Apparatus

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sensors Mode-S transponder

4CAC15

ICAO 24-bit transponder address · allocated to Ireland

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

Hex
4CAC15
Octal
23126025
Decimal
5,024,789
Country
IE
Tail
EI-KGF
Type
A21N
No current signal · last broadcast 13d ago
Flights observed
179
Distinct callsigns
20
Country
IE
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S 4CAC15.

Country allocation

The ICAO 24-bit address 4CAC15 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
KZR663 - 28 2026-07-20
KZR221 - 14 2026-07-22
KZR917 Air Astana 13 2026-06-02
KZR931 - 10 2026-07-01
KZR664 - 10 2026-07-21
KZR921 Air Astana 9 2026-05-19
KZR563 - 9 2026-07-02
KZR911 Air Astana 8 2026-07-25
KZR222 - 7 2026-07-23
KZR604 - 6 2026-07-09
KZR157 Air Astana 6 2026-05-27
KZR932 - 5 2026-06-25
KZR918 Air Astana 4 2026-06-02
KZR556 - 4 2026-06-23
KZR199 - 4 2026-06-01
KZR636 Air Astana 3 2026-06-19
KZR635 Air Astana 3 2026-06-16
KZR564 - 3 2026-07-03
KZR200 - 3 2026-06-01
KZR922 Air Astana 2 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KZR614 IST → ALA Jul 26, 09:25 UTCJul 26, 11:20 UTC1h 55m
2026-07-26 KZR613 ALA → IST Jul 26, 07:30 UTCJul 26, 07:45 UTC15m
2026-07-25 KZR613 ALA → IST Jul 25, 18:50 UTCJul 26, 06:55 UTC12h 6m
2026-07-25 KZR911 ALA → IST Jul 25, 16:50 UTCJul 25, 17:10 UTC20m
2026-07-24 KZR911 ALA → IST Jul 24, 22:00 UTCJul 25, 16:15 UTC18h 15m
2026-07-24 KZR914 - Jul 24, 09:30 UTCJul 24, 22:10 UTC12h 40m
2026-07-23 KZR222 - Jul 23, 16:45 UTCJul 24, 08:00 UTC15h 15m
2026-07-22 KZR221 - Jul 22, 22:25 UTCJul 23, 14:40 UTC16h 15m
2026-07-22 KZR267 - Jul 22, 20:25 UTCJul 22, 20:45 UTC20m
2026-07-21 KZR664 - Jul 21, 17:25 UTCJul 21, 21:55 UTC4h 30m
2026-07-20 KZR663 - Jul 20, 21:20 UTCJul 21, 15:45 UTC18h 24m
2026-07-20 KZR663 - Jul 20, 19:30 UTCJul 21, 15:45 UTC20h 14m
2026-07-20 KZR911 ALA → IST Jul 20, 17:20 UTCJul 20, 17:35 UTC15m
2026-07-19 KZR911 ALA → IST Jul 19, 21:55 UTCJul 20, 16:40 UTC18h 45m
2026-07-19 KZR8004 LCA → ALA Jul 19, 10:05 UTCJul 20, 04:20 UTC18h 15m
2026-07-18 KZR222 FRA → LCA Jul 18, 17:35 UTCJul 19, 08:20 UTC14h 45m
2026-07-17 KZR221 - Jul 17, 22:00 UTCJul 18, 15:45 UTC17h 46m
2026-07-17 KZR221 - Jul 17, 16:44 UTCJul 18, 15:15 UTC22h 31m
2026-07-15 KZR898 - Jul 15, 10:25 UTCJul 15, 23:30 UTC13h 5m
2026-07-14 KZR664 - Jul 14, 17:45 UTCJul 15, 08:25 UTC14h 39m
2026-07-14 KZR663 - Jul 14, 09:50 UTCJul 14, 15:30 UTC5h 40m
2026-07-13 KZR663 - Jul 13, 15:20 UTCJul 14, 15:15 UTC23h 55m
2026-07-13 KZR663 - Jul 13, 13:20 UTCJul 14, 13:15 UTC23h 55m
2026-07-13 KZR2204 - Jul 13, 12:40 UTCJul 14, 11:15 UTC22h 35m
2026-07-12 KZR664 - Jul 12, 17:35 UTCJul 13, 10:45 UTC17h 10m
2026-07-11 KZR663 - Jul 11, 19:20 UTCJul 12, 15:35 UTC20h 15m
2026-07-11 KZR663 - Jul 11, 17:20 UTCJul 12, 15:35 UTC22h 15m
2026-07-11 KZR221 - Jul 11, 10:40 UTCJul 11, 15:25 UTC4h 45m
2026-07-10 KZR599 - Jul 10, 00:15 UTCJul 10, 05:50 UTC5h 35m
2026-07-09 KZR604 - Jul 9, 09:20 UTCJul 10, 05:50 UTC20h 30m
2026-07-09 KZR604 - Jul 9, 07:20 UTCJul 10, 05:50 UTC22h 30m
2026-07-09 KZR604 - Jul 9, 06:00 UTCJul 10, 00:30 UTC18h 30m
2026-07-08 KZR604 - Jul 8, 23:30 UTCJul 9, 10:05 UTC10h 35m
2026-07-08 KZR604 - Jul 8, 12:25 UTCJul 9, 10:05 UTC21h 40m
2026-07-08 KZR604 - Jul 8, 10:15 UTCJul 9, 09:15 UTC23h 0m
2026-07-08 KZR897 - Jul 8, 08:30 UTCJul 8, 08:40 UTC10m
2026-07-07 KZR664 - Jul 7, 17:30 UTCJul 8, 06:25 UTC12h 55m
2026-07-07 KZR663 - Jul 7, 09:55 UTCJul 7, 15:40 UTC5h 45m
2026-07-06 KZR663 - Jul 6, 19:20 UTCJul 7, 15:40 UTC20h 20m
2026-07-06 KZR663 - Jul 6, 17:20 UTCJul 7, 15:40 UTC22h 20m
2026-07-06 KZR663 - Jul 6, 16:55 UTCJul 7, 15:15 UTC22h 20m
2026-07-06 KZR221 - Jul 6, 00:15 UTCJul 6, 14:45 UTC14h 30m
2026-07-05 KZR221 - Jul 5, 18:05 UTCJul 6, 14:45 UTC20h 40m
2026-07-03 KZR564 - Jul 3, 04:30 UTCJul 3, 22:25 UTC17h 55m
2026-07-03 KZR564 - Jul 3, 01:20 UTCJul 3, 22:25 UTC21h 5m
2026-07-02 KZR563 - Jul 2, 23:20 UTCJul 3, 22:25 UTC23h 5m
2026-07-02 KZR563 - Jul 2, 21:55 UTCJul 3, 17:05 UTC19h 10m
2026-07-02 KZR563 - Jul 2, 05:20 UTCJul 3, 05:15 UTC23h 55m
2026-07-02 KZR563 - Jul 2, 04:10 UTCJul 3, 02:05 UTC21h 55m
2026-07-01 KZR931 - Jul 1, 07:25 UTCJul 2, 02:25 UTC19h 0m

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

Mode-S 4CAC15 frequently asked

What is Mode-S code 4CAC15?
4CAC15 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KGF.
Where is Mode-S 4CAC15 registered?
Mode-S code 4CAC15 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC15 broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC15, octal 23126025, decimal 5,024,789.
What flights does 4CAC15 operate?
Mode-S 4CAC15 has broadcast 20 distinct callsigns, including KZR663, KZR221, KZR917, KZR931, KZR664.