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sensors Mode-S transponder

40438D

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
40438D
Octal
20041615
Decimal
4,211,597
Country
GB
Tail
G-GYTO
Type
P28A
Broadcasting now · callsign GGYTO · 350 ft
Flights observed
109
Distinct callsigns
1
Country
GB
Last broadcast
1h ago

Current position

40438D is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40438D 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
GGYTO - 109 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-07 GGYTO - Jul 7, 15:10 UTCJul 7, 15:15 UTC5m
2026-07-07 GGYTO - Jul 7, 13:10 UTCJul 7, 13:50 UTC40m
2026-07-07 GGYTO - Jul 7, 12:15 UTCJul 7, 12:35 UTC20m
2026-07-07 GGYTO - Jul 7, 11:45 UTCJul 7, 12:10 UTC25m
2026-07-07 GGYTO - Jul 7, 10:10 UTCJul 7, 10:50 UTC40m
2026-07-06 GGYTO - Jul 6, 12:35 UTCJul 6, 13:25 UTC50m
2026-07-06 GGYTO - Jul 6, 11:15 UTCJul 6, 12:05 UTC50m
2026-07-06 GGYTO - Jul 6, 09:40 UTCJul 6, 10:40 UTC1h 0m
2026-07-04 GGYTO - Jul 4, 13:50 UTCJul 4, 14:30 UTC40m
2026-07-04 GGYTO - Jul 4, 11:55 UTCJul 4, 12:50 UTC55m
2026-07-04 GGYTO - Jul 4, 10:35 UTCJul 4, 10:50 UTC15m
2026-07-04 GGYTO - Jul 4, 10:05 UTCJul 4, 10:20 UTC15m
2026-07-04 GGYTO - Jul 4, 08:15 UTCJul 4, 09:00 UTC45m
2026-07-03 GGYTO - Jul 3, 15:30 UTCJul 3, 16:15 UTC45m
2026-07-03 GGYTO - Jul 3, 10:50 UTCJul 3, 12:45 UTC1h 55m
2026-07-02 GGYTO - Jul 2, 16:35 UTCJul 2, 17:35 UTC1h 0m
2026-07-02 GGYTO - Jul 2, 14:40 UTCJul 2, 15:05 UTC25m
2026-07-01 GGYTO - Jul 1, 15:55 UTCJul 1, 17:10 UTC1h 15m
2026-07-01 GGYTO - Jul 1, 14:00 UTCJul 1, 14:35 UTC35m
2026-06-29 GGYTO - Jun 29, 16:04 UTCJun 29, 16:55 UTC50m
2026-06-29 GGYTO - Jun 29, 13:54 UTCJun 29, 14:44 UTC50m
2026-06-29 GGYTO - Jun 29, 11:55 UTCJun 29, 12:39 UTC45m
2026-06-29 GGYTO - Jun 29, 09:44 UTCJun 29, 10:34 UTC50m
2026-06-29 GGYTO - Jun 29, 08:29 UTCJun 29, 09:00 UTC30m
2026-06-28 GGYTO - Jun 28, 16:05 UTCJun 28, 17:00 UTC55m
2026-06-28 GGYTO - Jun 28, 14:09 UTCJun 28, 14:54 UTC45m
2026-06-28 GGYTO - Jun 28, 12:09 UTCJun 28, 12:50 UTC40m
2026-06-28 GGYTO - Jun 28, 11:04 UTCJun 28, 11:29 UTC25m
2026-06-28 GGYTO - Jun 28, 10:04 UTCJun 28, 10:30 UTC25m
2026-06-28 GGYTO - Jun 28, 07:44 UTCJun 28, 08:50 UTC1h 5m
2026-06-27 GGYTO - Jun 27, 16:04 UTCJun 27, 17:14 UTC1h 10m
2026-06-24 GGYTO - Jun 24, 16:59 UTCJun 24, 17:55 UTC55m
2026-06-24 GGYTO - Jun 24, 08:39 UTCJun 24, 09:55 UTC1h 15m
2026-06-22 GGYTO - Jun 22, 13:39 UTCJun 22, 13:59 UTC20m
2026-06-22 GGYTO - Jun 22, 12:00 UTCJun 22, 12:30 UTC30m
2026-06-22 GGYTO - Jun 22, 10:15 UTCJun 22, 10:34 UTC20m
2026-06-22 GGYTO - Jun 22, 07:45 UTCJun 22, 08:35 UTC50m
2026-06-21 GGYTO - Jun 21, 13:04 UTCJun 21, 14:34 UTC1h 30m
2026-06-21 GGYTO - Jun 21, 11:15 UTCJun 21, 12:10 UTC55m
2026-06-20 GGYTO - Jun 20, 17:44 UTCJun 20, 18:24 UTC40m
2026-06-20 GGYTO - Jun 20, 15:29 UTCJun 20, 16:19 UTC50m
2026-06-19 GGYTO - Jun 19, 12:54 UTCJun 19, 13:44 UTC50m
2026-06-19 GGYTO - Jun 19, 09:44 UTCJun 19, 10:09 UTC25m
2026-06-17 GGYTO - Jun 17, 16:15 UTCJun 17, 17:15 UTC1h 0m
2026-06-16 GGYTO - Jun 16, 15:55 UTCJun 16, 17:05 UTC1h 10m
2026-06-16 GGYTO - Jun 16, 13:34 UTCJun 16, 15:05 UTC1h 30m
2026-06-16 GGYTO - Jun 16, 12:00 UTCJun 16, 12:50 UTC50m
2026-06-16 GGYTO - Jun 16, 09:50 UTCJun 16, 10:40 UTC50m
2026-06-16 GGYTO - Jun 16, 07:50 UTCJun 16, 08:39 UTC50m
2026-06-15 GGYTO - Jun 15, 16:09 UTCJun 15, 16:49 UTC40m

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

Mode-S 40438D frequently asked

What is Mode-S code 40438D?
40438D is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-GYTO.
Where is Mode-S 40438D registered?
Mode-S code 40438D 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 40438D broadcasting right now?
Yes. Mode-S 40438D is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40438D, octal 20041615, decimal 4,211,597.
What flights does 40438D operate?
Mode-S 40438D has broadcast 1 distinct callsign, including GGYTO.