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
Broadcasting now · callsign KZR635 · 36,000 ft
Flights observed
185
Distinct callsigns
20
Country
IE
Last broadcast
1h ago

Current position

4CAC16 is currently broadcasting. Map zoomed to live position.

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 15 2026-07-03
KZR194 - 14 2026-07-07
KZR564 - 13 2026-07-12
KZR646 Air Astana 11 2026-05-25
KZR563 - 11 2026-07-11
KZR221 - 11 2026-07-12
KZR222 - 8 2026-07-13
KZR922 Air Astana 6 2026-04-22
KZR921 Air Astana 6 2026-04-22
KZR663 - 6 2026-07-03
KZR931 - 5 2026-06-27
KZR912 Air Astana 5 2026-06-18
KZR664 - 5 2026-07-04
KZR645 Air Astana 5 2026-05-10
KZR604 Air Astana 5 2026-06-04
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
KZR917 Air Astana 4 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KZR222 - Jul 13, 16:45 UTCJul 14, 05:30 UTC12h 45m
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
2026-07-05 KZR194 - Jul 5, 22:10 UTCJul 6, 17:20 UTC19h 10m
2026-07-05 KZR194 - Jul 5, 12:35 UTCJul 6, 07:25 UTC18h 50m
2026-07-05 KZR194 - Jul 5, 10:25 UTCJul 6, 07:25 UTC21h 0m
2026-07-04 KZR664 - Jul 4, 17:30 UTCJul 5, 08:50 UTC15h 20m
2026-07-03 KZR663 - Jul 3, 20:15 UTCJul 4, 15:15 UTC19h 0m
2026-07-03 KZR663 - Jul 3, 18:45 UTCJul 4, 15:15 UTC20h 30m
2026-07-03 KZR911 ALA → IST Jul 3, 16:40 UTCJul 3, 17:00 UTC20m
2026-07-02 KZR194 CXR → ALA Jul 2, 22:25 UTCJul 3, 15:55 UTC17h 30m
2026-07-02 KZR194 CXR → ALA Jul 2, 09:35 UTCJul 3, 07:35 UTC22h 0m
2026-07-02 KZR194 CXR → ALA Jul 2, 09:05 UTCJul 3, 07:30 UTC22h 25m
2026-07-02 KZR8003 ALA → LCA Jul 2, 05:05 UTCJul 2, 07:15 UTC2h 10m
2026-07-01 KZR194 CXR → ALA Jul 1, 05:35 UTCJul 2, 05:30 UTC23h 55m
2026-06-30 KZR194 CXR → ALA Jun 30, 22:20 UTCJul 1, 07:25 UTC9h 5m
2026-06-29 KZR599 ALA → DAD Jun 29, 00:29 UTCJun 29, 05:50 UTC5h 20m
2026-06-28 KZR599 ALA → DAD Jun 28, 07:34 UTCJun 29, 05:50 UTC22h 15m
2026-06-28 KZR932 - Jun 28, 05:34 UTCJun 29, 05:04 UTC23h 30m
2026-06-28 KZR932 - Jun 28, 03:40 UTCJun 29, 01:25 UTC21h 45m
2026-06-27 KZR931 - Jun 27, 07:34 UTCJun 28, 01:59 UTC18h 25m
2026-06-27 KZR931 - Jun 27, 05:35 UTCJun 28, 01:59 UTC20h 25m
2026-06-27 KZR931 - Jun 27, 04:49 UTCJun 28, 01:59 UTC21h 10m
2026-06-27 KZR194 CXR → ALA Jun 27, 00:39 UTCJun 27, 23:29 UTC22h 50m
2026-06-26 KZR194 CXR → ALA Jun 26, 11:49 UTCJun 27, 09:04 UTC21h 15m
2026-06-26 KZR194 CXR → ALA Jun 26, 10:10 UTCJun 27, 09:04 UTC22h 55m
2026-06-25 KZR222 FRA → ALA Jun 25, 16:50 UTCJun 26, 07:55 UTC15h 5m
2026-06-25 KZR221 - Jun 25, 10:45 UTCJun 25, 15:04 UTC4h 20m
2026-06-23 KZR664 - Jun 23, 17:39 UTCJun 23, 22:25 UTC4h 45m
2026-06-22 KZR663 - Jun 22, 20:19 UTCJun 23, 15:30 UTC19h 10m
2026-06-22 KZR663 - Jun 22, 18:54 UTCJun 23, 15:30 UTC20h 35m
2026-06-22 KZR911 ALA → IST Jun 22, 16:50 UTCJun 22, 17:10 UTC20m

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?
Yes. Mode-S 4CAC16 is currently airborne.
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, KZR646, KZR563.