sensors Mode-S transponder
400F0B
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to G-ECLC · AIRBUS A-340-600
- Hex
- 400F0B
- Octal
- 20007413
- Decimal
- 4,198,155
- Country
- GB
- Tail
- G-ECLC
- Type
- A346
- Flights observed
- 28
- Distinct callsigns
- 6
- Country
- GB
- Last broadcast
- 10d ago
Last known position
Country allocation
The ICAO 24-bit address 400F0B 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 6 distinct
Recent flights last 28
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-19 | URO100P | BOH → BOH | May 19, 18:10 UTC | May 19, 19:15 UTC | 1h 5m |
| 2026-05-19 | URO971 | - | May 19, 07:55 UTC | May 19, 12:30 UTC | 4h 35m |
| 2026-05-16 | URO970 | - | May 16, 20:35 UTC | May 17, 01:10 UTC | 4h 35m |
| 2026-05-16 | URO971 | - | May 16, 09:56 UTC | May 16, 14:31 UTC | 4h 35m |
| 2026-05-15 | URO971 | - | May 15, 10:50 UTC | May 16, 10:46 UTC | 23h 55m |
| 2026-05-15 | URO970 | - | May 15, 06:50 UTC | May 15, 10:55 UTC | 4h 5m |
| 2026-05-14 | URO971 | - | May 14, 12:05 UTC | May 14, 16:25 UTC | 4h 20m |
| 2026-05-07 | URO970 | - | May 7, 19:15 UTC | May 7, 23:19 UTC | 4h 5m |
| 2026-05-07 | URO971 | - | May 7, 09:05 UTC | May 7, 10:15 UTC | 1h 10m |
| 2026-05-03 | URO970 | - | May 3, 20:15 UTC | May 4, 00:34 UTC | 4h 20m |
| 2026-05-03 | URO971 | - | May 3, 08:35 UTC | May 3, 13:00 UTC | 4h 25m |
| 2026-05-02 | URO971 | TZX → MST | May 2, 17:30 UTC | May 3, 13:00 UTC | 19h 29m |
| 2026-05-02 | URO971 | - | May 2, 14:50 UTC | May 3, 13:00 UTC | 22h 9m |
| 2026-05-02 | URO973 | - | May 2, 13:30 UTC | May 3, 12:45 UTC | 23h 14m |
| 2026-04-29 | URO803 | - | Apr 29, 07:40 UTC | Apr 29, 13:05 UTC | 5h 26m |
| 2026-04-28 | URO803 | - | Apr 28, 16:50 UTC | Apr 29, 13:05 UTC | 20h 15m |
| 2026-04-28 | URO803 | - | Apr 28, 14:50 UTC | Apr 29, 13:05 UTC | 22h 16m |
| 2026-04-28 | URO802 | - | Apr 28, 12:50 UTC | Apr 29, 12:45 UTC | 23h 56m |
| 2026-04-26 | URO803 | - | Apr 26, 08:10 UTC | Apr 26, 13:30 UTC | 5h 20m |
| 2026-04-25 | URO803 | - | Apr 25, 16:50 UTC | Apr 26, 13:30 UTC | 20h 40m |
| 2026-04-25 | URO803 | - | Apr 25, 14:50 UTC | Apr 26, 13:30 UTC | 22h 40m |
| 2026-04-25 | URO802 | - | Apr 25, 12:50 UTC | Apr 26, 12:45 UTC | 23h 55m |
| 2026-04-25 | URO802 | - | Apr 25, 12:40 UTC | Apr 26, 10:45 UTC | 22h 5m |
| 2026-04-22 | URO803 | - | Apr 22, 15:50 UTC | Apr 22, 21:05 UTC | 5h 15m |
| 2026-04-21 | URO803 | - | Apr 21, 17:40 UTC | Apr 22, 16:45 UTC | 23h 5m |
| 2026-04-21 | URO802 | - | Apr 21, 13:20 UTC | Apr 21, 18:10 UTC | 4h 50m |
| 2026-04-19 | URO802 | - | Apr 19, 13:00 UTC | Apr 20, 08:45 UTC | 19h 45m |
| 2026-04-13 | URO100P | BOH → BOH | Apr 13, 09:50 UTC | Apr 13, 10:40 UTC | 50m |
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-ECLC page for operator, model, and routing details .