Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign KZR931 · 33,025 ft
Flights observed
109
Distinct callsigns
20
Country
IE
Last broadcast
18h ago

Current position

4CAC15 is currently broadcasting. Map zoomed to live position.

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 - 15 2026-06-21
KZR917 Air Astana 13 2026-06-02
KZR921 Air Astana 9 2026-05-19
KZR221 - 7 2026-06-21
KZR157 Air Astana 6 2026-05-27
KZR664 Air Astana 5 2026-06-14
KZR918 Air Astana 4 2026-06-02
KZR911 Air Astana 4 2026-06-15
KZR556 - 4 2026-06-23
KZR199 - 4 2026-06-01
KZR932 Air Astana 3 2026-05-17
KZR931 Air Astana 3 2026-05-16
KZR636 Air Astana 3 2026-06-19
KZR635 Air Astana 3 2026-06-16
KZR222 Air Astana 3 2026-06-22
KZR200 - 3 2026-06-01
KZR922 Air Astana 2 2026-05-20
KZR912 Air Astana 2 2026-05-14
KZR260 Air Astana 2 2026-06-01
KZR210 Air Astana 2 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-23 KZR556 - Jun 23, 09:20 UTCJun 24, 04:59 UTC19h 40m
2026-06-23 KZR556 - Jun 23, 09:14 UTCJun 24, 04:59 UTC19h 45m
2026-06-23 KZR556 - Jun 23, 05:24 UTCJun 24, 04:59 UTC23h 35m
2026-06-23 KZR556 - Jun 23, 03:20 UTCJun 24, 01:24 UTC22h 5m
2026-06-23 KZR555 - Jun 23, 03:09 UTCJun 24, 01:14 UTC22h 5m
2026-06-22 KZR222 FRA → ALA Jun 22, 17:20 UTCJun 23, 12:40 UTC19h 20m
2026-06-22 KZR222 FRA → ALA Jun 22, 17:00 UTCJun 23, 12:40 UTC19h 40m
2026-06-21 KZR221 - Jun 21, 19:20 UTCJun 22, 14:55 UTC19h 35m
2026-06-21 KZR221 - Jun 21, 18:00 UTCJun 22, 14:55 UTC20h 55m
2026-06-21 KZR663 - Jun 21, 10:25 UTCJun 21, 15:54 UTC5h 30m
2026-06-19 KZR636 TGD → ALA Jun 19, 09:55 UTCJun 19, 23:29 UTC13h 35m
2026-06-18 KZR222 FRA → ALA Jun 18, 16:45 UTCJun 19, 08:04 UTC15h 19m
2026-06-18 KZR221 - Jun 18, 10:05 UTCJun 18, 14:35 UTC4h 30m
2026-06-16 KZR636 TGD → ALA Jun 16, 10:00 UTCJun 17, 05:00 UTC19h 1m
2026-06-16 KZR636 TGD → ALA Jun 16, 07:20 UTCJun 17, 05:00 UTC21h 41m
2026-06-16 KZR635 ALA → TGD Jun 16, 05:20 UTCJun 17, 05:00 UTC23h 41m
2026-06-16 KZR635 ALA → TGD Jun 16, 04:50 UTCJun 17, 01:10 UTC20h 21m
2026-06-15 KZR635 ALA → TGD Jun 15, 19:10 UTCJun 16, 12:35 UTC17h 25m
2026-06-15 KZR911 ALA → IST Jun 15, 16:59 UTCJun 15, 17:20 UTC20m
2026-06-14 KZR911 ALA → IST Jun 14, 21:55 UTCJun 15, 16:15 UTC18h 20m
2026-06-14 KZR664 SCO → ALA Jun 14, 19:20 UTCJun 15, 16:15 UTC20h 54m
2026-06-14 KZR664 SCO → ALA Jun 14, 17:45 UTCJun 15, 16:15 UTC22h 29m
2026-06-13 KZR663 - Jun 13, 21:20 UTCJun 14, 15:50 UTC18h 30m
2026-06-13 KZR663 - Jun 13, 19:20 UTCJun 14, 15:50 UTC20h 30m
2026-06-13 KZR663 - Jun 13, 17:20 UTCJun 14, 15:50 UTC22h 31m
2026-06-13 KZR663 - Jun 13, 17:05 UTCJun 14, 15:15 UTC22h 10m
2026-06-12 KZR663 SCO → LHR Jun 12, 19:20 UTCJun 13, 15:15 UTC19h 54m
2026-06-12 KZR663 SCO → LHR Jun 12, 18:30 UTCJun 13, 15:15 UTC20h 44m
2026-06-11 KZR663 SCO → LHR Jun 11, 23:30 UTCJun 12, 16:30 UTC17h 0m
2026-06-11 KZR663 SCO → LHR Jun 11, 18:10 UTCJun 12, 16:30 UTC22h 20m
2026-06-10 KZR587 - Jun 10, 23:30 UTCJun 11, 18:25 UTC18h 55m
2026-06-09 KZR664 SCO → ALA Jun 9, 18:20 UTCJun 9, 22:35 UTC4h 15m
2026-06-08 KZR663 SCO → LHR Jun 8, 22:25 UTCJun 9, 15:50 UTC17h 25m
2026-06-08 KZR267 ALA → PEK Jun 8, 20:30 UTCJun 8, 20:45 UTC15m
2026-06-07 KZR8004 LCA → ALA Jun 7, 10:25 UTCJun 8, 01:10 UTC14h 45m
2026-06-07 KZR8003 ALA → LCA Jun 7, 07:45 UTCJun 7, 07:55 UTC10m
2026-06-06 KZR664 SCO → ALA Jun 6, 17:24 UTCJun 7, 06:40 UTC13h 15m
2026-06-05 KZR663 SCO → LHR Jun 5, 19:20 UTCJun 6, 15:10 UTC19h 50m
2026-06-05 KZR664 SCO → ALA Jun 5, 18:25 UTCJun 6, 15:10 UTC20h 45m
2026-06-05 KZR663 SCO → LHR Jun 5, 10:55 UTCJun 5, 16:35 UTC5h 40m
2026-06-04 KZR663 SCO → LHR Jun 4, 19:20 UTCJun 5, 16:35 UTC21h 15m
2026-06-04 KZR663 SCO → LHR Jun 4, 17:20 UTCJun 5, 16:35 UTC23h 15m
2026-06-04 KZR663 SCO → LHR Jun 4, 17:10 UTCJun 5, 15:15 UTC22h 5m
2026-06-04 KZR221 ALA → FRA Jun 4, 10:25 UTCJun 4, 15:00 UTC4h 35m
2026-06-03 KZR221 ALA → FRA Jun 3, 11:20 UTCJun 4, 11:15 UTC23h 55m
2026-06-02 KZR918 IST → NQZ Jun 2, 20:05 UTCJun 3, 10:05 UTC14h 0m
2026-06-02 KZR917 NQZ → IST Jun 2, 18:05 UTCJun 2, 18:30 UTC25m
2026-06-02 KZR917 NQZ → IST Jun 2, 00:35 UTCJun 2, 17:35 UTC17h 0m
2026-06-01 KZR917 NQZ → IST Jun 1, 19:20 UTCJun 2, 17:35 UTC22h 15m
2026-06-01 KZR260 DAD → NQZ Jun 1, 19:05 UTCJun 2, 17:15 UTC22h 10m

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?
Yes. Mode-S 4CAC15 is currently airborne.
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, KZR917, KZR921, KZR221, KZR157.