sensors Mode-S transponder
4CAC1B
ICAO 24-bit transponder address · allocated to Ireland
Currently assigned to EI-KHE · EMBRAER ERJ-190-300
- Hex
- 4CAC1B
- Octal
- 23126033
- Decimal
- 5,024,795
- Country
- IE
- Tail
- EI-KHE
- Type
- E290
- Flights observed
- 27
- Distinct callsigns
- 16
- Country
- IE
- Last broadcast
- 1d ago
Last known position
Country allocation
The ICAO 24-bit address 4CAC1B 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 |
|---|---|---|---|
| RYR77FW | - | 2 | 2026-07-12 |
| RYR6KZ | - | 2 | 2026-07-11 |
| RYR55FV | - | 2 | 2026-07-08 |
| RYR8PK | - | 1 | 2026-06-23 |
| RYR8958 | Ryanair | 1 | 2026-06-19 |
| RYR7UL | Ryanair | 1 | 2026-06-24 |
| RYR6BK | Ryanair | 1 | 2026-05-23 |
| RYR61MJ | - | 1 | 2026-07-12 |
| RYR61BH | Ryanair | 1 | 2026-06-20 |
| RYR5WL | - | 1 | 2026-06-22 |
| RYR3VH | Ryanair | 1 | 2026-06-08 |
| RYR39LG | - | 1 | 2026-06-29 |
| RYR3177 | Ryanair | 1 | 2026-06-26 |
| RYR2EY | - | 1 | 2026-06-23 |
| RYR25UZ | - | 1 | 2026-07-09 |
| RYR1665 | - | 1 | 2026-07-07 |
Recent flights last 27
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-12 | RYR77FW | - | Jul 12, 18:50 UTC | Jul 12, 19:05 UTC | 15m |
| 2026-07-12 | RYR61MJ | - | Jul 12, 06:20 UTC | Jul 12, 13:30 UTC | 7h 10m |
| 2026-07-11 | RYR6KZ | - | Jul 11, 18:15 UTC | Jul 11, 22:45 UTC | 4h 30m |
| 2026-07-09 | RYR25UZ | - | Jul 9, 20:20 UTC | Jul 9, 20:30 UTC | 10m |
| 2026-07-08 | RYR55FV | - | Jul 8, 21:50 UTC | Jul 8, 22:00 UTC | 10m |
| 2026-07-07 | RYR1665 | - | Jul 7, 23:05 UTC | Jul 7, 23:25 UTC | 20m |
| 2026-07-05 | RYR77FW | - | Jul 5, 18:10 UTC | Jul 6, 05:35 UTC | 11h 25m |
| 2026-07-05 | RYR55FV | - | Jul 5, 07:20 UTC | Jul 5, 16:50 UTC | 9h 30m |
| 2026-07-04 | RYR6KZ | - | Jul 4, 17:20 UTC | Jul 4, 21:35 UTC | 4h 15m |
| 2026-06-30 | - | - | Jun 30, 22:50 UTC | Jun 30, 23:00 UTC | 10m |
| 2026-06-29 | RYR39LG | - | Jun 29, 22:44 UTC | Jun 29, 22:55 UTC | 10m |
| 2026-06-28 | - | - | Jun 28, 21:50 UTC | Jun 28, 21:59 UTC | 10m |
| 2026-06-26 | RYR3177 | SNN → OPO | Jun 26, 07:55 UTC | Jun 26, 22:10 UTC | 14h 15m |
| 2026-06-24 | - | - | Jun 24, 23:24 UTC | Jun 24, 23:34 UTC | 10m |
| 2026-06-24 | RYR7UL | MAD → CRL | Jun 24, 13:24 UTC | Jun 24, 13:34 UTC | 10m |
| 2026-06-23 | RYR2EY | - | Jun 23, 22:49 UTC | Jun 23, 23:05 UTC | 15m |
| 2026-06-23 | RYR8PK | - | Jun 23, 14:55 UTC | Jun 23, 15:04 UTC | 10m |
| 2026-06-22 | RYR5WL | - | Jun 22, 06:25 UTC | Jun 22, 12:10 UTC | 5h 45m |
| 2026-06-21 | - | - | Jun 21, 07:55 UTC | Jun 21, 21:19 UTC | 13h 25m |
| 2026-06-20 | RYR61BH | ALC → GOT | Jun 20, 07:19 UTC | Jun 20, 17:29 UTC | 10h 10m |
| 2026-06-20 | - | - | Jun 20, 00:09 UTC | Jun 20, 00:19 UTC | 10m |
| 2026-06-19 | RYR8958 | ARN → MLA | Jun 19, 20:24 UTC | Jun 19, 20:40 UTC | 15m |
| 2026-06-19 | - | - | Jun 19, 16:59 UTC | Jun 19, 17:14 UTC | 15m |
| 2026-06-13 | - | - | Jun 13, 19:25 UTC | Jun 14, 18:30 UTC | 23h 5m |
| 2026-06-08 | RYR3VH | BGY → PRG | Jun 8, 18:50 UTC | Jun 8, 19:05 UTC | 15m |
| 2026-06-02 | - | - | Jun 2, 14:45 UTC | Jun 2, 14:55 UTC | 10m |
| 2026-05-23 | RYR6BK | LTN → NOC | May 23, 14:30 UTC | May 23, 14:40 UTC | 10m |
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-KHE page for operator, model, and routing details .