Apparatus

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sensors Mode-S transponder

4601F9

ICAO 24-bit transponder address · allocated to Finland

Currently assigned to OH-ATL · ATR-72-500

Hex
4601F9
Octal
21400771
Decimal
4,588,025
Country
FI
Tail
OH-ATL
Type
AT75
No current signal · last broadcast 5h ago
Flights observed
379
Distinct callsigns
20
Country
FI
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4601F9.

Country allocation

The ICAO 24-bit address 4601F9 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 20 distinct

Callsign Airline Flights Last seen
FIN7BT Finnair 11 2026-05-26
FIN2EZ Finnair 10 2026-05-21
FIN5RG Finnair 9 2026-05-26
FIN5CE Finnair 9 2026-05-26
FIN1LT Finnair 9 2026-05-26
FIN1175 Finnair 9 2026-05-21
FIN7MR Finnair 8 2026-05-23
FIN6LE Finnair 7 2026-05-28
FIN3ZP Finnair 7 2026-05-22
FIN286 Finnair 7 2026-05-28
FIN80U Finnair 6 2026-05-18
FIN5NB Finnair 6 2026-05-29
FIN58G Finnair 6 2026-05-23
FIN4W Finnair 6 2026-05-18
FIN489 Finnair 6 2026-05-29
FIN1TJ Finnair 6 2026-05-22
FIN8TQ Finnair 5 2026-05-20
FIN7PJ Finnair 5 2026-05-17
FIN7CM Finnair 5 2026-05-22
FIN6WR Finnair 5 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 FIN318 VAA → HEL May 29, 18:55 UTCMay 29, 19:35 UTC40m
2026-05-29 FIN317 VAA → UME May 29, 16:05 UTCMay 29, 16:50 UTC45m
2026-05-29 FIN6KB TLL → HEL May 29, 14:55 UTCMay 29, 15:15 UTC20m
2026-05-29 FIN9KH HEL → TLL May 29, 14:05 UTCMay 29, 14:25 UTC20m
2026-05-29 FIN36J TAY → HEL May 29, 12:15 UTCMay 29, 13:05 UTC50m
2026-05-29 FIN8NP HEL → TAY May 29, 11:00 UTCMay 29, 11:30 UTC30m
2026-05-29 FIN5NB KAO → HEL May 29, 09:10 UTCMay 29, 10:10 UTC1h 0m
2026-05-29 FIN489 HEL → KAO May 29, 06:30 UTCMay 29, 07:45 UTC1h 15m
2026-05-29 FIN9EP TLL → HEL May 29, 03:15 UTCMay 29, 03:35 UTC20m
2026-05-28 FIN5PH HEL → TLL May 28, 21:50 UTCMay 28, 22:10 UTC20m
2026-05-28 FIN594 KTT → HEL May 28, 18:20 UTCMay 28, 19:25 UTC1h 5m
2026-05-28 FIN594 KTT → HEL May 28, 17:05 UTCMay 28, 17:20 UTC15m
2026-05-28 FIN593 HEL → KTT May 28, 15:45 UTCMay 28, 16:10 UTC25m
2026-05-28 FIN593 HEL → KTT May 28, 13:25 UTCMay 28, 14:55 UTC1h 30m
2026-05-28 FIN286 JYV → HEL May 28, 11:55 UTCMay 28, 12:35 UTC40m
2026-05-28 FIN6LE HEL → JYV May 28, 10:05 UTCMay 28, 10:35 UTC30m
2026-05-28 FIN6TL TRD → HEL May 28, 07:20 UTCMay 28, 09:10 UTC1h 50m
2026-05-28 FIN947 HEL → TRD May 28, 04:45 UTCMay 28, 06:45 UTC2h 0m
2026-05-28 FIN9EP TLL → HEL May 28, 03:40 UTCMay 28, 04:00 UTC20m
2026-05-27 FIN5PH HEL → TLL May 27, 23:05 UTCMay 27, 23:20 UTC15m
2026-05-27 FIN7NP GDN → HEL May 27, 21:05 UTCMay 27, 22:10 UTC1h 5m
2026-05-27 FIN5UT HEL → GDN May 27, 17:20 UTCMay 27, 19:05 UTC1h 45m
2026-05-27 FIN6YP KUO → HEL May 27, 15:35 UTCMay 27, 16:20 UTC45m
2026-05-27 FIN42T HEL → KUO May 27, 14:10 UTCMay 27, 15:05 UTC55m
2026-05-27 FIN592 KTT → HEL May 27, 10:30 UTCMay 27, 11:50 UTC1h 20m
2026-05-27 FIN592 KTT → HEL May 27, 09:00 UTCMay 27, 09:20 UTC20m
2026-05-27 FIN4PK HEL → IVL May 27, 07:20 UTCMay 27, 07:45 UTC25m
2026-05-27 FIN4PK HEL → IVL May 27, 04:55 UTCMay 27, 06:25 UTC1h 30m
2026-05-27 FIN7DC KEM → HEL May 27, 02:24 UTCMay 27, 03:29 UTC1h 5m
2026-05-26 FIN511 HEL → KEM May 26, 20:00 UTCMay 26, 21:14 UTC1h 15m
2026-05-26 FIN7BT KAJ → HEL May 26, 17:04 UTCMay 26, 18:05 UTC1h 0m
2026-05-26 FIN5CE HEL → KAJ May 26, 15:14 UTCMay 26, 16:30 UTC1h 15m
2026-05-26 FIN1LT TLL → HEL May 26, 14:05 UTCMay 26, 14:30 UTC25m
2026-05-26 FIN5RG HEL → TLL May 26, 13:10 UTCMay 26, 13:29 UTC20m
2026-05-26 FIN286 JYV → HEL May 26, 11:50 UTCMay 26, 12:24 UTC35m
2026-05-26 FIN6LE HEL → JYV May 26, 10:39 UTCMay 26, 11:09 UTC30m
2026-05-26 FIN5NB KAO → HEL May 26, 08:59 UTCMay 26, 09:59 UTC1h 0m
2026-05-26 FIN489 HEL → KAO May 26, 06:29 UTCMay 26, 07:55 UTC1h 25m
2026-05-23 FIN5WR IVL → HEL May 23, 19:05 UTCMay 23, 20:15 UTC1h 10m
2026-05-23 FIN8TV HEL → IVL May 23, 13:40 UTCMay 23, 15:05 UTC1h 25m
2026-05-23 FIN5NB KAO → HEL May 23, 11:05 UTCMay 23, 12:15 UTC1h 10m
2026-05-23 FIN489 HEL → KAO May 23, 08:30 UTCMay 23, 09:45 UTC1h 15m
2026-05-23 FIN58G RIX → HEL May 23, 05:50 UTCMay 23, 06:45 UTC55m
2026-05-23 FIN7MR HEL → RIX May 23, 04:20 UTCMay 23, 05:10 UTC50m
2026-05-23 FIN1046 TAY → HEL May 23, 02:55 UTCMay 23, 03:35 UTC40m
2026-05-22 FIN1045 HEL → TAY May 22, 21:20 UTCMay 22, 21:55 UTC35m
2026-05-22 FIN7CM KEM → HEL May 22, 18:10 UTCMay 22, 19:20 UTC1h 10m
2026-05-22 FIN519 HEL → KEM May 22, 16:10 UTCMay 22, 17:35 UTC1h 25m
2026-05-22 FIN3ZP VAA → HEL May 22, 14:45 UTCMay 22, 15:30 UTC45m
2026-05-22 FIN1TJ HEL → VAA May 22, 13:20 UTCMay 22, 14:05 UTC45m

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 OH-ATL page for operator, model, and routing details .

Mode-S 4601F9 frequently asked

What is Mode-S code 4601F9?
4601F9 is an ICAO 24-bit transponder address. Allocated to Finland. Assigned to OH-ATL.
Where is Mode-S 4601F9 registered?
Mode-S code 4601F9 is allocated to Finland (FI). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4601F9 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4601F9, octal 21400771, decimal 4,588,025.
What flights does 4601F9 operate?
Mode-S 4601F9 has broadcast 20 distinct callsigns, including FIN7BT, FIN2EZ, FIN5RG, FIN5CE, FIN1LT.