sensors Mode-S transponder
406B11
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to G-CIDP · SONEX AIRCRAFT Sonex
- Hex
- 406B11
- Octal
- 20065421
- Decimal
- 4,221,713
- Country
- GB
- Tail
- G-CIDP
- Type
- SONX
- Flights observed
- 22
- Distinct callsigns
- 8
- Country
- GB
- Last broadcast
- Jul 25, 21:20 UTC
Last known position
Country allocation
The ICAO 24-bit address 406B11 falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom 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 8 distinct
Recent flights last 22
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | EZY87VU | BFS → NCE | Jul 25, 17:05 UTC | Jul 25, 21:20 UTC | 4h 15m |
| 2026-07-21 | - | - | Jul 21, 22:05 UTC | Jul 21, 22:20 UTC | 15m |
| 2026-07-20 | EZY786R | - | Jul 20, 08:10 UTC | Jul 20, 12:00 UTC | 3h 50m |
| 2026-07-18 | - | - | Jul 18, 16:15 UTC | Jul 18, 16:25 UTC | 10m |
| 2026-07-14 | - | - | Jul 14, 23:35 UTC | Jul 15, 14:20 UTC | 14h 45m |
| 2026-07-14 | - | - | Jul 14, 17:15 UTC | Jul 15, 14:20 UTC | 21h 4m |
| 2026-07-13 | - | - | Jul 13, 21:40 UTC | Jul 14, 17:20 UTC | 19h 40m |
| 2026-07-12 | EZY63GN | - | Jul 12, 07:10 UTC | Jul 12, 17:05 UTC | 9h 55m |
| 2026-07-07 | - | - | Jul 7, 13:15 UTC | Jul 7, 13:30 UTC | 15m |
| 2026-07-06 | - | - | Jul 6, 11:50 UTC | Jul 6, 12:00 UTC | 10m |
| 2026-07-06 | EZY47UP | - | Jul 6, 06:20 UTC | Jul 6, 06:30 UTC | 10m |
| 2026-06-30 | EZY47UP | - | Jun 30, 06:00 UTC | Jun 30, 06:10 UTC | 10m |
| 2026-06-28 | - | - | Jun 28, 12:05 UTC | Jun 28, 12:15 UTC | 10m |
| 2026-06-28 | - | - | Jun 28, 10:50 UTC | Jun 28, 11:00 UTC | 10m |
| 2026-06-28 | - | - | Jun 28, 08:05 UTC | Jun 28, 08:14 UTC | 10m |
| 2026-06-26 | - | - | Jun 26, 20:34 UTC | Jun 26, 20:44 UTC | 10m |
| 2026-06-25 | - | - | Jun 25, 15:54 UTC | Jun 25, 16:05 UTC | 10m |
| 2026-06-25 | EZY51NU | - | Jun 25, 07:39 UTC | Jun 25, 07:49 UTC | 10m |
| 2026-06-16 | GCIDP | - | Jun 16, 10:15 UTC | Jun 16, 10:49 UTC | 35m |
| 2026-06-07 | EZY27QE | - | Jun 7, 06:55 UTC | Jun 7, 14:00 UTC | 7h 5m |
| 2026-05-18 | EZY87XA | BRS → KRK | May 18, 07:00 UTC | May 18, 21:15 UTC | 14h 14m |
| 2026-05-13 | - | - | May 13, 22:25 UTC | May 13, 22:35 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 G-CIDP page for operator, model, and routing details .