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sensors Mode-S transponder

408345

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-MILS · PILATUS PC-12

Hex
408345
Octal
20101505
Decimal
4,227,909
Country
GB
Tail
G-MILS
Type
PC12
No current signal · last broadcast 10h ago
Flights observed
106
Distinct callsigns
1
Country
GB
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 408345.

Country allocation

The ICAO 24-bit address 408345 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
GMILS - 106 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 GMILS - Jul 17, 12:50 UTCJul 17, 16:19 UTC3h 30m
2026-07-16 GMILS - Jul 16, 11:40 UTCJul 16, 14:20 UTC2h 40m
2026-07-16 GMILS - Jul 16, 09:55 UTCJul 16, 10:15 UTC20m
2026-07-14 GMILS - Jul 14, 11:20 UTCJul 14, 15:30 UTC4h 10m
2026-07-14 GMILS - Jul 14, 05:50 UTCJul 14, 10:05 UTC4h 15m
2026-07-13 GMILS - Jul 13, 10:40 UTCJul 13, 13:05 UTC2h 25m
2026-07-12 GMILS - Jul 12, 07:10 UTCJul 12, 09:30 UTC2h 20m
2026-07-11 GMILS - Jul 11, 12:30 UTCJul 11, 12:40 UTC10m
2026-07-06 GMILS - Jul 6, 07:50 UTCJul 6, 12:10 UTC4h 20m
2026-07-05 GMILS - Jul 5, 15:00 UTCJul 5, 19:20 UTC4h 20m
2026-07-05 GMILS - Jul 5, 13:10 UTCJul 5, 14:10 UTC1h 0m
2026-07-05 GMILS - Jul 5, 10:40 UTCJul 5, 11:40 UTC1h 0m
2026-07-02 GMILS - Jul 2, 16:20 UTCJul 2, 18:40 UTC2h 20m
2026-07-01 GMILS - Jul 1, 16:10 UTCJul 1, 16:45 UTC35m
2026-07-01 GMILS - Jul 1, 08:55 UTCJul 1, 09:30 UTC35m
2026-06-30 GMILS - Jun 30, 13:30 UTCJun 30, 16:55 UTC3h 25m
2026-06-30 GMILS - Jun 30, 09:45 UTCJun 30, 12:00 UTC2h 15m
2026-06-27 GMILS - Jun 27, 13:49 UTCJun 27, 16:04 UTC2h 15m
2026-06-27 GMILS - Jun 27, 09:34 UTCJun 27, 12:25 UTC2h 50m
2026-06-27 GMILS - Jun 27, 08:05 UTCJun 27, 08:20 UTC15m
2026-06-24 GMILS - Jun 24, 08:09 UTCJun 24, 09:19 UTC1h 10m
2026-06-24 GMILS - Jun 24, 07:20 UTCJun 24, 07:34 UTC15m
2026-06-23 GMILS - Jun 23, 16:24 UTCJun 23, 16:39 UTC15m
2026-06-23 GMILS - Jun 23, 15:40 UTCJun 23, 15:59 UTC20m
2026-06-23 GMILS - Jun 23, 12:45 UTCJun 23, 15:24 UTC2h 40m
2026-06-21 GMILS - Jun 21, 13:20 UTCJun 21, 15:54 UTC2h 35m
2026-06-21 GMILS - Jun 21, 11:55 UTCJun 21, 12:19 UTC25m
2026-06-20 GMILS - Jun 20, 09:44 UTCJun 20, 10:15 UTC30m
2026-06-20 GMILS - Jun 20, 08:34 UTCJun 20, 09:05 UTC30m
2026-06-20 GMILS - Jun 20, 07:44 UTCJun 20, 07:54 UTC10m
2026-06-15 GMILS - Jun 15, 12:39 UTCJun 15, 12:55 UTC15m
2026-06-15 GMILS - Jun 15, 10:55 UTCJun 15, 12:15 UTC1h 20m
2026-06-14 GMILS - Jun 14, 16:00 UTCJun 14, 17:35 UTC1h 35m
2026-06-14 GMILS - Jun 14, 14:25 UTCJun 14, 15:30 UTC1h 5m
2026-06-12 GMILS - Jun 12, 18:05 UTCJun 12, 18:50 UTC45m
2026-06-12 GMILS - Jun 12, 15:00 UTCJun 12, 17:50 UTC2h 50m
2026-06-12 GMILS - Jun 12, 13:50 UTCJun 12, 14:05 UTC15m
2026-06-10 GMILS - Jun 10, 14:15 UTCJun 10, 17:05 UTC2h 50m
2026-06-10 GMILS - Jun 10, 13:20 UTCJun 10, 13:45 UTC25m
2026-06-10 GMILS - Jun 10, 07:45 UTCJun 10, 11:45 UTC4h 0m
2026-06-09 GMILS - Jun 9, 16:45 UTCJun 9, 18:50 UTC2h 5m
2026-06-09 GMILS - Jun 9, 14:45 UTCJun 9, 15:50 UTC1h 5m
2026-06-08 GMILS - Jun 8, 16:45 UTCJun 8, 19:30 UTC2h 45m
2026-06-08 GMILS - Jun 8, 11:40 UTCJun 8, 14:20 UTC2h 40m
2026-06-06 GMILS - Jun 6, 11:00 UTCJun 6, 13:39 UTC2h 40m
2026-06-06 GMILS - Jun 6, 07:15 UTCJun 6, 10:04 UTC2h 50m
2026-06-02 GMILS - Jun 2, 14:50 UTCJun 2, 19:10 UTC4h 20m
2026-06-02 GMILS - Jun 2, 09:15 UTCJun 2, 13:30 UTC4h 15m
2026-06-01 GMILS - Jun 1, 15:20 UTCJun 1, 18:15 UTC2h 55m
2026-05-31 GMILS - May 31, 08:30 UTCMay 31, 11:10 UTC2h 40m

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

Mode-S 408345 frequently asked

What is Mode-S code 408345?
408345 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-MILS.
Where is Mode-S 408345 registered?
Mode-S code 408345 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 408345 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 408345, octal 20101505, decimal 4,227,909.
What flights does 408345 operate?
Mode-S 408345 has broadcast 1 distinct callsign, including GMILS.