Apparatus

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sensors Mode-S transponder

4CAC0B

ICAO 24-bit transponder address · allocated to Ireland

Currently assigned to EI-KDD · AIRBUS A-321neo

Hex
4CAC0B
Octal
23126013
Decimal
5,024,779
Country
IE
Tail
EI-KDD
Type
A21N
No current signal · last broadcast 1d ago
Flights observed
59
Distinct callsigns
20
Country
IE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4CAC0B.

Country allocation

The ICAO 24-bit address 4CAC0B 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 Air Astana 8 2026-05-20
KZR140 Air Astana 7 2026-05-20
KZR963 Air Astana 6 2026-05-25
KZR915 Air Astana 6 2026-05-17
KZR292 Air Astana 4 2026-05-29
KZR291 Air Astana 4 2026-05-28
KZR964 Air Astana 3 2026-05-25
KZR558 Air Astana 3 2026-04-14
KZR916 Air Astana 2 2026-05-15
KZR859 Air Astana 2 2026-05-11
KZR8210 Air Astana 2 2026-05-18
KZR557 - 2 2026-04-14
KZR215 Air Astana 2 2026-05-08
KZR982 Air Astana 1 2026-05-10
KZR908 Air Astana 1 2026-04-30
KZR907 Air Astana 1 2026-04-30
KZR314 Air Astana 1 2026-05-10
KZR268 Air Astana 1 2026-04-18
KZR267 - 1 2026-04-18
KZR237 Air Astana 1 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 KZR292 BOM → ALA May 29, 00:30 UTCMay 29, 02:25 UTC1h 55m
2026-05-28 KZR291 ALA → BOM May 28, 21:10 UTCMay 28, 23:10 UTC2h 0m
2026-05-25 KZR964 DEL → ALA May 25, 20:15 UTCMay 25, 20:55 UTC40m
2026-05-25 KZR963 ALA → DEL May 25, 01:55 UTCMay 25, 18:30 UTC16h 35m
2026-05-24 KZR291 ALA → BOM May 24, 20:55 UTCMay 24, 21:40 UTC45m
2026-05-20 KZR140 TBS → ALA May 20, 18:25 UTCMay 20, 19:00 UTC35m
2026-05-20 KZR139 ALA → TBS May 20, 06:55 UTCMay 20, 17:10 UTC10h 15m
2026-05-19 KZR964 DEL → ALA May 19, 20:35 UTCMay 20, 05:05 UTC8h 31m
2026-05-19 KZR963 ALA → DEL May 19, 18:10 UTCMay 19, 18:50 UTC40m
2026-05-18 KZR963 ALA → DEL May 18, 20:50 UTCMay 19, 18:50 UTC22h 0m
2026-05-18 KZR8210 MED → ALA May 18, 18:50 UTCMay 19, 18:45 UTC23h 55m
2026-05-18 KZR8210 MED → ALA May 18, 07:25 UTCMay 18, 21:10 UTC13h 44m
2026-05-17 KZR237 CIT → MED May 17, 10:50 UTCMay 18, 10:35 UTC23h 45m
2026-05-17 KZR915 ALA → AYT May 17, 08:50 UTCMay 17, 09:00 UTC10m
2026-05-16 KZR915 ALA → AYT May 16, 19:55 UTCMay 17, 08:00 UTC12h 5m
2026-05-16 KZR963 ALA → DEL May 16, 17:45 UTCMay 16, 18:20 UTC35m
2026-05-15 KZR963 ALA → DEL May 15, 20:20 UTCMay 16, 18:20 UTC22h 1m
2026-05-15 KZR916 AYT → ALA May 15, 11:00 UTCMay 15, 20:25 UTC9h 24m
2026-05-15 KZR915 ALA → AYT May 15, 09:10 UTCMay 15, 09:30 UTC20m
2026-05-15 KZR915 ALA → AYT May 15, 07:05 UTCMay 15, 08:10 UTC1h 5m
2026-05-12 KZR140 TBS → ALA May 12, 18:40 UTCMay 12, 19:10 UTC30m
2026-05-12 KZR139 ALA → TBS May 12, 16:40 UTCMay 12, 17:10 UTC30m
2026-05-11 KZR139 ALA → TBS May 11, 20:20 UTCMay 12, 17:10 UTC20h 50m
2026-05-11 KZR859 ALA → SCO May 11, 18:30 UTCMay 11, 18:45 UTC15m
2026-05-10 KZR859 ALA → SCO May 10, 18:49 UTCMay 11, 18:45 UTC23h 56m
2026-05-10 KZR314 SCO → NQZ May 10, 18:35 UTCMay 10, 18:49 UTC15m
2026-05-10 KZR982 GUW → NQZ May 10, 02:00 UTCMay 10, 02:10 UTC10m
2026-05-08 KZR216 AYT → NQZ May 8, 08:49 UTCMay 8, 10:49 UTC2h 0m
2026-05-08 KZR215 NQZ → AYT May 8, 07:14 UTCMay 8, 07:29 UTC15m
2026-05-08 KZR215 NQZ → AYT May 8, 05:24 UTCMay 8, 05:54 UTC30m
2026-05-05 KZR292 BOM → ALA May 5, 12:05 UTCMay 6, 02:30 UTC14h 25m
2026-05-05 KZR916 AYT → ALA May 5, 11:05 UTCMay 5, 11:15 UTC10m
2026-05-05 KZR915 ALA → AYT May 5, 09:05 UTCMay 5, 09:30 UTC25m
2026-05-05 KZR915 ALA → AYT May 5, 07:10 UTCMay 5, 08:30 UTC1h 20m
2026-05-03 KZR292 BOM → ALA May 3, 01:30 UTCMay 3, 02:15 UTC45m
2026-05-03 KZR292 BOM → ALA May 3, 00:30 UTCMay 3, 00:40 UTC10m
2026-05-02 KZR291 ALA → BOM May 2, 22:45 UTCMay 2, 23:00 UTC15m
2026-05-02 KZR291 ALA → BOM May 2, 21:00 UTCMay 2, 22:00 UTC1h 0m
2026-05-01 KZR140 TBS → ALA May 1, 18:45 UTCMay 1, 19:15 UTC30m
2026-05-01 KZR139 ALA → TBS May 1, 16:30 UTCMay 1, 17:05 UTC35m
2026-04-30 KZR139 ALA → TBS Apr 30, 18:55 UTCMay 1, 17:05 UTC22h 10m
2026-04-30 KZR908 DEL → ALA Apr 30, 06:40 UTCApr 30, 17:30 UTC10h 50m
2026-04-30 KZR907 ALA → DEL Apr 30, 04:05 UTCApr 30, 04:50 UTC45m
2026-04-27 KZR964 DEL → ALA Apr 27, 20:15 UTCApr 27, 21:00 UTC45m
2026-04-27 KZR963 ALA → DEL Apr 27, 18:10 UTCApr 27, 18:35 UTC25m
2026-04-26 KZR140 TBS → ALA Apr 26, 19:05 UTCApr 26, 19:35 UTC30m
2026-04-26 KZR139 ALA → TBS Apr 26, 17:00 UTCApr 26, 17:30 UTC30m
2026-04-21 KZR140 TBS → ALA Apr 21, 18:35 UTCApr 21, 19:05 UTC30m
2026-04-21 KZR139 ALA → TBS Apr 21, 16:40 UTCApr 21, 17:20 UTC40m
2026-04-18 KZR268 PEK → ALA Apr 18, 22:30 UTCApr 18, 22:45 UTC15m

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

Mode-S 4CAC0B frequently asked

What is Mode-S code 4CAC0B?
4CAC0B is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KDD.
Where is Mode-S 4CAC0B registered?
Mode-S code 4CAC0B is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC0B broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC0B, octal 23126013, decimal 5,024,779.
What flights does 4CAC0B operate?
Mode-S 4CAC0B has broadcast 20 distinct callsigns, including KZR139, KZR140, KZR963, KZR915, KZR292.