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sensors Mode-S transponder

4077C8

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
4077C8
Octal
20073710
Decimal
4,224,968
Country
GB
Tail
G-ISAS
Type
EC45
No current signal · last broadcast 1d ago
Flights observed
327
Distinct callsigns
2
Country
GB
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4077C8.

Country allocation

The ICAO 24-bit address 4077C8 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
HLE05 - 214 2026-05-25
HLE02 - 113 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 HLE02 - Jul 16, 13:45 UTCJul 16, 14:00 UTC15m
2026-07-16 HLE02 - Jul 16, 12:20 UTCJul 16, 12:44 UTC25m
2026-07-15 HLE02 - Jul 15, 11:10 UTCJul 15, 11:30 UTC20m
2026-07-15 HLE02 - Jul 15, 10:20 UTCJul 15, 10:40 UTC20m
2026-07-14 HLE02 - Jul 14, 20:55 UTCJul 14, 21:35 UTC40m
2026-07-14 HLE02 - Jul 14, 15:05 UTCJul 14, 15:40 UTC35m
2026-07-13 HLE02 - Jul 13, 23:45 UTCJul 14, 00:05 UTC20m
2026-07-13 HLE02 - Jul 13, 16:05 UTCJul 13, 16:30 UTC25m
2026-07-13 HLE02 - Jul 13, 12:15 UTCJul 13, 12:30 UTC15m
2026-07-13 HLE02 - Jul 13, 01:45 UTCJul 13, 02:30 UTC45m
2026-07-12 HLE02 - Jul 12, 22:25 UTCJul 12, 23:15 UTC50m
2026-07-12 HLE02 - Jul 12, 21:50 UTCJul 12, 22:00 UTC10m
2026-07-12 HLE02 - Jul 12, 19:15 UTCJul 12, 20:10 UTC55m
2026-07-12 HLE02 - Jul 12, 13:45 UTCJul 12, 13:55 UTC10m
2026-07-12 HLE02 - Jul 12, 12:40 UTCJul 12, 13:10 UTC30m
2026-07-11 HLE02 - Jul 11, 22:25 UTCJul 11, 23:15 UTC50m
2026-07-11 HLE02 - Jul 11, 21:10 UTCJul 11, 21:20 UTC10m
2026-07-11 HLE02 - Jul 11, 19:10 UTCJul 11, 20:10 UTC1h 0m
2026-07-11 HLE02 - Jul 11, 10:10 UTCJul 11, 10:20 UTC10m
2026-07-10 HLE02 - Jul 10, 18:10 UTCJul 10, 18:20 UTC10m
2026-07-10 HLE02 - Jul 10, 15:15 UTCJul 10, 15:35 UTC20m
2026-07-10 HLE02 - Jul 10, 12:45 UTCJul 10, 13:40 UTC55m
2026-07-10 HLE02 - Jul 10, 10:40 UTCJul 10, 11:15 UTC35m
2026-07-09 HLE02 - Jul 9, 15:55 UTCJul 9, 16:20 UTC25m
2026-07-09 HLE02 - Jul 9, 14:10 UTCJul 9, 14:20 UTC10m
2026-07-09 HLE02 - Jul 9, 12:15 UTCJul 9, 12:35 UTC20m
2026-07-08 HLE02 - Jul 8, 17:30 UTCJul 8, 18:20 UTC50m
2026-07-08 HLE02 - Jul 8, 16:05 UTCJul 8, 16:55 UTC50m
2026-07-07 HLE02 - Jul 7, 15:15 UTCJul 7, 15:45 UTC30m
2026-07-07 HLE02 - Jul 7, 13:15 UTCJul 7, 13:25 UTC10m
2026-07-06 HLE02 - Jul 6, 14:55 UTCJul 6, 15:40 UTC45m
2026-07-06 HLE02 - Jul 6, 11:45 UTCJul 6, 13:20 UTC1h 35m
2026-07-05 HLE02 - Jul 5, 21:15 UTCJul 5, 21:35 UTC20m
2026-07-05 HLE02 - Jul 5, 19:35 UTCJul 5, 20:05 UTC30m
2026-07-05 HLE02 - Jul 5, 10:25 UTCJul 5, 11:50 UTC1h 25m
2026-07-05 HLE02 - Jul 5, 08:40 UTCJul 5, 09:50 UTC1h 10m
2026-07-04 HLE02 - Jul 4, 22:00 UTCJul 4, 22:15 UTC15m
2026-07-04 HLE02 - Jul 4, 20:10 UTCJul 4, 20:50 UTC40m
2026-07-04 HLE02 - Jul 4, 04:35 UTCJul 4, 05:05 UTC30m
2026-07-03 HLE02 - Jul 3, 23:25 UTCJul 4, 00:30 UTC1h 5m
2026-07-03 HLE02 - Jul 3, 16:20 UTCJul 3, 16:35 UTC15m
2026-07-03 HLE02 - Jul 3, 12:55 UTCJul 3, 13:25 UTC30m
2026-07-03 HLE02 - Jul 3, 10:15 UTCJul 3, 10:55 UTC40m
2026-07-03 HLE02 - Jul 3, 08:50 UTCJul 3, 09:15 UTC25m
2026-07-03 HLE02 - Jul 3, 04:15 UTCJul 3, 04:45 UTC30m
2026-07-03 HLE02 - Jul 3, 03:05 UTCJul 3, 03:30 UTC25m
2026-07-03 HLE02 - Jul 3, 01:30 UTCJul 3, 02:10 UTC40m
2026-07-02 HLE02 - Jul 2, 16:35 UTCJul 2, 16:50 UTC15m
2026-07-02 HLE02 - Jul 2, 15:00 UTCJul 2, 15:20 UTC20m
2026-07-02 HLE02 - Jul 2, 13:30 UTCJul 2, 14:25 UTC55m

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

Mode-S 4077C8 frequently asked

What is Mode-S code 4077C8?
4077C8 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-ISAS.
Where is Mode-S 4077C8 registered?
Mode-S code 4077C8 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 4077C8 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 4077C8, octal 20073710, decimal 4,224,968.
What flights does 4077C8 operate?
Mode-S 4077C8 has broadcast 2 distinct callsigns, including HLE05, HLE02.