Apparatus

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sensors Mode-S transponder

407FDD

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
407FDD
Octal
20077735
Decimal
4,227,037
Country
GB
Tail
G-LAAB
Type
EC35
No current signal · last broadcast 3h ago
Flights observed
295
Distinct callsigns
2
Country
GB
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 407FDD.

Country allocation

The ICAO 24-bit address 407FDD 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
HLE27 - 292 2026-07-14
HLE28 - 3 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 HLE27 - Jul 14, 10:40 UTCJul 14, 11:15 UTC35m
2026-07-14 HLE27 - Jul 14, 09:05 UTCJul 14, 09:10 UTC5m
2026-07-14 HLE27 - Jul 14, 06:55 UTCJul 14, 07:05 UTC10m
2026-07-14 HLE27 - Jul 14, 06:40 UTCJul 14, 06:50 UTC10m
2026-07-13 HLE27 - Jul 13, 20:20 UTCJul 13, 20:30 UTC10m
2026-07-13 HLE27 - Jul 13, 19:00 UTCJul 13, 19:05 UTC5m
2026-07-13 HLE27 - Jul 13, 14:00 UTCJul 13, 14:05 UTC5m
2026-07-13 HLE27 - Jul 13, 10:05 UTCJul 13, 10:15 UTC10m
2026-07-13 HLE27 - Jul 13, 09:10 UTCJul 13, 09:15 UTC5m
2026-07-13 HLE27 - Jul 13, 06:50 UTCJul 13, 07:01 UTC10m
2026-07-12 HLE27 - Jul 12, 19:50 UTCJul 12, 20:35 UTC45m
2026-07-12 HLE27 - Jul 12, 15:10 UTCJul 12, 15:50 UTC40m
2026-07-12 HLE27 - Jul 12, 13:30 UTCJul 12, 13:40 UTC10m
2026-07-12 HLE27 - Jul 12, 12:20 UTCJul 12, 12:25 UTC5m
2026-07-12 HLE27 - Jul 12, 10:55 UTCJul 12, 11:15 UTC20m
2026-07-12 HLE27 - Jul 12, 09:15 UTCJul 12, 09:35 UTC20m
2026-07-12 HLE27 - Jul 12, 07:10 UTCJul 12, 07:50 UTC40m
2026-07-12 HLE27 - Jul 12, 06:55 UTCJul 12, 07:05 UTC10m
2026-07-11 HLE27 - Jul 11, 20:05 UTCJul 11, 20:15 UTC10m
2026-07-11 HLE27 - Jul 11, 16:30 UTCJul 11, 17:45 UTC1h 15m
2026-07-11 HLE27 - Jul 11, 15:40 UTCJul 11, 16:15 UTC35m
2026-07-11 HLE27 - Jul 11, 12:10 UTCJul 11, 12:55 UTC45m
2026-07-11 HLE27 - Jul 11, 10:45 UTCJul 11, 10:50 UTC5m
2026-07-11 HLE27 - Jul 11, 06:45 UTCJul 11, 06:55 UTC10m
2026-07-10 HLE27 - Jul 10, 20:30 UTCJul 10, 20:40 UTC10m
2026-07-10 HLE27 - Jul 10, 17:10 UTCJul 10, 17:20 UTC10m
2026-07-10 HLE27 - Jul 10, 16:55 UTCJul 10, 17:00 UTC5m
2026-07-10 HLE27 - Jul 10, 13:45 UTCJul 10, 14:10 UTC25m
2026-07-10 HLE27 - Jul 10, 13:20 UTCJul 10, 13:25 UTC5m
2026-07-10 HLE27 - Jul 10, 09:25 UTCJul 10, 10:25 UTC1h 0m
2026-07-10 HLE27 - Jul 10, 06:55 UTCJul 10, 07:00 UTC5m
2026-07-09 HLE27 - Jul 9, 20:30 UTCJul 9, 20:40 UTC10m
2026-07-09 HLE27 - Jul 9, 15:50 UTCJul 9, 15:55 UTC5m
2026-07-09 HLE27 - Jul 9, 12:55 UTCJul 9, 13:35 UTC40m
2026-07-09 HLE27 - Jul 9, 07:00 UTCJul 9, 07:10 UTC10m
2026-07-08 HLE27 - Jul 8, 20:45 UTCJul 8, 20:55 UTC10m
2026-07-08 HLE27 - Jul 8, 20:05 UTCJul 8, 20:40 UTC35m
2026-07-08 HLE27 - Jul 8, 18:05 UTCJul 8, 18:35 UTC30m
2026-07-08 HLE27 - Jul 8, 16:10 UTCJul 8, 16:55 UTC45m
2026-07-08 HLE27 - Jul 8, 14:50 UTCJul 8, 15:05 UTC15m
2026-07-08 HLE27 - Jul 8, 13:00 UTCJul 8, 13:05 UTC5m
2026-07-08 HLE27 - Jul 8, 11:05 UTCJul 8, 11:35 UTC30m
2026-07-08 HLE27 - Jul 8, 08:55 UTCJul 8, 09:05 UTC10m
2026-07-08 HLE27 - Jul 8, 07:55 UTCJul 8, 08:00 UTC5m
2026-07-08 HLE27 - Jul 8, 06:45 UTCJul 8, 06:55 UTC10m
2026-07-07 HLE27 - Jul 7, 20:35 UTCJul 7, 20:45 UTC10m
2026-07-07 HLE27 - Jul 7, 16:05 UTCJul 7, 16:20 UTC15m
2026-07-07 HLE27 - Jul 7, 14:35 UTCJul 7, 14:40 UTC5m
2026-07-07 HLE27 - Jul 7, 13:50 UTCJul 7, 14:00 UTC10m
2026-07-07 HLE27 - Jul 7, 11:35 UTCJul 7, 11:40 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-LAAB page for operator, model, and routing details .

Mode-S 407FDD frequently asked

What is Mode-S code 407FDD?
407FDD is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-LAAB.
Where is Mode-S 407FDD registered?
Mode-S code 407FDD 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 407FDD broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407FDD, octal 20077735, decimal 4,227,037.
What flights does 407FDD operate?
Mode-S 407FDD has broadcast 2 distinct callsigns, including HLE27, HLE28.