sensors Mode-S transponder
1C9DF9
ICAO 24-bit transponder address · allocated to Russia
- Hex
- 1C9DF9
- Octal
- 07116771
- Decimal
- 1,875,449
- Country
- RU
- Flights observed
- 23
- Distinct callsigns
- 1
- Country
- RU
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 1C9DF9 falls within the block assigned to Russia (RU) by ICAO Annex 10, Volume III. Every aircraft registered in Russia 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 |
|---|---|---|---|
| PPARA | - | 23 | 2026-06-04 |
Recent flights last 23
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-06-04 | PPARA | - | Jun 4, 09:55 UTC | Jun 4, 12:35 UTC | 2h 40m |
| 2026-05-31 | PPARA | - | May 31, 18:35 UTC | May 31, 21:50 UTC | 3h 15m |
| 2026-05-29 | PPARA | - | May 29, 16:45 UTC | May 29, 19:35 UTC | 2h 50m |
| 2026-05-27 | PPARA | CGH → CGH | May 27, 10:05 UTC | May 27, 20:15 UTC | 10h 10m |
| 2026-05-24 | PPARA | - | May 24, 19:10 UTC | May 24, 23:46 UTC | 4h 36m |
| 2026-05-22 | PPARA | - | May 22, 21:45 UTC | May 23, 00:50 UTC | 3h 5m |
| 2026-05-22 | PPARA | RST → ILG | May 22, 19:15 UTC | May 22, 21:00 UTC | 1h 45m |
| 2026-05-18 | PPARA | - | May 18, 22:25 UTC | May 19, 00:30 UTC | 2h 5m |
| 2026-05-15 | PPARA | - | May 15, 14:40 UTC | May 15, 17:05 UTC | 2h 24m |
| 2026-05-15 | PPARA | - | May 15, 09:55 UTC | May 15, 10:15 UTC | 20m |
| 2026-05-15 | PPARA | - | May 15, 02:05 UTC | May 15, 08:55 UTC | 6h 50m |
| 2026-05-14 | PPARA | - | May 14, 21:25 UTC | May 14, 21:45 UTC | 20m |
| 2026-05-13 | PPARA | CGH → CGH | May 13, 16:25 UTC | May 13, 22:10 UTC | 5h 45m |
| 2026-05-11 | PPARA | - | May 11, 20:30 UTC | May 11, 20:55 UTC | 25m |
| 2026-05-03 | PPARA | - | May 3, 19:05 UTC | May 3, 22:00 UTC | 2h 55m |
| 2026-04-30 | PPARA | - | Apr 30, 10:35 UTC | Apr 30, 19:25 UTC | 8h 50m |
| 2026-04-26 | PPARA | - | Apr 26, 19:15 UTC | Apr 26, 19:55 UTC | 40m |
| 2026-04-24 | PPARA | - | Apr 24, 13:25 UTC | Apr 24, 14:00 UTC | 35m |
| 2026-04-22 | PPARA | CGH → CGH | Apr 22, 13:10 UTC | Apr 22, 23:55 UTC | 10h 45m |
| 2026-04-15 | PPARA | - | Apr 15, 15:05 UTC | Apr 15, 16:20 UTC | 1h 15m |
| 2026-04-15 | PPARA | - | Apr 15, 13:15 UTC | Apr 15, 14:55 UTC | 1h 39m |
| 2026-04-15 | PPARA | - | Apr 15, 08:10 UTC | Apr 15, 08:40 UTC | 30m |
| 2026-04-15 | PPARA | - | Apr 15, 01:40 UTC | Apr 15, 02:25 UTC | 45m |
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.