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sensors Mode-S transponder

40431C

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
40431C
Octal
20041434
Decimal
4,211,484
Country
GB
Tail
G-BZDA
Type
P28A
Broadcasting now · callsign GBZDA · 2,050 ft
Flights observed
258
Distinct callsigns
1
Country
GB
Last broadcast
Jul 24, 17:35 UTC

Current position

40431C is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 40431C 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
GBZDA - 258 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 GBZDA - Jul 24, 17:00 UTCJul 24, 17:35 UTC35m
2026-07-24 GBZDA - Jul 24, 14:35 UTCJul 24, 15:35 UTC1h 0m
2026-07-24 GBZDA - Jul 24, 12:40 UTCJul 24, 13:25 UTC45m
2026-07-23 GBZDA - Jul 23, 16:05 UTCJul 23, 16:20 UTC15m
2026-07-23 GBZDA - Jul 23, 14:10 UTCJul 23, 15:00 UTC50m
2026-07-23 GBZDA - Jul 23, 11:40 UTCJul 23, 12:30 UTC50m
2026-07-23 GBZDA - Jul 23, 09:40 UTCJul 23, 10:35 UTC55m
2026-07-23 GBZDA - Jul 23, 08:05 UTCJul 23, 09:00 UTC55m
2026-07-22 GBZDA - Jul 22, 12:30 UTCJul 22, 13:05 UTC35m
2026-07-21 GBZDA - Jul 21, 16:05 UTCJul 21, 16:50 UTC45m
2026-07-21 GBZDA - Jul 21, 12:20 UTCJul 21, 13:00 UTC40m
2026-07-21 GBZDA - Jul 21, 09:50 UTCJul 21, 10:40 UTC50m
2026-07-20 GBZDA - Jul 20, 16:05 UTCJul 20, 16:50 UTC45m
2026-07-20 GBZDA - Jul 20, 11:45 UTCJul 20, 12:15 UTC30m
2026-07-20 GBZDA - Jul 20, 10:05 UTCJul 20, 10:50 UTC45m
2026-07-19 GBZDA - Jul 19, 15:55 UTCJul 19, 16:40 UTC45m
2026-07-19 GBZDA - Jul 19, 14:00 UTCJul 19, 15:00 UTC1h 0m
2026-07-19 GBZDA - Jul 19, 09:40 UTCJul 19, 10:25 UTC45m
2026-07-19 GBZDA - Jul 19, 08:00 UTCJul 19, 09:00 UTC1h 0m
2026-07-18 GBZDA - Jul 18, 17:40 UTCJul 18, 18:15 UTC35m
2026-07-18 GBZDA - Jul 18, 16:05 UTCJul 18, 17:00 UTC55m
2026-07-18 GBZDA - Jul 18, 12:00 UTCJul 18, 12:45 UTC45m
2026-07-18 GBZDA - Jul 18, 10:05 UTCJul 18, 10:35 UTC30m
2026-07-17 GBZDA - Jul 17, 15:10 UTCJul 17, 16:10 UTC1h 0m
2026-07-17 GBZDA - Jul 17, 12:45 UTCJul 17, 13:20 UTC35m
2026-07-17 GBZDA - Jul 17, 11:10 UTCJul 17, 11:35 UTC25m
2026-07-17 GBZDA - Jul 17, 09:35 UTCJul 17, 10:05 UTC30m
2026-07-16 GBZDA - Jul 16, 17:20 UTCJul 16, 17:40 UTC20m
2026-07-16 GBZDA - Jul 16, 16:05 UTCJul 16, 16:35 UTC30m
2026-07-16 GBZDA - Jul 16, 11:30 UTCJul 16, 11:50 UTC20m
2026-07-16 GBZDA - Jul 16, 09:55 UTCJul 16, 10:45 UTC50m
2026-07-15 GBZDA - Jul 15, 12:20 UTCJul 15, 14:10 UTC1h 50m
2026-07-15 GBZDA - Jul 15, 08:55 UTCJul 15, 09:45 UTC50m
2026-07-14 GBZDA - Jul 14, 13:10 UTCJul 14, 13:45 UTC35m
2026-07-14 GBZDA - Jul 14, 11:25 UTCJul 14, 12:00 UTC35m
2026-07-14 GBZDA - Jul 14, 10:10 UTCJul 14, 10:40 UTC30m
2026-07-13 GBZDA - Jul 13, 16:10 UTCJul 13, 17:10 UTC1h 0m
2026-07-13 GBZDA - Jul 13, 13:20 UTCJul 13, 14:20 UTC1h 0m
2026-07-13 GBZDA - Jul 13, 11:00 UTCJul 13, 11:20 UTC20m
2026-07-13 GBZDA - Jul 13, 08:55 UTCJul 13, 09:55 UTC1h 0m
2026-07-12 GBZDA - Jul 12, 12:20 UTCJul 12, 13:15 UTC55m
2026-07-12 GBZDA - Jul 12, 09:35 UTCJul 12, 10:25 UTC50m
2026-07-11 GBZDA - Jul 11, 13:20 UTCJul 11, 15:05 UTC1h 45m
2026-07-11 GBZDA - Jul 11, 10:15 UTCJul 11, 11:45 UTC1h 30m
2026-07-10 GBZDA - Jul 10, 09:05 UTCJul 10, 10:50 UTC1h 45m
2026-07-09 GBZDA - Jul 9, 17:25 UTCJul 9, 18:10 UTC45m
2026-07-09 GBZDA - Jul 9, 15:20 UTCJul 9, 15:55 UTC35m
2026-07-09 GBZDA - Jul 9, 13:35 UTCJul 9, 13:50 UTC15m
2026-07-09 GBZDA - Jul 9, 10:05 UTCJul 9, 10:45 UTC40m
2026-07-06 GBZDA - Jul 6, 12:10 UTCJul 6, 12:50 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-BZDA page for operator, model, and routing details .

Mode-S 40431C frequently asked

What is Mode-S code 40431C?
40431C is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-BZDA.
Where is Mode-S 40431C registered?
Mode-S code 40431C 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 40431C broadcasting right now?
Yes. Mode-S 40431C is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 40431C, octal 20041434, decimal 4,211,484.
What flights does 40431C operate?
Mode-S 40431C has broadcast 1 distinct callsign, including GBZDA.