Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 21:30 UTC
Flights observed
195
Distinct callsigns
13
Country
SE
Last broadcast
Jul 26, 21:30 UTC

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 13 distinct

Callsign Airline Flights Last seen
SAS987 Scandinavian Airlines System 25 2026-07-23
SAS988 Scandinavian Airlines System 23 2026-07-23
SAS935 Scandinavian Airlines System 23 2026-07-26
SAS983 - 19 2026-07-21
SAS936 Scandinavian Airlines System 19 2026-07-20
SAS926 Scandinavian Airlines System 19 2026-07-21
SAS925 - 18 2026-07-20
SAS984 - 17 2026-07-22
SAS938 - 8 2026-07-18
SAS937 - 8 2026-07-17
SAS930 Scandinavian Airlines System 6 2026-07-25
SAS929 Scandinavian Airlines System 6 2026-07-25
SPTUG - 2 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SAS935 CPH → SFO Jul 26, 11:05 UTCJul 26, 21:30 UTC10h 25m
2026-07-25 SAS930 ATL → CPH Jul 25, 23:45 UTCJul 26, 07:45 UTC8h 1m
2026-07-25 SAS929 CPH → ATL Jul 25, 11:45 UTCJul 25, 20:40 UTC8h 55m
2026-07-25 SAS930 ATL → CPH Jul 25, 00:00 UTCJul 25, 07:50 UTC7h 50m
2026-07-24 SAS929 CPH → ATL Jul 24, 11:45 UTCJul 24, 21:05 UTC9h 20m
2026-07-23 SAS988 ICN → CPH Jul 23, 15:55 UTCJul 24, 03:20 UTC11h 25m
2026-07-23 SAS988 ICN → CPH Jul 23, 14:45 UTCJul 23, 15:10 UTC25m
2026-07-23 SAS987 CPH → ICN Jul 23, 09:00 UTCJul 23, 09:25 UTC25m
2026-07-22 SAS987 CPH → ICN Jul 22, 22:05 UTCJul 23, 08:15 UTC10h 10m
2026-07-22 SAS984 HND → CPH Jul 22, 02:35 UTCJul 22, 15:05 UTC12h 30m
2026-07-21 SAS983 CPH → HND Jul 21, 11:00 UTCJul 21, 23:00 UTC12h 0m
2026-07-21 SAS926 IAD → CPH Jul 21, 00:45 UTCJul 21, 08:00 UTC7h 15m
2026-07-20 SAS925 CPH → IAD Jul 20, 12:45 UTCJul 20, 20:55 UTC8h 10m
2026-07-20 SAS936 SFO → CPH Jul 20, 00:00 UTCJul 20, 09:30 UTC9h 30m
2026-07-19 SAS935 CPH → SFO Jul 19, 11:00 UTCJul 19, 21:35 UTC10h 35m
2026-07-18 SAS930 ATL → CPH Jul 18, 23:50 UTCJul 19, 07:45 UTC7h 55m
2026-07-18 SAS929 CPH → ATL Jul 18, 11:50 UTCJul 18, 21:05 UTC9h 15m
2026-07-18 SAS938 SEA → CPH Jul 18, 00:10 UTCJul 18, 08:40 UTC8h 31m
2026-07-17 SAS937 CPH → SEA Jul 17, 11:25 UTCJul 17, 20:44 UTC9h 20m
2026-07-17 SAS930 ATL → CPH Jul 17, 00:10 UTCJul 17, 08:20 UTC8h 10m
2026-07-16 SAS929 CPH → ATL Jul 16, 11:54 UTCJul 16, 20:39 UTC8h 45m
2026-07-16 SAS926 IAD → CPH Jul 16, 00:30 UTCJul 16, 07:55 UTC7h 25m
2026-07-15 SAS925 CPH → IAD Jul 15, 12:45 UTCJul 15, 20:55 UTC8h 10m
2026-07-15 SAS936 SFO → CPH Jul 15, 00:25 UTCJul 15, 10:05 UTC9h 40m
2026-07-14 SAS935 CPH → SFO Jul 14, 11:00 UTCJul 14, 21:55 UTC10h 55m
2026-07-14 SAS926 IAD → CPH Jul 14, 00:20 UTCJul 14, 07:50 UTC7h 30m
2026-07-13 SAS925 CPH → IAD Jul 13, 13:10 UTCJul 13, 21:05 UTC7h 55m
2026-07-13 SAS936 SFO → CPH Jul 13, 00:55 UTCJul 13, 10:30 UTC9h 35m
2026-07-12 SAS935 CPH → SFO Jul 12, 11:30 UTCJul 12, 22:25 UTC10h 55m
2026-07-11 SAS938 SEA → CPH Jul 11, 23:35 UTCJul 12, 08:05 UTC8h 30m
2026-07-11 SAS937 CPH → SEA Jul 11, 11:25 UTCJul 11, 20:35 UTC9h 10m
2026-07-10 SAS938 SEA → CPH Jul 10, 23:35 UTCJul 11, 08:05 UTC8h 30m
2026-07-10 SAS937 CPH → SEA Jul 10, 11:30 UTCJul 10, 20:30 UTC9h 0m
2026-07-10 SAS926 IAD → CPH Jul 10, 00:50 UTCJul 10, 08:00 UTC7h 10m
2026-07-09 SAS925 CPH → IAD Jul 9, 12:50 UTCJul 9, 21:50 UTC9h 0m
2026-07-09 SAS936 - Jul 9, 00:45 UTCJul 9, 10:25 UTC9h 40m
2026-07-08 SAS935 CPH → SFO Jul 8, 11:40 UTCJul 8, 22:25 UTC10h 45m
2026-07-05 SAS938 - Jul 5, 23:30 UTCJul 6, 08:00 UTC8h 30m
2026-07-05 SAS937 - Jul 5, 11:15 UTCJul 5, 20:30 UTC9h 15m
2026-07-04 SAS988 - Jul 4, 14:40 UTCJul 5, 03:15 UTC12h 35m
2026-07-04 SAS987 - Jul 4, 09:00 UTCJul 4, 09:20 UTC20m
2026-07-03 SAS987 - Jul 3, 22:30 UTCJul 4, 08:15 UTC9h 45m
2026-07-03 SAS984 HND → CPH Jul 3, 02:45 UTCJul 3, 15:40 UTC12h 55m
2026-07-02 SAS983 CPH → NRT Jul 2, 11:30 UTCJul 3, 00:05 UTC12h 35m
2026-07-01 SAS988 - Jul 1, 15:55 UTCJul 2, 03:05 UTC11h 10m
2026-07-01 SAS988 - Jul 1, 14:45 UTCJul 1, 15:05 UTC20m
2026-07-01 SAS987 - Jul 1, 09:00 UTCJul 1, 09:25 UTC25m
2026-07-01 SAS987 - Jul 1, 07:45 UTCJul 1, 08:15 UTC30m
2026-07-01 - - Jul 1, 02:55 UTCJul 1, 03:10 UTC15m
2026-06-30 SAS987 - Jun 30, 22:20 UTCJul 1, 02:10 UTC3h 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 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 Jul 26, 21:30 UTC.
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 13 distinct callsigns, including SAS987, SAS988, SAS935, SAS983, SAS936.