Apparatus

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sensors Mode-S transponder

401128

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CBML · DE HAVILLAND DHC-6 Twin Otter

Hex
401128
Octal
20010450
Decimal
4,198,696
Country
GB
Tail
G-CBML
Type
DHC6
No current signal · last broadcast Jul 26, 18:15 UTC
Flights observed
297
Distinct callsigns
20
Country
GB
Last broadcast
Jul 26, 18:15 UTC

Last known position

Most recent position reported by Mode-S 401128.

Country allocation

The ICAO 24-bit address 401128 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
AUR501 Aurigny Air Services 32 2026-07-26
AUR502 Aurigny Air Services 28 2026-07-26
AUR506 - 23 2026-07-10
AUR505 Aurigny Air Services 23 2026-07-26
AUR205 - 18 2026-07-12
AUR202 - 18 2026-07-08
GCBML - 13 2026-07-24
AUR209 - 13 2026-07-10
AUR215 Aurigny Air Services 11 2026-07-26
AUR214 - 11 2026-07-10
AUR200 - 10 2026-07-11
IOS512N - 9 2026-07-25
AUR206 - 9 2026-07-06
IOS513P - 8 2026-07-25
IOS505F - 8 2026-07-25
IOS504E - 8 2026-07-25
AUR201 - 8 2026-07-04
AUR102P - 8 2026-06-10
IOS224 - 5 2026-06-05
AUR101P Aurigny Air Services 5 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AUR215 ACI → GCI Jul 26, 15:40 UTCJul 26, 18:15 UTC2h 35m
2026-07-26 AUR505 ACI → SOU Jul 26, 14:30 UTCJul 26, 15:30 UTC1h 0m
2026-07-26 AUR502 SOU → ACI Jul 26, 13:10 UTCJul 26, 13:50 UTC40m
2026-07-26 AUR501 ACI → SOU Jul 26, 11:50 UTCJul 26, 12:35 UTC45m
2026-07-26 AUR103P SOU → GCI Jul 26, 10:20 UTCJul 26, 11:15 UTC55m
2026-07-25 IOS513P - Jul 25, 13:15 UTCJul 25, 14:00 UTC45m
2026-07-25 IOS512N - Jul 25, 11:50 UTCJul 25, 12:25 UTC35m
2026-07-25 IOS505F - Jul 25, 10:00 UTCJul 25, 10:40 UTC40m
2026-07-25 IOS504E - Jul 25, 08:35 UTCJul 25, 09:15 UTC40m
2026-07-24 IOS513P - Jul 24, 13:15 UTCJul 24, 13:55 UTC40m
2026-07-24 IOS512N - Jul 24, 11:55 UTCJul 24, 12:35 UTC40m
2026-07-24 IOS505F - Jul 24, 10:00 UTCJul 24, 10:45 UTC45m
2026-07-24 IOS504E - Jul 24, 08:35 UTCJul 24, 09:15 UTC40m
2026-07-24 GCBML - Jul 24, 07:35 UTCJul 24, 07:50 UTC15m
2026-07-23 IOS513P - Jul 23, 13:00 UTCJul 23, 13:35 UTC35m
2026-07-23 IOS512N - Jul 23, 11:40 UTCJul 23, 12:25 UTC45m
2026-07-23 IOS505F - Jul 23, 09:50 UTCJul 23, 10:30 UTC40m
2026-07-23 IOS504E - Jul 23, 08:25 UTCJul 23, 09:10 UTC45m
2026-07-21 GCBML - Jul 21, 12:15 UTCJul 21, 12:25 UTC10m
2026-07-21 GCBML - Jul 21, 11:25 UTCJul 21, 11:35 UTC10m
2026-07-21 GCBML - Jul 21, 07:25 UTCJul 21, 08:45 UTC1h 20m
2026-07-20 IOS513P - Jul 20, 13:55 UTCJul 20, 14:35 UTC40m
2026-07-20 IOS512N - Jul 20, 12:30 UTCJul 20, 13:15 UTC45m
2026-07-20 IOS505F - Jul 20, 10:45 UTCJul 20, 11:30 UTC45m
2026-07-20 IOS504E - Jul 20, 09:10 UTCJul 20, 10:00 UTC50m
2026-07-13 IOS512N - Jul 13, 11:45 UTCJul 13, 13:50 UTC2h 5m
2026-07-13 IOS505F - Jul 13, 10:05 UTCJul 13, 10:45 UTC40m
2026-07-13 IOS504E - Jul 13, 08:40 UTCJul 13, 09:35 UTC55m
2026-07-12 AUR104P - Jul 12, 14:50 UTCJul 12, 15:45 UTC55m
2026-07-12 AUR205 - Jul 12, 14:10 UTCJul 12, 14:45 UTC35m
2026-07-12 AUR502 GCI → ACI Jul 12, 11:10 UTCJul 12, 13:35 UTC2h 25m
2026-07-11 AUR205 - Jul 11, 11:20 UTCJul 11, 11:35 UTC15m
2026-07-11 AUR502 SOU → ACI Jul 11, 10:00 UTCJul 11, 10:45 UTC45m
2026-07-11 AUR501 - Jul 11, 08:40 UTCJul 11, 09:15 UTC35m
2026-07-11 AUR200 - Jul 11, 06:20 UTCJul 11, 08:01 UTC1h 40m
2026-07-10 AUR214 - Jul 10, 17:20 UTCJul 10, 18:05 UTC45m
2026-07-10 AUR209 - Jul 10, 16:05 UTCJul 10, 16:20 UTC15m
2026-07-10 AUR506 SOU → ACI Jul 10, 14:50 UTCJul 10, 15:30 UTC40m
2026-07-10 AUR505 - Jul 10, 12:50 UTCJul 10, 14:20 UTC1h 30m
2026-07-09 AUR209 - Jul 9, 16:45 UTCJul 9, 18:40 UTC1h 55m
2026-07-09 AUR103P - Jul 9, 15:15 UTCJul 9, 16:10 UTC55m
2026-07-09 GCBML - Jul 9, 07:45 UTCJul 9, 09:20 UTC1h 35m
2026-07-08 AUR104P - Jul 8, 13:00 UTCJul 8, 14:00 UTC1h 0m
2026-07-08 AUR205 - Jul 8, 11:40 UTCJul 8, 12:00 UTC20m
2026-07-08 AUR502 - Jul 8, 10:25 UTCJul 8, 11:05 UTC40m
2026-07-08 AUR501 - Jul 8, 08:45 UTCJul 8, 09:20 UTC35m
2026-07-08 AUR202 GCI → ACI Jul 8, 06:30 UTCJul 8, 08:10 UTC1h 40m
2026-07-07 AUR205 ACI → GCI Jul 7, 12:05 UTCJul 7, 12:30 UTC25m
2026-07-07 AUR502 SOU → ACI Jul 7, 10:55 UTCJul 7, 11:30 UTC35m
2026-07-07 AUR501 - Jul 7, 09:40 UTCJul 7, 10:15 UTC35m

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

Mode-S 401128 frequently asked

What is Mode-S code 401128?
401128 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CBML.
Where is Mode-S 401128 registered?
Mode-S code 401128 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 401128 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 401128, octal 20010450, decimal 4,198,696.
What flights does 401128 operate?
Mode-S 401128 has broadcast 20 distinct callsigns, including AUR501, AUR502, AUR506, AUR505, AUR205.