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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 1h ago
Flights observed
170
Distinct callsigns
13
Country
SE
Last broadcast
1h 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 13 distinct

Callsign Airline Flights Last seen
SAS987 - 23 2026-07-04
SAS988 - 21 2026-07-04
SAS935 - 20 2026-07-12
SAS983 Scandinavian Airlines System 18 2026-07-02
SAS936 - 17 2026-07-13
SAS926 - 17 2026-07-14
SAS984 Scandinavian Airlines System 16 2026-07-03
SAS925 - 16 2026-07-13
SAS938 - 7 2026-07-11
SAS937 - 7 2026-07-11
SPTUG - 2 2026-05-20
SAS930 - 2 2026-06-22
SAS929 Scandinavian Airlines System 2 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SAS926 - Jul 14, 00:20 UTCJul 14, 01:30 UTC1h 10m
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
2026-06-30 SAS984 HND → CPH Jun 30, 02:35 UTCJun 30, 15:30 UTC12h 55m
2026-06-29 SAS983 CPH → NRT Jun 29, 11:10 UTCJun 29, 23:09 UTC12h 0m
2026-06-28 SAS938 SEA → CPH Jun 28, 23:20 UTCJun 29, 08:19 UTC9h 0m
2026-06-28 SAS937 - Jun 28, 11:45 UTCJun 28, 20:25 UTC8h 40m
2026-06-27 SAS938 - Jun 27, 23:39 UTCJun 28, 08:34 UTC8h 55m
2026-06-27 SAS937 - Jun 27, 11:44 UTCJun 27, 20:39 UTC8h 55m
2026-06-25 SAS988 - Jun 25, 16:05 UTCJun 26, 03:39 UTC11h 35m
2026-06-25 SAS988 - Jun 25, 14:55 UTCJun 25, 15:10 UTC15m
2026-06-25 SAS987 - Jun 25, 08:40 UTCJun 25, 09:05 UTC25m
2026-06-24 SAS987 - Jun 24, 22:14 UTCJun 25, 07:54 UTC9h 40m
2026-06-24 SAS984 HND → CPH Jun 24, 02:40 UTCJun 24, 15:29 UTC12h 50m
2026-06-23 SAS983 CPH → NRT Jun 23, 10:59 UTCJun 23, 23:00 UTC12h 0m
2026-06-22 SAS930 ATL → CPH Jun 22, 23:55 UTCJun 23, 07:45 UTC7h 50m
2026-06-22 SAS929 CPH → ATL Jun 22, 12:05 UTCJun 22, 21:10 UTC9h 5m
2026-06-22 SAS926 IAD → CPH Jun 22, 00:29 UTCJun 22, 07:34 UTC7h 5m
2026-06-21 SAS925 CPH → IAD Jun 21, 12:49 UTCJun 21, 20:50 UTC8h 0m
2026-06-21 SAS936 SFO → CPH Jun 21, 00:10 UTCJun 21, 09:59 UTC9h 50m
2026-06-20 SAS935 CPH → SFO Jun 20, 10:59 UTCJun 20, 21:05 UTC10h 5m
2026-06-19 SAS930 ATL → CPH Jun 19, 23:54 UTCJun 20, 07:44 UTC7h 50m
2026-06-19 SAS929 CPH → ATL Jun 19, 12:44 UTCJun 19, 21:30 UTC8h 45m
2026-06-19 SAS936 - Jun 19, 00:20 UTCJun 19, 10:14 UTC9h 55m
2026-06-18 SAS935 CPH → SFO Jun 18, 11:10 UTCJun 18, 21:25 UTC10h 15m
2026-06-17 SAS984 HND → CPH Jun 17, 02:30 UTCJun 17, 15:15 UTC12h 45m
2026-06-16 SAS983 CPH → NRT Jun 16, 11:00 UTCJun 16, 23:30 UTC12h 31m
2026-06-16 SAS926 IAD → CPH Jun 16, 00:29 UTCJun 16, 07:40 UTC7h 10m

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 1h 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 13 distinct callsigns, including SAS987, SAS988, SAS935, SAS983, SAS936.