sensors Mode-S transponder
461DA0
ICAO 24-bit transponder address · allocated to Finland
- Hex
- 461DA0
- Octal
- 21416640
- Decimal
- 4,595,104
- Country
- FI
- Flights observed
- 17
- Distinct callsigns
- 8
- Country
- FI
- Last broadcast
- 2d ago
Last known position
Country allocation
The ICAO 24-bit address 461DA0 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 8 distinct
Recent flights last 17
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-02 | FIN6AK | - | Jul 2, 20:25 UTC | Jul 2, 20:40 UTC | 15m |
| 2026-06-29 | FIN9BL | - | Jun 29, 20:09 UTC | Jun 30, 15:10 UTC | 19h 1m |
| 2026-06-20 | - | - | Jun 20, 05:19 UTC | Jun 20, 20:05 UTC | 14h 45m |
| 2026-06-17 | - | - | Jun 17, 04:35 UTC | Jun 17, 04:50 UTC | 15m |
| 2026-06-12 | FIN1855 | HEL → CHQ | Jun 12, 04:45 UTC | Jun 12, 20:20 UTC | 15h 35m |
| 2026-06-11 | FIN1855 | HEL → CHQ | Jun 11, 15:15 UTC | Jun 12, 05:05 UTC | 13h 51m |
| 2026-06-09 | FIN8PX | - | Jun 9, 15:35 UTC | Jun 9, 15:50 UTC | 15m |
| 2026-06-08 | FIN8PX | - | Jun 8, 18:40 UTC | Jun 9, 15:50 UTC | 21h 10m |
| 2026-06-03 | FIN4AR | - | Jun 3, 20:45 UTC | Jun 3, 21:00 UTC | 15m |
| 2026-05-30 | FIN1890 | AYT → HEL | May 30, 19:55 UTC | May 31, 09:45 UTC | 13h 50m |
| 2026-05-26 | - | - | May 26, 14:40 UTC | May 26, 15:05 UTC | 25m |
| 2026-05-24 | FIN4LC | BER → HEL | May 24, 07:35 UTC | May 24, 07:45 UTC | 10m |
| 2026-05-19 | FIN9BL | - | May 19, 14:25 UTC | May 19, 15:00 UTC | 35m |
| 2026-05-16 | FIN9BL | - | May 16, 20:20 UTC | May 17, 16:01 UTC | 19h 40m |
| 2026-05-16 | FIN7AV | CHQ → HEL | May 16, 10:40 UTC | May 16, 20:25 UTC | 9h 45m |
| 2026-05-14 | FIN9BL | - | May 14, 15:01 UTC | May 14, 15:10 UTC | 10m |
| 2026-05-04 | - | - | May 4, 11:25 UTC | May 4, 11:35 UTC | 10m |
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.