Apparatus

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sensors Mode-S transponder

4CAEF1

ICAO 24-bit transponder address · allocated to Ireland

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

Hex
4CAEF1
Octal
23127361
Decimal
5,025,521
Country
IE
Tail
EI-KIE
Type
A20N
No current signal · last broadcast 1d ago
Flights observed
75
Distinct callsigns
18
Country
IE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4CAEF1.

Country allocation

The ICAO 24-bit address 4CAEF1 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 18 distinct

Callsign Airline Flights Last seen
KZR345 - 28 2026-07-08
KZR346 - 20 2026-07-08
KZR662 Air Astana 4 2026-06-27
KZR869 Air Astana 3 2026-05-19
KZR661 Air Astana 3 2026-06-27
KZR938 Air Astana 2 2026-06-17
KZR937 Air Astana 2 2026-06-17
KZR227 - 2 2026-07-02
KZR205 - 2 2026-07-04
KZR964 - 1 2026-07-12
KZR963 - 1 2026-07-12
KZR870 Air Astana 1 2026-05-19
KZR8370 - 1 2026-07-10
KZR8369 - 1 2026-07-09
KZR304 Air Astana 1 2026-07-10
KZR228 - 1 2026-07-02
KZR206 - 1 2026-07-04
KZR139 - 1 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 KZR964 - Jul 12, 19:55 UTCJul 12, 20:35 UTC40m
2026-07-12 KZR963 - Jul 12, 17:40 UTCJul 12, 18:30 UTC50m
2026-07-10 KZR304 UKK → ALA Jul 10, 16:50 UTCJul 10, 17:15 UTC25m
2026-07-10 KZR8370 - Jul 10, 06:50 UTCJul 10, 15:20 UTC8h 30m
2026-07-09 KZR8369 TBS → BUS Jul 9, 18:25 UTCJul 10, 05:30 UTC11h 5m
2026-07-09 KZR139 - Jul 9, 16:35 UTCJul 9, 17:15 UTC40m
2026-07-08 KZR346 - Jul 8, 10:40 UTCJul 8, 11:05 UTC25m
2026-07-08 KZR345 - Jul 8, 08:40 UTCJul 8, 09:05 UTC25m
2026-07-06 KZR346 - Jul 6, 10:40 UTCJul 6, 11:10 UTC30m
2026-07-06 KZR345 - Jul 6, 08:45 UTCJul 6, 09:05 UTC20m
2026-07-05 KZR346 - Jul 5, 10:30 UTCJul 6, 09:05 UTC22h 35m
2026-07-05 KZR345 - Jul 5, 08:35 UTCJul 5, 09:00 UTC25m
2026-07-04 KZR345 - Jul 4, 11:05 UTCJul 5, 09:00 UTC21h 55m
2026-07-04 KZR206 - Jul 4, 09:00 UTCJul 4, 11:10 UTC2h 10m
2026-07-04 KZR205 - Jul 4, 04:55 UTCJul 4, 07:20 UTC2h 25m
2026-07-03 KZR205 - Jul 3, 10:35 UTCJul 4, 07:20 UTC20h 45m
2026-07-02 KZR228 - Jul 2, 17:45 UTCJul 3, 09:10 UTC15h 25m
2026-07-02 KZR227 - Jul 2, 15:35 UTCJul 2, 15:55 UTC20m
2026-07-02 KZR227 - Jul 2, 12:00 UTCJul 2, 12:20 UTC20m
2026-07-01 KZR346 - Jul 1, 10:30 UTCJul 1, 11:05 UTC35m
2026-07-01 KZR345 - Jul 1, 08:45 UTCJul 1, 09:10 UTC25m
2026-06-30 KZR346 - Jun 30, 10:35 UTCJul 1, 09:10 UTC22h 35m
2026-06-30 KZR345 - Jun 30, 08:40 UTCJun 30, 09:00 UTC20m
2026-06-28 KZR346 - Jun 28, 10:35 UTCJun 28, 11:00 UTC25m
2026-06-27 KZR662 BJV → NQZ Jun 27, 14:20 UTCJun 28, 09:05 UTC18h 45m
2026-06-27 KZR662 BJV → NQZ Jun 27, 12:55 UTCJun 28, 09:05 UTC20h 10m
2026-06-27 KZR661 NQZ → BJV Jun 27, 08:44 UTCJun 27, 11:25 UTC2h 40m
2026-06-26 KZR661 NQZ → BJV Jun 26, 10:44 UTCJun 27, 10:14 UTC23h 30m
2026-06-26 KZR345 - Jun 26, 08:45 UTCJun 26, 09:10 UTC25m
2026-06-24 KZR346 - Jun 24, 10:30 UTCJun 24, 10:55 UTC25m
2026-06-24 KZR345 - Jun 24, 08:39 UTCJun 24, 09:05 UTC25m
2026-06-23 KZR346 - Jun 23, 10:29 UTCJun 24, 09:05 UTC22h 35m
2026-06-23 KZR345 - Jun 23, 08:35 UTCJun 23, 08:59 UTC25m
2026-06-22 KZR345 - Jun 22, 10:49 UTCJun 23, 08:59 UTC22h 10m
2026-06-22 KZR345 - Jun 22, 08:54 UTCJun 22, 09:19 UTC25m
2026-06-21 KZR345 - Jun 21, 10:44 UTCJun 22, 09:19 UTC22h 35m
2026-06-21 KZR345 - Jun 21, 08:40 UTCJun 21, 09:10 UTC30m
2026-06-20 KZR346 - Jun 20, 10:49 UTCJun 21, 09:10 UTC22h 20m
2026-06-20 KZR345 - Jun 20, 08:49 UTCJun 20, 09:14 UTC25m
2026-06-19 KZR346 - Jun 19, 10:44 UTCJun 20, 09:14 UTC22h 30m
2026-06-19 KZR345 - Jun 19, 08:44 UTCJun 19, 09:09 UTC25m
2026-06-18 KZR346 - Jun 18, 10:45 UTCJun 19, 09:09 UTC22h 24m
2026-06-17 KZR938 FRA → URA Jun 17, 14:20 UTCJun 18, 09:15 UTC18h 55m
2026-06-17 KZR938 FRA → URA Jun 17, 13:05 UTCJun 18, 09:15 UTC20h 10m
2026-06-17 KZR937 URA → FRA Jun 17, 06:25 UTCJun 17, 11:05 UTC4h 40m
2026-06-16 KZR937 URA → FRA Jun 16, 10:30 UTCJun 17, 10:15 UTC23h 46m
2026-06-16 KZR345 NQZ → UKK Jun 16, 08:44 UTCJun 16, 09:04 UTC20m
2026-06-15 KZR346 UKK → NQZ Jun 15, 10:35 UTCJun 16, 09:04 UTC22h 30m
2026-06-15 KZR345 NQZ → UKK Jun 15, 08:45 UTCJun 15, 09:10 UTC25m
2026-06-14 KZR346 UKK → NQZ Jun 14, 10:40 UTCJun 15, 09:10 UTC22h 30m

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

Mode-S 4CAEF1 frequently asked

What is Mode-S code 4CAEF1?
4CAEF1 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KIE.
Where is Mode-S 4CAEF1 registered?
Mode-S code 4CAEF1 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAEF1 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 4CAEF1, octal 23127361, decimal 5,025,521.
What flights does 4CAEF1 operate?
Mode-S 4CAEF1 has broadcast 18 distinct callsigns, including KZR345, KZR346, KZR662, KZR869, KZR661.