sensors Mode-S transponder
461B9C
ICAO 24-bit transponder address · allocated to Finland
- Hex
- 461B9C
- Octal
- 21415634
- Decimal
- 4,594,588
- Country
- FI
- Flights observed
- 13
- Distinct callsigns
- 7
- Country
- FI
- Last broadcast
- 13d ago
Last known position
Country allocation
The ICAO 24-bit address 461B9C 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 7 distinct
Recent flights last 13
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-17 | FIN6AK | - | Jul 17, 21:39 UTC | Jul 18, 19:30 UTC | 21h 51m |
| 2026-07-17 | FIN1855 | - | Jul 17, 05:45 UTC | Jul 17, 21:39 UTC | 15h 55m |
| 2026-07-12 | FIN78C | - | Jul 12, 14:40 UTC | Jul 12, 14:50 UTC | 10m |
| 2026-07-01 | - | - | Jul 1, 15:00 UTC | Jul 2, 05:15 UTC | 14h 15m |
| 2026-06-30 | FIN7AV | - | Jun 30, 09:55 UTC | Jun 30, 10:20 UTC | 25m |
| 2026-06-26 | - | - | Jun 26, 20:29 UTC | Jun 27, 16:24 UTC | 19h 55m |
| 2026-06-23 | - | - | Jun 23, 15:55 UTC | Jun 23, 16:14 UTC | 20m |
| 2026-06-17 | FIN78C | - | Jun 17, 21:00 UTC | Jun 18, 14:55 UTC | 17h 55m |
| 2026-06-16 | FIN7AV | - | Jun 16, 10:00 UTC | Jun 17, 04:55 UTC | 18h 56m |
| 2026-06-12 | FIN1AU | - | Jun 12, 04:55 UTC | Jun 12, 05:15 UTC | 20m |
| 2026-06-09 | FIN1RC | HEL → VRN | Jun 9, 23:45 UTC | Jun 10, 00:05 UTC | 20m |
| 2026-05-24 | FIN9BL | - | May 24, 15:30 UTC | May 24, 21:40 UTC | 6h 10m |
| 2026-05-23 | - | - | May 23, 05:00 UTC | May 23, 11:20 UTC | 6h 20m |
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.