sensors Mode-S transponder
4CAC09
ICAO 24-bit transponder address · allocated to Ireland
Currently assigned to EI-KDB · AIRBUS A-321
- Hex
- 4CAC09
- Octal
- 23126011
- Decimal
- 5,024,777
- Country
- IE
- Tail
- EI-KDB
- Type
- A321
- Flights observed
- 33
- Distinct callsigns
- 12
- Country
- IE
- Last broadcast
- 2h ago
Last known position
Country allocation
The ICAO 24-bit address 4CAC09 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 12 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| KZR908 | - | 6 | 2026-07-01 |
| KZR907 | - | 6 | 2026-07-01 |
| KZR963 | - | 5 | 2026-07-04 |
| KZR964 | - | 4 | 2026-07-04 |
| KZR141 | Air Astana | 3 | 2026-06-17 |
| KZR860 | Air Astana | 2 | 2026-06-12 |
| KZR859 | Air Astana | 2 | 2026-05-18 |
| KZR292 | Air Astana | 1 | 2026-06-03 |
| KZR291 | Air Astana | 1 | 2026-06-02 |
| KZR142 | Air Astana | 1 | 2026-05-28 |
| KZR1385 | - | 1 | 2026-05-01 |
| KZR1369 | Air Astana | 1 | 2026-05-12 |
Recent flights last 33
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-04 | KZR964 | - | Jul 4, 19:55 UTC | Jul 4, 20:40 UTC | 45m |
| 2026-07-04 | KZR963 | - | Jul 4, 17:55 UTC | Jul 4, 18:35 UTC | 40m |
| 2026-07-01 | KZR908 | - | Jul 1, 06:30 UTC | Jul 1, 07:10 UTC | 40m |
| 2026-07-01 | KZR907 | - | Jul 1, 04:05 UTC | Jul 1, 04:55 UTC | 50m |
| 2026-06-20 | KZR908 | - | Jun 20, 06:35 UTC | Jun 20, 07:14 UTC | 40m |
| 2026-06-20 | KZR907 | - | Jun 20, 04:04 UTC | Jun 20, 04:54 UTC | 50m |
| 2026-06-17 | KZR964 | - | Jun 17, 20:35 UTC | Jun 17, 21:10 UTC | 35m |
| 2026-06-17 | KZR963 | ALA → DEL | Jun 17, 10:35 UTC | Jun 17, 18:50 UTC | 8h 15m |
| 2026-06-17 | KZR141 | ALA → TBS | Jun 17, 08:35 UTC | Jun 17, 09:10 UTC | 35m |
| 2026-06-15 | KZR908 | - | Jun 15, 06:20 UTC | Jun 15, 07:00 UTC | 40m |
| 2026-06-15 | KZR907 | - | Jun 15, 04:04 UTC | Jun 15, 05:04 UTC | 1h 0m |
| 2026-06-12 | KZR860 | SCO → ALA | Jun 12, 20:25 UTC | Jun 12, 20:35 UTC | 10m |
| 2026-06-10 | KZR908 | DEL → ALA | Jun 10, 07:00 UTC | Jun 10, 07:40 UTC | 40m |
| 2026-06-09 | KZR907 | ALA → DEL | Jun 9, 20:55 UTC | Jun 10, 05:10 UTC | 8h 15m |
| 2026-06-09 | KZR963 | ALA → DEL | Jun 9, 17:45 UTC | Jun 9, 19:25 UTC | 1h 40m |
| 2026-06-05 | KZR860 | SCO → ALA | Jun 5, 20:30 UTC | Jun 5, 20:40 UTC | 10m |
| 2026-06-03 | KZR292 | BOM → ALA | Jun 3, 00:45 UTC | Jun 3, 02:25 UTC | 1h 40m |
| 2026-06-02 | KZR291 | ALA → BOM | Jun 2, 22:55 UTC | Jun 2, 23:15 UTC | 20m |
| 2026-06-02 | KZR908 | DEL → ALA | Jun 2, 07:05 UTC | Jun 2, 22:25 UTC | 15h 20m |
| 2026-06-02 | KZR907 | ALA → DEL | Jun 2, 04:20 UTC | Jun 2, 05:35 UTC | 1h 15m |
| 2026-05-30 | KZR964 | DEL → ALA | May 30, 20:25 UTC | May 30, 21:10 UTC | 45m |
| 2026-05-30 | KZR963 | ALA → DEL | May 30, 10:45 UTC | May 30, 19:00 UTC | 8h 15m |
| 2026-05-30 | KZR141 | ALA → TBS | May 30, 09:00 UTC | May 30, 09:25 UTC | 25m |
| 2026-05-28 | KZR142 | TBS → ALA | May 28, 09:45 UTC | May 28, 10:10 UTC | 25m |
| 2026-05-28 | KZR141 | ALA → TBS | May 28, 07:50 UTC | May 28, 08:15 UTC | 25m |
| 2026-05-24 | KZR964 | DEL → ALA | May 24, 20:00 UTC | May 24, 20:40 UTC | 40m |
| 2026-05-24 | KZR963 | ALA → DEL | May 24, 17:40 UTC | May 24, 18:30 UTC | 50m |
| 2026-05-19 | KZR908 | DEL → ALA | May 19, 06:55 UTC | May 19, 07:35 UTC | 40m |
| 2026-05-19 | KZR907 | ALA → DEL | May 19, 04:30 UTC | May 19, 05:15 UTC | 45m |
| 2026-05-18 | KZR859 | ALA → SCO | May 18, 12:05 UTC | May 18, 12:25 UTC | 20m |
| 2026-05-18 | KZR859 | ALA → SCO | May 18, 10:05 UTC | May 18, 10:30 UTC | 25m |
| 2026-05-12 | KZR1369 | MST → MST | May 12, 15:01 UTC | May 12, 18:55 UTC | 3h 55m |
| 2026-05-01 | KZR1385 | - | May 1, 09:40 UTC | May 1, 13:30 UTC | 3h 50m |
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-KDB page for operator, model, and routing details .