sensors Mode-S transponder
4002C1
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to VP-CFZ · GULFSTREAM 5
- Hex
- 4002C1
- Octal
- 20001301
- Decimal
- 4,195,009
- Country
- GB
- Tail
- VP-CFZ
- Type
- GLF5
- Flights observed
- 12
- Distinct callsigns
- 1
- Country
- GB
- Last broadcast
- Jul 25, 15:05 UTC
Last known position
Country allocation
The ICAO 24-bit address 4002C1 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 |
|---|---|---|---|
| VPCFZ | - | 12 | 2026-07-25 |
Recent flights last 12
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-25 | VPCFZ | - | Jul 25, 13:35 UTC | Jul 25, 15:05 UTC | 1h 30m |
| 2026-07-25 | VPCFZ | - | Jul 25, 05:45 UTC | Jul 25, 06:00 UTC | 15m |
| 2026-07-18 | VPCFZ | - | Jul 18, 02:14 UTC | Jul 18, 02:29 UTC | 15m |
| 2026-07-17 | VPCFZ | - | Jul 17, 11:35 UTC | Jul 17, 13:29 UTC | 1h 55m |
| 2026-07-15 | VPCFZ | - | Jul 15, 14:00 UTC | Jul 15, 14:30 UTC | 30m |
| 2026-06-07 | VPCFZ | - | Jun 7, 13:15 UTC | Jun 7, 13:35 UTC | 20m |
| 2026-06-06 | VPCFZ | - | Jun 6, 05:05 UTC | Jun 6, 16:20 UTC | 11h 15m |
| 2026-06-01 | VPCFZ | LRD → LGB | Jun 1, 13:10 UTC | Jun 1, 15:50 UTC | 2h 40m |
| 2026-06-01 | VPCFZ | - | Jun 1, 01:30 UTC | Jun 1, 11:50 UTC | 10h 20m |
| 2026-05-28 | VPCFZ | SAV → EZE | May 28, 13:45 UTC | May 28, 23:30 UTC | 9h 45m |
| 2026-05-27 | VPCFZ | SAV → SAV | May 27, 14:45 UTC | May 27, 17:25 UTC | 2h 40m |
| 2026-05-03 | VPCFZ | - | May 3, 11:20 UTC | May 3, 21:24 UTC | 10h 5m |
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 VP-CFZ page for operator, model, and routing details .