sensors Mode-S transponder
4CAC12
ICAO 24-bit transponder address · allocated to Ireland
Currently assigned to EI-KGC · AIRBUS A-321neo
- Hex
- 4CAC12
- Octal
- 23126022
- Decimal
- 5,024,786
- Country
- IE
- Tail
- EI-KGC
- Type
- A21N
- Flights observed
- 86
- Distinct callsigns
- 20
- Country
- IE
- Last broadcast
- 2h ago
Current position
Country allocation
The ICAO 24-bit address 4CAC12 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 |
|---|---|---|---|
| KZR921 | Air Astana | 9 | 2026-05-30 |
| KZR931 | Air Astana | 7 | 2026-06-01 |
| KZR922 | Air Astana | 6 | 2026-05-30 |
| KZR911 | Air Astana | 6 | 2026-06-02 |
| KZR227 | Air Astana | 6 | 2026-05-27 |
| KZR193 | Air Astana | 6 | 2026-05-14 |
| KZR932 | Air Astana | 4 | 2026-06-02 |
| KZR645 | Air Astana | 3 | 2026-04-26 |
| KZR583 | - | 3 | 2026-05-31 |
| KZR918 | Air Astana | 2 | 2026-05-29 |
| KZR917 | Air Astana | 2 | 2026-05-29 |
| KZR912 | Air Astana | 2 | 2026-05-16 |
| KZR907 | Air Astana | 2 | 2026-05-08 |
| KZR646 | Air Astana | 2 | 2026-04-27 |
| KZR564 | Air Astana | 2 | 2026-05-21 |
| KZR291 | Air Astana | 2 | 2026-04-28 |
| KZR267 | Air Astana | 2 | 2026-04-24 |
| KZR228 | Air Astana | 2 | 2026-05-06 |
| KZR215 | Air Astana | 2 | 2026-05-22 |
| KZR2100 | Air Astana | 2 | 2026-04-19 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-02 | KZR911 | ALA → IST | Jun 2, 17:30 UTC | Jun 2, 17:45 UTC | 15m |
| 2026-06-02 | KZR932 | BKK → ALA | Jun 2, 03:35 UTC | Jun 2, 16:50 UTC | 13h 15m |
| 2026-06-01 | KZR931 | ALA → BKK | Jun 1, 06:35 UTC | Jun 2, 02:05 UTC | 19h 30m |
| 2026-06-01 | KZR931 | ALA → BKK | Jun 1, 06:20 UTC | Jun 2, 02:05 UTC | 19h 45m |
| 2026-06-01 | KZR931 | ALA → BKK | Jun 1, 00:55 UTC | Jun 2, 00:15 UTC | 23h 20m |
| 2026-05-31 | KZR583 | - | May 31, 12:35 UTC | Jun 1, 06:50 UTC | 18h 15m |
| 2026-05-31 | KZR583 | - | May 31, 12:25 UTC | Jun 1, 06:50 UTC | 18h 25m |
| 2026-05-30 | KZR583 | - | May 30, 23:20 UTC | May 31, 22:20 UTC | 23h 0m |
| 2026-05-30 | KZR922 | FRA → NQZ | May 30, 14:35 UTC | May 31, 12:50 UTC | 22h 15m |
| 2026-05-30 | KZR922 | FRA → NQZ | May 30, 13:55 UTC | May 31, 12:30 UTC | 22h 35m |
| 2026-05-30 | KZR921 | NQZ → FRA | May 30, 07:05 UTC | May 30, 11:40 UTC | 4h 35m |
| 2026-05-29 | KZR921 | NQZ → FRA | May 29, 10:35 UTC | May 30, 10:30 UTC | 23h 55m |
| 2026-05-29 | KZR918 | IST → NQZ | May 29, 09:25 UTC | May 30, 08:15 UTC | 22h 50m |
| 2026-05-29 | KZR917 | NQZ → IST | May 29, 07:25 UTC | May 29, 07:55 UTC | 30m |
| 2026-05-28 | KZR922 | FRA → NQZ | May 28, 13:55 UTC | May 29, 06:50 UTC | 16h 55m |
| 2026-05-27 | KZR921 | NQZ → FRA | May 27, 20:10 UTC | May 28, 11:35 UTC | 15h 25m |
| 2026-05-27 | KZR227 | NQZ → PEK | May 27, 17:50 UTC | May 27, 18:05 UTC | 15m |
| 2026-05-27 | KZR227 | NQZ → PEK | May 27, 14:15 UTC | May 27, 14:40 UTC | 25m |
| 2026-05-26 | KZR200 | - | May 26, 00:39 UTC | May 26, 11:54 UTC | 11h 15m |
| 2026-05-25 | KZR200 | - | May 25, 13:10 UTC | May 26, 11:54 UTC | 22h 44m |
| 2026-05-24 | KZR584 | SYX → NQZ | May 24, 23:00 UTC | May 25, 13:40 UTC | 14h 40m |
| 2026-05-24 | KZR918 | IST → NQZ | May 24, 10:20 UTC | May 24, 23:05 UTC | 12h 45m |
| 2026-05-24 | KZR917 | NQZ → IST | May 24, 07:00 UTC | May 24, 07:10 UTC | 10m |
| 2026-05-23 | KZR922 | FRA → NQZ | May 23, 14:05 UTC | May 24, 06:15 UTC | 16h 10m |
| 2026-05-23 | KZR921 | NQZ → FRA | May 23, 07:25 UTC | May 23, 11:50 UTC | 4h 25m |
| 2026-05-22 | KZR921 | NQZ → FRA | May 22, 10:35 UTC | May 23, 10:30 UTC | 23h 54m |
| 2026-05-22 | KZR216 | AYT → NQZ | May 22, 08:40 UTC | May 23, 08:30 UTC | 23h 49m |
| 2026-05-22 | KZR215 | NQZ → AYT | May 22, 04:55 UTC | May 22, 07:10 UTC | 2h 15m |
| 2026-05-21 | KZR215 | NQZ → AYT | May 21, 08:35 UTC | May 22, 07:10 UTC | 22h 35m |
| 2026-05-21 | KZR564 | HKT → ALA | May 21, 08:25 UTC | May 22, 06:05 UTC | 21h 40m |
| 2026-05-21 | KZR564 | HKT → ALA | May 21, 02:45 UTC | May 21, 09:55 UTC | 7h 10m |
| 2026-05-19 | KZR563 | ALA → HKT | May 19, 11:00 UTC | May 20, 04:05 UTC | 17h 5m |
| 2026-05-18 | KZR922 | FRA → NQZ | May 18, 14:15 UTC | May 19, 08:25 UTC | 18h 9m |
| 2026-05-18 | KZR921 | NQZ → FRA | May 18, 07:00 UTC | May 18, 11:35 UTC | 4h 35m |
| 2026-05-16 | KZR912 | IST → ALA | May 16, 19:45 UTC | May 16, 21:00 UTC | 1h 15m |
| 2026-05-16 | KZR912 | IST → ALA | May 16, 18:55 UTC | May 16, 19:05 UTC | 10m |
| 2026-05-16 | KZR911 | ALA → IST | May 16, 06:35 UTC | May 16, 16:00 UTC | 9h 25m |
| 2026-05-15 | KZR911 | ALA → IST | May 15, 14:45 UTC | May 16, 05:00 UTC | 14h 14m |
| 2026-05-14 | KZR911 | ALA → IST | May 14, 23:15 UTC | May 15, 20:55 UTC | 21h 39m |
| 2026-05-14 | KZR193 | ALA → CXR | May 14, 20:35 UTC | May 15, 20:30 UTC | 23h 54m |
| 2026-05-14 | KZR193 | ALA → CXR | May 14, 19:35 UTC | May 15, 16:00 UTC | 20h 24m |
| 2026-05-12 | KZR664 | SCO → ALA | May 12, 17:25 UTC | May 12, 22:10 UTC | 4h 45m |
| 2026-05-11 | KZR663 | SCO → LHR | May 11, 21:15 UTC | May 12, 15:40 UTC | 18h 25m |
| 2026-05-11 | KZR911 | ALA → IST | May 11, 14:50 UTC | May 11, 16:10 UTC | 1h 20m |
| 2026-05-09 | KZR932 | BKK → ALA | May 9, 03:35 UTC | May 9, 07:45 UTC | 4h 10m |
| 2026-05-08 | KZR931 | ALA → BKK | May 8, 06:35 UTC | May 9, 01:45 UTC | 19h 10m |
| 2026-05-08 | KZR907 | ALA → DEL | May 8, 04:00 UTC | May 8, 05:00 UTC | 1h 0m |
| 2026-05-06 | KZR228 | PEK → NQZ | May 6, 20:15 UTC | May 6, 20:30 UTC | 15m |
| 2026-05-06 | KZR227 | NQZ → PEK | May 6, 18:05 UTC | May 6, 18:25 UTC | 20m |
| 2026-05-06 | KZR227 | NQZ → PEK | May 6, 14:25 UTC | May 6, 14:45 UTC | 20m |
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-KGC page for operator, model, and routing details .