Apparatus

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sensors Mode-S transponder

408257

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
408257
Octal
20101127
Decimal
4,227,671
Country
GB
Tail
G-NSCA
Type
EC45
No current signal · last broadcast 1d ago
Flights observed
121
Distinct callsigns
1
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 408257.

Country allocation

The ICAO 24-bit address 408257 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
HLE79 - 121 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 HLE79 - Jul 22, 17:10 UTCJul 22, 18:05 UTC55m
2026-07-22 HLE79 - Jul 22, 14:00 UTCJul 22, 14:50 UTC50m
2026-07-21 HLE79 - Jul 21, 14:00 UTCJul 21, 14:30 UTC30m
2026-07-21 HLE79 - Jul 21, 11:10 UTCJul 21, 11:40 UTC30m
2026-07-20 HLE79 - Jul 20, 17:20 UTCJul 20, 17:30 UTC10m
2026-07-20 HLE79 - Jul 20, 15:35 UTCJul 20, 15:50 UTC15m
2026-07-19 HLE79 - Jul 19, 15:55 UTCJul 19, 16:40 UTC45m
2026-07-19 HLE79 - Jul 19, 13:25 UTCJul 19, 14:25 UTC1h 0m
2026-07-18 HLE79 - Jul 18, 14:15 UTCJul 18, 14:25 UTC10m
2026-07-17 HLE79 - Jul 17, 13:55 UTCJul 17, 14:44 UTC50m
2026-07-17 HLE79 - Jul 17, 12:40 UTCJul 17, 12:55 UTC15m
2026-07-16 HLE79 - Jul 16, 16:35 UTCJul 16, 17:00 UTC25m
2026-07-16 HLE79 - Jul 16, 12:49 UTCJul 16, 12:55 UTC5m
2026-07-16 HLE79 - Jul 16, 12:00 UTCJul 16, 12:09 UTC10m
2026-07-16 HLE79 - Jul 16, 10:45 UTCJul 16, 10:59 UTC15m
2026-07-15 HLE79 - Jul 15, 10:20 UTCJul 15, 10:30 UTC10m
2026-07-14 HLE79 - Jul 14, 14:35 UTCJul 14, 15:25 UTC50m
2026-07-14 HLE79 - Jul 14, 13:05 UTCJul 14, 13:55 UTC50m
2026-07-13 HLE79 - Jul 13, 16:50 UTCJul 13, 17:05 UTC15m
2026-07-13 HLE79 - Jul 13, 15:10 UTCJul 13, 15:30 UTC20m
2026-07-12 HLE79 - Jul 12, 10:55 UTCJul 12, 11:55 UTC1h 0m
2026-07-12 HLE79 - Jul 12, 08:50 UTCJul 12, 09:50 UTC1h 0m
2026-07-11 HLE79 - Jul 11, 16:50 UTCJul 11, 17:15 UTC25m
2026-07-07 HLE79 - Jul 7, 16:30 UTCJul 7, 17:25 UTC55m
2026-07-07 HLE79 - Jul 7, 14:05 UTCJul 7, 15:10 UTC1h 5m
2026-07-06 HLE79 - Jul 6, 16:45 UTCJul 6, 17:15 UTC30m
2026-07-06 HLE79 - Jul 6, 11:50 UTCJul 6, 12:00 UTC10m
2026-07-03 HLE79 - Jul 3, 13:20 UTCJul 3, 13:35 UTC15m
2026-07-03 HLE79 - Jul 3, 12:15 UTCJul 3, 12:40 UTC25m
2026-07-03 HLE79 - Jul 3, 10:40 UTCJul 3, 11:30 UTC50m
2026-07-01 HLE79 - Jul 1, 10:35 UTCJul 1, 10:45 UTC10m
2026-07-01 HLE79 - Jul 1, 09:40 UTCJul 1, 09:50 UTC10m
2026-07-01 HLE79 - Jul 1, 08:05 UTCJul 1, 08:20 UTC15m
2026-06-30 HLE79 - Jun 30, 12:05 UTCJun 30, 12:40 UTC35m
2026-06-30 HLE79 - Jun 30, 10:50 UTCJun 30, 11:15 UTC25m
2026-06-30 HLE79 - Jun 30, 09:15 UTCJun 30, 09:55 UTC40m
2026-06-29 HLE79 - Jun 29, 10:15 UTCJun 29, 10:29 UTC15m
2026-06-29 HLE79 - Jun 29, 09:10 UTCJun 29, 09:20 UTC10m
2026-06-29 HLE79 - Jun 29, 08:14 UTCJun 29, 08:24 UTC10m
2026-06-29 HLE79 - Jun 29, 06:54 UTCJun 29, 07:09 UTC15m
2026-06-26 HLE79 - Jun 26, 17:15 UTCJun 26, 17:44 UTC30m
2026-06-23 HLE79 - Jun 23, 17:50 UTCJun 23, 17:54 UTC5m
2026-06-21 HLE79 - Jun 21, 13:24 UTCJun 21, 13:34 UTC10m
2026-06-20 HLE79 - Jun 20, 11:20 UTCJun 20, 11:44 UTC25m
2026-06-20 HLE79 - Jun 20, 09:19 UTCJun 20, 09:44 UTC25m
2026-06-18 HLE79 - Jun 18, 17:50 UTCJun 18, 18:15 UTC25m
2026-06-18 HLE79 - Jun 18, 14:15 UTCJun 18, 15:10 UTC55m
2026-06-17 HLE79 - Jun 17, 14:50 UTCJun 17, 15:50 UTC1h 0m
2026-06-15 HLE79 - Jun 15, 18:20 UTCJun 15, 19:50 UTC1h 30m
2026-06-15 HLE79 - Jun 15, 17:10 UTCJun 15, 17:30 UTC20m

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

Mode-S 408257 frequently asked

What is Mode-S code 408257?
408257 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-NSCA.
Where is Mode-S 408257 registered?
Mode-S code 408257 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 408257 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 408257, octal 20101127, decimal 4,227,671.
What flights does 408257 operate?
Mode-S 408257 has broadcast 1 distinct callsign, including HLE79.