sensors Mode-S transponder
4CAF76
ICAO 24-bit transponder address · allocated to Ireland
- Hex
- 4CAF76
- Octal
- 23127566
- Decimal
- 5,025,654
- Country
- IE
- Flights observed
- 19
- Distinct callsigns
- 16
- Country
- IE
- Last broadcast
- 12d ago
Last known position
Country allocation
The ICAO 24-bit address 4CAF76 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 16 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| RYR86QW | Ryanair | 2 | 2026-05-31 |
| RYR54NN | Ryanair | 2 | 2026-05-20 |
| RYR86MF | Ryanair | 1 | 2026-06-01 |
| RYR86DX | Ryanair | 1 | 2026-05-22 |
| RYR81TF | Ryanair | 1 | 2026-06-02 |
| RYR8086 | - | 1 | 2026-05-16 |
| RYR7CV | Ryanair | 1 | 2026-05-12 |
| RYR6UF | Ryanair | 1 | 2026-05-19 |
| RYR59WU | Ryanair | 1 | 2026-05-24 |
| RYR532Q | Ryanair | 1 | 2026-06-03 |
| RYR43JJ | Ryanair | 1 | 2026-05-24 |
| RYR3LC | Ryanair | 1 | 2026-05-18 |
| RYR3DK | Ryanair | 1 | 2026-05-15 |
| RYR3177 | Ryanair | 1 | 2026-05-15 |
| RYR19PR | Ryanair | 1 | 2026-05-25 |
| RYR18ZU | Ryanair | 1 | 2026-05-16 |
Recent flights last 19
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-18 | - | - | Jun 18, 18:35 UTC | Jun 18, 18:50 UTC | 15m |
| 2026-06-03 | RYR532Q | AGP → NCL | Jun 3, 23:00 UTC | Jun 3, 23:10 UTC | 10m |
| 2026-06-02 | RYR81TF | AGP → NCL | Jun 2, 23:05 UTC | Jun 2, 23:15 UTC | 10m |
| 2026-06-01 | RYR86MF | NCL → ALC | Jun 1, 17:50 UTC | Jun 1, 23:15 UTC | 5h 25m |
| 2026-05-31 | RYR86QW | IBZ → NCL | May 31, 22:50 UTC | Jun 1, 18:00 UTC | 19h 10m |
| 2026-05-31 | RYR86QW | IBZ → NCL | May 31, 17:40 UTC | May 31, 22:55 UTC | 5h 15m |
| 2026-05-25 | RYR19PR | DUB → VRN | May 25, 10:30 UTC | May 25, 14:35 UTC | 4h 5m |
| 2026-05-24 | RYR43JJ | BLQ → BDS | May 24, 09:00 UTC | May 24, 09:10 UTC | 10m |
| 2026-05-24 | RYR59WU | DUB → LTN | May 24, 07:25 UTC | May 24, 07:40 UTC | 15m |
| 2026-05-22 | RYR86DX | NRN → NDR | May 22, 15:20 UTC | May 22, 15:30 UTC | 10m |
| 2026-05-20 | RYR54NN | REU → LBA | May 20, 13:20 UTC | May 20, 17:30 UTC | 4h 10m |
| 2026-05-19 | RYR54NN | REU → LBA | May 19, 18:40 UTC | May 20, 17:30 UTC | 22h 51m |
| 2026-05-19 | RYR6UF | EDI → HAM | May 19, 14:25 UTC | May 20, 13:20 UTC | 22h 56m |
| 2026-05-18 | RYR3LC | STN → DUB | May 18, 15:40 UTC | May 19, 14:35 UTC | 22h 54m |
| 2026-05-16 | RYR18ZU | PMI → BOH | May 16, 22:30 UTC | May 16, 22:40 UTC | 10m |
| 2026-05-16 | RYR8086 | - | May 16, 09:16 UTC | May 16, 09:31 UTC | 15m |
| 2026-05-15 | RYR3177 | SNN → OPO | May 15, 22:10 UTC | May 15, 22:20 UTC | 10m |
| 2026-05-15 | RYR3DK | BHX → ZAD | May 15, 00:40 UTC | May 15, 00:55 UTC | 15m |
| 2026-05-12 | RYR7CV | HHN → STN | May 12, 11:00 UTC | May 13, 04:40 UTC | 17h 40m |
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.