Apparatus

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sensors Mode-S transponder

4601FB

ICAO 24-bit transponder address · allocated to Finland

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

Hex
4601FB
Octal
21400773
Decimal
4,588,027
Country
FI
Tail
OH-ATN
Type
AT75
No current signal · last broadcast Jul 26, 15:30 UTC
Flights observed
819
Distinct callsigns
20
Country
FI
Last broadcast
Jul 26, 15:30 UTC

Last known position

Most recent position reported by Mode-S 4601FB.

Country allocation

The ICAO 24-bit address 4601FB 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
FIN317 Finnair 21 2026-07-22
FIN318 Finnair 20 2026-07-22
FIN9KH Finnair 14 2026-07-25
FIN6KB Finnair 14 2026-07-25
FIN26B - 13 2026-07-16
FIN7DE - 12 2026-07-12
FIN5RG - 12 2026-07-22
FIN3ZP - 12 2026-07-11
FIN3KC - 12 2026-07-16
FIN322 Finnair 12 2026-07-23
FIN321 Finnair 12 2026-07-22
FIN1TJ - 12 2026-07-11
FIN9T - 11 2026-07-12
FIN8NP - 11 2026-07-12
FIN592 Finnair 11 2026-07-26
FIN4QA - 11 2026-06-20
FIN4PK Finnair 11 2026-07-26
FIN1LT - 11 2026-07-22
FIN6PH - 10 2026-07-12
FIN4D - 10 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FIN7PH KEM → HEL Jul 26, 13:55 UTCJul 26, 15:20 UTC1h 25m
2026-07-26 FIN8Q HEL → KEM Jul 26, 11:50 UTCJul 26, 13:00 UTC1h 10m
2026-07-26 FIN592 KTT → HEL Jul 26, 09:35 UTCJul 26, 10:55 UTC1h 20m
2026-07-26 FIN592 KTT → HEL Jul 26, 07:55 UTCJul 26, 08:10 UTC15m
2026-07-26 FIN4PK HEL → IVL Jul 26, 06:15 UTCJul 26, 06:35 UTC21m
2026-07-26 FIN4PK HEL → IVL Jul 26, 03:55 UTCJul 26, 05:10 UTC1h 15m
2026-07-25 FIN950 TRD → HEL Jul 25, 21:00 UTCJul 25, 21:05 UTC5m
2026-07-25 FIN950 TRD → HEL Jul 25, 18:35 UTCJul 25, 20:20 UTC1h 45m
2026-07-25 FIN949 HEL → TRD Jul 25, 16:00 UTCJul 25, 17:55 UTC1h 55m
2026-07-25 FIN6KB TLL → HEL Jul 25, 14:55 UTCJul 25, 15:15 UTC20m
2026-07-25 FIN9KH HEL → TLL Jul 25, 13:50 UTCJul 25, 14:10 UTC20m
2026-07-25 FIN9Y IVL → HEL Jul 25, 10:50 UTCJul 25, 12:10 UTC1h 20m
2026-07-25 FIN7KL LHR → HEL Jul 25, 05:20 UTCJul 25, 06:35 UTC1h 15m
2026-07-24 FIN5NB KAO → HEL Jul 24, 12:50 UTCJul 24, 13:55 UTC1h 5m
2026-07-24 FIN489 HEL → KAO Jul 24, 10:15 UTCJul 24, 11:25 UTC1h 10m
2026-07-24 FIN602 IVL → HEL Jul 24, 08:10 UTCJul 24, 09:20 UTC1h 10m
2026-07-24 FIN2PC HEL → IVL Jul 24, 04:40 UTCJul 24, 05:50 UTC1h 10m
2026-07-23 FIN594 - Jul 23, 18:15 UTCJul 23, 19:20 UTC1h 5m
2026-07-23 FIN594 - Jul 23, 16:45 UTCJul 23, 17:00 UTC15m
2026-07-23 FIN593 HEL → KTT Jul 23, 15:25 UTCJul 23, 15:45 UTC20m
2026-07-23 FIN593 HEL → KTT Jul 23, 13:05 UTCJul 23, 14:30 UTC1h 25m
2026-07-23 FIN9Y IVL → HEL Jul 23, 10:15 UTCJul 23, 11:25 UTC1h 10m
2026-07-23 FIN7KL LHR → HEL Jul 23, 04:55 UTCJul 23, 06:15 UTC1h 20m
2026-07-23 FIN322 VAA → HEL Jul 23, 02:55 UTCJul 23, 03:40 UTC45m
2026-07-22 FIN321 HEL → VAA Jul 22, 21:15 UTCJul 22, 22:00 UTC45m
2026-07-22 FIN318 VAA → HEL Jul 22, 18:45 UTCJul 22, 19:30 UTC45m
2026-07-22 FIN317 VAA → UME Jul 22, 17:10 UTCJul 22, 17:20 UTC10m
2026-07-22 FIN317 VAA → UME Jul 22, 15:45 UTCJul 22, 16:35 UTC50m
2026-07-22 FIN1LT - Jul 22, 14:00 UTCJul 22, 14:20 UTC20m
2026-07-22 FIN5RG HEL → TLL Jul 22, 13:10 UTCJul 22, 13:25 UTC15m
2026-07-22 FIN592 KTT → HEL Jul 22, 11:10 UTCJul 22, 12:00 UTC50m
2026-07-22 FIN4PK HEL → IVL Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-21 FIN3EA BGO → HEL Jul 21, 18:55 UTCJul 21, 21:10 UTC2h 15m
2026-07-21 FIN7MP HEL → BGO Jul 21, 15:35 UTCJul 21, 18:10 UTC2h 35m
2026-07-21 FIN7PH KEM → HEL Jul 21, 13:15 UTCJul 21, 14:30 UTC1h 15m
2026-07-21 FIN8Q - Jul 21, 11:10 UTCJul 21, 12:25 UTC1h 15m
2026-07-21 FIN2EZ GDN → HEL Jul 21, 09:40 UTCJul 21, 10:15 UTC35m
2026-07-21 FIN2EZ GDN → HEL Jul 21, 08:15 UTCJul 21, 08:30 UTC15m
2026-07-21 FIN1175 - Jul 21, 05:30 UTCJul 21, 06:55 UTC1h 25m
2026-07-20 FIN1LT - Jul 20, 14:00 UTCJul 20, 14:15 UTC15m
2026-07-20 FIN5RG - Jul 20, 12:55 UTCJul 20, 13:15 UTC20m
2026-07-20 FIN1KH - Jul 20, 11:20 UTCJul 20, 12:10 UTC50m
2026-07-20 FIN9VM - Jul 20, 09:45 UTCJul 20, 10:30 UTC45m
2026-07-20 FIN2NP RIX → HEL Jul 20, 07:45 UTCJul 20, 08:40 UTC55m
2026-07-20 FIN1KE HEL → RIX Jul 20, 06:10 UTCJul 20, 07:10 UTC1h 0m
2026-07-20 FIN5TB - Jul 20, 05:05 UTCJul 20, 05:25 UTC20m
2026-07-20 FIN4LB HEL → TLL Jul 20, 04:05 UTCJul 20, 04:30 UTC25m
2026-07-20 FIN9EP TLL → HEL Jul 20, 03:05 UTCJul 20, 03:25 UTC20m
2026-07-19 FIN5PH HEL → TLL Jul 19, 21:40 UTCJul 19, 22:05 UTC25m
2026-07-19 FIN7BT - Jul 19, 17:05 UTCJul 19, 18:05 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-ATN page for operator, model, and routing details .

Mode-S 4601FB frequently asked

What is Mode-S code 4601FB?
4601FB is an ICAO 24-bit transponder address. Allocated to Finland. Assigned to OH-ATN.
Where is Mode-S 4601FB registered?
Mode-S code 4601FB is allocated to Finland (FI). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4601FB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4601FB, octal 21400773, decimal 4,588,027.
What flights does 4601FB operate?
Mode-S 4601FB has broadcast 20 distinct callsigns, including FIN317, FIN318, FIN9KH, FIN6KB, FIN26B.