sensors Mode-S transponder
424A72
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to TWR
- Hex
- 424A72
- Octal
- 20445162
- Decimal
- 4,344,434
- Country
- GB
- Tail
- TWR
- Type
- TWR
- Flights observed
- 58
- Distinct callsigns
- 1
- Country
- GB
- Last broadcast
- 10d ago
Last known position
Country allocation
The ICAO 24-bit address 424A72 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 1 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| ID424A72 | - | 58 | 2026-06-23 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-23 | ID424A72 | - | Jun 23, 08:35 UTC | Jun 24, 02:54 UTC | 18h 20m |
| 2026-06-23 | ID424A72 | - | Jun 23, 06:34 UTC | Jun 24, 02:54 UTC | 20h 20m |
| 2026-06-23 | ID424A72 | - | Jun 23, 02:34 UTC | Jun 24, 02:30 UTC | 23h 55m |
| 2026-06-23 | ID424A72 | - | Jun 23, 00:35 UTC | Jun 24, 00:30 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 22:34 UTC | Jun 23, 22:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 20:34 UTC | Jun 23, 20:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 18:35 UTC | Jun 23, 18:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 14:34 UTC | Jun 23, 14:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 12:34 UTC | Jun 23, 12:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 10:34 UTC | Jun 23, 10:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 08:35 UTC | Jun 23, 08:30 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 06:35 UTC | Jun 23, 06:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 04:34 UTC | Jun 23, 04:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 02:34 UTC | Jun 23, 02:29 UTC | 23h 55m |
| 2026-06-22 | ID424A72 | - | Jun 22, 00:34 UTC | Jun 23, 00:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 22:34 UTC | Jun 22, 22:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 20:34 UTC | Jun 22, 20:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 18:35 UTC | Jun 22, 18:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 16:34 UTC | Jun 22, 16:29 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 14:34 UTC | Jun 22, 14:29 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 12:35 UTC | Jun 22, 12:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 10:34 UTC | Jun 22, 10:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 08:35 UTC | Jun 22, 08:29 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 06:35 UTC | Jun 22, 06:29 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 04:34 UTC | Jun 22, 04:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 02:35 UTC | Jun 22, 02:30 UTC | 23h 55m |
| 2026-06-21 | ID424A72 | - | Jun 21, 01:25 UTC | Jun 22, 00:29 UTC | 23h 5m |
| 2026-06-11 | ID424A72 | - | Jun 11, 04:35 UTC | Jun 12, 00:30 UTC | 19h 55m |
| 2026-06-11 | ID424A72 | - | Jun 11, 02:35 UTC | Jun 12, 00:30 UTC | 21h 55m |
| 2026-06-11 | ID424A72 | - | Jun 11, 00:35 UTC | Jun 12, 00:30 UTC | 23h 55m |
| 2026-06-10 | ID424A72 | - | Jun 10, 22:35 UTC | Jun 11, 22:30 UTC | 23h 55m |
| 2026-06-10 | ID424A72 | - | Jun 10, 20:35 UTC | Jun 11, 20:30 UTC | 23h 55m |
| 2026-06-10 | ID424A72 | - | Jun 10, 18:35 UTC | Jun 11, 18:30 UTC | 23h 55m |
| 2026-06-10 | ID424A72 | - | Jun 10, 16:35 UTC | Jun 11, 16:30 UTC | 23h 55m |
| 2026-06-10 | ID424A72 | - | Jun 10, 14:35 UTC | Jun 11, 14:30 UTC | 23h 55m |
| 2026-06-10 | ID424A72 | - | Jun 10, 14:25 UTC | Jun 11, 12:30 UTC | 22h 5m |
| 2026-05-18 | ID424A72 | - | May 18, 06:35 UTC | May 19, 02:20 UTC | 19h 44m |
| 2026-05-18 | ID424A72 | - | May 18, 04:40 UTC | May 19, 02:20 UTC | 21h 39m |
| 2026-05-18 | ID424A72 | - | May 18, 02:35 UTC | May 19, 02:20 UTC | 23h 44m |
| 2026-05-18 | ID424A72 | - | May 18, 00:35 UTC | May 19, 00:30 UTC | 23h 54m |
| 2026-05-17 | ID424A72 | - | May 17, 22:35 UTC | May 18, 22:30 UTC | 23h 54m |
| 2026-05-17 | ID424A72 | - | May 17, 20:35 UTC | May 18, 20:30 UTC | 23h 54m |
| 2026-05-17 | ID424A72 | - | May 17, 18:35 UTC | May 18, 18:30 UTC | 23h 54m |
| 2026-05-17 | ID424A72 | - | May 17, 16:35 UTC | May 18, 16:30 UTC | 23h 55m |
| 2026-05-17 | ID424A72 | - | May 17, 14:35 UTC | May 18, 14:30 UTC | 23h 55m |
| 2026-05-17 | ID424A72 | - | May 17, 12:35 UTC | May 18, 12:30 UTC | 23h 55m |
| 2026-05-17 | ID424A72 | - | May 17, 10:35 UTC | May 18, 10:30 UTC | 23h 55m |
| 2026-05-17 | ID424A72 | - | May 17, 06:35 UTC | May 18, 06:25 UTC | 23h 50m |
| 2026-05-17 | ID424A72 | - | May 17, 04:35 UTC | May 18, 04:30 UTC | 23h 55m |
| 2026-05-17 | ID424A72 | - | May 17, 02:35 UTC | May 18, 02:30 UTC | 23h 55m |
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 TWR page for operator, model, and routing details .