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sensors Mode-S transponder

406A1B

ICAO 24-bit transponder address · allocated to United Kingdom

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

Hex
406A1B
Octal
20065033
Decimal
4,221,467
Country
GB
Tail
G-UCAN
Type
SIRA
No current signal · last broadcast Jul 24, 13:10 UTC
Flights observed
64
Distinct callsigns
2
Country
GB
Last broadcast
Jul 24, 13:10 UTC

Last known position

Most recent position reported by Mode-S 406A1B.

Country allocation

The ICAO 24-bit address 406A1B 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 2 distinct

Callsign Airline Flights Last seen
ABLE01 - 52 2026-07-16
GUCAN - 12 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 GUCAN - Jul 24, 12:20 UTCJul 24, 13:10 UTC50m
2026-07-24 GUCAN - Jul 24, 09:45 UTCJul 24, 10:25 UTC40m
2026-07-21 GUCAN BBS → BBS Jul 21, 12:10 UTCJul 21, 12:55 UTC45m
2026-07-20 GUCAN - Jul 20, 13:50 UTCJul 20, 14:35 UTC45m
2026-07-20 GUCAN - Jul 20, 11:35 UTCJul 20, 12:15 UTC40m
2026-07-19 GUCAN BBS → BBS Jul 19, 08:00 UTCJul 19, 10:05 UTC2h 5m
2026-07-18 GUCAN BBS → BBS Jul 18, 14:00 UTCJul 18, 14:15 UTC15m
2026-07-18 GUCAN BBS → BBS Jul 18, 12:25 UTCJul 18, 13:05 UTC40m
2026-07-18 GUCAN BBS → BBS Jul 18, 10:25 UTCJul 18, 10:50 UTC25m
2026-07-17 GUCAN BBS → BBS Jul 17, 10:25 UTCJul 17, 10:50 UTC25m
2026-07-16 GUCAN GBA → BBS Jul 16, 14:25 UTCJul 16, 15:25 UTC1h 0m
2026-07-16 GUCAN - Jul 16, 12:25 UTCJul 16, 12:55 UTC30m
2026-07-16 ABLE01 - Jul 16, 10:20 UTCJul 16, 10:59 UTC40m
2026-07-15 ABLE01 - Jul 15, 15:00 UTCJul 15, 15:55 UTC55m
2026-07-15 ABLE01 - Jul 15, 13:45 UTCJul 15, 14:15 UTC30m
2026-07-14 ABLE01 - Jul 14, 12:30 UTCJul 14, 13:15 UTC45m
2026-07-11 ABLE01 BBS → BBS Jul 11, 14:40 UTCJul 11, 15:05 UTC25m
2026-07-11 ABLE01 - Jul 11, 12:30 UTCJul 11, 13:50 UTC1h 20m
2026-07-11 ABLE01 BBS → BBS Jul 11, 10:20 UTCJul 11, 10:40 UTC20m
2026-07-11 ABLE01 BBS → BBS Jul 11, 09:30 UTCJul 11, 09:50 UTC20m
2026-07-10 ABLE01 ESH → BBS Jul 10, 15:20 UTCJul 10, 15:55 UTC35m
2026-07-10 ABLE01 FAB → ESH Jul 10, 12:45 UTCJul 10, 13:25 UTC40m
2026-07-09 ABLE01 - Jul 9, 10:10 UTCJul 9, 11:05 UTC55m
2026-07-08 ABLE01 - Jul 8, 14:15 UTCJul 8, 15:05 UTC50m
2026-07-08 ABLE01 BBS → BBS Jul 8, 12:20 UTCJul 8, 13:10 UTC50m
2026-07-04 ABLE01 - Jul 4, 13:30 UTCJul 4, 13:50 UTC20m
2026-07-04 ABLE01 BBS → BBS Jul 4, 12:00 UTCJul 4, 12:20 UTC20m
2026-07-04 ABLE01 - Jul 4, 11:05 UTCJul 4, 11:20 UTC15m
2026-07-04 ABLE01 - Jul 4, 10:05 UTCJul 4, 10:25 UTC20m
2026-06-30 ABLE01 BBS → BBS Jun 30, 13:50 UTCJun 30, 14:10 UTC20m
2026-06-30 ABLE01 BBS → BBS Jun 30, 12:40 UTCJun 30, 13:00 UTC20m
2026-06-30 ABLE01 - Jun 30, 11:00 UTCJun 30, 11:20 UTC20m
2026-06-26 ABLE01 - Jun 26, 11:05 UTCJun 26, 12:19 UTC1h 15m
2026-06-26 ABLE01 - Jun 26, 09:00 UTCJun 26, 09:59 UTC1h 0m
2026-06-23 ABLE01 BBS → BBS Jun 23, 13:55 UTCJun 23, 14:35 UTC40m
2026-06-20 ABLE01 - Jun 20, 14:39 UTCJun 20, 15:04 UTC25m
2026-06-20 ABLE01 BBS → BBS Jun 20, 12:24 UTCJun 20, 13:24 UTC1h 0m
2026-06-15 ABLE01 - Jun 15, 12:10 UTCJun 15, 14:10 UTC2h 0m
2026-06-15 ABLE01 - Jun 15, 10:09 UTCJun 15, 11:00 UTC50m
2026-06-13 ABLE01 - Jun 13, 14:40 UTCJun 13, 15:50 UTC1h 10m
2026-06-13 ABLE01 - Jun 13, 10:55 UTCJun 13, 12:15 UTC1h 20m
2026-06-12 ABLE01 - Jun 12, 14:30 UTCJun 12, 15:05 UTC35m
2026-06-12 ABLE01 - Jun 12, 12:40 UTCJun 12, 13:25 UTC45m
2026-06-09 ABLE01 - Jun 9, 13:45 UTCJun 9, 15:10 UTC1h 25m
2026-06-04 ABLE01 - Jun 4, 11:30 UTCJun 4, 11:45 UTC15m
2026-06-04 ABLE01 - Jun 4, 10:20 UTCJun 4, 10:45 UTC25m
2026-06-04 ABLE01 BBS → BOH Jun 4, 09:05 UTCJun 4, 09:55 UTC50m
2026-06-01 ABLE01 - Jun 1, 13:20 UTCJun 1, 14:00 UTC40m
2026-05-28 ABLE01 - May 28, 13:25 UTCMay 28, 14:00 UTC35m
2026-05-27 ABLE01 - May 27, 10:50 UTCMay 27, 11:05 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-UCAN page for operator, model, and routing details .

Mode-S 406A1B frequently asked

What is Mode-S code 406A1B?
406A1B is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-UCAN.
Where is Mode-S 406A1B registered?
Mode-S code 406A1B 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 406A1B broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 13:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406A1B, octal 20065033, decimal 4,221,467.
What flights does 406A1B operate?
Mode-S 406A1B has broadcast 2 distinct callsigns, including ABLE01, GUCAN.