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sensors Mode-S transponder

4071AB

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
4071AB
Octal
20070653
Decimal
4,223,403
Country
GB
Tail
G-WOBR
Type
EC45
No current signal · last broadcast 10h ago
Flights observed
224
Distinct callsigns
7
Country
GB
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 4071AB.

Country allocation

The ICAO 24-bit address 4071AB 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 7 distinct

Callsign Airline Flights Last seen
HLE61 - 86 2026-07-03
HLE59 - 77 2026-07-17
HM59 - 37 2026-04-29
HMD59 - 12 2026-05-05
HM61 Air Seychelles 7 2026-05-06
GMA101P - 4 2026-05-30
HELMED61 - 1 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HLE59 - Jul 17, 19:35 UTCJul 17, 19:45 UTC10m
2026-07-17 HLE59 - Jul 17, 17:50 UTCJul 17, 18:05 UTC15m
2026-07-17 HLE59 - Jul 17, 16:40 UTCJul 17, 16:55 UTC15m
2026-07-17 HLE59 - Jul 17, 14:55 UTCJul 17, 15:05 UTC10m
2026-07-14 HLE59 - Jul 14, 14:05 UTCJul 14, 14:20 UTC15m
2026-07-13 HLE59 - Jul 13, 16:25 UTCJul 13, 16:35 UTC10m
2026-07-12 HLE59 - Jul 12, 14:15 UTCJul 12, 14:50 UTC35m
2026-07-12 HLE59 - Jul 12, 12:15 UTCJul 12, 12:40 UTC25m
2026-07-12 HLE59 - Jul 12, 10:20 UTCJul 12, 10:35 UTC15m
2026-07-11 HLE59 - Jul 11, 19:35 UTCJul 11, 19:45 UTC10m
2026-07-11 HLE59 - Jul 11, 18:30 UTCJul 11, 18:45 UTC15m
2026-07-11 HLE59 - Jul 11, 15:45 UTCJul 11, 16:05 UTC20m
2026-07-11 HLE59 - Jul 11, 11:15 UTCJul 11, 11:40 UTC25m
2026-07-10 HLE59 - Jul 10, 13:15 UTCJul 10, 13:35 UTC20m
2026-07-10 HLE59 - Jul 10, 11:25 UTCJul 10, 11:55 UTC30m
2026-07-09 HLE59 - Jul 9, 13:25 UTCJul 9, 13:45 UTC20m
2026-07-09 HLE59 - Jul 9, 11:35 UTCJul 9, 12:00 UTC25m
2026-07-08 HLE59 - Jul 8, 11:05 UTCJul 8, 11:15 UTC10m
2026-07-08 HLE59 - Jul 8, 09:20 UTCJul 8, 09:40 UTC20m
2026-07-07 HLE59 - Jul 7, 18:45 UTCJul 7, 18:55 UTC10m
2026-07-06 HLE59 - Jul 6, 19:05 UTCJul 6, 19:50 UTC45m
2026-07-06 HLE59 - Jul 6, 13:55 UTCJul 6, 14:05 UTC10m
2026-07-06 HLE59 - Jul 6, 13:00 UTCJul 6, 13:10 UTC10m
2026-07-06 HLE59 - Jul 6, 10:55 UTCJul 6, 11:05 UTC10m
2026-07-05 HLE59 - Jul 5, 18:50 UTCJul 5, 19:25 UTC35m
2026-07-05 HLE59 - Jul 5, 17:35 UTCJul 5, 18:10 UTC35m
2026-07-05 HLE59 - Jul 5, 16:25 UTCJul 5, 16:50 UTC25m
2026-07-05 HLE59 - Jul 5, 15:10 UTCJul 5, 15:45 UTC35m
2026-07-05 HLE59 - Jul 5, 13:35 UTCJul 5, 14:05 UTC30m
2026-07-04 HLE59 - Jul 4, 16:10 UTCJul 4, 16:40 UTC30m
2026-07-04 HLE59 - Jul 4, 15:25 UTCJul 4, 15:35 UTC10m
2026-07-04 HLE59 - Jul 4, 13:35 UTCJul 4, 13:55 UTC20m
2026-07-04 HLE59 - Jul 4, 12:00 UTCJul 4, 12:10 UTC10m
2026-07-04 HLE59 - Jul 4, 10:00 UTCJul 4, 10:25 UTC25m
2026-07-04 HLE59 - Jul 4, 08:55 UTCJul 4, 09:20 UTC25m
2026-07-03 HLE59 - Jul 3, 17:25 UTCJul 3, 17:45 UTC20m
2026-07-03 HLE59 - Jul 3, 16:25 UTCJul 3, 16:50 UTC25m
2026-07-03 HLE61 - Jul 3, 15:20 UTCJul 3, 15:35 UTC15m
2026-07-03 HLE61 - Jul 3, 12:45 UTCJul 3, 12:55 UTC10m
2026-07-02 HLE61 - Jul 2, 18:35 UTCJul 2, 18:50 UTC15m
2026-07-02 HLE61 - Jul 2, 17:20 UTCJul 2, 17:40 UTC20m
2026-07-02 HLE61 - Jul 2, 16:15 UTCJul 2, 16:40 UTC25m
2026-07-01 HLE61 - Jul 1, 18:45 UTCJul 1, 19:10 UTC25m
2026-07-01 HLE61 - Jul 1, 17:05 UTCJul 1, 17:25 UTC20m
2026-07-01 HLE61 - Jul 1, 15:40 UTCJul 1, 15:50 UTC10m
2026-07-01 HLE61 - Jul 1, 11:20 UTCJul 1, 12:55 UTC1h 35m
2026-07-01 HLE61 - Jul 1, 09:50 UTCJul 1, 10:00 UTC10m
2026-07-01 HLE61 - Jul 1, 07:50 UTCJul 1, 08:00 UTC10m
2026-06-30 HLE61 - Jun 30, 18:10 UTCJun 30, 18:40 UTC30m
2026-06-30 HLE61 - Jun 30, 16:45 UTCJun 30, 17:10 UTC25m

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

Mode-S 4071AB frequently asked

What is Mode-S code 4071AB?
4071AB is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-WOBR.
Where is Mode-S 4071AB registered?
Mode-S code 4071AB 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 4071AB broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4071AB, octal 20070653, decimal 4,223,403.
What flights does 4071AB operate?
Mode-S 4071AB has broadcast 7 distinct callsigns, including HLE61, HLE59, HM59, HMD59, HM61.