Apparatus

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sensors Mode-S transponder

4008A8

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
4008A8
Octal
20004250
Decimal
4,196,520
Country
GB
Tail
G-SCAA
Type
EC35
No current signal · last broadcast 24d ago
Flights observed
55
Distinct callsigns
1
Country
GB
Last broadcast
24d ago

Last known position

Most recent position reported by Mode-S 4008A8.

Country allocation

The ICAO 24-bit address 4008A8 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
HLE75 - 55 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HLE75 - Jul 26, 16:45 UTCJul 26, 16:55 UTC10m
2026-07-26 HLE75 - Jul 26, 13:05 UTCJul 26, 13:50 UTC45m
2026-07-26 HLE75 - Jul 26, 12:25 UTCJul 26, 12:35 UTC10m
2026-07-26 HLE75 - Jul 26, 11:05 UTCJul 26, 11:40 UTC35m
2026-07-23 HLE75 - Jul 23, 19:25 UTCJul 23, 19:40 UTC15m
2026-07-23 HLE75 - Jul 23, 17:25 UTCJul 23, 17:35 UTC10m
2026-07-23 HLE75 - Jul 23, 10:50 UTCJul 23, 11:00 UTC10m
2026-07-23 HLE75 - Jul 23, 09:55 UTCJul 23, 10:10 UTC15m
2026-07-22 HLE75 - Jul 22, 18:05 UTCJul 22, 18:15 UTC10m
2026-07-22 HLE75 - Jul 22, 17:10 UTCJul 22, 17:20 UTC10m
2026-07-22 HLE75 - Jul 22, 14:05 UTCJul 22, 14:20 UTC15m
2026-07-21 HLE75 - Jul 21, 16:20 UTCJul 21, 16:40 UTC20m
2026-07-21 HLE75 - Jul 21, 11:50 UTCJul 21, 12:00 UTC10m
2026-07-21 HLE75 - Jul 21, 10:30 UTCJul 21, 10:40 UTC10m
2026-07-21 HLE75 - Jul 21, 08:50 UTCJul 21, 09:25 UTC35m
2026-07-20 HLE75 - Jul 20, 14:10 UTCJul 20, 14:20 UTC10m
2026-07-20 HLE75 - Jul 20, 10:00 UTCJul 20, 10:15 UTC15m
2026-07-20 HLE75 - Jul 20, 09:10 UTCJul 20, 09:20 UTC10m
2026-07-19 HLE75 - Jul 19, 18:15 UTCJul 19, 18:25 UTC10m
2026-07-19 HLE75 - Jul 19, 16:20 UTCJul 19, 16:30 UTC10m
2026-07-19 HLE75 - Jul 19, 13:35 UTCJul 19, 13:50 UTC15m
2026-07-19 HLE75 - Jul 19, 10:35 UTCJul 19, 11:45 UTC1h 10m
2026-07-17 HLE75 - Jul 17, 16:00 UTCJul 17, 16:40 UTC40m
2026-07-17 HLE75 - Jul 17, 13:15 UTCJul 17, 13:25 UTC10m
2026-07-17 HLE75 - Jul 17, 11:39 UTCJul 17, 11:50 UTC10m
2026-07-17 HLE75 - Jul 17, 09:50 UTCJul 17, 10:00 UTC10m
2026-07-14 HLE75 - Jul 14, 15:00 UTCJul 14, 15:55 UTC55m
2026-07-14 HLE75 - Jul 14, 14:05 UTCJul 14, 14:15 UTC10m
2026-07-14 HLE75 - Jul 14, 13:15 UTCJul 14, 13:25 UTC10m
2026-07-13 HLE75 - Jul 13, 17:30 UTCJul 13, 19:00 UTC1h 30m
2026-07-13 HLE75 - Jul 13, 14:30 UTCJul 13, 15:25 UTC55m
2026-07-13 HLE75 - Jul 13, 12:20 UTCJul 13, 13:05 UTC45m
2026-07-13 HLE75 - Jul 13, 11:15 UTCJul 13, 11:45 UTC30m
2026-07-12 HLE75 - Jul 12, 17:50 UTCJul 12, 18:05 UTC15m
2026-07-11 HLE75 - Jul 11, 18:05 UTCJul 11, 18:15 UTC10m
2026-07-11 HLE75 - Jul 11, 10:00 UTCJul 11, 10:30 UTC30m
2026-07-11 HLE75 - Jul 11, 07:55 UTCJul 11, 08:05 UTC10m
2026-07-10 HLE75 - Jul 10, 17:00 UTCJul 10, 17:10 UTC10m
2026-07-10 HLE75 - Jul 10, 15:35 UTCJul 10, 15:45 UTC10m
2026-07-10 HLE75 - Jul 10, 12:15 UTCJul 10, 12:25 UTC10m
2026-07-10 HLE75 - Jul 10, 11:15 UTCJul 10, 11:25 UTC10m
2026-07-10 HLE75 - Jul 10, 09:55 UTCJul 10, 10:05 UTC10m
2026-07-09 HLE75 - Jul 9, 07:30 UTCJul 9, 07:40 UTC10m
2026-07-08 HLE75 - Jul 8, 15:00 UTCJul 8, 15:15 UTC15m
2026-07-08 HLE75 - Jul 8, 14:10 UTCJul 8, 14:20 UTC10m
2026-07-08 HLE75 - Jul 8, 08:10 UTCJul 8, 08:20 UTC10m
2026-07-07 HLE75 - Jul 7, 17:15 UTCJul 7, 17:45 UTC30m
2026-07-06 HLE75 - Jul 6, 16:50 UTCJul 6, 17:10 UTC20m
2026-07-06 HLE75 - Jul 6, 10:55 UTCJul 6, 11:10 UTC15m
2026-07-06 HLE75 - Jul 6, 10:10 UTCJul 6, 10:15 UTC5m

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

Mode-S 4008A8 frequently asked

What is Mode-S code 4008A8?
4008A8 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-SCAA.
Where is Mode-S 4008A8 registered?
Mode-S code 4008A8 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 4008A8 broadcasting right now?
No active broadcast right now. Last signal was 24d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4008A8, octal 20004250, decimal 4,196,520.
What flights does 4008A8 operate?
Mode-S 4008A8 has broadcast 1 distinct callsign, including HLE75.