Apparatus

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sensors Mode-S transponder

4CAC16

ICAO 24-bit transponder address · allocated to Ireland

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

Hex
4CAC16
Octal
23126026
Decimal
5,024,790
Country
IE
Tail
EI-KGG
Type
A21N
No current signal · last broadcast 3h ago
Flights observed
95
Distinct callsigns
20
Country
IE
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 4CAC16.

Country allocation

The ICAO 24-bit address 4CAC16 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
KZR646 Air Astana 11 2026-05-25
KZR922 Air Astana 6 2026-04-22
KZR921 Air Astana 6 2026-04-22
KZR564 Air Astana 6 2026-05-26
KZR645 Air Astana 5 2026-05-10
KZR174 Air Astana 5 2026-04-26
KZR157 Air Astana 5 2026-04-29
KZR918 Air Astana 4 2026-05-02
KZR917 Air Astana 4 2026-05-01
KZR911 Air Astana 4 2026-05-24
KZR585 Air Astana 4 2026-05-10
KZR221 Air Astana 3 2026-05-13
KZR193 Air Astana 3 2026-05-17
KZR158 Air Astana 3 2026-05-03
KZR664 Air Astana 2 2026-04-19
KZR604 Air Astana 2 2026-05-28
KZR603 - 2 2026-05-27
KZR586 Air Astana 2 2026-04-17
KZR584 Air Astana 2 2026-05-03
KZR563 Air Astana 2 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 KZR931 ALA → BKK May 29, 06:20 UTCMay 30, 02:00 UTC19h 40m
2026-05-28 KZR563 ALA → HKT May 28, 21:30 UTCMay 29, 07:45 UTC10h 15m
2026-05-28 KZR563 ALA → HKT May 28, 07:35 UTCMay 29, 07:30 UTC23h 55m
2026-05-28 KZR604 HKT → ALA May 28, 06:20 UTCMay 28, 23:05 UTC16h 45m
2026-05-27 KZR604 HKT → ALA May 27, 21:40 UTCMay 28, 21:30 UTC23h 50m
2026-05-27 KZR603 - May 27, 19:45 UTCMay 28, 08:05 UTC12h 20m
2026-05-26 KZR603 - May 26, 23:19 UTCMay 27, 21:30 UTC22h 10m
2026-05-26 KZR564 HKT → ALA May 26, 01:34 UTCMay 26, 23:49 UTC22h 15m
2026-05-25 KZR564 HKT → ALA May 25, 23:35 UTCMay 26, 23:29 UTC23h 55m
2026-05-25 KZR564 HKT → ALA May 25, 22:19 UTCMay 26, 18:14 UTC19h 55m
2026-05-25 KZR564 HKT → ALA May 25, 15:35 UTCMay 26, 10:25 UTC18h 50m
2026-05-25 KZR564 HKT → ALA May 25, 13:35 UTCMay 26, 10:25 UTC20h 50m
2026-05-25 KZR646 PQC → ALA May 25, 11:35 UTCMay 26, 10:25 UTC22h 49m
2026-05-25 KZR646 PQC → ALA May 25, 11:25 UTCMay 26, 09:29 UTC22h 5m
2026-05-25 KZR646 PQC → ALA May 25, 07:35 UTCMay 26, 07:10 UTC23h 34m
2026-05-25 KZR646 PQC → ALA May 25, 03:35 UTCMay 26, 01:44 UTC22h 9m
2026-05-24 KZR646 PQC → ALA May 24, 20:30 UTCMay 25, 16:00 UTC19h 30m
2026-05-24 KZR911 ALA → IST May 24, 16:45 UTCMay 24, 17:00 UTC15m
2026-05-24 KZR911 ALA → IST May 24, 14:45 UTCMay 24, 16:00 UTC1h 15m
2026-05-21 KZR564 HKT → ALA May 21, 21:40 UTCMay 22, 08:15 UTC10h 35m
2026-05-19 KZR8202 - May 19, 08:05 UTCMay 19, 18:30 UTC10h 25m
2026-05-18 KZR235 CIT → JED May 18, 18:20 UTCMay 19, 17:30 UTC23h 9m
2026-05-18 KZR139 ALA → TBS May 18, 16:30 UTCMay 18, 16:50 UTC20m
2026-05-17 KZR193 ALA → CXR May 17, 09:20 UTCMay 17, 23:35 UTC14h 15m
2026-05-17 KZR193 ALA → CXR May 17, 04:15 UTCMay 17, 23:35 UTC19h 20m
2026-05-17 KZR193 ALA → CXR May 17, 01:55 UTCMay 17, 23:35 UTC21h 40m
2026-05-15 KZR934 BKK → ALA May 15, 11:35 UTCMay 15, 15:50 UTC4h 14m
2026-05-14 KZR933 ALA → BKK May 14, 16:55 UTCMay 15, 09:25 UTC16h 30m
2026-05-13 KZR221 ALA → FRA May 13, 19:50 UTCMay 14, 14:40 UTC18h 50m
2026-05-13 KZR911 ALA → IST May 13, 14:40 UTCMay 13, 16:00 UTC1h 20m
2026-05-12 KZR932 BKK → ALA May 12, 03:30 UTCMay 12, 07:50 UTC4h 20m
2026-05-11 KZR646 PQC → ALA May 11, 03:45 UTCMay 11, 22:35 UTC18h 50m
2026-05-11 KZR646 PQC → ALA May 11, 01:34 UTCMay 11, 22:35 UTC21h 0m
2026-05-11 KZR646 PQC → ALA May 11, 00:49 UTCMay 11, 22:35 UTC21h 45m
2026-05-10 KZR645 ALA → PQC May 10, 11:40 UTCMay 11, 11:30 UTC23h 50m
2026-05-10 KZR645 ALA → PQC May 10, 11:10 UTCMay 11, 09:30 UTC22h 20m
2026-05-10 KZR645 ALA → PQC May 10, 09:10 UTCMay 11, 05:05 UTC19h 55m
2026-05-10 KZR645 ALA → PQC May 10, 04:15 UTCMay 11, 03:15 UTC23h 0m
2026-05-10 KZR585 ALA → MLE May 10, 02:10 UTCMay 11, 01:30 UTC23h 20m
2026-05-07 KZR222 FRA → ALA May 7, 16:35 UTCMay 7, 20:40 UTC4h 5m
2026-05-07 KZR221 ALA → FRA May 7, 10:20 UTCMay 7, 14:40 UTC4h 20m
2026-05-06 KZR221 ALA → FRA May 6, 15:35 UTCMay 7, 14:40 UTC23h 5m
2026-05-06 KZR646 PQC → ALA May 6, 13:35 UTCMay 7, 13:30 UTC23h 55m
2026-05-06 KZR646 PQC → ALA May 6, 11:35 UTCMay 7, 11:30 UTC23h 55m
2026-05-06 KZR646 PQC → ALA May 6, 03:45 UTCMay 6, 16:05 UTC12h 20m
2026-05-05 KZR645 ALA → PQC May 5, 11:35 UTCMay 6, 11:30 UTC23h 55m
2026-05-05 KZR141 ALA → TBS May 5, 09:30 UTCMay 5, 10:05 UTC35m
2026-05-04 KZR141 ALA → TBS May 4, 13:55 UTCMay 5, 10:05 UTC20h 11m
2026-05-03 KZR584 SYX → NQZ May 3, 22:15 UTCMay 4, 14:20 UTC16h 5m
2026-05-03 KZR158 CXR → NQZ May 3, 13:25 UTCMay 3, 22:30 UTC9h 5m

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

Mode-S 4CAC16 frequently asked

What is Mode-S code 4CAC16?
4CAC16 is an ICAO 24-bit transponder address. Allocated to Ireland. Assigned to EI-KGG.
Where is Mode-S 4CAC16 registered?
Mode-S code 4CAC16 is allocated to Ireland (IE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4CAC16 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4CAC16, octal 23126026, decimal 5,024,790.
What flights does 4CAC16 operate?
Mode-S 4CAC16 has broadcast 20 distinct callsigns, including KZR646, KZR922, KZR921, KZR564, KZR645.