sensors Mode-S transponder
4CAF10
ICAO 24-bit transponder address · allocated to Ireland
Currently assigned to EI-KFH
- Hex
- 4CAF10
- Octal
- 23127420
- Decimal
- 5,025,552
- Country
- IE
- Tail
- EI-KFH
- Type
- A20N
- Flights observed
- 32
- Distinct callsigns
- 19
- Country
- IE
- Last broadcast
- 1h ago
Last known position
Country allocation
The ICAO 24-bit address 4CAF10 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 19 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| AYN7151 | - | 4 | 2026-06-09 |
| AYN7817 | - | 3 | 2026-06-18 |
| AYN7475 | - | 3 | 2026-06-18 |
| AYN7951 | - | 2 | 2026-06-04 |
| AYN7875 | - | 2 | 2026-06-20 |
| AYN7819 | - | 2 | 2026-06-17 |
| AYN7154 | - | 2 | 2026-06-14 |
| AYN7153 | - | 2 | 2026-06-14 |
| AYN7152 | - | 2 | 2026-06-09 |
| AYN7994 | - | 1 | 2026-06-20 |
| AYN7952 | - | 1 | 2026-06-04 |
| AYN7876 | - | 1 | 2026-06-20 |
| AYN7818 | - | 1 | 2026-06-19 |
| AYN7352 | - | 1 | 2026-06-01 |
| AYN7351 | - | 1 | 2026-06-01 |
| AYN7173 | - | 1 | 2026-06-14 |
| AYN7111 | - | 1 | 2026-06-24 |
| AYN7078 | - | 1 | 2026-06-11 |
| AYN7077 | - | 1 | 2026-06-11 |
Recent flights last 32
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-24 | AYN7111 | - | Jun 24, 08:35 UTC | Jun 24, 09:49 UTC | 1h 15m |
| 2026-06-20 | AYN7994 | - | Jun 20, 15:29 UTC | Jun 20, 16:19 UTC | 50m |
| 2026-06-20 | AYN7876 | - | Jun 20, 08:34 UTC | Jun 20, 14:35 UTC | 6h 0m |
| 2026-06-20 | AYN7875 | - | Jun 20, 04:44 UTC | Jun 20, 07:14 UTC | 2h 30m |
| 2026-06-19 | AYN7875 | - | Jun 19, 10:04 UTC | Jun 20, 07:14 UTC | 21h 10m |
| 2026-06-19 | AYN7818 | - | Jun 19, 09:14 UTC | Jun 20, 05:59 UTC | 20h 45m |
| 2026-06-18 | AYN7817 | - | Jun 18, 12:05 UTC | Jun 19, 07:59 UTC | 19h 54m |
| 2026-06-18 | AYN7817 | - | Jun 18, 10:55 UTC | Jun 19, 07:59 UTC | 21h 4m |
| 2026-06-18 | AYN7817 | - | Jun 18, 08:05 UTC | Jun 19, 07:59 UTC | 23h 54m |
| 2026-06-18 | AYN7475 | - | Jun 18, 06:55 UTC | Jun 19, 05:59 UTC | 23h 4m |
| 2026-06-17 | AYN7475 | - | Jun 17, 12:05 UTC | Jun 18, 12:00 UTC | 23h 55m |
| 2026-06-17 | AYN7475 | - | Jun 17, 11:45 UTC | Jun 18, 08:55 UTC | 21h 10m |
| 2026-06-17 | AYN7819 | - | Jun 17, 10:00 UTC | Jun 17, 10:30 UTC | 30m |
| 2026-06-17 | AYN7819 | - | Jun 17, 08:00 UTC | Jun 17, 09:25 UTC | 1h 25m |
| 2026-06-14 | AYN7154 | - | Jun 14, 14:20 UTC | Jun 14, 14:55 UTC | 35m |
| 2026-06-14 | AYN7153 | - | Jun 14, 08:20 UTC | Jun 14, 13:30 UTC | 5h 10m |
| 2026-06-14 | AYN7173 | - | Jun 14, 06:50 UTC | Jun 14, 07:15 UTC | 25m |
| 2026-06-12 | AYN7154 | - | Jun 12, 13:10 UTC | Jun 12, 13:40 UTC | 30m |
| 2026-06-12 | AYN7153 | - | Jun 12, 11:50 UTC | Jun 12, 12:15 UTC | 25m |
| 2026-06-11 | AYN7078 | - | Jun 11, 07:00 UTC | Jun 11, 07:40 UTC | 40m |
| 2026-06-11 | AYN7077 | - | Jun 11, 04:55 UTC | Jun 11, 05:55 UTC | 1h 0m |
| 2026-06-09 | AYN7152 | - | Jun 9, 08:35 UTC | Jun 9, 08:55 UTC | 20m |
| 2026-06-09 | AYN7151 | - | Jun 9, 07:10 UTC | Jun 9, 07:45 UTC | 35m |
| 2026-06-04 | AYN7952 | - | Jun 4, 09:15 UTC | Jun 4, 11:45 UTC | 2h 30m |
| 2026-06-04 | AYN7951 | - | Jun 4, 08:00 UTC | Jun 4, 08:15 UTC | 15m |
| 2026-06-04 | AYN7951 | - | Jun 4, 06:15 UTC | Jun 4, 07:20 UTC | 1h 5m |
| 2026-06-01 | AYN7352 | - | Jun 1, 11:35 UTC | Jun 1, 11:55 UTC | 20m |
| 2026-06-01 | AYN7351 | - | Jun 1, 10:25 UTC | Jun 1, 10:40 UTC | 15m |
| 2026-04-25 | AYN7152 | - | Apr 25, 08:40 UTC | Apr 25, 09:00 UTC | 20m |
| 2026-04-24 | AYN7151 | - | Apr 24, 16:45 UTC | Apr 25, 07:50 UTC | 15h 5m |
| 2026-04-24 | AYN7151 | PLX → PLX | Apr 24, 08:35 UTC | Apr 25, 07:50 UTC | 23h 15m |
| 2026-04-24 | AYN7151 | - | Apr 24, 07:10 UTC | Apr 24, 07:45 UTC | 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.
Prefer a tail-number view? See the EI-KFH page for operator, model, and routing details .