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sensors Mode-S transponder

404AC6

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
404AC6
Octal
20045306
Decimal
4,213,446
Country
GB
Tail
G-JACH
Type
P28A
No current signal · last broadcast 2d ago
Flights observed
71
Distinct callsigns
1
Country
GB
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 404AC6.

Country allocation

The ICAO 24-bit address 404AC6 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
GJACH - 71 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 GJACH - Jul 11, 11:00 UTCJul 11, 11:20 UTC20m
2026-07-11 GJACH - Jul 11, 09:35 UTCJul 11, 09:50 UTC15m
2026-07-09 GJACH GCI → ACI Jul 9, 15:10 UTCJul 9, 15:25 UTC15m
2026-07-09 GJACH - Jul 9, 11:40 UTCJul 9, 11:55 UTC15m
2026-07-09 GJACH GCI → ACI Jul 9, 10:45 UTCJul 9, 11:00 UTC15m
2026-07-08 GJACH - Jul 8, 10:55 UTCJul 8, 11:15 UTC20m
2026-07-07 GJACH - Jul 7, 13:55 UTCJul 7, 14:15 UTC20m
2026-07-07 GJACH - Jul 7, 13:00 UTCJul 7, 13:20 UTC20m
2026-07-02 GJACH - Jul 2, 10:40 UTCJul 2, 11:20 UTC40m
2026-07-02 GJACH - Jul 2, 08:10 UTCJul 2, 09:05 UTC55m
2026-07-01 GJACH GCI → ACI Jul 1, 15:10 UTCJul 1, 15:30 UTC20m
2026-07-01 GJACH ACI → GCI Jul 1, 08:25 UTCJul 1, 08:40 UTC15m
2026-06-29 GJACH CER → ACI Jun 29, 13:24 UTCJun 29, 13:49 UTC25m
2026-06-29 GJACH ACI → CER Jun 29, 11:45 UTCJun 29, 12:09 UTC25m
2026-06-29 GJACH - Jun 29, 10:20 UTCJun 29, 10:40 UTC20m
2026-06-29 GJACH - Jun 29, 06:44 UTCJun 29, 07:05 UTC20m
2026-06-27 GJACH - Jun 27, 15:10 UTCJun 27, 15:24 UTC15m
2026-06-27 GJACH - Jun 27, 14:00 UTCJun 27, 14:05 UTC5m
2026-06-24 GJACH - Jun 24, 12:54 UTCJun 24, 13:14 UTC20m
2026-06-24 GJACH - Jun 24, 07:05 UTCJun 24, 07:24 UTC20m
2026-06-22 GJACH - Jun 22, 16:45 UTCJun 22, 17:04 UTC20m
2026-06-22 GJACH - Jun 22, 15:10 UTCJun 22, 15:24 UTC15m
2026-06-16 GJACH GCI → ACI Jun 16, 13:09 UTCJun 16, 13:25 UTC15m
2026-06-16 GJACH - Jun 16, 12:25 UTCJun 16, 12:45 UTC20m
2026-06-08 GJACH - Jun 8, 10:30 UTCJun 8, 10:50 UTC20m
2026-06-08 GJACH - Jun 8, 07:25 UTCJun 8, 07:40 UTC15m
2026-06-02 GJACH - Jun 2, 08:05 UTCJun 2, 08:25 UTC20m
2026-06-02 GJACH - Jun 2, 07:00 UTCJun 2, 07:20 UTC20m
2026-05-30 GJACH - May 30, 14:20 UTCMay 30, 14:35 UTC15m
2026-05-30 GJACH ACI → CER May 30, 09:40 UTCMay 30, 10:00 UTC20m
2026-05-28 GJACH - May 28, 16:55 UTCMay 28, 17:10 UTC15m
2026-05-28 GJACH ACI → GCI May 28, 15:30 UTCMay 28, 15:50 UTC20m
2026-05-26 GJACH GCI → ACI May 26, 14:20 UTCMay 26, 14:35 UTC15m
2026-05-26 GJACH ACI → GCI May 26, 06:49 UTCMay 26, 07:10 UTC20m
2026-05-23 GJACH GCI → ACI May 23, 08:45 UTCMay 23, 09:00 UTC15m
2026-05-23 GJACH - May 23, 07:55 UTCMay 23, 08:10 UTC15m
2026-05-21 GJACH - May 21, 08:30 UTCMay 21, 08:40 UTC10m
2026-05-20 GJACH ACI → GCI May 20, 12:05 UTCMay 20, 12:25 UTC20m
2026-05-19 GJACH - May 19, 14:35 UTCMay 19, 14:45 UTC10m
2026-05-19 GJACH ACI → GCI May 19, 09:10 UTCMay 19, 09:30 UTC20m
2026-05-17 GJACH - May 17, 13:15 UTCMay 17, 13:35 UTC20m
2026-05-17 GJACH ACI → CER May 17, 12:15 UTCMay 17, 12:35 UTC20m
2026-05-12 GJACH - May 12, 14:00 UTCMay 12, 15:10 UTC1h 10m
2026-05-12 GJACH NQY → ACI May 12, 09:25 UTCMay 12, 10:30 UTC1h 5m
2026-05-12 GJACH ACI → NQY May 12, 06:45 UTCMay 12, 08:10 UTC1h 25m
2026-05-11 GJACH GCI → ACI May 11, 12:10 UTCMay 11, 12:25 UTC15m
2026-05-10 GJACH - May 10, 15:29 UTCMay 10, 15:39 UTC10m
2026-05-07 GJACH - May 7, 08:45 UTCMay 7, 09:05 UTC20m
2026-05-07 GJACH - May 7, 07:25 UTCMay 7, 07:45 UTC20m
2026-05-06 GJACH GCI → ACI May 6, 15:10 UTCMay 6, 15:25 UTC15m

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

Mode-S 404AC6 frequently asked

What is Mode-S code 404AC6?
404AC6 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-JACH.
Where is Mode-S 404AC6 registered?
Mode-S code 404AC6 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 404AC6 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 404AC6, octal 20045306, decimal 4,213,446.
What flights does 404AC6 operate?
Mode-S 404AC6 has broadcast 1 distinct callsign, including GJACH.