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 6h ago
Flights observed
737
Distinct callsigns
20
Country
FI
Last broadcast
6h ago

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 18 2026-07-09
FIN318 - 17 2026-07-09
FIN9KH Finnair 13 2026-07-08
FIN6KB Finnair 13 2026-07-08
FIN7DE - 12 2026-07-12
FIN3ZP - 12 2026-07-11
FIN26B - 12 2026-07-08
FIN1TJ - 12 2026-07-11
FIN9T - 11 2026-07-12
FIN8NP - 11 2026-07-12
FIN4QA - 11 2026-06-20
FIN3KC - 11 2026-07-08
FIN322 - 11 2026-07-04
FIN321 - 11 2026-07-03
FIN6PH - 10 2026-07-12
FIN4D - 10 2026-07-12
FIN3PT - 10 2026-06-19
FIN88T - 9 2026-06-19
FIN5RG - 9 2026-07-13
FIN42T Finnair 9 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 FIN7KE - Jul 13, 18:35 UTCJul 13, 20:25 UTC1h 50m
2026-07-13 FIN7BT - Jul 13, 16:45 UTCJul 13, 17:50 UTC1h 5m
2026-07-13 FIN5CE - Jul 13, 15:00 UTCJul 13, 16:10 UTC1h 10m
2026-07-13 FIN1LT TLL → HEL Jul 13, 13:50 UTCJul 13, 14:10 UTC20m
2026-07-13 FIN5RG HEL → TLL Jul 13, 13:05 UTCJul 13, 13:25 UTC20m
2026-07-13 FIN1KH - Jul 13, 11:10 UTCJul 13, 12:10 UTC1h 0m
2026-07-13 FIN9VM - Jul 13, 09:35 UTCJul 13, 10:20 UTC45m
2026-07-13 FIN1KE HEL → HEL Jul 13, 06:01 UTCJul 13, 08:30 UTC2h 30m
2026-07-13 FIN5TB - Jul 13, 05:01 UTCJul 13, 05:20 UTC20m
2026-07-13 FIN4LB HEL → TLL Jul 13, 04:15 UTCJul 13, 04:30 UTC15m
2026-07-13 FIN9EP TLL → HEL Jul 13, 03:05 UTCJul 13, 03:25 UTC20m
2026-07-12 FIN5PH HEL → TLL Jul 12, 22:10 UTCJul 12, 22:35 UTC25m
2026-07-12 FIN13B - Jul 12, 19:15 UTCJul 12, 20:10 UTC55m
2026-07-12 FIN1077 - Jul 12, 17:40 UTCJul 12, 18:35 UTC55m
2026-07-12 FIN4TA - Jul 12, 16:40 UTCJul 12, 16:55 UTC15m
2026-07-12 FIN54C HEL → TLL Jul 12, 15:50 UTCJul 12, 16:05 UTC15m
2026-07-12 FIN36J - Jul 12, 12:15 UTCJul 12, 13:01 UTC45m
2026-07-12 FIN8NP - Jul 12, 10:55 UTCJul 12, 11:30 UTC35m
2026-07-12 FIN1044 - Jul 12, 09:40 UTCJul 12, 10:20 UTC40m
2026-07-12 FIN5YF - Jul 12, 08:25 UTCJul 12, 09:00 UTC35m
2026-07-12 FIN9T - Jul 12, 07:20 UTCJul 12, 07:40 UTC20m
2026-07-12 FIN7DE - Jul 12, 06:25 UTCJul 12, 06:45 UTC20m
2026-07-12 FIN6PH TLL → HEL Jul 12, 05:20 UTCJul 12, 05:40 UTC20m
2026-07-12 FIN4D HEL → TLL Jul 12, 04:25 UTCJul 12, 04:45 UTC20m
2026-07-11 FIN6MB - Jul 11, 18:40 UTCJul 11, 20:10 UTC1h 30m
2026-07-11 FIN4N - Jul 11, 16:15 UTCJul 11, 17:30 UTC1h 15m
2026-07-11 FIN3ZP - Jul 11, 14:35 UTCJul 11, 15:25 UTC50m
2026-07-11 FIN1TJ - Jul 11, 13:05 UTCJul 11, 13:50 UTC45m
2026-07-11 FIN1KH - Jul 11, 11:10 UTCJul 11, 12:05 UTC55m
2026-07-11 FIN9VM - Jul 11, 09:40 UTCJul 11, 10:20 UTC40m
2026-07-11 FIN6TL - Jul 11, 06:55 UTCJul 11, 08:45 UTC1h 50m
2026-07-11 FIN947 HEL → TRD Jul 11, 04:15 UTCJul 11, 06:05 UTC1h 50m
2026-07-10 FIN31L - Jul 10, 11:45 UTCJul 10, 12:10 UTC25m
2026-07-10 FIN6KT HEL → TLL Jul 10, 10:55 UTCJul 10, 11:10 UTC15m
2026-07-10 FIN9LG - Jul 10, 09:05 UTCJul 10, 10:10 UTC1h 5m
2026-07-10 FIN9B - Jul 10, 07:15 UTCJul 10, 08:20 UTC1h 5m
2026-07-10 FIN58G - Jul 10, 05:25 UTCJul 10, 06:20 UTC55m
2026-07-10 FIN7MR HEL → RIX Jul 10, 03:55 UTCJul 10, 04:50 UTC55m
2026-07-09 FIN318 - Jul 9, 19:00 UTCJul 9, 19:50 UTC50m
2026-07-09 FIN318 - Jul 9, 18:15 UTCJul 9, 18:25 UTC10m
2026-07-09 FIN317 VAA → UME Jul 9, 15:55 UTCJul 9, 16:40 UTC45m
2026-07-09 FIN7PH KEM → HEL Jul 9, 13:15 UTCJul 9, 14:35 UTC1h 20m
2026-07-09 FIN8Q - Jul 9, 11:20 UTCJul 9, 12:40 UTC1h 20m
2026-07-09 FIN9T TLL → HEL Jul 9, 10:15 UTCJul 9, 10:35 UTC20m
2026-07-09 FIN7DE HEL → TLL Jul 9, 09:20 UTCJul 9, 09:40 UTC20m
2026-07-09 FIN6PH TLL → HEL Jul 9, 08:05 UTCJul 9, 08:25 UTC20m
2026-07-09 FIN4D HEL → TLL Jul 9, 07:10 UTCJul 9, 07:25 UTC15m
2026-07-09 FIN58G HEL → HEL Jul 9, 03:55 UTCJul 9, 06:20 UTC2h 25m
2026-07-08 FIN7NP - Jul 8, 18:50 UTCJul 8, 20:50 UTC2h 0m
2026-07-08 FIN5UT - Jul 8, 16:20 UTCJul 8, 18:10 UTC1h 50m

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 6h ago.
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, FIN7DE.