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sensors Mode-S transponder

406BCC

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CIIA · P&M Aviation Quik / Quantum

Hex
406BCC
Octal
20065714
Decimal
4,221,900
Country
GB
Tail
G-CIIA
Type
ULAC
No current signal · last broadcast 3h ago
Flights observed
55
Distinct callsigns
1
Country
GB
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 406BCC.

Country allocation

The ICAO 24-bit address 406BCC 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
GCIIA - 55 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 GCIIA - Jul 23, 12:50 UTCJul 23, 13:15 UTC25m
2026-07-23 GCIIA - Jul 23, 10:15 UTCJul 23, 10:50 UTC35m
2026-07-22 GCIIA - Jul 22, 14:55 UTCJul 22, 15:35 UTC40m
2026-07-22 GCIIA - Jul 22, 12:35 UTCJul 22, 12:45 UTC10m
2026-07-19 GCIIA - Jul 19, 13:35 UTCJul 19, 14:35 UTC1h 0m
2026-07-19 GCIIA - Jul 19, 10:20 UTCJul 19, 10:55 UTC35m
2026-07-19 GCIIA - Jul 19, 08:35 UTCJul 19, 09:05 UTC30m
2026-07-18 GCIIA - Jul 18, 15:40 UTCJul 18, 16:15 UTC35m
2026-07-18 GCIIA - Jul 18, 13:35 UTCJul 18, 13:45 UTC10m
2026-07-18 GCIIA - Jul 18, 08:50 UTCJul 18, 09:20 UTC30m
2026-07-17 GCIIA - Jul 17, 10:50 UTCJul 17, 11:25 UTC35m
2026-07-16 GCIIA - Jul 16, 15:05 UTCJul 16, 15:30 UTC25m
2026-07-15 GCIIA - Jul 15, 10:25 UTCJul 15, 11:05 UTC40m
2026-07-15 GCIIA - Jul 15, 09:25 UTCJul 15, 09:35 UTC10m
2026-07-12 GCIIA - Jul 12, 13:05 UTCJul 12, 14:25 UTC1h 20m
2026-07-12 GCIIA - Jul 12, 10:55 UTCJul 12, 11:15 UTC20m
2026-07-10 GCIIA - Jul 10, 13:25 UTCJul 10, 13:45 UTC20m
2026-07-09 GCIIA - Jul 9, 14:30 UTCJul 9, 15:00 UTC30m
2026-07-09 GCIIA - Jul 9, 11:05 UTCJul 9, 11:30 UTC25m
2026-07-08 GCIIA - Jul 8, 13:55 UTCJul 8, 14:30 UTC35m
2026-07-08 GCIIA - Jul 8, 11:25 UTCJul 8, 11:40 UTC15m
2026-07-05 GCIIA - Jul 5, 10:10 UTCJul 5, 10:30 UTC20m
2026-07-01 GCIIA - Jul 1, 09:10 UTCJul 1, 09:35 UTC25m
2026-06-26 GCIIA - Jun 26, 10:35 UTCJun 26, 10:50 UTC15m
2026-06-25 GCIIA - Jun 25, 15:04 UTCJun 25, 15:34 UTC30m
2026-06-21 GCIIA - Jun 21, 14:24 UTCJun 21, 15:05 UTC40m
2026-06-21 GCIIA - Jun 21, 10:40 UTCJun 21, 11:00 UTC20m
2026-06-21 GCIIA - Jun 21, 09:00 UTCJun 21, 09:15 UTC15m
2026-06-20 GCIIA - Jun 20, 15:09 UTCJun 20, 15:54 UTC45m
2026-06-20 GCIIA - Jun 20, 10:34 UTCJun 20, 11:20 UTC45m
2026-06-20 GCIIA - Jun 20, 08:49 UTCJun 20, 09:19 UTC30m
2026-05-25 GCIIA - May 25, 10:30 UTCMay 25, 11:20 UTC50m
2026-05-24 GCIIA - May 24, 14:15 UTCMay 24, 14:50 UTC35m
2026-05-24 GCIIA - May 24, 12:45 UTCMay 24, 13:20 UTC35m
2026-05-24 GCIIA - May 24, 08:50 UTCMay 24, 09:20 UTC30m
2026-05-23 GCIIA - May 23, 12:35 UTCMay 23, 13:10 UTC35m
2026-05-23 GCIIA - May 23, 08:30 UTCMay 23, 10:10 UTC1h 40m
2026-05-10 GCIIA - May 10, 14:59 UTCMay 10, 15:39 UTC40m
2026-05-10 GCIIA - May 10, 13:05 UTCMay 10, 13:14 UTC10m
2026-05-10 GCIIA - May 10, 10:35 UTCMay 10, 11:00 UTC25m
2026-05-09 GCIIA - May 9, 14:55 UTCMay 9, 15:05 UTC10m
2026-05-08 GCIIA - May 8, 08:19 UTCMay 8, 08:59 UTC40m
2026-05-06 GCIIA - May 6, 10:55 UTCMay 6, 11:30 UTC35m
2026-05-02 GCIIA - May 2, 11:15 UTCMay 2, 11:25 UTC10m
2026-05-02 GCIIA - May 2, 09:40 UTCMay 2, 09:50 UTC10m
2026-05-02 GCIIA - May 2, 08:30 UTCMay 2, 08:40 UTC10m
2026-05-01 GCIIA - May 1, 09:15 UTCMay 1, 09:45 UTC30m
2026-04-25 GCIIA - Apr 25, 14:55 UTCApr 25, 15:50 UTC55m
2026-04-25 GCIIA - Apr 25, 10:30 UTCApr 25, 10:45 UTC15m
2026-04-24 GCIIA - Apr 24, 13:25 UTCApr 24, 14:00 UTC35m

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

Mode-S 406BCC frequently asked

What is Mode-S code 406BCC?
406BCC is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CIIA.
Where is Mode-S 406BCC registered?
Mode-S code 406BCC 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 406BCC broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 406BCC, octal 20065714, decimal 4,221,900.
What flights does 406BCC operate?
Mode-S 406BCC has broadcast 1 distinct callsign, including GCIIA.