sensors Mode-S transponder
461F1C
ICAO 24-bit transponder address · allocated to Finland
- Hex
- 461F1C
- Octal
- 21417434
- Decimal
- 4,595,484
- Country
- FI
- Flights observed
- 19
- Distinct callsigns
- 11
- Country
- FI
- Last broadcast
- 5d ago
Last known position
Country allocation
The ICAO 24-bit address 461F1C falls within the block assigned to Finland (FI) by ICAO Annex 10, Volume III. Every aircraft registered in Finland 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 11 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| FIN6AK | - | 3 | 2026-06-17 |
| FIN1RC | Finnair | 3 | 2026-06-21 |
| FIN9BL | - | 2 | 2026-05-27 |
| FIN84G | Finnair | 2 | 2026-05-23 |
| FIN7AV | Finnair | 2 | 2026-06-04 |
| FIN8BC | Finnair | 1 | 2026-06-27 |
| FIN78C | - | 1 | 2026-06-26 |
| FIN75D | - | 1 | 2026-06-13 |
| FIN4LC | Finnair | 1 | 2026-06-13 |
| FIN4AR | - | 1 | 2026-07-01 |
| FIN1858 | Finnair | 1 | 2026-05-17 |
Recent flights last 19
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-01 | FIN4AR | - | Jul 1, 20:25 UTC | Jul 2, 10:45 UTC | 14h 20m |
| 2026-06-27 | FIN8BC | PVK → HEL | Jun 27, 16:24 UTC | Jun 28, 11:00 UTC | 18h 35m |
| 2026-06-26 | FIN78C | - | Jun 26, 04:45 UTC | Jun 26, 15:15 UTC | 10h 30m |
| 2026-06-21 | FIN1RC | HEL → VRN | Jun 21, 21:39 UTC | Jun 21, 21:54 UTC | 15m |
| 2026-06-18 | FIN1RC | HEL → VRN | Jun 18, 04:50 UTC | Jun 18, 20:30 UTC | 15h 40m |
| 2026-06-17 | FIN6AK | - | Jun 17, 20:35 UTC | Jun 18, 04:50 UTC | 8h 15m |
| 2026-06-17 | FIN6AK | - | Jun 17, 04:55 UTC | Jun 17, 21:00 UTC | 16h 5m |
| 2026-06-13 | FIN4LC | BER → HEL | Jun 13, 14:50 UTC | Jun 14, 06:25 UTC | 15h 35m |
| 2026-06-13 | FIN75D | - | Jun 13, 09:45 UTC | Jun 14, 06:25 UTC | 20h 40m |
| 2026-06-09 | FIN1RC | HEL → VRN | Jun 9, 18:35 UTC | Jun 10, 05:15 UTC | 10h 40m |
| 2026-06-06 | - | - | Jun 6, 04:55 UTC | Jun 6, 05:15 UTC | 20m |
| 2026-06-04 | FIN7AV | CHQ → HEL | Jun 4, 10:25 UTC | Jun 4, 20:35 UTC | 10h 10m |
| 2026-05-27 | FIN9BL | - | May 27, 04:39 UTC | May 27, 14:45 UTC | 10h 5m |
| 2026-05-24 | FIN9BL | - | May 24, 15:35 UTC | May 24, 21:30 UTC | 5h 55m |
| 2026-05-23 | FIN84G | RHO → HEL | May 23, 10:45 UTC | May 23, 11:20 UTC | 35m |
| 2026-05-20 | FIN6AK | CHQ → HEL | May 20, 20:40 UTC | May 20, 20:55 UTC | 15m |
| 2026-05-17 | FIN1858 | CHQ → HEL | May 17, 11:40 UTC | May 17, 11:55 UTC | 15m |
| 2026-05-15 | FIN7AV | CHQ → HEL | May 15, 12:40 UTC | May 15, 13:05 UTC | 25m |
| 2026-05-14 | FIN84G | RHO → HEL | May 14, 11:01 UTC | May 14, 11:15 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.