sensors Mode-S transponder
4CAF11
ICAO 24-bit transponder address · allocated to Ireland
- Hex
- 4CAF11
- Octal
- 23127421
- Decimal
- 5,025,553
- Country
- IE
- Flights observed
- 132
- Distinct callsigns
- 20
- Country
- IE
- Last broadcast
- 13d ago
Last known position
Country allocation
The ICAO 24-bit address 4CAF11 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 |
|---|---|---|---|
| KZR925 | - | 19 | 2026-07-04 |
| KZR926 | - | 13 | 2026-07-14 |
| KZR553 | - | 13 | 2026-07-20 |
| KZR554 | - | 11 | 2026-07-20 |
| KZR659 | Air Astana | 9 | 2026-07-25 |
| KZR589 | - | 9 | 2026-07-09 |
| KZR915 | - | 5 | 2026-07-15 |
| KZR8244 | Air Astana | 4 | 2026-07-24 |
| KZR660 | Air Astana | 4 | 2026-07-26 |
| KZR963 | - | 3 | 2026-07-22 |
| KZR916 | - | 3 | 2026-07-01 |
| KZR908 | - | 3 | 2026-07-05 |
| KZR8245 | Air Astana | 3 | 2026-07-24 |
| KZR8225 | Air Astana | 3 | 2026-07-18 |
| KZR590 | - | 3 | 2026-06-25 |
| KZR964 | - | 2 | 2026-07-22 |
| KZR907 | - | 2 | 2026-07-05 |
| KZR859 | Air Astana | 2 | 2026-06-10 |
| KZR592 | - | 2 | 2026-07-21 |
| KZR558 | - | 2 | 2026-07-16 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | KZR660 | BJV → ALA | Jul 26, 13:25 UTC | Jul 26, 15:35 UTC | 2h 10m |
| 2026-07-25 | KZR659 | ALA → BJV | Jul 25, 22:40 UTC | Jul 26, 11:45 UTC | 13h 6m |
| 2026-07-25 | KZR267 | ALA → PEK | Jul 25, 20:30 UTC | Jul 25, 20:50 UTC | 20m |
| 2026-07-25 | KZR142 | TBS → ALA | Jul 25, 10:45 UTC | Jul 25, 11:10 UTC | 25m |
| 2026-07-25 | KZR141 | ALA → TBS | Jul 25, 08:45 UTC | Jul 25, 09:15 UTC | 30m |
| 2026-07-24 | KZR8245 | AYT → ALA | Jul 24, 08:05 UTC | Jul 24, 09:55 UTC | 1h 50m |
| 2026-07-24 | KZR8244 | ALA → AYT | Jul 24, 04:00 UTC | Jul 24, 06:30 UTC | 2h 30m |
| 2026-07-22 | KZR964 | - | Jul 22, 20:00 UTC | Jul 22, 20:35 UTC | 35m |
| 2026-07-22 | KZR963 | - | Jul 22, 17:45 UTC | Jul 22, 18:40 UTC | 55m |
| 2026-07-21 | KZR592 | - | Jul 21, 10:45 UTC | Jul 22, 05:00 UTC | 18h 15m |
| 2026-07-20 | KZR554 | - | Jul 20, 13:25 UTC | Jul 21, 08:30 UTC | 19h 4m |
| 2026-07-20 | KZR553 | - | Jul 20, 08:45 UTC | Jul 20, 11:30 UTC | 2h 45m |
| 2026-07-18 | KZR8226 | AYT → NQZ | Jul 18, 08:20 UTC | Jul 18, 09:35 UTC | 1h 15m |
| 2026-07-18 | KZR8225 | NQZ → AYT | Jul 18, 04:15 UTC | Jul 18, 06:45 UTC | 2h 30m |
| 2026-07-17 | KZR8225 | NQZ → AYT | Jul 17, 08:20 UTC | Jul 18, 06:45 UTC | 22h 26m |
| 2026-07-17 | KZR8225 | NQZ → AYT | Jul 17, 08:04 UTC | Jul 18, 06:15 UTC | 22h 11m |
| 2026-07-17 | KZR225 | - | Jul 17, 06:00 UTC | Jul 17, 06:25 UTC | 25m |
| 2026-07-16 | KZR558 | - | Jul 16, 07:30 UTC | Jul 16, 10:00 UTC | 2h 30m |
| 2026-07-15 | KZR557 | - | Jul 15, 11:05 UTC | Jul 16, 05:30 UTC | 18h 25m |
| 2026-07-15 | KZR915 | - | Jul 15, 07:10 UTC | Jul 15, 09:40 UTC | 2h 30m |
| 2026-07-14 | KZR915 | - | Jul 14, 10:20 UTC | Jul 15, 09:40 UTC | 23h 19m |
| 2026-07-14 | KZR926 | - | Jul 14, 09:25 UTC | Jul 15, 08:15 UTC | 22h 49m |
| 2026-07-13 | KZR554 | - | Jul 13, 13:00 UTC | Jul 14, 07:45 UTC | 18h 45m |
| 2026-07-13 | KZR553 | - | Jul 13, 08:10 UTC | Jul 13, 11:05 UTC | 2h 55m |
| 2026-07-12 | KZR553 | - | Jul 12, 10:20 UTC | Jul 13, 10:15 UTC | 23h 55m |
| 2026-07-12 | KZR8245 | - | Jul 12, 08:40 UTC | Jul 13, 08:15 UTC | 23h 35m |
| 2026-07-11 | KZR8244 | DEL → AYT | Jul 11, 20:10 UTC | Jul 12, 06:50 UTC | 10h 40m |
| 2026-07-11 | KZR963 | TBS → DEL | Jul 11, 10:40 UTC | Jul 11, 18:10 UTC | 7h 30m |
| 2026-07-11 | KZR141 | - | Jul 11, 08:40 UTC | Jul 11, 09:15 UTC | 35m |
| 2026-07-10 | KZR8245 | - | Jul 10, 08:00 UTC | Jul 10, 09:50 UTC | 1h 50m |
| 2026-07-09 | KZR8244 | - | Jul 9, 13:20 UTC | Jul 10, 06:15 UTC | 16h 55m |
| 2026-07-09 | KZR589 | - | Jul 9, 08:45 UTC | Jul 9, 11:10 UTC | 2h 25m |
| 2026-07-07 | KZR592 | - | Jul 7, 10:50 UTC | Jul 7, 12:45 UTC | 1h 55m |
| 2026-07-06 | KZR591 | - | Jul 6, 14:35 UTC | Jul 7, 08:25 UTC | 17h 50m |
| 2026-07-06 | KZR554 | - | Jul 6, 13:10 UTC | Jul 7, 08:25 UTC | 19h 15m |
| 2026-07-06 | KZR553 | - | Jul 6, 08:05 UTC | Jul 6, 11:10 UTC | 3h 5m |
| 2026-07-05 | KZR553 | - | Jul 5, 10:20 UTC | Jul 6, 10:15 UTC | 23h 55m |
| 2026-07-05 | KZR908 | - | Jul 5, 10:00 UTC | Jul 6, 08:15 UTC | 22h 15m |
| 2026-07-05 | KZR907 | - | Jul 5, 07:55 UTC | Jul 5, 08:35 UTC | 40m |
| 2026-07-05 | KZR907 | - | Jul 5, 04:35 UTC | Jul 5, 05:45 UTC | 1h 10m |
| 2026-07-04 | KZR926 | - | Jul 4, 08:20 UTC | Jul 5, 05:45 UTC | 21h 25m |
| 2026-07-04 | KZR926 | - | Jul 4, 08:05 UTC | Jul 5, 05:45 UTC | 21h 40m |
| 2026-07-04 | KZR925 | - | Jul 4, 04:00 UTC | Jul 4, 06:25 UTC | 2h 25m |
| 2026-07-03 | KZR925 | - | Jul 3, 08:20 UTC | Jul 4, 06:25 UTC | 22h 5m |
| 2026-07-03 | KZR925 | - | Jul 3, 08:00 UTC | Jul 4, 06:15 UTC | 22h 15m |
| 2026-07-02 | KZR8244 | - | Jul 2, 13:10 UTC | Jul 3, 06:30 UTC | 17h 20m |
| 2026-07-02 | KZR589 | - | Jul 2, 08:30 UTC | Jul 2, 11:00 UTC | 2h 30m |
| 2026-07-01 | KZR589 | - | Jul 1, 12:20 UTC | Jul 2, 11:00 UTC | 22h 40m |
| 2026-07-01 | KZR916 | - | Jul 1, 11:15 UTC | Jul 2, 10:15 UTC | 23h 0m |
| 2026-06-30 | KZR915 | - | Jun 30, 20:05 UTC | Jul 1, 09:40 UTC | 13h 35m |
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.