sensors Mode-S transponder
40039E
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to VQ-TCC · DE HAVILLAND DHC-6 Twin Otter
- Hex
- 40039E
- Octal
- 20001636
- Decimal
- 4,195,230
- Country
- GB
- Tail
- VQ-TCC
- Type
- DHC6
- Flights observed
- 23
- Distinct callsigns
- 13
- Country
- GB
- Last broadcast
- 19d ago
Last known position
Country allocation
The ICAO 24-bit address 40039E 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 13 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| IWY161 | - | 3 | 2026-06-17 |
| IWY122 | - | 3 | 2026-06-15 |
| JY131 | - | 2 | 2026-06-05 |
| IWY998 | Interisland Airways Limited | 2 | 2026-06-16 |
| IWY152 | Interisland Airways Limited | 2 | 2026-06-19 |
| IWY131 | Interisland Airways Limited | 2 | 2026-06-03 |
| IWY121 | - | 2 | 2026-06-15 |
| JY161 | - | 1 | 2026-06-06 |
| JY122 | - | 1 | 2026-05-21 |
| JY121 | - | 1 | 2026-05-24 |
| JY112 | - | 1 | 2026-06-06 |
| IWY943 | Interisland Airways Limited | 1 | 2026-06-07 |
| IWY171 | - | 1 | 2026-06-15 |
Recent flights last 23
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-19 | IWY152 | GDT → PLS | Jun 19, 20:49 UTC | Jun 19, 21:24 UTC | 35m |
| 2026-06-18 | IWY152 | GDT → PLS | Jun 18, 20:40 UTC | Jun 18, 21:00 UTC | 20m |
| 2026-06-17 | IWY161 | - | Jun 17, 20:40 UTC | Jun 17, 21:10 UTC | 30m |
| 2026-06-16 | IWY998 | MYR → AMA | Jun 16, 14:15 UTC | Jun 16, 15:15 UTC | 1h 0m |
| 2026-06-15 | IWY171 | - | Jun 15, 22:25 UTC | Jun 15, 22:59 UTC | 35m |
| 2026-06-15 | IWY122 | - | Jun 15, 14:34 UTC | Jun 15, 15:10 UTC | 35m |
| 2026-06-15 | IWY121 | - | Jun 15, 13:15 UTC | Jun 15, 13:45 UTC | 30m |
| 2026-06-11 | IWY121 | - | Jun 11, 13:15 UTC | Jun 11, 13:45 UTC | 30m |
| 2026-06-10 | IWY161 | - | Jun 10, 20:45 UTC | Jun 10, 21:15 UTC | 30m |
| 2026-06-09 | IWY998 | MYR → AMA | Jun 9, 20:10 UTC | Jun 9, 21:25 UTC | 1h 15m |
| 2026-06-07 | IWY943 | PLS → SLX | Jun 7, 17:15 UTC | Jun 7, 17:45 UTC | 30m |
| 2026-06-06 | JY161 | - | Jun 6, 22:05 UTC | Jun 6, 22:34 UTC | 30m |
| 2026-06-06 | JY112 | - | Jun 6, 12:54 UTC | Jun 6, 13:25 UTC | 30m |
| 2026-06-05 | JY131 | - | Jun 5, 13:25 UTC | Jun 5, 14:00 UTC | 35m |
| 2026-06-03 | IWY131 | PLS → GDT | Jun 3, 13:25 UTC | Jun 3, 14:00 UTC | 35m |
| 2026-06-02 | IWY122 | - | Jun 2, 13:05 UTC | Jun 2, 13:45 UTC | 40m |
| 2026-06-01 | IWY131 | PLS → GDT | Jun 1, 13:25 UTC | Jun 1, 14:00 UTC | 35m |
| 2026-05-31 | IWY122 | - | May 31, 13:25 UTC | May 31, 14:00 UTC | 35m |
| 2026-05-25 | JY131 | - | May 25, 13:10 UTC | May 25, 13:45 UTC | 35m |
| 2026-05-24 | JY121 | - | May 24, 12:55 UTC | May 24, 13:30 UTC | 35m |
| 2026-05-21 | JY122 | - | May 21, 13:30 UTC | May 21, 14:00 UTC | 30m |
| 2026-05-15 | IWY161 | - | May 15, 21:00 UTC | May 15, 21:35 UTC | 35m |
| 2026-04-16 | - | - | Apr 16, 20:45 UTC | Apr 16, 21:00 UTC | 15m |
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 VQ-TCC page for operator, model, and routing details .