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sensors Mode-S transponder

407539

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-PKHA · PILATUS PC-12

Hex
407539
Octal
20072471
Decimal
4,224,313
Country
GB
Tail
G-PKHA
Type
PC12
No current signal · last broadcast 2h ago
Flights observed
85
Distinct callsigns
7
Country
GB
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 407539.

Country allocation

The ICAO 24-bit address 407539 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
GPKHA - 75 2026-07-20
TOM81D TUI Airways 1 2026-06-07
TOM79A TUI Airways 1 2026-07-15
TOM5YG - 1 2026-07-15
TOM4TV TUI Airways 1 2026-07-18
TOM3TY TUI Airways 1 2026-06-19
TOM1WL TUI Airways 1 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 GPKHA - Jul 20, 13:00 UTCJul 20, 13:10 UTC10m
2026-07-20 GPKHA - Jul 20, 11:00 UTCJul 20, 12:20 UTC1h 20m
2026-07-20 GPKHA LBA → CRL Jul 20, 08:05 UTCJul 20, 09:25 UTC1h 20m
2026-07-19 GPKHA - Jul 19, 09:35 UTCJul 19, 10:30 UTC55m
2026-07-19 GPKHA - Jul 19, 08:10 UTCJul 19, 08:55 UTC45m
2026-07-18 TOM4TV BOJ → BHX Jul 18, 04:15 UTCJul 18, 04:25 UTC10m
2026-07-16 GPKHA - Jul 16, 10:10 UTCJul 16, 10:50 UTC40m
2026-07-16 GPKHA - Jul 16, 08:15 UTCJul 16, 09:05 UTC50m
2026-07-15 TOM79A LTN → PMI Jul 15, 15:25 UTCJul 15, 15:35 UTC10m
2026-07-15 TOM5YG - Jul 15, 02:30 UTCJul 15, 02:40 UTC10m
2026-07-14 GPKHA - Jul 14, 16:45 UTCJul 14, 17:35 UTC50m
2026-07-14 GPKHA - Jul 14, 07:10 UTCJul 14, 08:20 UTC1h 10m
2026-07-05 GPKHA - Jul 5, 08:40 UTCJul 5, 09:45 UTC1h 5m
2026-07-05 GPKHA - Jul 5, 07:20 UTCJul 5, 08:15 UTC55m
2026-07-04 GPKHA - Jul 4, 16:30 UTCJul 4, 17:45 UTC1h 15m
2026-07-04 GPKHA - Jul 4, 10:30 UTCJul 4, 11:35 UTC1h 5m
2026-07-02 GPKHA - Jul 2, 08:15 UTCJul 2, 09:20 UTC1h 5m
2026-07-01 GPKHA - Jul 1, 17:00 UTCJul 1, 17:15 UTC15m
2026-07-01 GPKHA - Jul 1, 14:25 UTCJul 1, 16:25 UTC2h 0m
2026-07-01 GPKHA - Jul 1, 12:10 UTCJul 1, 13:20 UTC1h 10m
2026-07-01 GPKHA - Jul 1, 06:20 UTCJul 1, 10:50 UTC4h 30m
2026-06-30 GPKHA - Jun 30, 15:25 UTCJun 30, 16:40 UTC1h 15m
2026-06-30 GPKHA - Jun 30, 14:10 UTCJun 30, 14:55 UTC45m
2026-06-30 GPKHA - Jun 30, 07:15 UTCJun 30, 08:20 UTC1h 5m
2026-06-29 GPKHA - Jun 29, 16:15 UTCJun 29, 16:35 UTC20m
2026-06-29 GPKHA - Jun 29, 14:29 UTCJun 29, 15:49 UTC1h 20m
2026-06-29 GPKHA - Jun 29, 11:35 UTCJun 29, 13:09 UTC1h 35m
2026-06-28 GPKHA - Jun 28, 12:55 UTCJun 28, 15:20 UTC2h 25m
2026-06-28 GPKHA - Jun 28, 08:50 UTCJun 28, 11:39 UTC2h 50m
2026-06-27 GPKHA - Jun 27, 19:55 UTCJun 27, 20:44 UTC50m
2026-06-27 GPKHA - Jun 27, 18:29 UTCJun 27, 19:34 UTC1h 5m
2026-06-27 GPKHA - Jun 27, 10:25 UTCJun 27, 11:35 UTC1h 10m
2026-06-27 GPKHA - Jun 27, 06:59 UTCJun 27, 10:19 UTC3h 20m
2026-06-24 GPKHA CAT → LBA Jun 24, 14:39 UTCJun 24, 19:15 UTC4h 35m
2026-06-23 GPKHA - Jun 23, 07:45 UTCJun 23, 11:45 UTC4h 0m
2026-06-23 GPKHA - Jun 23, 06:59 UTCJun 23, 07:35 UTC35m
2026-06-22 - - Jun 22, 23:29 UTCJun 22, 23:39 UTC10m
2026-06-20 GPKHA - Jun 20, 10:59 UTCJun 20, 13:34 UTC2h 35m
2026-06-19 TOM3TY DUB → ACE Jun 19, 01:45 UTCJun 19, 01:59 UTC15m
2026-06-18 GPKHA - Jun 18, 17:21 UTCJun 18, 18:10 UTC49m
2026-06-18 GPKHA - Jun 18, 15:30 UTCJun 18, 16:40 UTC1h 10m
2026-06-18 GPKHA LBA → NWI Jun 18, 09:10 UTCJun 18, 09:50 UTC40m
2026-06-17 - - Jun 17, 00:45 UTCJun 17, 00:55 UTC10m
2026-06-15 GPKHA - Jun 15, 14:40 UTCJun 15, 16:24 UTC1h 45m
2026-06-14 GPKHA - Jun 14, 08:45 UTCJun 14, 09:55 UTC1h 10m
2026-06-14 GPKHA - Jun 14, 07:10 UTCJun 14, 07:25 UTC15m
2026-06-11 GPKHA - Jun 11, 19:30 UTCJun 11, 20:30 UTC1h 0m
2026-06-11 GPKHA - Jun 11, 14:20 UTCJun 11, 15:20 UTC1h 0m
2026-06-11 GPKHA - Jun 11, 13:15 UTCJun 11, 14:00 UTC45m
2026-06-11 GPKHA - Jun 11, 11:50 UTCJun 11, 12:05 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-PKHA page for operator, model, and routing details .

Mode-S 407539 frequently asked

What is Mode-S code 407539?
407539 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-PKHA.
Where is Mode-S 407539 registered?
Mode-S code 407539 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 407539 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 407539, octal 20072471, decimal 4,224,313.
What flights does 407539 operate?
Mode-S 407539 has broadcast 7 distinct callsigns, including GPKHA, TOM81D, TOM79A, TOM5YG, TOM4TV.