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sensors Mode-S transponder

406EC5

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
406EC5
Octal
20067305
Decimal
4,222,661
Country
GB
Tail
G-HIOW
Type
EC35
Broadcasting now · callsign HLE56 · 1,375 ft
Flights observed
191
Distinct callsigns
1
Country
GB
Last broadcast
4h ago

Current position

406EC5 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 406EC5 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
HLE56 - 190 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 HLE56 - Jul 18, 18:10 UTCJul 18, 18:20 UTC10m
2026-07-17 HLE56 - Jul 17, 11:15 UTCJul 17, 11:25 UTC10m
2026-07-17 HLE56 - Jul 17, 09:25 UTCJul 17, 09:35 UTC10m
2026-07-15 HLE56 - Jul 15, 19:35 UTCJul 15, 19:50 UTC15m
2026-07-15 HLE56 - Jul 15, 16:15 UTCJul 15, 16:30 UTC15m
2026-07-15 HLE56 - Jul 15, 14:40 UTCJul 15, 14:55 UTC15m
2026-07-14 HLE56 - Jul 14, 20:40 UTCJul 14, 21:20 UTC40m
2026-07-14 HLE56 - Jul 14, 18:00 UTCJul 14, 18:30 UTC30m
2026-07-14 HLE56 - Jul 14, 13:25 UTCJul 14, 13:35 UTC10m
2026-07-13 HLE56 - Jul 13, 23:55 UTCJul 14, 00:05 UTC10m
2026-07-13 HLE56 - Jul 13, 21:50 UTCJul 13, 22:40 UTC50m
2026-07-13 HLE56 - Jul 13, 16:05 UTCJul 13, 16:30 UTC25m
2026-07-12 HLE56 SOU → SOU Jul 12, 22:20 UTCJul 12, 22:50 UTC30m
2026-07-11 HLE56 - Jul 11, 19:15 UTCJul 11, 19:25 UTC10m
2026-07-11 HLE56 - Jul 11, 18:30 UTCJul 11, 18:40 UTC10m
2026-07-11 HLE56 - Jul 11, 13:45 UTCJul 11, 13:55 UTC10m
2026-07-11 HLE56 - Jul 11, 12:30 UTCJul 11, 12:40 UTC10m
2026-07-11 HLE56 SOU → SOU Jul 11, 06:50 UTCJul 11, 07:10 UTC20m
2026-07-10 HLE56 - Jul 10, 15:25 UTCJul 10, 15:45 UTC20m
2026-07-09 HLE56 - Jul 9, 23:25 UTCJul 9, 23:45 UTC20m
2026-07-09 HLE56 - Jul 9, 22:40 UTCJul 9, 22:50 UTC10m
2026-07-09 HLE56 - Jul 9, 16:05 UTCJul 9, 16:15 UTC10m
2026-07-07 HLE56 - Jul 7, 21:55 UTCJul 7, 22:05 UTC10m
2026-07-07 HLE56 - Jul 7, 21:10 UTCJul 7, 21:20 UTC10m
2026-07-07 HLE56 - Jul 7, 19:20 UTCJul 7, 19:35 UTC15m
2026-07-07 HLE56 - Jul 7, 15:30 UTCJul 7, 16:00 UTC30m
2026-07-06 HLE56 - Jul 6, 20:10 UTCJul 6, 20:20 UTC10m
2026-07-06 HLE56 - Jul 6, 12:10 UTCJul 6, 12:20 UTC10m
2026-07-05 HLE56 - Jul 5, 18:00 UTCJul 5, 18:10 UTC10m
2026-07-04 HLE56 - Jul 4, 12:20 UTCJul 4, 12:30 UTC10m
2026-07-04 HLE56 - Jul 4, 11:10 UTCJul 4, 11:20 UTC10m
2026-07-04 HLE56 - Jul 4, 09:45 UTCJul 4, 09:55 UTC10m
2026-07-04 HLE56 - Jul 4, 07:55 UTCJul 4, 08:10 UTC15m
2026-07-03 HLE56 - Jul 3, 21:45 UTCJul 3, 21:55 UTC10m
2026-07-03 HLE56 - Jul 3, 19:55 UTCJul 3, 20:05 UTC10m
2026-07-03 HLE56 SOU → SOU Jul 3, 13:40 UTCJul 3, 14:25 UTC45m
2026-07-03 HLE56 - Jul 3, 09:05 UTCJul 3, 09:15 UTC10m
2026-07-01 HLE56 - Jul 1, 18:30 UTCJul 1, 18:40 UTC10m
2026-07-01 HLE56 - Jul 1, 17:05 UTCJul 1, 17:10 UTC5m
2026-06-30 HLE56 - Jun 30, 21:30 UTCJun 30, 21:50 UTC20m
2026-06-30 HLE56 - Jun 30, 16:50 UTCJun 30, 16:55 UTC5m
2026-06-30 HLE56 - Jun 30, 09:10 UTCJun 30, 09:35 UTC25m
2026-06-30 HLE56 - Jun 30, 07:50 UTCJun 30, 08:05 UTC15m
2026-06-30 HLE56 - Jun 30, 06:35 UTCJun 30, 06:50 UTC15m
2026-06-29 HLE56 - Jun 29, 17:45 UTCJun 29, 17:55 UTC10m
2026-06-27 HLE56 - Jun 27, 16:59 UTCJun 27, 17:25 UTC25m
2026-06-27 HLE56 - Jun 27, 14:45 UTCJun 27, 14:54 UTC10m
2026-06-27 HLE56 SOU → SOU Jun 27, 12:19 UTCJun 27, 13:00 UTC40m
2026-06-27 HLE56 - Jun 27, 08:25 UTCJun 27, 08:35 UTC10m
2026-06-27 HLE56 - Jun 27, 00:10 UTCJun 27, 00:25 UTC15m

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

Mode-S 406EC5 frequently asked

What is Mode-S code 406EC5?
406EC5 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-HIOW.
Where is Mode-S 406EC5 registered?
Mode-S code 406EC5 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 406EC5 broadcasting right now?
Yes. Mode-S 406EC5 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406EC5, octal 20067305, decimal 4,222,661.
What flights does 406EC5 operate?
Mode-S 406EC5 has broadcast 1 distinct callsign, including HLE56.