sensors Mode-S transponder
407453
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to G-CKRK · GUIMBAL G-2 Cabri
- Hex
- 407453
- Octal
- 20072123
- Decimal
- 4,224,083
- Country
- GB
- Tail
- G-CKRK
- Type
- G2CA
- Flights observed
- 50
- Distinct callsigns
- 1
- Country
- GB
- Last broadcast
- 13h ago
Last known position
Country allocation
The ICAO 24-bit address 407453 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 |
|---|---|---|---|
| GCKRK | - | 50 | 2026-07-17 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | GCKRK | - | Jul 17, 12:55 UTC | Jul 17, 13:40 UTC | 45m |
| 2026-07-17 | GCKRK | - | Jul 17, 10:40 UTC | Jul 17, 10:55 UTC | 15m |
| 2026-07-16 | GCKRK | - | Jul 16, 13:54 UTC | Jul 16, 14:55 UTC | 1h 0m |
| 2026-07-15 | GCKRK | - | Jul 15, 12:55 UTC | Jul 15, 13:40 UTC | 45m |
| 2026-07-15 | GCKRK | - | Jul 15, 12:00 UTC | Jul 15, 12:15 UTC | 15m |
| 2026-07-14 | GCKRK | - | Jul 14, 11:45 UTC | Jul 14, 12:40 UTC | 55m |
| 2026-07-12 | GCKRK | - | Jul 12, 09:20 UTC | Jul 12, 10:10 UTC | 50m |
| 2026-07-10 | GCKRK | - | Jul 10, 13:25 UTC | Jul 10, 14:20 UTC | 55m |
| 2026-07-10 | GCKRK | - | Jul 10, 10:00 UTC | Jul 10, 10:50 UTC | 50m |
| 2026-07-09 | GCKRK | - | Jul 9, 15:05 UTC | Jul 9, 15:30 UTC | 25m |
| 2026-07-06 | GCKRK | - | Jul 6, 14:55 UTC | Jul 6, 15:50 UTC | 55m |
| 2026-07-05 | GCKRK | - | Jul 5, 09:40 UTC | Jul 5, 10:50 UTC | 1h 10m |
| 2026-07-02 | GCKRK | - | Jul 2, 13:15 UTC | Jul 2, 13:40 UTC | 25m |
| 2026-07-02 | GCKRK | - | Jul 2, 08:45 UTC | Jul 2, 09:40 UTC | 55m |
| 2026-06-29 | GCKRK | - | Jun 29, 09:40 UTC | Jun 29, 10:34 UTC | 55m |
| 2026-06-28 | GCKRK | - | Jun 28, 09:20 UTC | Jun 28, 10:19 UTC | 1h 0m |
| 2026-06-26 | GCKRK | - | Jun 26, 10:20 UTC | Jun 26, 10:39 UTC | 20m |
| 2026-06-23 | GCKRK | - | Jun 23, 12:25 UTC | Jun 23, 12:45 UTC | 20m |
| 2026-06-23 | GCKRK | - | Jun 23, 10:39 UTC | Jun 23, 11:29 UTC | 50m |
| 2026-06-22 | GCKRK | - | Jun 22, 09:14 UTC | Jun 22, 09:49 UTC | 35m |
| 2026-06-18 | GCKRK | - | Jun 18, 09:30 UTC | Jun 18, 10:20 UTC | 50m |
| 2026-06-14 | GCKRK | - | Jun 14, 11:45 UTC | Jun 14, 12:10 UTC | 25m |
| 2026-06-14 | GCKRK | - | Jun 14, 08:55 UTC | Jun 14, 09:50 UTC | 55m |
| 2026-06-12 | GCKRK | - | Jun 12, 12:55 UTC | Jun 12, 13:45 UTC | 50m |
| 2026-06-11 | GCKRK | - | Jun 11, 08:55 UTC | Jun 11, 09:45 UTC | 50m |
| 2026-06-09 | GCKRK | - | Jun 9, 11:00 UTC | Jun 9, 11:55 UTC | 55m |
| 2026-06-07 | GCKRK | - | Jun 7, 13:25 UTC | Jun 7, 14:05 UTC | 40m |
| 2026-06-05 | GCKRK | - | Jun 5, 13:15 UTC | Jun 5, 14:05 UTC | 50m |
| 2026-06-05 | GCKRK | - | Jun 5, 11:15 UTC | Jun 5, 12:10 UTC | 55m |
| 2026-05-31 | GCKRK | - | May 31, 08:50 UTC | May 31, 09:45 UTC | 55m |
| 2026-05-28 | GCKRK | - | May 28, 13:25 UTC | May 28, 14:25 UTC | 1h 0m |
| 2026-05-28 | GCKRK | - | May 28, 09:10 UTC | May 28, 09:55 UTC | 45m |
| 2026-05-24 | GCKRK | - | May 24, 10:55 UTC | May 24, 11:50 UTC | 55m |
| 2026-05-24 | GCKRK | - | May 24, 09:00 UTC | May 24, 09:40 UTC | 40m |
| 2026-05-22 | GCKRK | - | May 22, 14:25 UTC | May 22, 14:45 UTC | 20m |
| 2026-05-22 | GCKRK | - | May 22, 12:45 UTC | May 22, 13:35 UTC | 50m |
| 2026-05-18 | GCKRK | - | May 18, 11:05 UTC | May 18, 11:50 UTC | 45m |
| 2026-05-17 | GCKRK | - | May 17, 15:15 UTC | May 17, 16:05 UTC | 50m |
| 2026-05-17 | GCKRK | - | May 17, 08:50 UTC | May 17, 09:40 UTC | 50m |
| 2026-05-15 | GCKRK | - | May 15, 13:15 UTC | May 15, 14:10 UTC | 55m |
| 2026-05-14 | GCKRK | - | May 14, 10:40 UTC | May 14, 11:30 UTC | 50m |
| 2026-05-01 | GCKRK | - | May 1, 10:45 UTC | May 1, 11:15 UTC | 30m |
| 2026-04-30 | GCKRK | - | Apr 30, 10:40 UTC | Apr 30, 11:30 UTC | 50m |
| 2026-04-30 | GCKRK | - | Apr 30, 08:10 UTC | Apr 30, 08:50 UTC | 40m |
| 2026-04-28 | GCKRK | - | Apr 28, 13:30 UTC | Apr 28, 13:40 UTC | 10m |
| 2026-04-17 | GCKRK | - | Apr 17, 13:20 UTC | Apr 17, 14:00 UTC | 40m |
| 2026-04-16 | GCKRK | - | Apr 16, 12:39 UTC | Apr 16, 13:00 UTC | 20m |
| 2026-04-14 | GCKRK | - | Apr 14, 13:35 UTC | Apr 14, 14:20 UTC | 45m |
| 2026-04-13 | GCKRK | - | Apr 13, 12:20 UTC | Apr 13, 12:50 UTC | 30m |
| 2026-04-13 | GCKRK | - | Apr 13, 12:05 UTC | Apr 13, 12:15 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-CKRK page for operator, model, and routing details .