO12 BEX → BEX Jun 2, 09:30 UTCJun 2, 10:40 UTC1h 10m
2026-06-01 NCKL15 - Jun 1, 12:50 UTCJun 1, 13:45 UTC55m
2026-05-28 NCKL64 - May 28, 14:25 UTCMay 28, 15:15 UTC50m
2026-05-28 UAO12 - May 28, 09:10 UTCMay 28, 10:15 UTC1h 5m

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 G-BYXM page for operator, model, and routing details .

Mode-S 400EAA frequently asked

What is Mode-S code 400EAA?
400EAA is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-BYXM.
Where is Mode-S 400EAA registered?
Mode-S code 400EAA 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 400EAA broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 14:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 400EAA, octal 20007252, decimal 4,198,058.
What flights does 400EAA operate?
Mode-S 400EAA has broadcast 20 distinct callsigns, including NCKL64, NCKL15, UAO02, UAO12, NCKL06.