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sensors Mode-S transponder

406F2B

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
406F2B
Octal
20067453
Decimal
4,222,763
Country
GB
Tail
G-RESU
Type
EC45
Broadcasting now · callsign HLE85 · 1,175 ft
Flights observed
173
Distinct callsigns
5
Country
GB
Last broadcast
8h ago

Current position

406F2B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 406F2B 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 5 distinct

Callsign Airline Flights Last seen
HLE85 - 158 2026-06-16
HLE88 - 10 2026-05-07
RHD08 - 2 2026-05-02
RHD04 - 2 2026-04-29
RHD60 - 1 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 HLE85 - Jun 16, 09:40 UTCJun 16, 10:30 UTC50m
2026-06-15 HLE85 - Jun 15, 23:45 UTCJun 15, 23:54 UTC10m
2026-06-15 HLE85 - Jun 15, 22:49 UTCJun 15, 23:09 UTC20m
2026-06-15 HLE85 - Jun 15, 21:04 UTCJun 15, 22:15 UTC1h 10m
2026-06-15 HLE85 NWI → NWI Jun 15, 19:10 UTCJun 15, 20:00 UTC50m
2026-06-15 HLE85 - Jun 15, 17:04 UTCJun 15, 17:45 UTC40m
2026-06-15 HLE85 - Jun 15, 10:55 UTCJun 15, 11:10 UTC15m
2026-06-15 HLE85 - Jun 15, 03:15 UTCJun 15, 03:30 UTC15m
2026-06-13 HLE85 - Jun 13, 14:00 UTCJun 13, 14:10 UTC10m
2026-06-13 HLE85 - Jun 13, 13:00 UTCJun 13, 13:15 UTC15m
2026-06-13 HLE85 - Jun 13, 12:10 UTCJun 13, 12:20 UTC10m
2026-06-11 HLE85 NWI → NWI Jun 11, 10:50 UTCJun 11, 11:10 UTC20m
2026-06-10 HLE85 - Jun 10, 12:15 UTCJun 10, 13:35 UTC1h 20m
2026-06-10 HLE85 - Jun 10, 10:00 UTCJun 10, 10:20 UTC20m
2026-06-10 HLE85 - Jun 10, 08:35 UTCJun 10, 08:50 UTC15m
2026-06-10 HLE85 - Jun 10, 06:30 UTCJun 10, 06:45 UTC15m
2026-06-10 HLE85 - Jun 10, 04:55 UTCJun 10, 05:15 UTC20m
2026-06-10 HLE85 - Jun 10, 01:45 UTCJun 10, 02:00 UTC15m
2026-06-09 HLE85 - Jun 9, 23:40 UTCJun 9, 23:50 UTC10m
2026-06-09 HLE85 NWI → NWI Jun 9, 16:45 UTCJun 9, 17:40 UTC55m
2026-06-09 HLE85 - Jun 9, 15:25 UTCJun 9, 15:45 UTC20m
2026-06-09 HLE85 - Jun 9, 14:00 UTCJun 9, 14:50 UTC50m
2026-06-09 HLE85 - Jun 9, 11:50 UTCJun 9, 12:25 UTC35m
2026-06-09 HLE85 - Jun 9, 10:25 UTCJun 9, 10:40 UTC15m
2026-06-08 HLE85 - Jun 8, 23:45 UTCJun 9, 01:30 UTC1h 45m
2026-06-08 HLE85 - Jun 8, 20:05 UTCJun 8, 20:20 UTC15m
2026-06-08 HLE85 - Jun 8, 18:20 UTCJun 8, 18:30 UTC10m
2026-06-08 HLE85 - Jun 8, 10:55 UTCJun 8, 12:10 UTC1h 15m
2026-06-07 HLE85 - Jun 7, 17:00 UTCJun 7, 17:35 UTC35m
2026-06-07 HLE85 - Jun 7, 15:55 UTCJun 7, 16:05 UTC10m
2026-06-07 HLE85 - Jun 7, 15:05 UTCJun 7, 15:15 UTC10m
2026-06-07 HLE85 - Jun 7, 13:25 UTCJun 7, 13:40 UTC15m
2026-06-07 HLE85 - Jun 7, 11:00 UTCJun 7, 11:55 UTC55m
2026-06-06 HLE85 - Jun 6, 21:04 UTCJun 6, 21:30 UTC25m
2026-06-06 HLE85 - Jun 6, 19:30 UTCJun 6, 19:40 UTC10m
2026-06-06 HLE85 - Jun 6, 15:34 UTCJun 6, 15:54 UTC20m
2026-06-06 HLE85 - Jun 6, 14:20 UTCJun 6, 14:50 UTC30m
2026-06-05 HLE85 - Jun 5, 22:50 UTCJun 5, 23:00 UTC10m
2026-06-05 HLE85 - Jun 5, 21:20 UTCJun 5, 21:30 UTC10m
2026-06-05 HLE85 - Jun 5, 13:25 UTCJun 5, 14:00 UTC35m
2026-06-05 HLE85 - Jun 5, 04:20 UTCJun 5, 05:05 UTC45m
2026-06-05 HLE85 - Jun 5, 03:25 UTCJun 5, 03:35 UTC10m
2026-06-04 HLE85 - Jun 4, 16:40 UTCJun 4, 16:50 UTC10m
2026-06-04 HLE85 - Jun 4, 11:10 UTCJun 4, 11:20 UTC10m
2026-06-04 HLE85 - Jun 4, 09:15 UTCJun 4, 09:30 UTC15m
2026-06-03 HLE85 - Jun 3, 21:30 UTCJun 3, 21:40 UTC10m
2026-06-03 HLE85 - Jun 3, 20:35 UTCJun 3, 20:50 UTC15m
2026-06-03 HLE85 - Jun 3, 06:45 UTCJun 3, 06:55 UTC10m
2026-06-03 HLE85 - Jun 3, 05:45 UTCJun 3, 05:55 UTC10m
2026-06-02 HLE85 - Jun 2, 08:30 UTCJun 2, 08:40 UTC10m

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

Mode-S 406F2B frequently asked

What is Mode-S code 406F2B?
406F2B is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-RESU.
Where is Mode-S 406F2B registered?
Mode-S code 406F2B 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 406F2B broadcasting right now?
Yes. Mode-S 406F2B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406F2B, octal 20067453, decimal 4,222,763.
What flights does 406F2B operate?
Mode-S 406F2B has broadcast 5 distinct callsigns, including HLE85, HLE88, RHD08, RHD04, RHD60.