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sensors Mode-S transponder

40812C

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CNLL · AGUSTA AW-169

Hex
40812C
Octal
20100454
Decimal
4,227,372
Country
GB
Tail
G-CNLL
Type
A169
No current signal · last broadcast Jul 26, 20:45 UTC
Flights observed
170
Distinct callsigns
2
Country
GB
Last broadcast
Jul 26, 20:45 UTC

Last known position

Most recent position reported by Mode-S 40812C.

Country allocation

The ICAO 24-bit address 40812C 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 2 distinct

Callsign Airline Flights Last seen
HLE01 - 166 2026-07-26
HLE20 - 4 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HLE01 - Jul 26, 20:25 UTCJul 26, 20:45 UTC20m
2026-07-26 HLE01 - Jul 26, 16:10 UTCJul 26, 16:20 UTC10m
2026-07-26 HLE01 - Jul 26, 13:50 UTCJul 26, 14:05 UTC15m
2026-07-26 HLE01 - Jul 26, 12:20 UTCJul 26, 12:30 UTC10m
2026-07-26 HLE01 - Jul 26, 10:45 UTCJul 26, 10:55 UTC10m
2026-07-20 HLE01 - Jul 20, 15:10 UTCJul 20, 16:00 UTC50m
2026-07-20 HLE01 - Jul 20, 14:15 UTCJul 20, 14:35 UTC20m
2026-07-20 HLE01 - Jul 20, 11:40 UTCJul 20, 13:20 UTC1h 40m
2026-07-20 HLE01 - Jul 20, 10:30 UTCJul 20, 10:40 UTC10m
2026-07-19 HLE01 LEQ → NQY Jul 19, 18:20 UTCJul 19, 19:00 UTC40m
2026-07-19 HLE01 - Jul 19, 17:25 UTCJul 19, 17:35 UTC10m
2026-07-19 HLE01 - Jul 19, 16:20 UTCJul 19, 16:40 UTC20m
2026-07-19 HLE01 - Jul 19, 13:05 UTCJul 19, 13:30 UTC25m
2026-07-19 HLE01 - Jul 19, 01:40 UTCJul 19, 01:55 UTC15m
2026-07-19 HLE01 - Jul 19, 00:45 UTCJul 19, 01:05 UTC20m
2026-07-18 HLE01 - Jul 18, 21:40 UTCJul 18, 22:10 UTC30m
2026-07-18 HLE01 - Jul 18, 19:40 UTCJul 18, 20:00 UTC20m
2026-07-18 HLE01 - Jul 18, 12:15 UTCJul 18, 12:30 UTC15m
2026-07-18 HLE01 - Jul 18, 07:25 UTCJul 18, 08:15 UTC50m
2026-07-17 HLE01 NQY → NQY Jul 17, 21:20 UTCJul 17, 22:35 UTC1h 15m
2026-07-17 HLE01 - Jul 17, 19:15 UTCJul 17, 19:35 UTC20m
2026-07-17 HLE01 - Jul 17, 17:55 UTCJul 17, 18:44 UTC50m
2026-07-17 HLE01 NQY → NQY Jul 17, 09:04 UTCJul 17, 09:35 UTC30m
2026-07-16 HLE01 NQY → NQY Jul 16, 21:45 UTCJul 16, 23:10 UTC1h 25m
2026-07-16 HLE01 - Jul 16, 20:00 UTCJul 16, 20:19 UTC20m
2026-07-16 HLE01 - Jul 16, 18:44 UTCJul 16, 19:30 UTC45m
2026-07-16 HLE01 - Jul 16, 10:59 UTCJul 16, 12:25 UTC1h 25m
2026-07-16 HLE01 - Jul 16, 10:00 UTCJul 16, 10:10 UTC10m
2026-07-15 HLE01 - Jul 15, 15:10 UTCJul 15, 15:50 UTC40m
2026-07-15 HLE01 - Jul 15, 12:50 UTCJul 15, 14:55 UTC2h 5m
2026-07-15 HLE01 - Jul 15, 10:40 UTCJul 15, 10:55 UTC15m
2026-07-15 HLE01 - Jul 15, 09:50 UTCJul 15, 10:10 UTC20m
2026-07-15 HLE01 - Jul 15, 08:40 UTCJul 15, 09:15 UTC35m
2026-07-14 HLE01 - Jul 14, 17:40 UTCJul 14, 17:55 UTC15m
2026-07-14 HLE01 - Jul 14, 15:10 UTCJul 14, 16:00 UTC50m
2026-07-07 HLE01 - Jul 7, 19:00 UTCJul 7, 19:25 UTC25m
2026-07-07 HLE01 - Jul 7, 18:00 UTCJul 7, 18:15 UTC15m
2026-07-07 HLE01 NQY → NQY Jul 7, 16:55 UTCJul 7, 17:25 UTC30m
2026-07-07 HLE01 - Jul 7, 12:40 UTCJul 7, 12:45 UTC5m
2026-07-07 HLE01 - Jul 7, 11:35 UTCJul 7, 11:50 UTC15m
2026-07-07 HLE01 - Jul 7, 10:20 UTCJul 7, 10:35 UTC15m
2026-07-06 HLE01 - Jul 6, 19:20 UTCJul 6, 19:35 UTC15m
2026-07-06 HLE01 - Jul 6, 18:35 UTCJul 6, 18:45 UTC10m
2026-07-06 HLE01 - Jul 6, 17:45 UTCJul 6, 18:00 UTC15m
2026-07-06 HLE01 NQY → NQY Jul 6, 12:25 UTCJul 6, 12:35 UTC10m
2026-07-04 HLE01 - Jul 4, 16:10 UTCJul 4, 16:25 UTC15m
2026-07-03 HLE01 - Jul 3, 13:30 UTCJul 3, 13:55 UTC25m
2026-07-03 HLE01 - Jul 3, 11:50 UTCJul 3, 12:15 UTC25m
2026-07-03 HLE01 - Jul 3, 10:00 UTCJul 3, 10:10 UTC10m
2026-07-02 HLE01 - Jul 2, 21:15 UTCJul 2, 21:30 UTC15m

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

Mode-S 40812C frequently asked

What is Mode-S code 40812C?
40812C is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CNLL.
Where is Mode-S 40812C registered?
Mode-S code 40812C 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 40812C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40812C, octal 20100454, decimal 4,227,372.
What flights does 40812C operate?
Mode-S 40812C has broadcast 2 distinct callsigns, including HLE01, HLE20.