Apparatus

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sensors Mode-S transponder

4601FC

ICAO 24-bit transponder address · allocated to Finland

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

Hex
4601FC
Octal
21400774
Decimal
4,588,028
Country
FI
Tail
OH-ATO
Type
AT75
No current signal · last broadcast 5h ago
Flights observed
814
Distinct callsigns
20
Country
FI
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S 4601FC.

Country allocation

The ICAO 24-bit address 4601FC 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
FIN54C - 15 2026-07-08
FIN4TA - 15 2026-07-08
FIN322 - 13 2026-07-10
FIN321 - 13 2026-07-09
FIN80U - 12 2026-07-11
FIN6KT - 12 2026-07-05
FIN5Y - 12 2026-07-03
FIN4W - 12 2026-07-11
FIN3KC - 12 2026-07-06
FIN31L - 12 2026-07-05
FIN27H - 12 2026-07-03
FIN9KH Finnair 11 2026-07-14
FIN9EJ - 11 2026-07-05
FIN7DE - 11 2026-07-11
FIN6KB Finnair 11 2026-07-14
FIN5AZ - 11 2026-07-03
FIN4QA - 11 2026-07-13
FIN4EL - 11 2026-07-03
FIN3PT - 11 2026-07-12
FIN26B - 11 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 FIN318 - Jul 14, 19:00 UTCJul 14, 19:50 UTC50m
2026-07-14 FIN317 VAA → UME Jul 14, 17:25 UTCJul 14, 17:35 UTC10m
2026-07-14 FIN317 VAA → UME Jul 14, 16:00 UTCJul 14, 16:50 UTC50m
2026-07-14 FIN6KB TLL → HEL Jul 14, 14:55 UTCJul 14, 15:10 UTC15m
2026-07-14 FIN9KH HEL → TLL Jul 14, 14:05 UTCJul 14, 14:25 UTC20m
2026-07-13 FIN318 - Jul 13, 19:30 UTCJul 13, 20:15 UTC45m
2026-07-13 FIN318 - Jul 13, 18:40 UTCJul 13, 18:50 UTC10m
2026-07-13 FIN317 VAA → UME Jul 13, 16:25 UTCJul 13, 17:10 UTC45m
2026-07-13 FIN6KB TLL → HEL Jul 13, 14:50 UTCJul 13, 15:05 UTC15m
2026-07-13 FIN9KH HEL → TLL Jul 13, 13:50 UTCJul 13, 14:10 UTC20m
2026-07-13 FIN36J HEL → HEL Jul 13, 11:05 UTCJul 13, 12:50 UTC1h 45m
2026-07-13 FIN6TL - Jul 13, 07:20 UTCJul 13, 09:10 UTC1h 50m
2026-07-13 FIN947 HEL → TRD Jul 13, 04:40 UTCJul 13, 06:35 UTC1h 55m
2026-07-13 FIN4QA - Jul 13, 02:35 UTCJul 13, 03:30 UTC55m
2026-07-12 FIN3PT - Jul 12, 21:55 UTCJul 12, 22:45 UTC50m
2026-07-12 FIN7PJ - Jul 12, 18:30 UTCJul 12, 20:45 UTC2h 15m
2026-07-12 FIN4DU - Jul 12, 15:01 UTCJul 12, 17:20 UTC2h 20m
2026-07-11 FIN89W - Jul 11, 15:45 UTCJul 11, 17:15 UTC1h 30m
2026-07-11 FIN1RE HEL → VNO Jul 11, 13:40 UTCJul 11, 15:10 UTC1h 30m
2026-07-11 FIN4W - Jul 11, 10:45 UTCJul 11, 12:15 UTC1h 30m
2026-07-11 FIN80U - Jul 11, 08:20 UTCJul 11, 09:55 UTC1h 35m
2026-07-11 FIN9T - Jul 11, 07:10 UTCJul 11, 07:25 UTC15m
2026-07-11 FIN7DE HEL → TLL Jul 11, 06:15 UTCJul 11, 06:30 UTC15m
2026-07-11 FIN6PH - Jul 11, 05:15 UTCJul 11, 05:35 UTC20m
2026-07-11 FIN4D HEL → TLL Jul 11, 04:20 UTCJul 11, 04:40 UTC20m
2026-07-10 FIN9T TLL → HEL Jul 10, 09:55 UTCJul 10, 10:20 UTC25m
2026-07-10 FIN7DE HEL → TLL Jul 10, 09:00 UTCJul 10, 09:20 UTC20m
2026-07-10 FIN5EW - Jul 10, 06:55 UTCJul 10, 07:55 UTC1h 0m
2026-07-10 FIN881 - Jul 10, 04:50 UTCJul 10, 05:50 UTC1h 0m
2026-07-10 FIN322 - Jul 10, 02:55 UTCJul 10, 03:45 UTC50m
2026-07-09 FIN321 - Jul 9, 21:20 UTCJul 9, 22:05 UTC45m
2026-07-09 FIN7BT - Jul 9, 17:25 UTCJul 9, 18:30 UTC1h 5m
2026-07-09 FIN5CE - Jul 9, 15:40 UTCJul 9, 16:45 UTC1h 5m
2026-07-09 FIN1LT - Jul 9, 14:25 UTCJul 9, 14:45 UTC20m
2026-07-09 FIN5RG HEL → TLL Jul 9, 13:30 UTCJul 9, 13:50 UTC20m
2026-07-09 FIN23P - Jul 9, 11:30 UTCJul 9, 12:30 UTC1h 0m
2026-07-09 FIN1079 - Jul 9, 10:00 UTCJul 9, 10:55 UTC55m
2026-07-09 FIN6TL TRD → HEL Jul 9, 07:00 UTCJul 9, 08:50 UTC1h 50m
2026-07-09 FIN947 HEL → TRD Jul 9, 04:25 UTCJul 9, 06:15 UTC1h 50m
2026-07-09 FIN4QA KUO → HEL Jul 9, 02:30 UTCJul 9, 03:25 UTC55m
2026-07-08 FIN3PT - Jul 8, 21:10 UTCJul 8, 22:00 UTC50m
2026-07-08 FIN7BT - Jul 8, 16:35 UTCJul 8, 17:40 UTC1h 5m
2026-07-08 FIN5CE - Jul 8, 15:00 UTCJul 8, 16:00 UTC1h 0m
2026-07-08 FIN4TA - Jul 8, 13:35 UTCJul 8, 13:55 UTC20m
2026-07-08 FIN54C - Jul 8, 12:45 UTCJul 8, 13:05 UTC20m
2026-07-08 FIN2KK - Jul 8, 10:35 UTCJul 8, 11:50 UTC1h 15m
2026-07-08 FIN2KK - Jul 8, 08:40 UTCJul 8, 09:30 UTC50m
2026-07-08 FIN541 - Jul 8, 06:55 UTCJul 8, 07:40 UTC45m
2026-07-08 FIN541 - Jul 8, 04:35 UTCJul 8, 05:50 UTC1h 15m
2026-07-07 FIN13B - Jul 7, 18:40 UTCJul 7, 19:40 UTC1h 0m

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-ATO page for operator, model, and routing details .

Mode-S 4601FC frequently asked

What is Mode-S code 4601FC?
4601FC is an ICAO 24-bit transponder address. Allocated to Finland. Assigned to OH-ATO.
Where is Mode-S 4601FC registered?
Mode-S code 4601FC is allocated to Finland (FI). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4601FC 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 4601FC, octal 21400774, decimal 4,588,028.
What flights does 4601FC operate?
Mode-S 4601FC has broadcast 20 distinct callsigns, including FIN54C, FIN4TA, FIN322, FIN321, FIN80U.