Apparatus

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sensors Mode-S transponder

4009FD

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-SPHU · AIRBUS HELICOPTERS EC-135/635

Hex
4009FD
Octal
20004775
Decimal
4,196,861
Country
GB
Tail
G-SPHU
Type
EC35
No current signal · last broadcast 26d ago
Flights observed
102
Distinct callsigns
1
Country
GB
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S 4009FD.

Country allocation

The ICAO 24-bit address 4009FD 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 1 distinct

Callsign Airline Flights Last seen
HLE06 - 101 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HLE06 - Jul 26, 13:25 UTCJul 26, 13:35 UTC10m
2026-07-25 HLE06 - Jul 25, 18:25 UTCJul 25, 18:50 UTC25m
2026-07-25 HLE06 - Jul 25, 12:50 UTCJul 25, 13:00 UTC10m
2026-07-21 HLE06 - Jul 21, 18:30 UTCJul 21, 18:40 UTC10m
2026-07-21 HLE06 - Jul 21, 17:05 UTCJul 21, 17:15 UTC10m
2026-07-21 HLE06 - Jul 21, 12:10 UTCJul 21, 12:20 UTC10m
2026-07-20 HLE06 - Jul 20, 16:40 UTCJul 20, 16:50 UTC10m
2026-07-20 HLE06 - Jul 20, 15:50 UTCJul 20, 16:10 UTC20m
2026-07-20 HLE06 - Jul 20, 13:15 UTCJul 20, 14:10 UTC55m
2026-07-19 HLE06 - Jul 19, 12:15 UTCJul 19, 12:25 UTC10m
2026-07-19 HLE06 - Jul 19, 11:15 UTCJul 19, 11:30 UTC15m
2026-07-19 HLE06 - Jul 19, 09:50 UTCJul 19, 10:25 UTC35m
2026-07-18 HLE06 - Jul 18, 19:25 UTCJul 18, 19:45 UTC20m
2026-07-18 HLE06 - Jul 18, 12:20 UTCJul 18, 12:30 UTC10m
2026-07-18 HLE06 - Jul 18, 11:20 UTCJul 18, 11:30 UTC10m
2026-07-17 HLE06 - Jul 17, 17:44 UTCJul 17, 18:05 UTC20m
2026-07-17 HLE06 - Jul 17, 16:40 UTCJul 17, 16:49 UTC10m
2026-07-17 HLE06 - Jul 17, 14:04 UTCJul 17, 14:15 UTC10m
2026-07-17 HLE06 - Jul 17, 08:04 UTCJul 17, 08:15 UTC10m
2026-07-16 - - Jul 16, 14:10 UTCJul 16, 14:20 UTC10m
2026-07-16 HLE06 - Jul 16, 10:15 UTCJul 16, 10:35 UTC20m
2026-07-14 HLE06 - Jul 14, 15:30 UTCJul 14, 15:40 UTC10m
2026-07-14 HLE06 - Jul 14, 14:15 UTCJul 14, 14:20 UTC5m
2026-07-14 HLE06 - Jul 14, 11:50 UTCJul 14, 12:00 UTC10m
2026-07-13 HLE06 - Jul 13, 12:45 UTCJul 13, 12:55 UTC10m
2026-07-13 HLE06 - Jul 13, 11:45 UTCJul 13, 12:00 UTC15m
2026-07-12 HLE06 - Jul 12, 10:50 UTCJul 12, 11:10 UTC20m
2026-07-11 HLE06 - Jul 11, 15:25 UTCJul 11, 15:35 UTC10m
2026-07-11 HLE06 - Jul 11, 14:00 UTCJul 11, 14:35 UTC35m
2026-07-09 HLE06 - Jul 9, 16:25 UTCJul 9, 16:40 UTC15m
2026-07-09 HLE06 - Jul 9, 11:35 UTCJul 9, 12:10 UTC35m
2026-07-09 HLE06 - Jul 9, 10:55 UTCJul 9, 11:05 UTC10m
2026-07-09 HLE06 - Jul 9, 08:50 UTCJul 9, 09:35 UTC45m
2026-07-08 HLE06 - Jul 8, 14:55 UTCJul 8, 15:05 UTC10m
2026-07-08 HLE06 - Jul 8, 12:00 UTCJul 8, 12:10 UTC10m
2026-07-08 HLE06 - Jul 8, 11:10 UTCJul 8, 11:35 UTC25m
2026-07-06 HLE06 - Jul 6, 11:00 UTCJul 6, 13:15 UTC2h 15m
2026-07-06 HLE06 - Jul 6, 09:40 UTCJul 6, 09:55 UTC15m
2026-07-05 HLE06 - Jul 5, 17:45 UTCJul 5, 18:00 UTC15m
2026-07-05 HLE06 - Jul 5, 16:10 UTCJul 5, 16:20 UTC10m
2026-07-05 HLE06 - Jul 5, 13:45 UTCJul 5, 14:20 UTC35m
2026-07-04 HLE06 - Jul 4, 14:15 UTCJul 4, 14:50 UTC35m
2026-07-04 HLE06 - Jul 4, 11:50 UTCJul 4, 12:30 UTC40m
2026-07-04 HLE06 - Jul 4, 10:35 UTCJul 4, 10:45 UTC10m
2026-07-02 HLE06 - Jul 2, 14:30 UTCJul 2, 15:10 UTC40m
2026-07-01 HLE06 - Jul 1, 16:20 UTCJul 1, 16:30 UTC10m
2026-07-01 HLE06 - Jul 1, 14:30 UTCJul 1, 14:40 UTC10m
2026-06-30 HLE06 - Jun 30, 12:30 UTCJun 30, 12:40 UTC10m
2026-06-29 HLE06 - Jun 29, 10:34 UTCJun 29, 10:55 UTC20m
2026-06-28 HLE06 - Jun 28, 17:00 UTCJun 28, 17:30 UTC30m

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

Mode-S 4009FD frequently asked

What is Mode-S code 4009FD?
4009FD is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-SPHU.
Where is Mode-S 4009FD registered?
Mode-S code 4009FD 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 4009FD broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4009FD, octal 20004775, decimal 4,196,861.
What flights does 4009FD operate?
Mode-S 4009FD has broadcast 1 distinct callsign, including HLE06.