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sensors Mode-S transponder

406CA0

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-HEMC · AIRBUS HELICOPTERS EC-145

Hex
406CA0
Octal
20066240
Decimal
4,222,112
Country
GB
Tail
G-HEMC
Type
EC45
No current signal · last broadcast 1d ago
Flights observed
112
Distinct callsigns
4
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 406CA0.

Country allocation

The ICAO 24-bit address 406CA0 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 4 distinct

Callsign Airline Flights Last seen
HLE85 - 94 2026-07-12
HLE88 - 9 2026-04-17
RHD08 - 7 2026-06-18
RHD72 - 2 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 HLE85 - Jul 12, 21:10 UTCJul 12, 21:40 UTC30m
2026-07-12 HLE85 NWI → NWI Jul 12, 15:45 UTCJul 12, 16:20 UTC35m
2026-07-12 HLE85 - Jul 12, 11:35 UTCJul 12, 13:15 UTC1h 40m
2026-07-12 HLE85 - Jul 12, 10:15 UTCJul 12, 10:30 UTC15m
2026-07-12 HLE85 - Jul 12, 07:31 UTCJul 12, 07:40 UTC10m
2026-07-11 HLE85 NWI → NWI Jul 11, 16:05 UTCJul 11, 16:25 UTC20m
2026-07-11 HLE85 - Jul 11, 12:45 UTCJul 11, 13:45 UTC1h 0m
2026-07-11 HLE85 - Jul 11, 11:00 UTCJul 11, 11:55 UTC55m
2026-07-09 HLE85 - Jul 9, 14:45 UTCJul 9, 14:55 UTC10m
2026-07-09 HLE85 - Jul 9, 13:25 UTCJul 9, 13:35 UTC10m
2026-07-09 HLE85 - Jul 9, 11:40 UTCJul 9, 11:50 UTC10m
2026-07-09 HLE85 - Jul 9, 09:00 UTCJul 9, 09:10 UTC10m
2026-07-08 HLE85 - Jul 8, 22:00 UTCJul 8, 22:45 UTC45m
2026-07-08 HLE85 - Jul 8, 18:25 UTCJul 8, 18:35 UTC10m
2026-07-08 HLE85 - Jul 8, 15:05 UTCJul 8, 15:25 UTC20m
2026-07-08 HLE85 - Jul 8, 11:00 UTCJul 8, 11:20 UTC20m
2026-07-07 HLE85 - Jul 7, 21:55 UTCJul 7, 23:15 UTC1h 20m
2026-07-07 HLE85 - Jul 7, 18:40 UTCJul 7, 19:40 UTC1h 0m
2026-07-07 HLE85 - Jul 7, 17:00 UTCJul 7, 18:00 UTC1h 0m
2026-07-07 HLE85 - Jul 7, 15:55 UTCJul 7, 16:05 UTC10m
2026-07-07 HLE85 - Jul 7, 14:40 UTCJul 7, 15:00 UTC20m
2026-07-07 HLE85 - Jul 7, 12:35 UTCJul 7, 13:25 UTC50m
2026-07-06 HLE85 NWI → NWI Jul 6, 15:45 UTCJul 6, 16:05 UTC20m
2026-07-05 HLE85 - Jul 5, 15:45 UTCJul 5, 16:05 UTC20m
2026-07-05 HLE85 - Jul 5, 14:35 UTCJul 5, 14:55 UTC20m
2026-07-05 HLE85 - Jul 5, 12:30 UTCJul 5, 13:35 UTC1h 5m
2026-07-05 HLE85 - Jul 5, 11:30 UTCJul 5, 11:40 UTC10m
2026-07-05 HLE85 - Jul 5, 10:30 UTCJul 5, 10:45 UTC15m
2026-07-05 HLE85 - Jul 5, 09:15 UTCJul 5, 09:25 UTC10m
2026-07-04 HLE85 - Jul 4, 21:05 UTCJul 4, 21:15 UTC10m
2026-07-04 HLE85 - Jul 4, 20:05 UTCJul 4, 20:15 UTC10m
2026-07-04 HLE85 - Jul 4, 18:00 UTCJul 4, 18:10 UTC10m
2026-07-04 HLE85 - Jul 4, 16:10 UTCJul 4, 16:20 UTC10m
2026-07-04 HLE85 - Jul 4, 14:30 UTCJul 4, 15:05 UTC35m
2026-07-04 HLE85 - Jul 4, 12:45 UTCJul 4, 13:10 UTC25m
2026-07-03 HLE85 NWI → NWI Jul 3, 21:00 UTCJul 3, 21:55 UTC55m
2026-07-02 HLE85 - Jul 2, 20:40 UTCJul 2, 20:50 UTC10m
2026-07-02 HLE85 - Jul 2, 19:55 UTCJul 2, 20:35 UTC40m
2026-07-02 HLE85 - Jul 2, 17:30 UTCJul 2, 18:05 UTC35m
2026-07-02 HLE85 - Jul 2, 13:30 UTCJul 2, 13:45 UTC15m
2026-07-02 HLE85 - Jul 2, 12:05 UTCJul 2, 12:50 UTC45m
2026-07-01 HLE85 - Jul 1, 21:00 UTCJul 1, 21:55 UTC55m
2026-06-30 HLE85 - Jun 30, 21:40 UTCJun 30, 22:35 UTC55m
2026-06-30 HLE85 - Jun 30, 19:50 UTCJun 30, 20:10 UTC20m
2026-06-30 HLE85 CBG → NWI Jun 30, 13:55 UTCJun 30, 14:25 UTC30m
2026-06-30 HLE85 - Jun 30, 12:05 UTCJun 30, 12:15 UTC10m
2026-06-30 HLE85 - Jun 30, 11:10 UTCJun 30, 11:35 UTC25m
2026-06-30 HLE85 - Jun 30, 04:25 UTCJun 30, 04:35 UTC10m
2026-06-30 HLE85 - Jun 30, 03:10 UTCJun 30, 03:25 UTC15m
2026-06-30 HLE85 - Jun 30, 02:00 UTCJun 30, 02:10 UTC10m

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

Mode-S 406CA0 frequently asked

What is Mode-S code 406CA0?
406CA0 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-HEMC.
Where is Mode-S 406CA0 registered?
Mode-S code 406CA0 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 406CA0 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406CA0, octal 20066240, decimal 4,222,112.
What flights does 406CA0 operate?
Mode-S 406CA0 has broadcast 4 distinct callsigns, including HLE85, HLE88, RHD08, RHD72.