Apparatus

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sensors Mode-S transponder

40809C

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-FTRO · CESSNA 152

Hex
40809C
Octal
20100234
Decimal
4,227,228
Country
GB
Tail
G-FTRO
Type
C152
No current signal · last broadcast 50m ago
Flights observed
164
Distinct callsigns
1
Country
GB
Last broadcast
50m ago

Last known position

Most recent position reported by Mode-S 40809C.

Country allocation

The ICAO 24-bit address 40809C 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
GFTRO - 164 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 GFTRO - Jul 14, 08:35 UTCJul 14, 09:00 UTC25m
2026-07-12 GFTRO - Jul 12, 11:15 UTCJul 12, 11:50 UTC35m
2026-07-12 GFTRO - Jul 12, 08:45 UTCJul 12, 09:20 UTC35m
2026-07-11 GFTRO - Jul 11, 16:55 UTCJul 11, 17:15 UTC20m
2026-07-11 GFTRO - Jul 11, 15:30 UTCJul 11, 16:05 UTC35m
2026-07-11 GFTRO - Jul 11, 14:00 UTCJul 11, 14:20 UTC20m
2026-07-11 GFTRO - Jul 11, 12:55 UTCJul 11, 13:25 UTC30m
2026-07-11 GFTRO - Jul 11, 08:50 UTCJul 11, 10:50 UTC2h 0m
2026-07-09 GFTRO - Jul 9, 13:30 UTCJul 9, 14:35 UTC1h 5m
2026-07-09 GFTRO - Jul 9, 12:05 UTCJul 9, 12:45 UTC40m
2026-07-09 GFTRO - Jul 9, 10:30 UTCJul 9, 11:10 UTC40m
2026-07-09 GFTRO - Jul 9, 08:50 UTCJul 9, 09:25 UTC35m
2026-07-08 GFTRO - Jul 8, 11:55 UTCJul 8, 12:35 UTC40m
2026-07-08 GFTRO - Jul 8, 09:40 UTCJul 8, 11:15 UTC1h 35m
2026-07-08 GFTRO - Jul 8, 08:25 UTCJul 8, 09:05 UTC40m
2026-07-07 GFTRO - Jul 7, 14:30 UTCJul 7, 14:55 UTC25m
2026-07-07 GFTRO - Jul 7, 10:05 UTCJul 7, 10:35 UTC30m
2026-07-07 GFTRO - Jul 7, 08:30 UTCJul 7, 09:30 UTC1h 0m
2026-06-30 GFTRO - Jun 30, 13:30 UTCJun 30, 14:00 UTC30m
2026-06-30 GFTRO - Jun 30, 11:45 UTCJun 30, 12:15 UTC30m
2026-06-30 GFTRO - Jun 30, 10:25 UTCJun 30, 11:10 UTC45m
2026-06-30 GFTRO - Jun 30, 08:50 UTCJun 30, 09:20 UTC30m
2026-06-29 GFTRO - Jun 29, 16:04 UTCJun 29, 16:39 UTC35m
2026-06-29 GFTRO - Jun 29, 14:34 UTCJun 29, 15:09 UTC35m
2026-06-29 GFTRO - Jun 29, 13:04 UTCJun 29, 13:39 UTC35m
2026-06-29 GFTRO - Jun 29, 11:29 UTCJun 29, 12:09 UTC40m
2026-06-29 GFTRO - Jun 29, 09:25 UTCJun 29, 10:00 UTC35m
2026-06-28 GFTRO - Jun 28, 15:40 UTCJun 28, 16:14 UTC35m
2026-06-28 GFTRO - Jun 28, 13:55 UTCJun 28, 14:30 UTC35m
2026-06-28 GFTRO - Jun 28, 11:09 UTCJun 28, 11:59 UTC50m
2026-06-28 GFTRO - Jun 28, 09:55 UTCJun 28, 10:19 UTC25m
2026-06-27 GFTRO - Jun 27, 12:29 UTCJun 27, 13:04 UTC35m
2026-06-27 GFTRO - Jun 27, 10:05 UTCJun 27, 10:50 UTC45m
2026-06-27 GFTRO - Jun 27, 08:35 UTCJun 27, 09:04 UTC30m
2026-06-26 GFTRO - Jun 26, 12:59 UTCJun 26, 13:10 UTC10m
2026-06-25 GFTRO - Jun 25, 08:40 UTCJun 25, 09:10 UTC30m
2026-06-24 GFTRO - Jun 24, 11:29 UTCJun 24, 11:45 UTC15m
2026-06-24 GFTRO - Jun 24, 08:30 UTCJun 24, 09:24 UTC55m
2026-06-23 GFTRO - Jun 23, 10:49 UTCJun 23, 11:19 UTC30m
2026-06-23 GFTRO - Jun 23, 09:05 UTCJun 23, 09:40 UTC35m
2026-06-21 GFTRO - Jun 21, 15:49 UTCJun 21, 16:30 UTC40m
2026-06-21 GFTRO - Jun 21, 14:44 UTCJun 21, 15:09 UTC25m
2026-06-21 GFTRO - Jun 21, 13:20 UTCJun 21, 13:54 UTC35m
2026-06-21 GFTRO - Jun 21, 10:09 UTCJun 21, 10:44 UTC35m
2026-06-20 GFTRO - Jun 20, 14:59 UTCJun 20, 15:34 UTC35m
2026-06-20 GFTRO - Jun 20, 13:09 UTCJun 20, 13:55 UTC45m
2026-06-20 GFTRO - Jun 20, 11:44 UTCJun 20, 12:14 UTC30m
2026-06-20 GFTRO - Jun 20, 09:59 UTCJun 20, 10:25 UTC25m
2026-06-19 GFTRO - Jun 19, 16:55 UTCJun 19, 17:44 UTC50m
2026-06-19 GFTRO - Jun 19, 15:09 UTCJun 19, 15:59 UTC50m

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

Mode-S 40809C frequently asked

What is Mode-S code 40809C?
40809C is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-FTRO.
Where is Mode-S 40809C registered?
Mode-S code 40809C 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 40809C broadcasting right now?
No active broadcast right now. Last signal was 50m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40809C, octal 20100234, decimal 4,227,228.
What flights does 40809C operate?
Mode-S 40809C has broadcast 1 distinct callsign, including GFTRO.