Apparatus

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sensors Mode-S transponder

4601F4

ICAO 24-bit transponder address · allocated to Finland

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

Hex
4601F4
Octal
21400764
Decimal
4,588,020
Country
FI
Tail
OH-ATG
Type
AT75
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
780
Distinct callsigns
20
Country
FI
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 4601F4.

Country allocation

The ICAO 24-bit address 4601F4 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
FIN541 Finnair 22 2026-07-22
FIN2KK - 17 2026-07-22
FIN4W - 16 2026-07-18
FIN89W - 15 2026-07-18
FIN80U - 15 2026-07-18
FIN1RE - 14 2026-07-18
FIN7EN - 12 2026-07-24
FIN9KH Finnair 11 2026-07-23
FIN8G - 11 2026-07-24
FIN7MR Finnair 11 2026-07-26
FIN6KB Finnair 11 2026-07-23
FIN58G Finnair 11 2026-07-26
FIN36J Finnair 11 2026-07-24
FIN9T - 10 2026-07-18
FIN8NP Finnair 10 2026-07-24
FIN7KE Finnair 10 2026-07-26
FIN2MC - 10 2026-07-09
FIN13B - 10 2026-07-20
FIN7DE - 9 2026-07-18
FIN6WR - 9 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FIN1T HEL → JYV Jul 26, 20:50 UTCJul 26, 21:15 UTC25m
2026-07-26 FIN7KE MHQ → HEL Jul 26, 19:25 UTCJul 26, 20:00 UTC35m
2026-07-26 FIN6KC CPH → HEL Jul 26, 18:10 UTCJul 26, 18:45 UTC35m
2026-07-26 FIN9XG RVN → HEL Jul 26, 15:55 UTCJul 26, 17:15 UTC1h 20m
2026-07-26 FIN9PE HEL → RVN Jul 26, 13:20 UTCJul 26, 14:25 UTC1h 5m
2026-07-26 FIN2EZ GDN → HEL Jul 26, 10:25 UTCJul 26, 12:20 UTC1h 55m
2026-07-26 FIN1175 HEL → GDN Jul 26, 07:30 UTCJul 26, 09:40 UTC2h 10m
2026-07-26 FIN58G RIX → HEL Jul 26, 05:50 UTCJul 26, 06:45 UTC56m
2026-07-26 FIN7MR HEL → RIX Jul 26, 04:10 UTCJul 26, 05:10 UTC1h 0m
2026-07-26 FIN9EP TLL → HEL Jul 26, 03:05 UTCJul 26, 03:30 UTC25m
2026-07-25 FIN5PH HEL → TLL Jul 25, 21:25 UTCJul 25, 21:45 UTC20m
2026-07-25 FIN5AZ TLL → HEL Jul 25, 20:20 UTCJul 25, 20:40 UTC20m
2026-07-25 FIN4EL HEL → TLL Jul 25, 19:25 UTCJul 25, 19:45 UTC20m
2026-07-25 FIN7BT KAJ → HEL Jul 25, 16:25 UTCJul 25, 17:30 UTC1h 5m
2026-07-25 FIN5CE - Jul 25, 14:50 UTCJul 25, 15:45 UTC55m
2026-07-25 FIN7KE MHQ → HEL Jul 25, 13:30 UTCJul 25, 14:05 UTC35m
2026-07-25 FIN6KC CPH → HEL Jul 25, 12:10 UTCJul 25, 12:50 UTC40m
2026-07-25 FIN5X KTT → HEL Jul 25, 07:40 UTCJul 25, 09:00 UTC1h 20m
2026-07-25 FIN5PK HEL → KTT Jul 25, 04:35 UTCJul 25, 05:50 UTC1h 15m
2026-07-25 FIN9EP TLL → HEL Jul 25, 03:10 UTCJul 25, 03:30 UTC20m
2026-07-24 FIN5PH HEL → TLL Jul 24, 22:00 UTCJul 24, 22:20 UTC20m
2026-07-24 FIN5AZ TLL → HEL Jul 24, 20:20 UTCJul 24, 20:40 UTC20m
2026-07-24 FIN4EL HEL → TLL Jul 24, 19:25 UTCJul 24, 19:45 UTC20m
2026-07-24 FIN8G - Jul 24, 15:35 UTCJul 24, 16:25 UTC50m
2026-07-24 FIN7EN - Jul 24, 14:05 UTCJul 24, 14:55 UTC50m
2026-07-24 FIN36J TAY → HEL Jul 24, 12:05 UTCJul 24, 12:45 UTC40m
2026-07-24 FIN8NP HEL → TAY Jul 24, 10:55 UTCJul 24, 11:30 UTC35m
2026-07-23 FIN318 VAA → HEL Jul 23, 19:25 UTCJul 23, 20:20 UTC55m
2026-07-23 FIN318 VAA → HEL Jul 23, 18:40 UTCJul 23, 18:50 UTC10m
2026-07-23 FIN317 VAA → UME Jul 23, 16:20 UTCJul 23, 17:05 UTC45m
2026-07-23 FIN6KB TLL → HEL Jul 23, 15:00 UTCJul 23, 15:20 UTC20m
2026-07-23 FIN9KH HEL → TLL Jul 23, 14:00 UTCJul 23, 14:20 UTC20m
2026-07-23 FIN36J TAY → HEL Jul 23, 12:20 UTCJul 23, 13:05 UTC45m
2026-07-23 FIN8NP HEL → TAY Jul 23, 11:00 UTCJul 23, 11:35 UTC35m
2026-07-23 FIN6EH ARN → HEL Jul 23, 09:05 UTCJul 23, 10:00 UTC55m
2026-07-23 FIN3EJ HEL → ARN Jul 23, 07:15 UTCJul 23, 08:20 UTC1h 5m
2026-07-23 FIN3RM MHQ → HEL Jul 23, 05:40 UTCJul 23, 06:20 UTC40m
2026-07-23 FIN6NC - Jul 23, 04:25 UTCJul 23, 05:00 UTC35m
2026-07-23 FIN4QA HEL → AMS Jul 23, 02:30 UTCJul 23, 03:15 UTC45m
2026-07-22 FIN3PT HEL → KUO Jul 22, 21:05 UTCJul 22, 21:55 UTC50m
2026-07-22 FIN950 TRD → HEL Jul 22, 16:15 UTCJul 22, 18:05 UTC1h 50m
2026-07-22 FIN949 HEL → TRD Jul 22, 13:50 UTCJul 22, 15:45 UTC1h 55m
2026-07-22 FIN2KK - Jul 22, 11:10 UTCJul 22, 11:45 UTC35m
2026-07-22 FIN541 HEL → RVN Jul 22, 04:35 UTCJul 22, 05:25 UTC50m
2026-07-21 FIN3RM - Jul 21, 20:05 UTCJul 21, 20:45 UTC40m
2026-07-21 FIN6NC - Jul 21, 18:55 UTCJul 21, 19:35 UTC40m
2026-07-21 FIN7BT - Jul 21, 16:45 UTCJul 21, 17:50 UTC1h 5m
2026-07-21 FIN5CE - Jul 21, 15:05 UTCJul 21, 16:10 UTC1h 5m
2026-07-21 FIN1LT TLL → HEL Jul 21, 14:05 UTCJul 21, 14:25 UTC20m
2026-07-21 FIN5RG HEL → TLL Jul 21, 13:05 UTCJul 21, 13:25 UTC20m

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

Mode-S 4601F4 frequently asked

What is Mode-S code 4601F4?
4601F4 is an ICAO 24-bit transponder address. Allocated to Finland. Assigned to OH-ATG.
Where is Mode-S 4601F4 registered?
Mode-S code 4601F4 is allocated to Finland (FI). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4601F4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4601F4, octal 21400764, decimal 4,588,020.
What flights does 4601F4 operate?
Mode-S 4601F4 has broadcast 20 distinct callsigns, including FIN541, FIN2KK, FIN4W, FIN89W, FIN80U.