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sensors Mode-S transponder

408084

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CMTG · PIPER PA-28-140/150/160/180

Hex
408084
Octal
20100204
Decimal
4,227,204
Country
GB
Tail
G-CMTG
Type
P28A
No current signal · last broadcast 7h ago
Flights observed
123
Distinct callsigns
1
Country
GB
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 408084.

Country allocation

The ICAO 24-bit address 408084 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
GCMTG - 123 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GCMTG - Jul 14, 08:45 UTCJul 14, 10:35 UTC1h 50m
2026-07-13 GCMTG - Jul 13, 14:15 UTCJul 13, 15:05 UTC50m
2026-07-13 GCMTG - Jul 13, 09:00 UTCJul 13, 10:30 UTC1h 30m
2026-07-12 GCMTG - Jul 12, 10:30 UTCJul 12, 11:20 UTC50m
2026-07-11 GCMTG - Jul 11, 11:55 UTCJul 11, 12:35 UTC40m
2026-07-10 GCMTG - Jul 10, 15:05 UTCJul 10, 15:50 UTC45m
2026-07-10 GCMTG - Jul 10, 09:45 UTCJul 10, 10:20 UTC35m
2026-07-05 GCMTG - Jul 5, 15:20 UTCJul 5, 15:40 UTC20m
2026-07-05 GCMTG - Jul 5, 13:35 UTCJul 5, 14:40 UTC1h 5m
2026-07-04 GCMTG - Jul 4, 16:05 UTCJul 4, 16:45 UTC40m
2026-07-04 GCMTG - Jul 4, 11:35 UTCJul 4, 12:30 UTC55m
2026-07-04 GCMTG - Jul 4, 09:00 UTCJul 4, 10:25 UTC1h 25m
2026-07-03 GCMTG - Jul 3, 16:45 UTCJul 3, 17:25 UTC40m
2026-07-02 GCMTG - Jul 2, 16:50 UTCJul 2, 18:05 UTC1h 15m
2026-07-02 GCMTG - Jul 2, 11:55 UTCJul 2, 12:55 UTC1h 0m
2026-07-01 GCMTG - Jul 1, 15:20 UTCJul 1, 15:40 UTC20m
2026-06-30 GCMTG - Jun 30, 15:00 UTCJun 30, 15:40 UTC40m
2026-06-28 GCMTG - Jun 28, 13:19 UTCJun 28, 14:04 UTC45m
2026-06-28 GCMTG - Jun 28, 11:29 UTCJun 28, 12:25 UTC55m
2026-06-28 GCMTG - Jun 28, 08:50 UTCJun 28, 09:30 UTC40m
2026-06-27 GCMTG - Jun 27, 12:09 UTCJun 27, 12:50 UTC40m
2026-06-27 GCMTG - Jun 27, 10:45 UTCJun 27, 11:35 UTC50m
2026-06-27 GCMTG - Jun 27, 08:39 UTCJun 27, 09:34 UTC55m
2026-06-25 GCMTG - Jun 25, 16:50 UTCJun 25, 17:20 UTC30m
2026-06-25 GCMTG - Jun 25, 15:10 UTCJun 25, 15:50 UTC40m
2026-06-25 GCMTG - Jun 25, 11:35 UTCJun 25, 12:04 UTC30m
2026-06-25 GCMTG - Jun 25, 09:05 UTCJun 25, 09:34 UTC30m
2026-06-21 GCMTG - Jun 21, 14:24 UTCJun 21, 14:40 UTC15m
2026-06-21 GCMTG - Jun 21, 12:10 UTCJun 21, 13:09 UTC1h 0m
2026-06-21 GCMTG - Jun 21, 08:54 UTCJun 21, 09:15 UTC20m
2026-06-20 GCMTG - Jun 20, 13:44 UTCJun 20, 15:44 UTC2h 0m
2026-06-20 GCMTG - Jun 20, 10:44 UTCJun 20, 11:30 UTC45m
2026-06-19 GCMTG - Jun 19, 13:44 UTCJun 19, 15:04 UTC1h 20m
2026-06-18 GCMTG - Jun 18, 11:30 UTCJun 18, 12:10 UTC40m
2026-06-17 GCMTG - Jun 17, 14:40 UTCJun 17, 15:20 UTC40m
2026-06-16 GCMTG - Jun 16, 15:45 UTCJun 16, 16:55 UTC1h 10m
2026-06-14 GCMTG - Jun 14, 16:25 UTCJun 14, 16:40 UTC15m
2026-06-14 GCMTG - Jun 14, 14:40 UTCJun 14, 15:35 UTC55m
2026-06-14 GCMTG - Jun 14, 13:00 UTCJun 14, 13:50 UTC50m
2026-06-14 GCMTG - Jun 14, 08:40 UTCJun 14, 09:30 UTC50m
2026-06-13 GCMTG - Jun 13, 10:55 UTCJun 13, 11:40 UTC45m
2026-06-12 GCMTG - Jun 12, 15:55 UTCJun 12, 16:30 UTC35m
2026-06-12 GCMTG - Jun 12, 11:55 UTCJun 12, 12:25 UTC30m
2026-06-07 GCMTG - Jun 7, 16:25 UTCJun 7, 17:10 UTC45m
2026-06-06 GCMTG - Jun 6, 13:30 UTCJun 6, 14:14 UTC45m
2026-06-05 GCMTG - Jun 5, 16:10 UTCJun 5, 17:20 UTC1h 10m
2026-06-05 GCMTG - Jun 5, 11:35 UTCJun 5, 11:55 UTC20m
2026-06-04 GCMTG - Jun 4, 13:10 UTCJun 4, 14:00 UTC50m
2026-06-04 GCMTG - Jun 4, 11:50 UTCJun 4, 12:35 UTC45m
2026-06-04 GCMTG - Jun 4, 10:50 UTCJun 4, 11:15 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-CMTG page for operator, model, and routing details .

Mode-S 408084 frequently asked

What is Mode-S code 408084?
408084 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CMTG.
Where is Mode-S 408084 registered?
Mode-S code 408084 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 408084 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 408084, octal 20100204, decimal 4,227,204.
What flights does 408084 operate?
Mode-S 408084 has broadcast 1 distinct callsign, including GCMTG.