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 Jul 26, 22:05 UTC
Flights observed
847
Distinct callsigns
20
Country
FI
Last broadcast
Jul 26, 22:05 UTC

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
FIN5Y - 14 2026-07-24
FIN321 Finnair 14 2026-07-26
FIN27H Finnair 14 2026-07-24
FIN322 - 13 2026-07-10
FIN9KH Finnair 12 2026-07-26
FIN80U - 12 2026-07-11
FIN6KT - 12 2026-07-05
FIN6KB Finnair 12 2026-07-26
FIN5AZ - 12 2026-07-19
FIN4W - 12 2026-07-11
FIN4EL - 12 2026-07-19
FIN3KC - 12 2026-07-06
FIN31L - 12 2026-07-05
FIN9EJ - 11 2026-07-05
FIN7DE - 11 2026-07-11
FIN541 Finnair 11 2026-07-26
FIN4QA - 11 2026-07-13
FIN3PT - 11 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FIN321 HEL → VAA Jul 26, 21:20 UTCJul 26, 22:05 UTC45m
2026-07-26 FIN5WR IVL → HEL Jul 26, 19:20 UTCJul 26, 20:45 UTC1h 25m
2026-07-26 FIN8TV HEL → IVL Jul 26, 15:55 UTCJul 26, 17:00 UTC1h 5m
2026-07-26 FIN6KB TLL → HEL Jul 26, 14:15 UTCJul 26, 14:35 UTC20m
2026-07-26 FIN9KH HEL → TLL Jul 26, 13:20 UTCJul 26, 13:40 UTC20m
2026-07-26 FIN2KK RVN → HEL Jul 26, 10:55 UTCJul 26, 12:25 UTC1h 30m
2026-07-26 FIN2KK RVN → HEL Jul 26, 08:55 UTCJul 26, 09:45 UTC50m
2026-07-26 FIN541 HEL → RVN Jul 26, 07:10 UTCJul 26, 07:50 UTC40m
2026-07-26 FIN541 HEL → RVN Jul 26, 04:45 UTCJul 26, 05:55 UTC1h 10m
2026-07-25 FIN2KK RVN → HEL Jul 25, 10:35 UTCJul 25, 11:55 UTC1h 20m
2026-07-25 FIN2KK RVN → HEL Jul 25, 08:45 UTCJul 25, 09:30 UTC45m
2026-07-25 FIN541 HEL → RVN Jul 25, 06:55 UTCJul 25, 07:35 UTC40m
2026-07-25 FIN541 HEL → RVN Jul 25, 04:45 UTCJul 25, 06:00 UTC1h 15m
2026-07-24 FIN27H TLL → HEL Jul 24, 18:50 UTCJul 24, 19:15 UTC25m
2026-07-24 FIN5Y HEL → TLL Jul 24, 18:00 UTCJul 24, 18:20 UTC20m
2026-07-24 FIN89W VNO → HEL Jul 24, 15:50 UTCJul 24, 17:20 UTC1h 30m
2026-07-24 FIN1RE HEL → VNO Jul 24, 13:40 UTCJul 24, 15:10 UTC1h 30m
2026-07-24 FIN1KH VAA → HEL Jul 24, 12:05 UTCJul 24, 12:50 UTC45m
2026-07-24 FIN9VM HEL → VAA Jul 24, 10:20 UTCJul 24, 11:10 UTC50m
2026-07-24 FIN2EZ GDN → HEL Jul 24, 08:10 UTCJul 24, 09:10 UTC1h 0m
2026-07-24 FIN2EZ GDN → HEL Jul 24, 07:10 UTCJul 24, 07:30 UTC20m
2026-07-24 FIN1175 HEL → GDN Jul 24, 04:20 UTCJul 24, 05:50 UTC1h 30m
2026-07-23 FIN7DZ HEL → OUL Jul 23, 18:55 UTCJul 23, 21:40 UTC2h 45m
2026-07-23 FIN9LK GOT → HEL Jul 23, 16:15 UTCJul 23, 18:05 UTC1h 50m
2026-07-23 FIN4NR HEL → GOT Jul 23, 13:45 UTCJul 23, 15:35 UTC1h 50m
2026-07-19 FIN5AZ TLL → HEL Jul 19, 19:40 UTCJul 19, 20:00 UTC20m
2026-07-19 FIN4EL HEL → TLL Jul 19, 18:40 UTCJul 19, 19:05 UTC25m
2026-07-19 FIN27H TLL → HEL Jul 19, 17:40 UTCJul 19, 18:00 UTC20m
2026-07-19 FIN5Y HEL → TLL Jul 19, 16:45 UTCJul 19, 17:05 UTC20m
2026-07-19 FIN23P - Jul 19, 11:10 UTCJul 19, 12:05 UTC55m
2026-07-19 FIN1079 HEL → RIX Jul 19, 09:35 UTCJul 19, 10:35 UTC1h 0m
2026-07-17 FIN8934 DUS → DUS Jul 17, 10:10 UTCJul 17, 11:10 UTC1h 0m
2026-07-16 FIN881 - Jul 16, 04:45 UTCJul 16, 05:45 UTC1h 0m
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

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 Jul 26, 22:05 UTC.
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, FIN5Y, FIN321, FIN27H.