Apparatus

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sensors Mode-S transponder

4CAC04

ICAO 24-bit transponder address · allocated to Ireland

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

Hex
4CAC04
Octal
23126004
Decimal
5,024,772
Country
IE
Tail
EI-KBK
Type
A20N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
99
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 4CAC04.

Country allocation

The ICAO 24-bit address 4CAC04 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
KZR142 - 9 2026-07-23
KZR938 Air Astana 7 2026-05-27
KZR937 Air Astana 7 2026-05-26
KZR141 - 7 2026-07-23
KZR301 - 6 2026-07-05
KZR267 Air Astana 5 2026-07-26
KZR140 Air Astana 5 2026-06-30
KZR139 - 5 2026-07-15
KZR345 Air Astana 4 2026-05-23
KZR292 Air Astana 4 2026-07-26
KZR291 Air Astana 4 2026-07-25
KZR870 Air Astana 3 2026-07-21
KZR613 - 3 2026-07-12
KZR346 Air Astana 3 2026-05-28
KZR336 Air Astana 3 2026-05-24
KZR911 Air Astana 2 2026-07-16
KZR869 Air Astana 2 2026-07-21
KZR304 Air Astana 2 2026-06-28
KZR302 Air Astana 2 2026-06-09
KZR268 Air Astana 2 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KZR268 PEK → ALA Jul 26, 22:25 UTCJul 26, 22:45 UTC20m
2026-07-26 KZR267 ALA → PEK Jul 26, 20:05 UTCJul 26, 20:25 UTC20m
2026-07-26 KZR292 BOM → ALA Jul 26, 00:30 UTCJul 26, 02:15 UTC1h 45m
2026-07-25 KZR291 ALA → BOM Jul 25, 21:10 UTCJul 25, 23:10 UTC2h 0m
2026-07-24 KZR268 - Jul 24, 22:05 UTCJul 24, 22:25 UTC20m
2026-07-24 KZR267 - Jul 24, 20:10 UTCJul 24, 20:25 UTC15m
2026-07-24 KZR8238 DEL → ALA Jul 24, 02:35 UTCJul 24, 03:15 UTC40m
2026-07-23 KZR142 TBS → DEL Jul 23, 10:00 UTCJul 24, 01:00 UTC15h 0m
2026-07-23 KZR141 - Jul 23, 07:40 UTCJul 23, 08:10 UTC30m
2026-07-21 KZR870 IST → GUW Jul 21, 10:55 UTCJul 21, 12:55 UTC2h 0m
2026-07-21 KZR869 GUW → IST Jul 21, 05:45 UTCJul 21, 08:05 UTC2h 20m
2026-07-18 KZR142 - Jul 18, 10:45 UTCJul 18, 11:10 UTC25m
2026-07-17 KZR141 - Jul 17, 22:15 UTCJul 18, 09:25 UTC11h 11m
2026-07-17 KZR267 - Jul 17, 20:20 UTCJul 17, 20:35 UTC15m
2026-07-16 KZR912 - Jul 16, 18:59 UTCJul 16, 21:00 UTC2h 0m
2026-07-16 KZR911 ALA → IST Jul 16, 14:50 UTCJul 16, 17:20 UTC2h 30m
2026-07-15 KZR911 ALA → IST Jul 15, 18:25 UTCJul 16, 17:00 UTC22h 35m
2026-07-15 KZR139 - Jul 15, 16:25 UTCJul 15, 17:00 UTC35m
2026-07-13 KZR908 - Jul 13, 06:40 UTCJul 13, 07:30 UTC50m
2026-07-12 KZR614 - Jul 12, 09:25 UTCJul 13, 04:45 UTC19h 20m
2026-07-12 KZR613 - Jul 12, 07:35 UTCJul 12, 07:50 UTC15m
2026-07-11 KZR613 - Jul 11, 11:15 UTCJul 12, 06:50 UTC19h 35m
2026-07-11 KZR613 - Jul 11, 09:05 UTCJul 12, 06:50 UTC21h 45m
2026-07-10 KZR142 - Jul 10, 14:50 UTCJul 11, 07:25 UTC16h 35m
2026-07-10 KZR141 - Jul 10, 13:05 UTCJul 10, 13:35 UTC30m
2026-07-09 KZR142 - Jul 9, 09:50 UTCJul 9, 10:15 UTC25m
2026-07-09 KZR141 - Jul 9, 07:40 UTCJul 9, 08:15 UTC35m
2026-07-07 KZR870 IST → GUW Jul 7, 10:55 UTCJul 7, 12:50 UTC1h 55m
2026-07-06 KZR292 - Jul 6, 01:35 UTCJul 6, 03:25 UTC1h 50m
2026-07-05 KZR291 - Jul 5, 08:55 UTCJul 5, 23:55 UTC15h 0m
2026-07-05 KZR301 - Jul 5, 07:05 UTCJul 5, 07:25 UTC20m
2026-07-04 KZR301 - Jul 4, 11:05 UTCJul 5, 07:25 UTC20h 20m
2026-07-04 KZR142 - Jul 4, 10:45 UTCJul 5, 07:25 UTC20h 40m
2026-07-03 KZR141 - Jul 3, 22:25 UTCJul 4, 09:05 UTC10h 40m
2026-07-03 KZR267 - Jul 3, 20:20 UTCJul 3, 20:35 UTC15m
2026-07-02 KZR142 - Jul 2, 09:40 UTCJul 2, 10:10 UTC30m
2026-07-02 KZR141 - Jul 2, 07:45 UTCJul 2, 08:25 UTC40m
2026-06-30 KZR140 TBS → ALA Jun 30, 18:55 UTCJun 30, 19:25 UTC30m
2026-06-30 KZR139 ALA → TBS Jun 30, 17:05 UTCJun 30, 17:45 UTC40m
2026-06-29 KZR140 TBS → ALA Jun 29, 18:39 UTCJun 29, 19:09 UTC30m
2026-06-29 KZR139 ALA → TBS Jun 29, 16:59 UTCJun 29, 17:30 UTC30m
2026-06-28 KZR304 UKK → ALA Jun 28, 17:44 UTCJun 29, 16:59 UTC23h 15m
2026-06-28 KZR303 ALA → UKK Jun 28, 16:09 UTCJun 28, 16:35 UTC25m
2026-06-26 KZR304 UKK → ALA Jun 26, 16:54 UTCJun 26, 17:19 UTC25m
2026-06-25 KZR140 TBS → ALA Jun 25, 19:05 UTCJun 26, 15:34 UTC20h 30m
2026-06-25 KZR140 TBS → ALA Jun 25, 18:55 UTCJun 26, 15:34 UTC20h 40m
2026-06-25 KZR139 ALA → TBS Jun 25, 16:39 UTCJun 25, 17:20 UTC40m
2026-06-24 KZR142 - Jun 24, 10:55 UTCJun 24, 11:20 UTC25m
2026-06-23 KZR142 - Jun 23, 22:15 UTCJun 24, 09:24 UTC11h 10m
2026-06-23 KZR267 ALA → PEK Jun 23, 20:15 UTCJun 23, 20:34 UTC20m

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

Mode-S 4CAC04 frequently asked

What is Mode-S code 4CAC04?
4CAC04 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KBK.
Where is Mode-S 4CAC04 registered?
Mode-S code 4CAC04 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC04 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC04, octal 23126004, decimal 5,024,772.
What flights does 4CAC04 operate?
Mode-S 4CAC04 has broadcast 20 distinct callsigns, including KZR142, KZR938, KZR937, KZR141, KZR301.