Apparatus

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sensors Mode-S transponder

4ACA66

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RSF · AIRBUS A-350-900

Hex
4ACA66
Octal
22545146
Decimal
4,901,478
Country
SE
Tail
SE-RSF
Type
A359
No current signal · last broadcast 4d ago
Flights observed
88
Distinct callsigns
11
Country
SE
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S 4ACA66.

Country allocation

The ICAO 24-bit address 4ACA66 falls within the block assigned to Sweden (SE) by ICAO Annex 10, Volume III. Every aircraft registered in Sweden 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 11 distinct

Callsign Airline Flights Last seen
SAS988 Scandinavian Airlines System 13 2026-05-21
SAS987 Scandinavian Airlines System 12 2026-05-21
SAS983 Scandinavian Airlines System 11 2026-05-19
SAS935 Scandinavian Airlines System 11 2026-05-23
SAS984 Scandinavian Airlines System 10 2026-05-20
SAS926 Scandinavian Airlines System 10 2026-05-25
SAS936 Scandinavian Airlines System 8 2026-05-24
SAS925 Scandinavian Airlines System 8 2026-05-24
SPTUG - 2 2026-05-20
SAS938 Scandinavian Airlines System 1 2026-05-22
SAS937 Scandinavian Airlines System 1 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-25 SAS926 IAD → CPH May 25, 01:55 UTCMay 25, 07:45 UTC5h 50m
2026-05-24 SAS925 CPH → IAD May 24, 12:50 UTCMay 24, 20:55 UTC8h 5m
2026-05-24 SAS936 SFO → CPH May 24, 00:10 UTCMay 24, 09:50 UTC9h 40m
2026-05-23 SAS935 CPH → SFO May 23, 11:10 UTCMay 23, 21:30 UTC10h 21m
2026-05-22 SAS938 ARN → AES May 22, 23:30 UTCMay 23, 08:10 UTC8h 39m
2026-05-22 SAS937 SEA → CPH May 22, 11:35 UTCMay 22, 20:40 UTC9h 5m
2026-05-21 SAS988 ICN → CPH May 21, 16:01 UTCMay 22, 03:35 UTC11h 35m
2026-05-21 SAS988 ICN → CPH May 21, 14:45 UTCMay 21, 15:00 UTC15m
2026-05-21 SAS987 CPH → ICN May 21, 09:05 UTCMay 21, 09:30 UTC25m
2026-05-20 SAS987 CPH → ICN May 20, 22:15 UTCMay 21, 08:15 UTC10h 0m
2026-05-20 SPTUG - May 20, 20:35 UTCMay 20, 20:50 UTC15m
2026-05-20 SPTUG - May 20, 17:45 UTCMay 20, 18:10 UTC25m
2026-05-20 SAS984 HND → CPH May 20, 02:25 UTCMay 20, 15:25 UTC13h 1m
2026-05-19 SAS983 CPH → NRT May 19, 10:55 UTCMay 19, 23:35 UTC12h 40m
2026-05-17 SAS984 HND → CPH May 17, 02:40 UTCMay 17, 15:40 UTC13h 0m
2026-05-16 SAS983 CPH → NRT May 16, 10:55 UTCMay 16, 23:40 UTC12h 45m
2026-05-16 SAS926 IAD → CPH May 16, 00:35 UTCMay 16, 07:51 UTC7h 16m
2026-05-15 SAS925 CPH → IAD May 15, 19:05 UTCMay 15, 20:40 UTC1h 35m
2026-05-15 - - May 15, 16:55 UTCMay 15, 17:05 UTC10m
2026-05-15 SAS925 CPH → IAD May 15, 12:45 UTCMay 15, 15:35 UTC2h 49m
2026-05-15 SAS936 SFO → CPH May 15, 00:40 UTCMay 15, 10:15 UTC9h 35m
2026-05-14 SAS935 CPH → SFO May 14, 11:05 UTCMay 14, 21:30 UTC10h 25m
2026-05-11 SAS988 ICN → CPH May 11, 19:55 UTCMay 12, 03:25 UTC7h 30m
2026-05-11 SAS988 ICN → CPH May 11, 15:05 UTCMay 11, 15:20 UTC15m
2026-05-10 SAS987 CPH → ICN May 10, 22:09 UTCMay 11, 02:25 UTC4h 15m
2026-05-10 SAS984 HND → CPH May 10, 02:24 UTCMay 10, 15:09 UTC12h 45m
2026-05-09 SAS983 CPH → NRT May 9, 11:05 UTCMay 9, 23:25 UTC12h 20m
2026-05-08 SAS988 ICN → CPH May 8, 16:05 UTCMay 9, 03:35 UTC11h 30m
2026-05-08 SAS988 ICN → CPH May 8, 14:50 UTCMay 8, 15:05 UTC15m
2026-05-07 SAS987 CPH → ICN May 7, 22:10 UTCMay 8, 08:14 UTC10h 4m
2026-05-07 SAS984 HND → CPH May 7, 02:50 UTCMay 7, 15:40 UTC12h 50m
2026-05-06 SAS983 CPH → NRT May 6, 11:00 UTCMay 6, 23:25 UTC12h 24m
2026-05-05 SAS926 IAD → CPH May 5, 00:30 UTCMay 5, 07:50 UTC7h 20m
2026-05-04 SAS925 CPH → IAD May 4, 12:40 UTCMay 4, 20:35 UTC7h 56m
2026-05-04 SAS936 SFO → CPH May 4, 00:19 UTCMay 4, 10:15 UTC9h 55m
2026-05-03 SAS935 CPH → SFO May 3, 11:20 UTCMay 3, 21:29 UTC10h 10m
2026-05-03 SAS926 IAD → CPH May 3, 05:05 UTCMay 3, 07:45 UTC2h 40m
2026-05-03 SAS926 IAD → CPH May 3, 00:35 UTCMay 3, 02:15 UTC1h 40m
2026-05-02 SAS925 CPH → IAD May 2, 12:40 UTCMay 2, 20:55 UTC8h 15m
2026-05-02 SAS936 SFO → CPH May 2, 00:20 UTCMay 2, 09:55 UTC9h 35m
2026-05-01 SAS935 CPH → SFO May 1, 11:00 UTCMay 1, 21:30 UTC10h 30m
2026-05-01 SAS926 IAD → CPH May 1, 00:30 UTCMay 1, 07:45 UTC7h 15m
2026-04-30 SAS925 CPH → IAD Apr 30, 12:35 UTCApr 30, 20:45 UTC8h 10m
2026-04-29 SAS984 HND → CPH Apr 29, 04:39 UTCApr 29, 17:20 UTC12h 41m
2026-04-28 SAS983 CPH → NRT Apr 28, 11:10 UTCApr 28, 23:25 UTC12h 15m
2026-04-27 SAS988 ICN → CPH Apr 27, 14:45 UTCApr 28, 04:05 UTC13h 20m
2026-04-27 SAS987 CPH → ICN Apr 27, 08:40 UTCApr 27, 09:00 UTC20m
2026-04-26 SAS987 CPH → ICN Apr 26, 22:00 UTCApr 27, 07:45 UTC9h 45m
2026-04-26 SAS984 HND → CPH Apr 26, 02:50 UTCApr 26, 15:30 UTC12h 40m
2026-04-25 SAS983 CPH → NRT Apr 25, 11:25 UTCApr 25, 23:55 UTC12h 30m

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 SE-RSF page for operator, model, and routing details .

Mode-S 4ACA66 frequently asked

What is Mode-S code 4ACA66?
4ACA66 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RSF.
Where is Mode-S 4ACA66 registered?
Mode-S code 4ACA66 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA66 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA66, octal 22545146, decimal 4,901,478.
What flights does 4ACA66 operate?
Mode-S 4ACA66 has broadcast 11 distinct callsigns, including SAS988, SAS987, SAS983, SAS935, SAS984.