sensors Mode-S transponder
400F63
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to G-ECLN · AIRBUS A-340-600
- Hex
- 400F63
- Octal
- 20007543
- Decimal
- 4,198,243
- Country
- GB
- Tail
- G-ECLN
- Type
- A346
- Flights observed
- 22
- Distinct callsigns
- 3
- Country
- GB
- Last broadcast
- 23d ago
Last known position
Country allocation
The ICAO 24-bit address 400F63 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 3 distinct
Recent flights last 22
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-05 | URO802 | - | May 5, 14:50 UTC | May 6, 08:50 UTC | 18h 0m |
| 2026-05-05 | URO802 | - | May 5, 12:50 UTC | May 6, 08:50 UTC | 20h 0m |
| 2026-05-03 | URO803 | - | May 3, 17:20 UTC | May 4, 12:35 UTC | 19h 15m |
| 2026-05-03 | URO803 | - | May 3, 14:50 UTC | May 4, 12:35 UTC | 21h 45m |
| 2026-05-03 | URO803 | MME → MME | May 3, 13:10 UTC | May 4, 12:35 UTC | 23h 25m |
| 2026-04-30 | URO802 | - | Apr 30, 14:50 UTC | May 1, 09:45 UTC | 18h 55m |
| 2026-04-30 | URO802 | - | Apr 30, 13:35 UTC | May 1, 09:45 UTC | 20h 10m |
| 2026-04-27 | URO803 | - | Apr 27, 07:55 UTC | Apr 27, 13:25 UTC | 5h 30m |
| 2026-04-26 | URO803 | - | Apr 26, 16:50 UTC | Apr 27, 13:25 UTC | 20h 35m |
| 2026-04-26 | URO803 | - | Apr 26, 14:50 UTC | Apr 27, 13:25 UTC | 22h 35m |
| 2026-04-26 | URO803 | - | Apr 26, 12:50 UTC | Apr 27, 12:45 UTC | 23h 55m |
| 2026-04-26 | URO802 | - | Apr 26, 12:10 UTC | Apr 27, 10:45 UTC | 22h 35m |
| 2026-04-24 | URO803 | - | Apr 24, 08:15 UTC | Apr 24, 13:50 UTC | 5h 35m |
| 2026-04-23 | URO803 | - | Apr 23, 16:50 UTC | Apr 24, 13:50 UTC | 21h 0m |
| 2026-04-23 | URO803 | - | Apr 23, 14:50 UTC | Apr 24, 13:50 UTC | 23h 0m |
| 2026-04-23 | URO802 | - | Apr 23, 12:50 UTC | Apr 24, 12:45 UTC | 23h 55m |
| 2026-04-23 | URO802 | - | Apr 23, 12:35 UTC | Apr 24, 10:45 UTC | 22h 10m |
| 2026-04-21 | URO803 | - | Apr 21, 15:45 UTC | Apr 21, 21:05 UTC | 5h 20m |
| 2026-04-20 | URO802 | - | Apr 20, 13:25 UTC | Apr 20, 16:25 UTC | 3h 0m |
| 2026-04-13 | URO101P | - | Apr 13, 12:20 UTC | Apr 13, 12:25 UTC | 5m |
| 2026-04-13 | URO101P | - | Apr 13, 11:55 UTC | Apr 13, 12:25 UTC | 30m |
| 2026-04-13 | URO101P | - | Apr 13, 11:35 UTC | Apr 13, 12:15 UTC | 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.
Prefer a tail-number view? See the G-ECLN page for operator, model, and routing details .