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 Jul 26, 21:10 UTC
Flights observed
214
Distinct callsigns
20
Country
IE
Last broadcast
Jul 26, 21:10 UTC

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
KZR911 Air Astana 17 2026-07-22
KZR194 - 14 2026-07-07
KZR564 - 13 2026-07-12
KZR663 - 12 2026-07-18
KZR646 Air Astana 11 2026-05-25
KZR563 - 11 2026-07-11
KZR221 - 11 2026-07-12
KZR604 - 8 2026-07-16
KZR222 - 8 2026-07-13
KZR922 Air Astana 6 2026-04-22
KZR921 Air Astana 6 2026-04-22
KZR912 - 6 2026-07-22
KZR664 - 6 2026-07-19
KZR603 - 6 2026-07-15
KZR931 - 5 2026-06-27
KZR645 Air Astana 5 2026-05-10
KZR174 Air Astana 5 2026-04-26
KZR157 Air Astana 5 2026-04-29
KZR932 - 4 2026-06-28
KZR918 Air Astana 4 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 KZR638 TGD → NQZ Jul 26, 08:55 UTCJul 26, 21:10 UTC12h 15m
2026-07-25 KZR637 NQZ → TGD Jul 25, 16:10 UTCJul 26, 06:45 UTC14h 36m
2026-07-25 KZR227 NQZ → PEK Jul 25, 13:55 UTCJul 25, 14:15 UTC20m
2026-07-25 KZR227 NQZ → PEK Jul 25, 10:25 UTCJul 25, 10:35 UTC10m
2026-07-24 KZR556 - Jul 24, 11:50 UTCJul 25, 10:35 UTC22h 45m
2026-07-24 KZR556 - Jul 24, 02:05 UTCJul 24, 12:30 UTC10h 25m
2026-07-23 KZR555 - Jul 23, 09:45 UTCJul 24, 09:30 UTC23h 45m
2026-07-23 KZR555 - Jul 23, 08:50 UTCJul 24, 05:50 UTC21h 0m
2026-07-22 KZR912 - Jul 22, 19:05 UTCJul 23, 06:55 UTC11h 50m
2026-07-22 KZR911 ALA → IST Jul 22, 17:00 UTCJul 22, 17:30 UTC30m
2026-07-21 KZR911 ALA → IST Jul 21, 22:50 UTCJul 22, 16:25 UTC17h 35m
2026-07-20 KZR914 - Jul 20, 09:55 UTCJul 20, 10:25 UTC30m
2026-07-20 KZR913 - Jul 20, 08:00 UTCJul 20, 08:15 UTC15m
2026-07-19 KZR664 - Jul 19, 17:40 UTCJul 20, 07:15 UTC13h 35m
2026-07-18 KZR663 - Jul 18, 19:35 UTCJul 19, 15:30 UTC19h 55m
2026-07-18 KZR663 - Jul 18, 17:35 UTCJul 19, 15:30 UTC21h 55m
2026-07-17 KZR663 - Jul 17, 19:35 UTCJul 18, 15:25 UTC19h 51m
2026-07-17 KZR663 - Jul 17, 18:34 UTCJul 18, 15:25 UTC20h 51m
2026-07-16 KZR663 - Jul 16, 23:29 UTCJul 17, 16:24 UTC16h 55m
2026-07-16 KZR663 - Jul 16, 18:05 UTCJul 17, 16:24 UTC22h 20m
2026-07-16 KZR604 - Jul 16, 06:40 UTCJul 16, 23:49 UTC17h 10m
2026-07-16 KZR604 - Jul 16, 03:35 UTCJul 16, 23:49 UTC20h 15m
2026-07-16 KZR604 - Jul 16, 01:35 UTCJul 16, 23:49 UTC22h 15m
2026-07-15 KZR603 - Jul 15, 23:35 UTCJul 16, 23:29 UTC23h 55m
2026-07-15 KZR603 - Jul 15, 23:25 UTCJul 16, 18:19 UTC18h 55m
2026-07-15 KZR603 - Jul 15, 13:35 UTCJul 16, 10:15 UTC20h 40m
2026-07-15 KZR635 - Jul 15, 08:30 UTCJul 15, 11:45 UTC3h 15m
2026-07-14 KZR635 - Jul 14, 11:35 UTCJul 15, 11:30 UTC23h 54m
2026-07-14 KZR636 - Jul 14, 09:45 UTCJul 15, 09:30 UTC23h 44m
2026-07-13 KZR222 - Jul 13, 16:45 UTCJul 14, 08:00 UTC15h 15m
2026-07-12 KZR221 - Jul 12, 23:20 UTCJul 13, 14:45 UTC15h 25m
2026-07-12 KZR221 - Jul 12, 18:05 UTCJul 13, 14:45 UTC20h 40m
2026-07-12 KZR564 - Jul 12, 05:40 UTCJul 12, 23:40 UTC18h 0m
2026-07-11 KZR564 - Jul 11, 23:35 UTCJul 12, 23:30 UTC23h 55m
2026-07-11 KZR563 - Jul 11, 21:35 UTCJul 12, 18:20 UTC20h 45m
2026-07-11 KZR563 - Jul 11, 09:35 UTCJul 12, 08:01 UTC22h 25m
2026-07-11 KZR564 - Jul 11, 07:35 UTCJul 12, 07:31 UTC23h 55m
2026-07-11 KZR563 - Jul 11, 07:15 UTCJul 11, 23:55 UTC16h 40m
2026-07-11 KZR563 - Jul 11, 01:35 UTCJul 11, 23:55 UTC22h 20m
2026-07-10 KZR563 - Jul 10, 23:45 UTCJul 11, 23:30 UTC23h 45m
2026-07-10 KZR563 - Jul 10, 22:15 UTCJul 11, 21:30 UTC23h 15m
2026-07-10 KZR563 - Jul 10, 15:35 UTCJul 11, 09:40 UTC18h 5m
2026-07-10 KZR563 - Jul 10, 13:35 UTCJul 11, 09:40 UTC20h 6m
2026-07-10 KZR563 - Jul 10, 11:35 UTCJul 11, 09:40 UTC22h 5m
2026-07-09 KZR933 FRA → BKK Jul 9, 17:05 UTCJul 10, 09:50 UTC16h 45m
2026-07-09 KZR221 - Jul 9, 10:20 UTCJul 9, 15:15 UTC4h 55m
2026-07-07 KZR194 - Jul 7, 23:05 UTCJul 8, 08:00 UTC8h 55m
2026-07-07 KZR194 - Jul 7, 12:25 UTCJul 8, 08:00 UTC19h 35m
2026-07-07 KZR194 - Jul 7, 09:55 UTCJul 8, 07:30 UTC21h 35m
2026-07-06 KZR635 - Jul 6, 19:05 UTCJul 7, 07:50 UTC12h 45m

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 Jul 26, 21:10 UTC.
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 KZR911, KZR194, KZR564, KZR663, KZR646.