Apparatus

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sensors Mode-S transponder

424C79

ICAO 24-bit transponder address · allocated to United Kingdom

Currently assigned to M-JCBA · AGUSTA AW-139

Hex
424C79
Octal
20446171
Decimal
4,344,953
Country
GB
Tail
M-JCBA
Type
A139
No current signal · last broadcast 8d ago
Flights observed
112
Distinct callsigns
4
Country
GB
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S 424C79.

Country allocation

The ICAO 24-bit address 424C79 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 4 distinct

Callsign Airline Flights Last seen
JCB2 - 61 2026-07-05
JCB02 - 47 2026-05-08
JKY23 - 3 2026-07-05
GOLD02 - 1 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 JCB2 OXF → EMA Jul 5, 19:00 UTCJul 5, 20:55 UTC1h 55m
2026-07-05 JKY23 - Jul 5, 16:35 UTCJul 5, 16:50 UTC15m
2026-07-05 JKY23 - Jul 5, 16:15 UTCJul 5, 16:30 UTC15m
2026-07-05 JCB2 - Jul 5, 13:30 UTCJul 5, 15:35 UTC2h 5m
2026-07-05 JKY23 - Jul 5, 10:45 UTCJul 5, 11:55 UTC1h 10m
2026-07-04 JCB2 - Jul 4, 15:15 UTCJul 4, 16:10 UTC55m
2026-07-04 JCB2 - Jul 4, 13:45 UTCJul 4, 14:10 UTC25m
2026-07-04 JCB2 - Jul 4, 11:35 UTCJul 4, 13:15 UTC1h 40m
2026-06-24 JCB2 - Jun 24, 12:44 UTCJun 24, 13:30 UTC45m
2026-06-24 JCB2 - Jun 24, 09:39 UTCJun 24, 09:49 UTC10m
2026-06-24 JCB2 - Jun 24, 07:44 UTCJun 24, 08:45 UTC1h 0m
2026-06-23 JCB2 - Jun 23, 16:05 UTCJun 23, 16:35 UTC30m
2026-06-23 JCB2 - Jun 23, 13:34 UTCJun 23, 15:34 UTC2h 0m
2026-06-23 JCB2 - Jun 23, 09:20 UTCJun 23, 10:55 UTC1h 35m
2026-06-23 JCB2 - Jun 23, 07:15 UTCJun 23, 08:09 UTC55m
2026-06-22 JCB2 - Jun 22, 15:40 UTCJun 22, 16:29 UTC50m
2026-06-22 JCB2 - Jun 22, 12:34 UTCJun 22, 14:59 UTC2h 25m
2026-06-22 JCB2 - Jun 22, 06:15 UTCJun 22, 09:24 UTC3h 10m
2026-06-19 JCB2 - Jun 19, 14:59 UTCJun 19, 15:39 UTC40m
2026-06-19 JCB2 - Jun 19, 13:29 UTCJun 19, 14:44 UTC1h 15m
2026-06-19 JCB2 - Jun 19, 12:09 UTCJun 19, 12:25 UTC15m
2026-06-18 JCB2 - Jun 18, 15:50 UTCJun 18, 16:55 UTC1h 5m
2026-06-18 JCB2 - Jun 18, 12:05 UTCJun 18, 12:50 UTC45m
2026-06-18 JCB2 - Jun 18, 11:00 UTCJun 18, 11:50 UTC50m
2026-06-18 JCB2 - Jun 18, 10:15 UTCJun 18, 10:25 UTC10m
2026-06-17 JCB2 - Jun 17, 18:35 UTCJun 17, 19:10 UTC35m
2026-06-17 GOLD02 - Jun 17, 17:15 UTCJun 17, 17:55 UTC40m
2026-06-17 JCB2 - Jun 17, 09:25 UTCJun 17, 10:35 UTC1h 10m
2026-06-10 JCB2 - Jun 10, 09:25 UTCJun 10, 09:35 UTC10m
2026-06-10 JCB2 - Jun 10, 07:25 UTCJun 10, 08:10 UTC45m
2026-06-09 JCB2 - Jun 9, 15:05 UTCJun 9, 15:50 UTC45m
2026-06-09 JCB2 - Jun 9, 13:15 UTCJun 9, 14:10 UTC55m
2026-06-09 JCB2 - Jun 9, 11:35 UTCJun 9, 12:40 UTC1h 5m
2026-06-09 JCB2 - Jun 9, 10:25 UTCJun 9, 10:50 UTC25m
2026-06-09 JCB2 - Jun 9, 08:25 UTCJun 9, 08:50 UTC25m
2026-06-08 JCB2 - Jun 8, 15:35 UTCJun 8, 16:20 UTC45m
2026-06-08 JCB2 - Jun 8, 10:55 UTCJun 8, 12:00 UTC1h 5m
2026-06-08 JCB2 - Jun 8, 07:30 UTCJun 8, 10:15 UTC2h 45m
2026-06-05 JCB2 - Jun 5, 13:40 UTCJun 5, 14:45 UTC1h 5m
2026-06-05 JCB2 - Jun 5, 08:05 UTCJun 5, 08:30 UTC25m
2026-06-04 JCB2 - Jun 4, 15:50 UTCJun 4, 16:35 UTC45m
2026-06-04 JCB2 - Jun 4, 12:15 UTCJun 4, 12:30 UTC15m
2026-06-04 JCB2 - Jun 4, 08:45 UTCJun 4, 10:05 UTC1h 20m
2026-06-04 JCB2 - Jun 4, 07:40 UTCJun 4, 07:50 UTC10m
2026-06-03 JCB2 - Jun 3, 15:25 UTCJun 3, 16:20 UTC55m
2026-06-03 JCB2 - Jun 3, 12:10 UTCJun 3, 14:40 UTC2h 30m
2026-06-03 JCB2 - Jun 3, 08:25 UTCJun 3, 08:50 UTC25m
2026-06-03 JCB2 - Jun 3, 07:25 UTCJun 3, 07:55 UTC30m
2026-05-29 JCB2 - May 29, 12:35 UTCMay 29, 13:20 UTC45m
2026-05-26 JCB2 - May 26, 11:54 UTCMay 26, 12:35 UTC40m

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 M-JCBA page for operator, model, and routing details .

Mode-S 424C79 frequently asked

What is Mode-S code 424C79?
424C79 is an ICAO 24-bit transponder address. Allocated to United Kingdom. Assigned to M-JCBA.
Where is Mode-S 424C79 registered?
Mode-S code 424C79 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 424C79 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 424C79, octal 20446171, decimal 4,344,953.
What flights does 424C79 operate?
Mode-S 424C79 has broadcast 4 distinct callsigns, including JCB2, JCB02, JKY23, GOLD02.