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sensors Mode-S transponder

40709D

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-LNAC · AGUSTA AW-169

Hex
40709D
Octal
20070235
Decimal
4,223,133
Country
GB
Tail
G-LNAC
Type
A169
Broadcasting now · callsign HLE60 · 375 ft
Flights observed
476
Distinct callsigns
2
Country
GB
Last broadcast
Jul 26, 15:35 UTC

Current position

40709D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40709D 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
HLE60 - 348 2026-07-26
HLE21 - 128 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 HLE60 - Jul 26, 15:10 UTCJul 26, 15:30 UTC20m
2026-07-26 HLE60 - Jul 26, 13:55 UTCJul 26, 14:15 UTC20m
2026-07-26 HLE60 - Jul 26, 12:35 UTCJul 26, 13:20 UTC45m
2026-07-26 HLE60 - Jul 26, 09:40 UTCJul 26, 11:15 UTC1h 35m
2026-07-26 HLE60 - Jul 26, 05:30 UTCJul 26, 05:40 UTC10m
2026-07-26 HLE60 - Jul 26, 04:50 UTCJul 26, 05:05 UTC15m
2026-07-26 HLE60 - Jul 26, 03:10 UTCJul 26, 03:25 UTC15m
2026-07-26 HLE60 - Jul 26, 02:30 UTCJul 26, 02:50 UTC20m
2026-07-25 HLE60 - Jul 25, 22:40 UTCJul 25, 23:00 UTC20m
2026-07-25 HLE60 - Jul 25, 21:30 UTCJul 25, 21:45 UTC15m
2026-07-25 HLE21 - Jul 25, 17:50 UTCJul 25, 18:10 UTC20m
2026-07-25 HLE21 - Jul 25, 17:10 UTCJul 25, 17:25 UTC15m
2026-07-25 HLE21 - Jul 25, 15:45 UTCJul 25, 17:05 UTC1h 20m
2026-07-24 HLE21 - Jul 24, 18:20 UTCJul 24, 18:40 UTC20m
2026-07-24 HLE21 - Jul 24, 17:30 UTCJul 24, 17:50 UTC20m
2026-07-24 HLE21 - Jul 24, 15:40 UTCJul 24, 15:50 UTC10m
2026-07-24 HLE21 - Jul 24, 14:45 UTCJul 24, 14:55 UTC10m
2026-07-24 HLE60 - Jul 24, 04:45 UTCJul 24, 05:20 UTC35m
2026-07-24 HLE60 - Jul 24, 00:55 UTCJul 24, 01:25 UTC30m
2026-07-23 HLE60 - Jul 23, 23:20 UTCJul 23, 23:30 UTC10m
2026-07-23 HLE60 - Jul 23, 21:45 UTCJul 23, 22:00 UTC15m
2026-07-23 HLE60 - Jul 23, 17:30 UTCJul 23, 17:40 UTC10m
2026-07-23 HLE60 - Jul 23, 16:00 UTCJul 23, 16:55 UTC55m
2026-07-23 HLE60 - Jul 23, 15:15 UTCJul 23, 15:30 UTC15m
2026-07-23 HLE60 - Jul 23, 12:35 UTCJul 23, 12:45 UTC10m
2026-07-22 HLE60 - Jul 22, 18:20 UTCJul 22, 18:30 UTC10m
2026-07-22 HLE60 - Jul 22, 17:35 UTCJul 22, 17:55 UTC20m
2026-07-22 HLE60 - Jul 22, 16:25 UTCJul 22, 16:50 UTC25m
2026-07-22 HLE60 - Jul 22, 12:45 UTCJul 22, 12:55 UTC10m
2026-07-22 HLE60 - Jul 22, 11:50 UTCJul 22, 12:00 UTC10m
2026-07-22 HLE60 - Jul 22, 03:35 UTCJul 22, 03:50 UTC15m
2026-07-22 HLE60 - Jul 22, 02:25 UTCJul 22, 02:40 UTC15m
2026-07-21 HLE60 - Jul 21, 20:25 UTCJul 21, 20:45 UTC20m
2026-07-21 HLE60 - Jul 21, 19:30 UTCJul 21, 19:45 UTC15m
2026-07-21 HLE60 - Jul 21, 18:30 UTCJul 21, 19:15 UTC45m
2026-07-21 HLE60 - Jul 21, 16:35 UTCJul 21, 16:50 UTC15m
2026-07-21 HLE60 - Jul 21, 12:00 UTCJul 21, 12:15 UTC15m
2026-07-21 HLE60 - Jul 21, 11:00 UTCJul 21, 11:20 UTC20m
2026-07-21 HLE60 - Jul 21, 09:25 UTCJul 21, 09:40 UTC15m
2026-07-21 HLE60 - Jul 21, 05:00 UTCJul 21, 05:15 UTC15m
2026-07-21 HLE60 - Jul 21, 04:00 UTCJul 21, 04:25 UTC25m
2026-07-20 HLE60 - Jul 20, 21:05 UTCJul 20, 21:20 UTC15m
2026-07-20 HLE60 - Jul 20, 19:00 UTCJul 20, 20:00 UTC1h 0m
2026-07-20 HLE60 - Jul 20, 13:30 UTCJul 20, 13:40 UTC10m
2026-07-20 HLE60 - Jul 20, 12:30 UTCJul 20, 12:55 UTC25m
2026-07-20 HLE60 - Jul 20, 10:55 UTCJul 20, 11:20 UTC25m
2026-07-20 HLE60 - Jul 20, 10:25 UTCJul 20, 10:40 UTC15m
2026-07-20 HLE60 - Jul 20, 08:10 UTCJul 20, 08:25 UTC15m
2026-07-19 HLE21 - Jul 19, 17:25 UTCJul 19, 17:35 UTC10m
2026-07-19 HLE21 - Jul 19, 16:35 UTCJul 19, 16:40 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-LNAC page for operator, model, and routing details .

Mode-S 40709D frequently asked

What is Mode-S code 40709D?
40709D is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-LNAC.
Where is Mode-S 40709D registered?
Mode-S code 40709D 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 40709D broadcasting right now?
Yes. Mode-S 40709D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40709D, octal 20070235, decimal 4,223,133.
What flights does 40709D operate?
Mode-S 40709D has broadcast 2 distinct callsigns, including HLE60, HLE21.