Apparatus

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sensors Mode-S transponder

4631CD

ICAO 24-bit transponder address · allocated to Finland

Currently assigned to OH-SWJ · CESSNA 525A Citation CJ2

Hex
4631CD
Octal
21430715
Decimal
4,600,269
Country
FI
Tail
OH-SWJ
Type
C25A
No current signal · last broadcast 1d ago
Flights observed
47
Distinct callsigns
3
Country
FI
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4631CD.

Country allocation

The ICAO 24-bit address 4631CD 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 3 distinct

Callsign Airline Flights Last seen
ABF2 - 43 2026-06-26
OHSWJ - 2 2026-06-10
ABF2A - 2 2026-05-19

Recent flights last 47

DateFlightRouteTakeoffLandingDuration
2026-06-26 ABF2 HEL → BMA Jun 26, 13:15 UTCJun 26, 14:05 UTC50m
2026-06-25 ABF2 HEL → HEL Jun 25, 05:00 UTCJun 25, 07:19 UTC2h 20m
2026-06-21 ABF2 - Jun 21, 10:29 UTCJun 21, 11:24 UTC55m
2026-06-21 ABF2 HEL → OUL Jun 21, 04:44 UTCJun 21, 05:35 UTC50m
2026-06-20 ABF2 - Jun 20, 06:45 UTCJun 20, 07:54 UTC1h 10m
2026-06-20 ABF2 - Jun 20, 04:09 UTCJun 20, 05:34 UTC1h 25m
2026-06-19 ABF2 - Jun 19, 23:00 UTCJun 20, 00:14 UTC1h 15m
2026-06-19 ABF2 - Jun 19, 19:59 UTCJun 19, 21:14 UTC1h 15m
2026-06-16 ABF2 ARN → HEL Jun 16, 22:50 UTCJun 16, 23:40 UTC50m
2026-06-16 ABF2 NCE → ARN Jun 16, 19:00 UTCJun 16, 22:00 UTC3h 1m
2026-06-16 ABF2 - Jun 16, 05:10 UTCJun 16, 08:00 UTC2h 50m
2026-06-15 ABF2 HEL → BMA Jun 15, 15:25 UTCJun 15, 16:04 UTC40m
2026-06-13 ABF2 - Jun 13, 13:50 UTCJun 13, 15:05 UTC1h 15m
2026-06-13 ABF2 HEL → OSL Jun 13, 10:45 UTCJun 13, 12:00 UTC1h 15m
2026-06-11 ABF2 - Jun 11, 20:20 UTCJun 11, 23:05 UTC2h 45m
2026-06-10 ABF2 - Jun 10, 12:35 UTCJun 10, 12:50 UTC15m
2026-06-10 ABF2 TLL → LTN Jun 10, 05:40 UTCJun 10, 08:45 UTC3h 5m
2026-06-10 OHSWJ HEL → TLL Jun 10, 03:50 UTCJun 10, 04:10 UTC20m
2026-06-08 ABF2 - Jun 8, 14:35 UTCJun 8, 15:15 UTC40m
2026-06-08 ABF2 - Jun 8, 06:50 UTCJun 8, 07:25 UTC35m
2026-06-07 ABF2 SOF → HEL Jun 7, 11:50 UTCJun 7, 14:45 UTC2h 55m
2026-06-05 ABF2 HEL → SOF Jun 5, 13:10 UTCJun 5, 16:15 UTC3h 5m
2026-06-04 ABF2 - Jun 4, 15:55 UTCJun 4, 16:55 UTC1h 0m
2026-06-04 ABF2 HEL → OUL Jun 4, 12:25 UTCJun 4, 13:20 UTC55m
2026-06-01 ABF2 ZRH → HEL Jun 1, 06:00 UTCJun 1, 08:50 UTC2h 50m
2026-05-31 ABF2 HEL → ZRH May 31, 14:00 UTCMay 31, 16:50 UTC2h 50m
2026-05-30 ABF2 - May 30, 15:05 UTCMay 30, 15:45 UTC40m
2026-05-30 ABF2 HEL → KUO May 30, 09:25 UTCMay 30, 10:00 UTC35m
2026-05-29 OHSWJ - May 29, 18:20 UTCMay 29, 18:35 UTC15m
2026-05-29 ABF2 HEL → TLL May 29, 17:45 UTCMay 29, 18:05 UTC20m
2026-05-26 ABF2 - May 26, 15:54 UTCMay 26, 16:45 UTC50m
2026-05-26 ABF2 - May 26, 05:59 UTCMay 26, 06:59 UTC1h 0m
2026-05-21 ABF2 - May 21, 08:05 UTCMay 21, 09:45 UTC1h 40m
2026-05-21 ABF2 - May 21, 04:00 UTCMay 21, 06:50 UTC2h 50m
2026-05-20 ABF2 HEL → HEL May 20, 07:00 UTCMay 20, 09:05 UTC2h 5m
2026-05-19 ABF2A - May 19, 10:05 UTCMay 19, 12:00 UTC1h 55m
2026-05-19 ABF2A - May 19, 08:00 UTCMay 19, 09:30 UTC1h 30m
2026-05-19 ABF2 HEL → HEL May 19, 04:55 UTCMay 19, 07:05 UTC2h 10m
2026-05-17 ABF2 - May 17, 18:50 UTCMay 17, 19:30 UTC40m
2026-05-17 ABF2 - May 17, 15:15 UTCMay 17, 18:10 UTC2h 55m
2026-05-14 ABF2 NCE → CEQ May 14, 12:30 UTCMay 14, 12:50 UTC20m
2026-05-13 ABF2 - May 13, 16:15 UTCMay 13, 19:15 UTC3h 0m
2026-05-13 ABF2 HEL → BMA May 13, 09:15 UTCMay 13, 11:55 UTC2h 40m
2026-05-10 ABF2 - May 10, 11:25 UTCMay 10, 12:05 UTC40m
2026-05-10 ABF2 - May 10, 06:25 UTCMay 10, 06:55 UTC30m
2026-05-09 ABF2 TLL → HEL May 9, 10:50 UTCMay 9, 11:10 UTC20m
2026-05-09 ABF2 HEL → TLL May 9, 04:55 UTCMay 9, 05:10 UTC15m

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

Mode-S 4631CD frequently asked

What is Mode-S code 4631CD?
4631CD is an ICAO 24-bit transponder address. Allocated to Finland. Assigned to OH-SWJ.
Where is Mode-S 4631CD registered?
Mode-S code 4631CD is allocated to Finland (FI). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4631CD broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4631CD, octal 21430715, decimal 4,600,269.
What flights does 4631CD operate?
Mode-S 4631CD has broadcast 3 distinct callsigns, including ABF2, OHSWJ, ABF2A.