Apparatus

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sensors Mode-S transponder

4CAC03

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-KBJ · AIRBUS A-320neo

Hex
4CAC03
Octal
23126003
Decimal
5,024,771
Country
IE
Tail
EI-KBJ
Type
A20N
No current signal · last broadcast 8d ago
Flights observed
96
Distinct callsigns
20
Country
IE
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S 4CAC03.

Country allocation

The ICAO 24-bit address 4CAC03 falls within the block assigned to Ireland (IE) by ICAO Annex 10, Volume III. Every aircraft registered in Ireland 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 20 distinct

Callsign Airline Flights Last seen
KZR139 - 7 2026-07-04
KZR963 - 6 2026-07-10
KZR140 Air Astana 6 2026-07-03
KZR964 - 5 2026-07-10
KZR907 Air Astana 5 2026-07-24
KZR141 - 5 2026-07-22
KZR908 Air Astana 4 2026-07-24
KZR613 - 4 2026-07-05
KZR301 - 4 2026-07-14
KZR268 - 4 2026-07-12
KZR142 - 4 2026-07-06
KZR869 - 3 2026-06-30
KZR336 Air Astana 3 2026-05-19
KZR302 Air Astana 3 2026-05-22
KZR292 - 3 2026-07-20
KZR291 - 3 2026-07-19
KZR267 - 3 2026-06-28
KZR925 - 2 2026-07-15
KZR913 - 2 2026-07-17
KZR870 Air Astana 2 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 KZR908 DEL → ALA Jul 24, 06:35 UTCJul 24, 07:15 UTC40m
2026-07-24 KZR907 ALA → DEL Jul 24, 04:00 UTCJul 24, 04:50 UTC50m
2026-07-22 KZR141 - Jul 22, 11:30 UTCJul 22, 11:35 UTC5m
2026-07-21 KZR908 - Jul 21, 06:35 UTCJul 21, 07:25 UTC50m
2026-07-21 KZR907 ALA → DEL Jul 21, 04:05 UTCJul 21, 05:10 UTC1h 5m
2026-07-20 KZR907 ALA → DEL Jul 20, 08:55 UTCJul 21, 05:10 UTC20h 14m
2026-07-20 KZR292 - Jul 20, 00:50 UTCJul 20, 07:35 UTC6h 45m
2026-07-19 KZR291 - Jul 19, 22:55 UTCJul 19, 23:10 UTC15m
2026-07-19 KZR291 - Jul 19, 21:15 UTCJul 19, 22:10 UTC55m
2026-07-17 KZR914 - Jul 17, 09:15 UTCJul 17, 11:15 UTC2h 0m
2026-07-17 KZR913 - Jul 17, 05:20 UTCJul 17, 07:40 UTC2h 20m
2026-07-16 KZR913 - Jul 16, 10:50 UTCJul 17, 07:40 UTC20h 50m
2026-07-16 KZR345 - Jul 16, 08:55 UTCJul 16, 09:20 UTC25m
2026-07-15 KZR345 - Jul 15, 10:50 UTCJul 16, 09:20 UTC22h 30m
2026-07-15 KZR926 - Jul 15, 09:25 UTCJul 15, 11:10 UTC1h 45m
2026-07-15 KZR925 - Jul 15, 05:25 UTCJul 15, 07:55 UTC2h 30m
2026-07-14 KZR925 - Jul 14, 09:10 UTCJul 15, 07:55 UTC22h 44m
2026-07-14 KZR301 - Jul 14, 07:15 UTCJul 14, 07:35 UTC20m
2026-07-12 KZR268 - Jul 12, 22:20 UTCJul 12, 22:45 UTC25m
2026-07-12 KZR292 - Jul 12, 00:55 UTCJul 12, 20:35 UTC19h 40m
2026-07-12 KZR292 - Jul 12, 00:30 UTCJul 12, 20:35 UTC20h 5m
2026-07-11 KZR291 - Jul 11, 20:55 UTCJul 11, 22:55 UTC2h 0m
2026-07-10 KZR964 - Jul 10, 19:45 UTCJul 10, 20:20 UTC35m
2026-07-10 KZR963 - Jul 10, 17:35 UTCJul 10, 18:20 UTC45m
2026-07-07 KZR964 - Jul 7, 19:45 UTCJul 7, 20:25 UTC40m
2026-07-07 KZR963 - Jul 7, 17:35 UTCJul 7, 18:25 UTC50m
2026-07-06 KZR142 - Jul 6, 17:30 UTCJul 6, 18:00 UTC30m
2026-07-06 KZR141 - Jul 6, 13:55 UTCJul 6, 14:25 UTC30m
2026-07-05 KZR614 - Jul 5, 09:40 UTCJul 5, 11:35 UTC1h 55m
2026-07-05 KZR613 - Jul 5, 07:40 UTCJul 5, 08:05 UTC25m
2026-07-04 KZR613 - Jul 4, 18:30 UTCJul 5, 07:05 UTC12h 35m
2026-07-04 KZR139 - Jul 4, 09:00 UTCJul 4, 17:25 UTC8h 25m
2026-07-03 KZR140 TBS → ALA Jul 3, 18:30 UTCJul 4, 07:35 UTC13h 5m
2026-07-03 KZR139 - Jul 3, 16:45 UTCJul 3, 17:15 UTC30m
2026-06-30 KZR870 IST → GUW Jun 30, 11:05 UTCJun 30, 13:05 UTC2h 0m
2026-06-30 KZR869 - Jun 30, 07:55 UTCJun 30, 08:10 UTC15m
2026-06-30 KZR869 - Jun 30, 05:50 UTCJun 30, 07:10 UTC1h 20m
2026-06-28 KZR268 - Jun 28, 22:49 UTCJun 28, 23:09 UTC20m
2026-06-28 KZR267 - Jun 28, 20:39 UTCJun 28, 20:54 UTC15m
2026-06-28 KZR614 - Jun 28, 09:45 UTCJun 28, 11:50 UTC2h 5m
2026-06-28 KZR613 - Jun 28, 05:40 UTCJun 28, 08:05 UTC2h 25m
2026-06-27 KZR613 - Jun 27, 09:09 UTCJun 28, 08:05 UTC22h 55m
2026-06-27 KZR169 ALA → BUS Jun 27, 05:19 UTCJun 27, 05:59 UTC40m
2026-06-27 KZR169 ALA → BUS Jun 27, 02:04 UTCJun 27, 04:05 UTC2h 0m
2026-06-24 KZR908 - Jun 24, 06:45 UTCJun 24, 07:24 UTC40m
2026-06-24 KZR907 - Jun 24, 04:05 UTCJun 24, 04:55 UTC50m
2026-06-22 KZR142 TBS → ALA Jun 22, 15:54 UTCJun 22, 16:50 UTC55m
2026-06-22 KZR141 - Jun 22, 14:10 UTCJun 22, 14:45 UTC35m
2026-06-20 KZR140 TBS → ALA Jun 20, 18:54 UTCJun 20, 19:24 UTC30m
2026-06-20 KZR139 ALA → TBS Jun 20, 16:49 UTCJun 20, 17:29 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 EI-KBJ page for operator, model, and routing details .

Mode-S 4CAC03 frequently asked

What is Mode-S code 4CAC03?
4CAC03 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KBJ.
Where is Mode-S 4CAC03 registered?
Mode-S code 4CAC03 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC03 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 4CAC03, octal 23126003, decimal 5,024,771.
What flights does 4CAC03 operate?
Mode-S 4CAC03 has broadcast 20 distinct callsigns, including KZR139, KZR963, KZR140, KZR964, KZR907.