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sensors Mode-S transponder

408303

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CNAX · TECNAM P-2002 Sierra

Hex
408303
Octal
20101403
Decimal
4,227,843
Country
GB
Tail
G-CNAX
Type
SIRA
Broadcasting now · callsign AOS51 · 600 ft
Flights observed
215
Distinct callsigns
13
Country
GB
Last broadcast
15h ago

Current position

408303 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 408303 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 13 distinct

Callsign Airline Flights Last seen
AOS51 - 59 2026-07-13
GCNAX - 54 2026-07-13
AOS58 - 38 2026-07-03
AOS50 - 26 2026-07-04
AOS83 - 22 2026-07-07
AOS52 - 4 2026-06-23
AOS59 - 3 2026-07-08
AOS54T - 3 2026-04-13
AOS59T - 2 2026-07-02
AOS57 - 1 2026-04-24
AOS56 - 1 2026-04-21
AOS54 - 1 2026-07-01
AOS33 - 1 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AOS51 - Jul 13, 15:35 UTCJul 13, 16:25 UTC50m
2026-07-13 AOS51 GLO → GLO Jul 13, 13:45 UTCJul 13, 14:20 UTC35m
2026-07-13 GCNAX - Jul 13, 11:50 UTCJul 13, 13:00 UTC1h 10m
2026-07-13 AOS51 - Jul 13, 10:25 UTCJul 13, 11:05 UTC40m
2026-07-08 GCNAX - Jul 8, 17:10 UTCJul 8, 18:25 UTC1h 15m
2026-07-08 GCNAX GLO → BLK Jul 8, 15:30 UTCJul 8, 16:50 UTC1h 20m
2026-07-08 AOS59 GLO → GLO Jul 8, 08:40 UTCJul 8, 10:20 UTC1h 40m
2026-07-07 GCNAX GLO → GLO Jul 7, 16:35 UTCJul 7, 17:35 UTC1h 0m
2026-07-07 AOS51 GLO → GLO Jul 7, 14:45 UTCJul 7, 15:50 UTC1h 5m
2026-07-07 AOS83 - Jul 7, 12:10 UTCJul 7, 13:00 UTC50m
2026-07-06 AOS51 GLO → GLO Jul 6, 07:55 UTCJul 6, 08:45 UTC50m
2026-07-05 AOS83 GLO → GLO Jul 5, 14:00 UTCJul 5, 14:15 UTC15m
2026-07-04 AOS50 GLO → GLO Jul 4, 12:55 UTCJul 4, 14:10 UTC1h 15m
2026-07-04 AOS50 GLO → GLO Jul 4, 11:20 UTCJul 4, 12:20 UTC1h 0m
2026-07-03 AOS59 GLO → GLO Jul 3, 17:55 UTCJul 3, 18:15 UTC20m
2026-07-03 GCNAX GLO → GLO Jul 3, 14:10 UTCJul 3, 15:00 UTC50m
2026-07-03 AOS58 GLO → GLO Jul 3, 10:25 UTCJul 3, 11:20 UTC55m
2026-07-02 AOS58 GLO → GLO Jul 2, 16:15 UTCJul 2, 17:20 UTC1h 5m
2026-07-02 AOS50 - Jul 2, 14:00 UTCJul 2, 14:55 UTC55m
2026-07-02 AOS83 GLO → GLO Jul 2, 12:25 UTCJul 2, 13:25 UTC1h 0m
2026-07-02 AOS59T GLO → GLO Jul 2, 11:05 UTCJul 2, 11:40 UTC35m
2026-07-02 AOS58 - Jul 2, 08:35 UTCJul 2, 09:35 UTC1h 0m
2026-07-01 AOS58 - Jul 1, 15:10 UTCJul 1, 16:55 UTC1h 45m
2026-07-01 AOS54 GLO → GLO Jul 1, 12:15 UTCJul 1, 13:35 UTC1h 20m
2026-07-01 AOS83 GLO → GLO Jul 1, 10:35 UTCJul 1, 11:25 UTC50m
2026-07-01 AOS83 GLO → GLO Jul 1, 08:20 UTCJul 1, 09:15 UTC55m
2026-06-30 AOS83 - Jun 30, 17:20 UTCJun 30, 18:00 UTC40m
2026-06-30 AOS59T - Jun 30, 14:20 UTCJun 30, 15:45 UTC1h 25m
2026-06-30 AOS51 GLO → GLO Jun 30, 12:55 UTCJun 30, 13:25 UTC30m
2026-06-30 GCNAX - Jun 30, 08:45 UTCJun 30, 11:40 UTC2h 55m
2026-06-29 GCNAX - Jun 29, 15:54 UTCJun 29, 16:29 UTC35m
2026-06-29 GCNAX - Jun 29, 14:29 UTCJun 29, 15:04 UTC35m
2026-06-29 AOS50 GLO → GLO Jun 29, 12:05 UTCJun 29, 12:34 UTC30m
2026-06-29 AOS50 - Jun 29, 09:44 UTCJun 29, 10:59 UTC1h 15m
2026-06-29 AOS51 - Jun 29, 07:55 UTCJun 29, 08:39 UTC45m
2026-06-28 AOS83 GLO → GLO Jun 28, 14:50 UTCJun 28, 15:20 UTC30m
2026-06-28 AOS83 GLO → GLO Jun 28, 12:29 UTCJun 28, 13:29 UTC1h 0m
2026-06-28 AOS83 - Jun 28, 10:24 UTCJun 28, 11:09 UTC45m
2026-06-27 AOS50 - Jun 27, 15:30 UTCJun 27, 16:00 UTC30m
2026-06-27 AOS50 - Jun 27, 14:00 UTCJun 27, 14:39 UTC40m
2026-06-27 AOS50 GLO → GLO Jun 27, 11:59 UTCJun 27, 12:50 UTC50m
2026-06-27 AOS50 GLO → GLO Jun 27, 10:05 UTCJun 27, 10:25 UTC20m
2026-06-27 AOS50 - Jun 27, 08:20 UTCJun 27, 09:09 UTC50m
2026-06-26 GCNAX - Jun 26, 17:09 UTCJun 26, 17:59 UTC50m
2026-06-26 AOS51 GLO → GLO Jun 26, 14:55 UTCJun 26, 16:30 UTC1h 35m
2026-06-26 AOS51 GLO → GLO Jun 26, 12:59 UTCJun 26, 13:55 UTC55m
2026-06-26 AOS51 - Jun 26, 09:59 UTCJun 26, 10:50 UTC50m
2026-06-26 AOS51 - Jun 26, 07:55 UTCJun 26, 08:34 UTC40m
2026-06-25 AOS83 - Jun 25, 17:09 UTCJun 25, 17:54 UTC45m
2026-06-25 AOS51 - Jun 25, 14:39 UTCJun 25, 15:29 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-CNAX page for operator, model, and routing details .

Mode-S 408303 frequently asked

What is Mode-S code 408303?
408303 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CNAX.
Where is Mode-S 408303 registered?
Mode-S code 408303 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 408303 broadcasting right now?
Yes. Mode-S 408303 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 408303, octal 20101403, decimal 4,227,843.
What flights does 408303 operate?
Mode-S 408303 has broadcast 13 distinct callsigns, including AOS51, GCNAX, AOS58, AOS50, AOS83.