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sensors Mode-S transponder

405BD3

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to G-CJKK · Schleicher ASK 21

Hex
405BD3
Octal
20055723
Decimal
4,217,811
Country
GB
Tail
G-CJKK
Type
GLID
Broadcasting now · callsign A12 · 3,425 ft
Flights observed
87
Distinct callsigns
1
Country
GB
Last broadcast
2h ago

Current position

405BD3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 405BD3 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
A12 - 87 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 A12 UPV → UPV Jul 18, 11:45 UTCJul 18, 12:45 UTC1h 0m
2026-07-18 A12 UPV → UPV Jul 18, 10:40 UTCJul 18, 11:15 UTC35m
2026-07-18 A12 UPV → UPV Jul 18, 09:00 UTCJul 18, 09:55 UTC55m
2026-07-12 A12 UPV → UPV Jul 12, 15:01 UTCJul 12, 15:30 UTC30m
2026-07-12 A12 UPV → UPV Jul 12, 09:25 UTCJul 12, 13:50 UTC4h 25m
2026-07-11 A12 UPV → UPV Jul 11, 10:50 UTCJul 11, 14:55 UTC4h 5m
2026-07-08 A12 UPV → UPV Jul 8, 13:30 UTCJul 8, 14:50 UTC1h 20m
2026-07-08 A12 UPV → UPV Jul 8, 12:15 UTCJul 8, 12:50 UTC35m
2026-07-08 A12 UPV → UPV Jul 8, 11:05 UTCJul 8, 11:35 UTC30m
2026-07-07 A12 UPV → UPV Jul 7, 13:45 UTCJul 7, 15:25 UTC1h 40m
2026-07-07 A12 UPV → UPV Jul 7, 11:50 UTCJul 7, 13:05 UTC1h 15m
2026-07-06 A12 UPV → UPV Jul 6, 13:05 UTCJul 6, 14:30 UTC1h 25m
2026-07-06 A12 UPV → UPV Jul 6, 11:40 UTCJul 6, 12:00 UTC20m
2026-07-06 A12 UPV → UPV Jul 6, 10:45 UTCJul 6, 10:55 UTC10m
2026-07-05 A12 UPV → UPV Jul 5, 15:50 UTCJul 5, 16:00 UTC10m
2026-07-05 A12 UPV → UPV Jul 5, 15:10 UTCJul 5, 15:20 UTC10m
2026-07-05 A12 UPV → UPV Jul 5, 13:40 UTCJul 5, 14:35 UTC55m
2026-07-05 A12 UPV → UPV Jul 5, 11:30 UTCJul 5, 12:05 UTC35m
2026-07-05 A12 UPV → UPV Jul 5, 09:50 UTCJul 5, 11:00 UTC1h 10m
2026-07-04 A12 UPV → UPV Jul 4, 14:35 UTCJul 4, 14:55 UTC20m
2026-07-04 A12 UPV → UPV Jul 4, 12:55 UTCJul 4, 14:05 UTC1h 10m
2026-07-04 A12 UPV → UPV Jul 4, 10:20 UTCJul 4, 11:45 UTC1h 25m
2026-07-02 A12 UPV → UPV Jul 2, 09:20 UTCJul 2, 15:20 UTC6h 0m
2026-06-29 A12 UPV → UPV Jun 29, 09:34 UTCJun 29, 14:09 UTC4h 35m
2026-06-28 A12 UPV → UPV Jun 28, 13:25 UTCJun 28, 15:44 UTC2h 20m
2026-06-28 A12 UPV → UPV Jun 28, 10:15 UTCJun 28, 12:15 UTC2h 0m
2026-06-26 A12 UPV → UPV Jun 26, 09:05 UTCJun 26, 11:05 UTC2h 0m
2026-06-25 A12 UPV → UPV Jun 25, 12:30 UTCJun 25, 14:29 UTC2h 0m
2026-06-25 A12 UPV → UPV Jun 25, 08:45 UTCJun 25, 11:50 UTC3h 5m
2026-06-24 A12 UPV → UPV Jun 24, 14:04 UTCJun 24, 14:24 UTC20m
2026-06-24 A12 UPV → UPV Jun 24, 10:35 UTCJun 24, 13:34 UTC3h 0m
2026-06-24 A12 UPV → UPV Jun 24, 07:59 UTCJun 24, 08:55 UTC55m
2026-06-23 A12 UPV → UPV Jun 23, 12:29 UTCJun 23, 13:34 UTC1h 5m
2026-06-23 A12 UPV → UPV Jun 23, 09:14 UTCJun 23, 11:54 UTC2h 40m
2026-06-22 A12 UPV → UPV Jun 22, 14:19 UTCJun 22, 15:10 UTC50m
2026-06-22 A12 UPV → UPV Jun 22, 09:49 UTCJun 22, 13:25 UTC3h 35m
2026-06-21 A12 UPV → UPV Jun 21, 10:04 UTCJun 21, 15:09 UTC5h 5m
2026-06-19 A12 UPV → UPV Jun 19, 12:29 UTCJun 19, 13:59 UTC1h 30m
2026-06-19 A12 UPV → UPV Jun 19, 09:19 UTCJun 19, 10:59 UTC1h 40m
2026-06-18 A12 UPV → UPV Jun 18, 13:30 UTCJun 18, 14:15 UTC45m
2026-06-18 A12 UPV → UPV Jun 18, 11:55 UTCJun 18, 12:15 UTC20m
2026-06-18 A12 UPV → UPV Jun 18, 10:25 UTCJun 18, 11:05 UTC40m
2026-06-16 A12 UPV → UPV Jun 16, 14:20 UTCJun 16, 15:15 UTC55m
2026-06-15 A12 UPV → UPV Jun 15, 11:15 UTCJun 15, 12:30 UTC1h 15m
2026-06-14 A12 UPV → UPV Jun 14, 11:10 UTCJun 14, 15:40 UTC4h 30m
2026-06-14 A12 UPV → UPV Jun 14, 10:05 UTCJun 14, 10:30 UTC25m
2026-06-13 A12 UPV → UPV Jun 13, 11:30 UTCJun 13, 15:35 UTC4h 5m
2026-06-13 A12 UPV → UPV Jun 13, 09:20 UTCJun 13, 10:55 UTC1h 35m
2026-06-07 A12 UPV → UPV Jun 7, 09:45 UTCJun 7, 15:20 UTC5h 35m
2026-05-30 A12 UPV → UPV May 30, 14:40 UTCMay 30, 16:25 UTC1h 45m

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

Mode-S 405BD3 frequently asked

What is Mode-S code 405BD3?
405BD3 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to G-CJKK.
Where is Mode-S 405BD3 registered?
Mode-S code 405BD3 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 405BD3 broadcasting right now?
Yes. Mode-S 405BD3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 405BD3, octal 20055723, decimal 4,217,811.
What flights does 405BD3 operate?
Mode-S 405BD3 has broadcast 1 distinct callsign, including A12.