sensors Mode-S transponder
51108D
ICAO 24-bit transponder address · allocated to Estonia
Currently assigned to ES-PWC · AGUSTA AW-139
- Hex
- 51108D
- Octal
- 24210215
- Decimal
- 5,312,653
- Country
- EE
- Tail
- ES-PWC
- Type
- A139
- Flights observed
- 94
- Distinct callsigns
- 1
- Country
- EE
- Last broadcast
- 7d ago
Last known position
Country allocation
The ICAO 24-bit address 51108D falls within the block assigned to Estonia (EE) by ICAO Annex 10, Volume III. Every aircraft registered in Estonia 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 |
|---|---|---|---|
| ESPWC | - | 94 | 2026-07-07 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-07 | ESPWC | - | Jul 7, 15:35 UTC | Jul 7, 16:00 UTC | 25m |
| 2026-07-07 | ESPWC | - | Jul 7, 14:25 UTC | Jul 7, 14:45 UTC | 20m |
| 2026-07-07 | ESPWC | - | Jul 7, 13:30 UTC | Jul 7, 13:50 UTC | 20m |
| 2026-07-07 | ESPWC | - | Jul 7, 11:55 UTC | Jul 7, 12:10 UTC | 15m |
| 2026-07-06 | ESPWC | - | Jul 6, 08:40 UTC | Jul 6, 09:55 UTC | 1h 15m |
| 2026-06-26 | ESPWC | - | Jun 26, 01:05 UTC | Jun 26, 01:24 UTC | 20m |
| 2026-06-25 | ESPWC | - | Jun 25, 23:09 UTC | Jun 25, 23:24 UTC | 15m |
| 2026-06-22 | ESPWC | - | Jun 22, 21:54 UTC | Jun 22, 23:14 UTC | 1h 20m |
| 2026-06-16 | ESPWC | TLL → TLL | Jun 16, 23:20 UTC | Jun 16, 23:25 UTC | 5m |
| 2026-06-15 | ESPWC | - | Jun 15, 21:35 UTC | Jun 15, 22:00 UTC | 25m |
| 2026-06-15 | ESPWC | - | Jun 15, 20:15 UTC | Jun 15, 20:54 UTC | 40m |
| 2026-06-13 | ESPWC | - | Jun 13, 00:40 UTC | Jun 13, 01:05 UTC | 25m |
| 2026-06-12 | ESPWC | - | Jun 12, 23:40 UTC | Jun 13, 00:05 UTC | 25m |
| 2026-06-12 | ESPWC | TLL → TLL | Jun 12, 12:00 UTC | Jun 12, 13:00 UTC | 1h 0m |
| 2026-06-10 | ESPWC | TLL → TLL | Jun 10, 13:30 UTC | Jun 10, 13:50 UTC | 20m |
| 2026-06-08 | ESPWC | TLL → TLL | Jun 8, 21:20 UTC | Jun 8, 22:20 UTC | 1h 0m |
| 2026-06-07 | ESPWC | TLL → TLL | Jun 7, 20:05 UTC | Jun 7, 21:40 UTC | 1h 35m |
| 2026-06-06 | ESPWC | - | Jun 6, 11:05 UTC | Jun 6, 12:10 UTC | 1h 5m |
| 2026-06-04 | ESPWC | - | Jun 4, 17:20 UTC | Jun 4, 17:45 UTC | 25m |
| 2026-06-04 | ESPWC | - | Jun 4, 16:00 UTC | Jun 4, 16:20 UTC | 20m |
| 2026-06-03 | ESPWC | TLL → TLL | Jun 3, 12:05 UTC | Jun 3, 12:35 UTC | 30m |
| 2026-06-02 | ESPWC | - | Jun 2, 07:55 UTC | Jun 2, 08:20 UTC | 25m |
| 2026-06-02 | ESPWC | - | Jun 2, 06:40 UTC | Jun 2, 07:05 UTC | 25m |
| 2026-05-31 | ESPWC | - | May 31, 20:25 UTC | May 31, 21:45 UTC | 1h 20m |
| 2026-05-30 | ESPWC | - | May 30, 15:20 UTC | May 30, 16:15 UTC | 55m |
| 2026-05-30 | ESPWC | - | May 30, 13:25 UTC | May 30, 13:55 UTC | 30m |
| 2026-05-28 | ESPWC | TLL → TLL | May 28, 20:25 UTC | May 28, 21:05 UTC | 40m |
| 2026-05-26 | ESPWC | - | May 26, 20:34 UTC | May 26, 21:29 UTC | 55m |
| 2026-05-25 | ESPWC | TLL → TLL | May 25, 20:30 UTC | May 25, 21:35 UTC | 1h 5m |
| 2026-05-25 | ESPWC | TLL → TLL | May 25, 10:50 UTC | May 25, 11:40 UTC | 50m |
| 2026-05-24 | ESPWC | - | May 24, 20:00 UTC | May 24, 20:45 UTC | 45m |
| 2026-05-24 | ESPWC | TLL → TLL | May 24, 00:45 UTC | May 24, 01:30 UTC | 45m |
| 2026-05-20 | ESPWC | TLL → TLL | May 20, 19:40 UTC | May 20, 20:55 UTC | 1h 15m |
| 2026-05-20 | ESPWC | TLL → TLL | May 20, 12:15 UTC | May 20, 14:05 UTC | 1h 50m |
| 2026-05-19 | ESPWC | TLL → TLL | May 19, 19:50 UTC | May 19, 20:45 UTC | 55m |
| 2026-05-15 | ESPWC | CHE → TLL | May 15, 21:00 UTC | May 15, 21:55 UTC | 55m |
| 2026-05-12 | ESPWC | - | May 12, 15:40 UTC | May 12, 16:10 UTC | 30m |
| 2026-05-12 | ESPWC | - | May 12, 14:20 UTC | May 12, 14:45 UTC | 25m |
| 2026-05-11 | ESPWC | CHE → TLL | May 11, 07:55 UTC | May 11, 09:05 UTC | 1h 10m |
| 2026-05-08 | ESPWC | - | May 8, 07:55 UTC | May 8, 08:59 UTC | 1h 5m |
| 2026-05-06 | ESPWC | TLL → TLL | May 6, 12:40 UTC | May 6, 13:35 UTC | 55m |
| 2026-05-05 | ESPWC | - | May 5, 09:30 UTC | May 5, 11:10 UTC | 1h 40m |
| 2026-05-04 | ESPWC | TLL → TLL | May 4, 11:35 UTC | May 4, 12:25 UTC | 50m |
| 2026-05-03 | ESPWC | - | May 3, 08:35 UTC | May 3, 09:05 UTC | 30m |
| 2026-05-03 | ESPWC | - | May 3, 05:10 UTC | May 3, 05:25 UTC | 15m |
| 2026-05-02 | ESPWC | - | May 2, 19:15 UTC | May 2, 20:15 UTC | 1h 0m |
| 2026-05-02 | ESPWC | TLL → TLL | May 2, 08:00 UTC | May 2, 09:25 UTC | 1h 25m |
| 2026-04-30 | ESPWC | - | Apr 30, 19:20 UTC | Apr 30, 20:20 UTC | 1h 0m |
| 2026-04-30 | ESPWC | TLL → TLL | Apr 30, 12:15 UTC | Apr 30, 13:25 UTC | 1h 10m |
| 2026-04-29 | ESPWC | - | Apr 29, 10:45 UTC | Apr 29, 11:10 UTC | 25m |
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 ES-PWC page for operator, model, and routing details .