sensors Mode-S transponder
4066DA
ICAO 24-bit transponder address · allocated to United Kingdom
- Hex
- 4066DA
- Octal
- 20063332
- Decimal
- 4,220,634
- Country
- GB
- Flights observed
- 21
- Distinct callsigns
- 10
- Country
- GB
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 4066DA 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 10 distinct
Recent flights last 21
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-15 | EXS14C | - | Jul 15, 15:10 UTC | Jul 15, 15:20 UTC | 10m |
| 2026-07-15 | - | - | Jul 15, 08:15 UTC | Jul 15, 08:25 UTC | 10m |
| 2026-07-13 | - | - | Jul 13, 16:30 UTC | Jul 13, 16:45 UTC | 15m |
| 2026-07-12 | EXS628 | - | Jul 12, 12:25 UTC | Jul 12, 12:40 UTC | 15m |
| 2026-07-07 | EXS16V | - | Jul 7, 00:15 UTC | Jul 7, 00:25 UTC | 10m |
| 2026-07-06 | - | - | Jul 6, 15:40 UTC | Jul 6, 15:50 UTC | 10m |
| 2026-07-05 | EXS5FR | - | Jul 5, 05:50 UTC | Jul 5, 10:25 UTC | 4h 35m |
| 2026-07-02 | - | - | Jul 2, 17:35 UTC | Jul 2, 17:45 UTC | 10m |
| 2026-06-29 | EXS54KM | - | Jun 29, 12:20 UTC | Jun 30, 07:45 UTC | 19h 26m |
| 2026-06-28 | EXS33WE | - | Jun 28, 15:49 UTC | Jun 29, 12:24 UTC | 20h 35m |
| 2026-06-28 | EXS33WE | - | Jun 28, 13:00 UTC | Jun 29, 12:24 UTC | 23h 25m |
| 2026-06-28 | EXS33WE | - | Jun 28, 01:10 UTC | Jun 28, 16:00 UTC | 14h 50m |
| 2026-06-26 | - | - | Jun 26, 16:44 UTC | Jun 26, 19:35 UTC | 2h 50m |
| 2026-06-21 | EXS7TQ | - | Jun 21, 17:10 UTC | Jun 21, 22:04 UTC | 4h 55m |
| 2026-06-19 | EXS3KP | PMI → NCL | Jun 19, 15:34 UTC | Jun 19, 20:55 UTC | 5h 20m |
| 2026-06-18 | EXS11AF | MAH → NCL | Jun 18, 22:35 UTC | Jun 19, 20:55 UTC | 22h 19m |
| 2026-06-15 | - | - | Jun 15, 16:45 UTC | Jun 15, 16:55 UTC | 10m |
| 2026-06-13 | - | - | Jun 13, 06:35 UTC | Jun 13, 06:45 UTC | 10m |
| 2026-06-05 | EXS7TQ | NCL → KGS | Jun 5, 20:50 UTC | Jun 6, 10:55 UTC | 14h 5m |
| 2026-05-16 | - | - | May 16, 15:20 UTC | May 17, 06:45 UTC | 15h 25m |
| 2026-05-15 | EXS9LD | LBA → AYT | May 15, 13:35 UTC | May 15, 13:45 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.