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sensors Mode-S transponder

40766A

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CKYL · IKARUS C-42 Bison

Hex
40766A
Octal
20073152
Decimal
4,224,618
Country
GB
Tail
G-CKYL
Type
C42
Broadcasting now · callsign GCKYL · 2,525 ft
Flights observed
75
Distinct callsigns
1
Country
GB
Last broadcast
17h ago

Current position

40766A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40766A 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
GCKYL - 75 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 GCKYL - Jul 17, 18:55 UTCJul 17, 19:09 UTC15m
2026-07-17 GCKYL - Jul 17, 18:10 UTCJul 17, 18:29 UTC20m
2026-07-17 GCKYL - Jul 17, 13:45 UTCJul 17, 14:39 UTC55m
2026-07-17 GCKYL - Jul 17, 11:00 UTCJul 17, 12:00 UTC1h 0m
2026-07-17 GCKYL - Jul 17, 09:04 UTCJul 17, 09:25 UTC20m
2026-07-17 GCKYL - Jul 17, 08:30 UTCJul 17, 08:49 UTC20m
2026-07-16 GCKYL - Jul 16, 14:20 UTCJul 16, 15:05 UTC45m
2026-07-16 GCKYL - Jul 16, 11:54 UTCJul 16, 12:14 UTC20m
2026-07-16 GCKYL - Jul 16, 11:10 UTCJul 16, 11:20 UTC10m
2026-07-16 GCKYL - Jul 16, 09:05 UTCJul 16, 09:55 UTC50m
2026-07-11 GCKYL - Jul 11, 11:55 UTCJul 11, 12:50 UTC55m
2026-07-11 GCKYL - Jul 11, 09:20 UTCJul 11, 10:15 UTC55m
2026-07-10 GCKYL - Jul 10, 08:45 UTCJul 10, 09:20 UTC35m
2026-07-08 GCKYL - Jul 8, 12:45 UTCJul 8, 13:25 UTC40m
2026-07-08 GCKYL - Jul 8, 08:40 UTCJul 8, 09:30 UTC50m
2026-07-04 GCKYL - Jul 4, 10:45 UTCJul 4, 11:30 UTC45m
2026-07-04 GCKYL - Jul 4, 09:15 UTCJul 4, 10:15 UTC1h 0m
2026-07-03 GCKYL - Jul 3, 14:10 UTCJul 3, 15:10 UTC1h 0m
2026-07-03 GCKYL - Jul 3, 11:55 UTCJul 3, 13:20 UTC1h 25m
2026-07-03 GCKYL - Jul 3, 08:55 UTCJul 3, 10:00 UTC1h 5m
2026-07-01 GCKYL - Jul 1, 13:25 UTCJul 1, 14:20 UTC55m
2026-07-01 GCKYL - Jul 1, 11:15 UTCJul 1, 11:55 UTC40m
2026-07-01 GCKYL - Jul 1, 10:50 UTCJul 1, 11:10 UTC20m
2026-07-01 GCKYL - Jul 1, 09:05 UTCJul 1, 09:45 UTC40m
2026-06-29 GCKYL - Jun 29, 14:19 UTCJun 29, 15:24 UTC1h 5m
2026-06-21 GCKYL - Jun 21, 12:49 UTCJun 21, 13:34 UTC45m
2026-06-21 GCKYL - Jun 21, 10:04 UTCJun 21, 10:44 UTC40m
2026-06-19 GCKYL - Jun 19, 10:44 UTCJun 19, 10:59 UTC15m
2026-06-19 GCKYL - Jun 19, 08:24 UTCJun 19, 08:59 UTC35m
2026-06-16 GCKYL - Jun 16, 14:05 UTCJun 16, 14:35 UTC30m
2026-06-16 GCKYL - Jun 16, 13:30 UTCJun 16, 14:00 UTC30m
2026-06-14 GCKYL - Jun 14, 12:45 UTCJun 14, 13:30 UTC45m
2026-06-14 GCKYL - Jun 14, 10:25 UTCJun 14, 11:30 UTC1h 5m
2026-06-14 GCKYL - Jun 14, 08:35 UTCJun 14, 09:10 UTC35m
2026-06-13 GCKYL - Jun 13, 14:35 UTCJun 13, 15:45 UTC1h 10m
2026-06-13 GCKYL - Jun 13, 12:10 UTCJun 13, 12:45 UTC35m
2026-06-13 GCKYL - Jun 13, 11:30 UTCJun 13, 11:45 UTC15m
2026-06-13 GCKYL - Jun 13, 11:10 UTCJun 13, 11:25 UTC15m
2026-06-13 GCKYL - Jun 13, 09:35 UTCJun 13, 09:45 UTC10m
2026-06-13 GCKYL - Jun 13, 08:55 UTCJun 13, 09:20 UTC25m
2026-06-05 GCKYL - Jun 5, 15:15 UTCJun 5, 15:50 UTC35m
2026-05-30 GCKYL - May 30, 14:50 UTCMay 30, 15:10 UTC20m
2026-05-30 GCKYL - May 30, 14:00 UTCMay 30, 14:15 UTC15m
2026-05-30 GCKYL - May 30, 13:15 UTCMay 30, 13:40 UTC25m
2026-05-30 GCKYL - May 30, 11:30 UTCMay 30, 11:50 UTC20m
2026-05-30 GCKYL - May 30, 10:50 UTCMay 30, 11:10 UTC20m
2026-05-30 GCKYL - May 30, 10:05 UTCMay 30, 10:25 UTC20m
2026-05-30 GCKYL - May 30, 09:20 UTCMay 30, 09:40 UTC20m
2026-05-29 GCKYL - May 29, 15:15 UTCMay 29, 15:55 UTC41m
2026-05-29 GCKYL - May 29, 13:15 UTCMay 29, 14:10 UTC55m

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

Mode-S 40766A frequently asked

What is Mode-S code 40766A?
40766A is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CKYL.
Where is Mode-S 40766A registered?
Mode-S code 40766A 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 40766A broadcasting right now?
Yes. Mode-S 40766A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40766A, octal 20073152, decimal 4,224,618.
What flights does 40766A operate?
Mode-S 40766A has broadcast 1 distinct callsign, including GCKYL.