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 6h ago
Flights observed
651
Distinct callsigns
20
Country
FI
Last broadcast
6h 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 13 2026-06-07
FIN7MR - 12 2026-07-07
FIN5CE Finnair 12 2026-06-07
FIN5RG - 11 2026-07-11
FIN5NB - 11 2026-07-05
FIN489 - 11 2026-07-05
FIN1LT - 11 2026-07-11
FIN80U - 10 2026-07-10
FIN58G - 10 2026-07-07
FIN4W - 10 2026-07-10
FIN2EZ Finnair 10 2026-05-21
FIN1175 - 10 2026-06-26
FIN3ZP - 9 2026-06-28
FIN1KH - 9 2026-07-09
FIN9VM - 8 2026-07-09
FIN9KH Finnair 8 2026-07-12
FIN6LE Finnair 8 2026-06-04
FIN6KB Finnair 8 2026-07-12
FIN4D - 8 2026-07-07
FIN3V - 8 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FIN3EA - Jul 13, 17:50 UTCJul 13, 20:25 UTC2h 35m
2026-07-13 FIN7MP HEL → BGO Jul 13, 14:30 UTCJul 13, 17:05 UTC2h 35m
2026-07-13 FIN4TA TLL → HEL Jul 13, 13:20 UTCJul 13, 13:40 UTC20m
2026-07-13 FIN54C HEL → TLL Jul 13, 12:35 UTCJul 13, 12:50 UTC15m
2026-07-13 FIN26B - Jul 13, 10:45 UTCJul 13, 11:40 UTC55m
2026-07-13 FIN3KC - Jul 13, 09:15 UTCJul 13, 10:05 UTC50m
2026-07-13 FIN2XM VNO → HEL Jul 13, 07:01 UTCJul 13, 08:25 UTC1h 25m
2026-07-13 FIN3V - Jul 13, 04:55 UTCJul 13, 06:20 UTC1h 25m
2026-07-13 FIN322 - Jul 13, 03:01 UTCJul 13, 03:45 UTC45m
2026-07-12 FIN321 - Jul 12, 21:50 UTCJul 12, 22:35 UTC45m
2026-07-12 FIN5WR - Jul 12, 19:35 UTCJul 12, 20:45 UTC1h 10m
2026-07-12 FIN8TV - Jul 12, 16:01 UTCJul 12, 17:25 UTC1h 25m
2026-07-12 FIN6KB TLL → HEL Jul 12, 14:05 UTCJul 12, 14:20 UTC15m
2026-07-12 FIN9KH HEL → TLL Jul 12, 13:10 UTCJul 12, 13:30 UTC20m
2026-07-12 FIN23P - Jul 12, 11:15 UTCJul 12, 12:20 UTC1h 5m
2026-07-12 FIN1079 - Jul 12, 09:30 UTCJul 12, 10:30 UTC1h 0m
2026-07-12 FIN2NP RIX → HEL Jul 12, 07:31 UTCJul 12, 08:30 UTC1h 0m
2026-07-12 FIN1KE HEL → RIX Jul 12, 05:55 UTCJul 12, 06:55 UTC1h 0m
2026-07-11 FIN13B - Jul 11, 19:40 UTCJul 11, 20:45 UTC1h 5m
2026-07-11 FIN1077 - Jul 11, 17:20 UTCJul 11, 18:20 UTC1h 0m
2026-07-11 FIN2MC RIX → HEL Jul 11, 15:35 UTCJul 11, 16:35 UTC1h 0m
2026-07-11 FIN6WR - Jul 11, 13:55 UTCJul 11, 15:00 UTC1h 5m
2026-07-11 FIN1LT TLL → HEL Jul 11, 12:50 UTCJul 11, 13:05 UTC15m
2026-07-11 FIN5RG HEL → TLL Jul 11, 11:45 UTCJul 11, 12:10 UTC25m
2026-07-10 FIN89W - Jul 10, 15:35 UTCJul 10, 17:05 UTC1h 30m
2026-07-10 FIN1RE - Jul 10, 13:30 UTCJul 10, 15:00 UTC1h 30m
2026-07-10 FIN4W VNO → HEL Jul 10, 11:05 UTCJul 10, 12:30 UTC1h 25m
2026-07-10 FIN80U HEL → VNO Jul 10, 08:30 UTCJul 10, 10:15 UTC1h 45m
2026-07-09 FIN3EA - Jul 9, 19:55 UTCJul 9, 22:25 UTC2h 30m
2026-07-09 FIN7MP HEL → BGO Jul 9, 16:45 UTCJul 9, 19:10 UTC2h 25m
2026-07-09 FIN6YP - Jul 9, 15:05 UTCJul 9, 15:55 UTC50m
2026-07-09 FIN42T HEL → KUO Jul 9, 13:40 UTCJul 9, 14:35 UTC55m
2026-07-09 FIN1KH - Jul 9, 11:15 UTCJul 9, 12:00 UTC45m
2026-07-09 FIN9VM - Jul 9, 09:45 UTCJul 9, 10:25 UTC40m
2026-07-09 FIN2NP - Jul 9, 07:50 UTCJul 9, 08:55 UTC1h 5m
2026-07-09 FIN1KE HEL → RIX Jul 9, 06:15 UTCJul 9, 07:15 UTC1h 0m
2026-07-09 FIN5TB TLL → HEL Jul 9, 05:15 UTCJul 9, 05:35 UTC20m
2026-07-09 FIN4LB HEL → TLL Jul 9, 04:15 UTCJul 9, 04:35 UTC20m
2026-07-09 FIN9EP TLL → HEL Jul 9, 03:00 UTCJul 9, 03:20 UTC20m
2026-07-08 FIN5PH HEL → TLL Jul 8, 21:55 UTCJul 8, 22:15 UTC20m
2026-07-08 FIN13B - Jul 8, 18:45 UTCJul 8, 19:40 UTC55m
2026-07-08 FIN1077 - Jul 8, 17:00 UTCJul 8, 18:05 UTC1h 5m
2026-07-08 FIN8G - Jul 8, 15:30 UTCJul 8, 16:25 UTC55m
2026-07-08 FIN7EN - Jul 8, 14:05 UTCJul 8, 14:55 UTC50m
2026-07-08 FIN1044 URE → HEL Jul 8, 12:35 UTCJul 8, 13:15 UTC40m
2026-07-08 FIN5YF HEL → URE Jul 8, 11:10 UTCJul 8, 11:50 UTC40m
2026-07-07 FIN950 TRD → HEL Jul 7, 18:00 UTCJul 7, 19:45 UTC1h 45m
2026-07-07 FIN949 HEL → TRD Jul 7, 15:20 UTCJul 7, 17:15 UTC1h 55m
2026-07-07 FIN440 - Jul 7, 13:15 UTCJul 7, 14:25 UTC1h 10m
2026-07-07 FIN8AK - Jul 7, 11:30 UTCJul 7, 12:40 UTC1h 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.

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 6h 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, FIN7MR, FIN5CE, FIN5RG, FIN5NB.