Apparatus

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sensors Mode-S transponder

401855

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-AXSW · CESSNA 150

Hex
401855
Octal
20014125
Decimal
4,200,533
Country
GB
Tail
G-AXSW
Type
C150
No current signal · last broadcast 8h ago
Flights observed
61
Distinct callsigns
1
Country
GB
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 401855.

Country allocation

The ICAO 24-bit address 401855 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
GAXSW - 61 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-06 GAXSW BLK → BLK Jun 6, 12:04 UTCJun 6, 12:30 UTC25m
2026-06-06 GAXSW BLK → BLK Jun 6, 10:50 UTCJun 6, 11:09 UTC20m
2026-06-05 GAXSW BLK → BLK Jun 5, 17:25 UTCJun 5, 18:20 UTC55m
2026-06-05 GAXSW - Jun 5, 14:45 UTCJun 5, 15:45 UTC1h 0m
2026-06-05 GAXSW - Jun 5, 12:30 UTCJun 5, 13:40 UTC1h 10m
2026-06-05 GAXSW - Jun 5, 10:40 UTCJun 5, 11:35 UTC55m
2026-06-05 GAXSW - Jun 5, 08:50 UTCJun 5, 10:00 UTC1h 10m
2026-06-02 GAXSW BLK → BLK Jun 2, 14:50 UTCJun 2, 15:40 UTC50m
2026-05-30 GAXSW BLK → BLK May 30, 15:15 UTCMay 30, 15:50 UTC35m
2026-05-30 GAXSW BLK → BLK May 30, 13:15 UTCMay 30, 14:20 UTC1h 5m
2026-05-30 GAXSW BLK → BLK May 30, 12:00 UTCMay 30, 12:25 UTC25m
2026-05-30 GAXSW BLK → BLK May 30, 08:40 UTCMay 30, 09:25 UTC45m
2026-05-29 GAXSW BLK → BLK May 29, 18:10 UTCMay 29, 18:50 UTC40m
2026-05-29 GAXSW - May 29, 15:25 UTCMay 29, 16:15 UTC50m
2026-05-29 GAXSW BLK → BLK May 29, 10:55 UTCMay 29, 14:15 UTC3h 20m
2026-05-27 GAXSW BLK → BLK May 27, 13:20 UTCMay 27, 14:30 UTC1h 10m
2026-05-27 GAXSW BLK → BLK May 27, 08:25 UTCMay 27, 09:40 UTC1h 15m
2026-05-26 GAXSW - May 26, 12:40 UTCMay 26, 14:00 UTC1h 20m
2026-05-26 GAXSW BLK → BLK May 26, 08:34 UTCMay 26, 09:49 UTC1h 15m
2026-05-23 GAXSW BLK → BLK May 23, 14:35 UTCMay 23, 15:15 UTC40m
2026-05-23 GAXSW BLK → BLK May 23, 13:15 UTCMay 23, 13:45 UTC30m
2026-05-22 GAXSW BLK → BLK May 22, 14:05 UTCMay 22, 14:45 UTC40m
2026-05-22 GAXSW - May 22, 11:15 UTCMay 22, 12:10 UTC55m
2026-05-22 GAXSW - May 22, 09:00 UTCMay 22, 10:10 UTC1h 10m
2026-05-21 GAXSW BLK → BLK May 21, 14:50 UTCMay 21, 16:35 UTC1h 45m
2026-05-20 GAXSW BLK → BLK May 20, 12:50 UTCMay 20, 13:20 UTC30m
2026-05-20 GAXSW BLK → BLK May 20, 11:00 UTCMay 20, 12:00 UTC1h 0m
2026-05-20 GAXSW BLK → BLK May 20, 09:30 UTCMay 20, 10:30 UTC1h 0m
2026-05-16 GAXSW BLK → BLK May 16, 09:16 UTCMay 16, 10:01 UTC45m
2026-05-15 GAXSW BLK → BLK May 15, 18:00 UTCMay 15, 18:50 UTC50m
2026-05-15 GAXSW BLK → BLK May 15, 15:00 UTCMay 15, 16:10 UTC1h 10m
2026-05-15 GAXSW - May 15, 13:10 UTCMay 15, 13:50 UTC40m
2026-05-15 GAXSW BLK → BLK May 15, 08:55 UTCMay 15, 11:25 UTC2h 30m
2026-05-14 GAXSW BLK → BLK May 14, 15:05 UTCMay 14, 15:35 UTC30m
2026-05-14 GAXSW BLK → BLK May 14, 11:25 UTCMay 14, 12:20 UTC55m
2026-05-14 GAXSW BLK → BLK May 14, 09:15 UTCMay 14, 10:31 UTC1h 15m
2026-05-09 GAXSW BLK → BLK May 9, 10:55 UTCMay 9, 11:50 UTC55m
2026-05-08 GAXSW BLK → BLK May 8, 09:14 UTCMay 8, 10:49 UTC1h 35m
2026-05-07 GAXSW - May 7, 13:10 UTCMay 7, 14:15 UTC1h 5m
2026-05-07 GAXSW BLK → BLK May 7, 11:20 UTCMay 7, 12:05 UTC45m
2026-05-07 GAXSW BLK → BLK May 7, 08:40 UTCMay 7, 10:05 UTC1h 25m
2026-05-02 GAXSW - May 2, 14:45 UTCMay 2, 16:00 UTC1h 15m
2026-05-02 GAXSW BLK → BLK May 2, 10:30 UTCMay 2, 13:55 UTC3h 25m
2026-05-01 GAXSW - May 1, 10:50 UTCMay 1, 12:35 UTC1h 45m
2026-05-01 GAXSW - May 1, 08:50 UTCMay 1, 10:20 UTC1h 30m
2026-04-30 GAXSW CAX → BLK Apr 30, 10:35 UTCApr 30, 12:00 UTC1h 26m
2026-04-30 GAXSW BLK → CAX Apr 30, 08:55 UTCApr 30, 09:45 UTC50m
2026-04-29 GAXSW BLK → BLK Apr 29, 10:50 UTCApr 29, 11:45 UTC55m
2026-04-29 GAXSW BLK → BLK Apr 29, 08:50 UTCApr 29, 09:50 UTC1h 1m
2026-04-28 GAXSW BLK → BLK Apr 28, 11:20 UTCApr 28, 12:15 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-AXSW page for operator, model, and routing details .

Mode-S 401855 frequently asked

What is Mode-S code 401855?
401855 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-AXSW.
Where is Mode-S 401855 registered?
Mode-S code 401855 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 401855 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 401855, octal 20014125, decimal 4,200,533.
What flights does 401855 operate?
Mode-S 401855 has broadcast 1 distinct callsign, including GAXSW.