Apparatus

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sensors Mode-S transponder

4AC9EF

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-ROO · AIRBUS A-320neo

Hex
4AC9EF
Octal
22544757
Decimal
4,901,359
Country
SE
Tail
SE-ROO
Type
A20N
No current signal · last broadcast 6h ago
Flights observed
507
Distinct callsigns
20
Country
SE
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S 4AC9EF.

Country allocation

The ICAO 24-bit address 4AC9EF 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 20 distinct

Callsign Airline Flights Last seen
SAS1228 Scandinavian Airlines System 6 2026-06-04
SAS87Y Scandinavian Airlines System 5 2026-06-03
SAS792 - 5 2026-07-03
SAS2874 Scandinavian Airlines System 5 2026-05-18
SAS2861 Scandinavian Airlines System 5 2026-05-19
SAS1488 - 5 2026-07-12
SAS1225 Scandinavian Airlines System 5 2026-06-03
SAS751 Scandinavian Airlines System 4 2026-05-19
SAS71G Scandinavian Airlines System 4 2026-05-27
SAS69H - 4 2026-06-16
SAS56H Scandinavian Airlines System 4 2026-06-18
SAS52R Scandinavian Airlines System 4 2026-05-19
SAS493 - 4 2026-06-16
SAS44D - 4 2026-07-09
SAS42R Scandinavian Airlines System 4 2026-06-03
SAS31T - 4 2026-07-02
SAS31A Scandinavian Airlines System 4 2026-06-16
SAS30P - 4 2026-06-16
SAS2865 Scandinavian Airlines System 4 2026-05-17
SAS2862 Scandinavian Airlines System 4 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SAS1572 - Jul 14, 10:10 UTCJul 14, 13:50 UTC3h 40m
2026-07-14 SAS1571 ARN → ALC Jul 14, 05:00 UTCJul 14, 08:50 UTC3h 50m
2026-07-13 SAS1804 - Jul 13, 18:20 UTCJul 13, 22:00 UTC3h 40m
2026-07-13 SAS245E - Jul 13, 13:00 UTCJul 13, 17:05 UTC4h 5m
2026-07-13 SAS92L SKG → ARN Jul 13, 08:45 UTCJul 13, 11:50 UTC3h 5m
2026-07-13 SAS63D ARN → SKG Jul 13, 04:35 UTCJul 13, 07:35 UTC3h 0m
2026-07-12 SAS1488 OSL → ARN Jul 12, 19:50 UTCJul 12, 20:30 UTC40m
2026-07-12 SAS1483 ARN → OSL Jul 12, 18:01 UTCJul 12, 18:45 UTC45m
2026-07-12 SAS1408 CPH → ARN Jul 12, 15:30 UTCJul 12, 16:20 UTC50m
2026-07-12 SAS1407 ARN → CPH Jul 12, 13:40 UTCJul 12, 14:35 UTC55m
2026-07-12 SAS61A CPH → ARN Jul 12, 11:40 UTCJul 12, 12:30 UTC50m
2026-07-12 SAS1421 ARN → CPH Jul 12, 09:15 UTCJul 12, 10:10 UTC55m
2026-07-12 SAS58E CPH → ARN Jul 12, 07:01 UTCJul 12, 07:50 UTC50m
2026-07-12 SAS54C ARN → CPH Jul 12, 05:05 UTCJul 12, 06:01 UTC55m
2026-07-11 SAS1818 - Jul 11, 19:05 UTCJul 11, 22:50 UTC3h 45m
2026-07-11 SAS1817 - Jul 11, 13:15 UTCJul 11, 17:15 UTC4h 0m
2026-07-10 SAS2690 MXP → ARN Jul 10, 18:35 UTCJul 10, 21:00 UTC2h 25m
2026-07-10 SAS2689 ARN → MXP Jul 10, 14:50 UTCJul 10, 17:10 UTC2h 20m
2026-07-09 SAS58M LIN → ARN Jul 9, 11:05 UTCJul 9, 13:30 UTC2h 25m
2026-07-09 SAS63Z ARN → LIN Jul 9, 07:40 UTCJul 9, 09:50 UTC2h 10m
2026-07-09 SAS44D CPH → ARN Jul 9, 05:20 UTCJul 9, 06:15 UTC55m
2026-07-08 SAS34Y - Jul 8, 17:45 UTCJul 8, 19:40 UTC1h 55m
2026-07-08 SAS182Y - Jul 8, 14:15 UTCJul 8, 16:35 UTC2h 20m
2026-07-08 SAS2620 - Jul 8, 10:40 UTCJul 8, 12:00 UTC1h 20m
2026-07-08 SAS2619 - Jul 8, 08:15 UTCJul 8, 09:25 UTC1h 10m
2026-07-08 SAS91A ARN → CPH Jul 8, 06:15 UTCJul 8, 07:05 UTC50m
2026-07-08 SAS400 CPH → ARN Jul 8, 04:10 UTCJul 8, 05:05 UTC55m
2026-07-07 SAS1910 - Jul 7, 16:45 UTCJul 7, 19:05 UTC2h 20m
2026-07-07 SAS1909 - Jul 7, 13:00 UTCJul 7, 15:20 UTC2h 20m
2026-07-07 SAS7438 - Jul 7, 08:10 UTCJul 7, 11:35 UTC3h 25m
2026-07-07 SAS7437 - Jul 7, 04:00 UTCJul 7, 06:50 UTC2h 50m
2026-07-06 SAS1562 - Jul 6, 17:35 UTCJul 6, 19:40 UTC2h 5m
2026-07-06 SAS1561 - Jul 6, 14:15 UTCJul 6, 16:15 UTC2h 0m
2026-07-05 SAS688 MXP → CPH Jul 5, 19:20 UTCJul 5, 21:05 UTC1h 45m
2026-07-05 SAS687 - Jul 5, 16:05 UTCJul 5, 17:55 UTC1h 50m
2026-07-05 SAS461 OSL → CPH Jul 5, 14:15 UTCJul 5, 15:10 UTC55m
2026-07-05 SAS464 - Jul 5, 12:30 UTCJul 5, 13:20 UTC50m
2026-07-05 SAS33D - Jul 5, 08:45 UTCJul 5, 11:30 UTC2h 45m
2026-07-05 SAS69P - Jul 5, 04:15 UTCJul 5, 06:50 UTC2h 35m
2026-07-04 SAS588 - Jul 4, 18:30 UTCJul 4, 21:55 UTC3h 25m
2026-07-04 SAS63Y - Jul 4, 13:40 UTCJul 4, 17:00 UTC3h 20m
2026-07-04 SAS47D - Jul 4, 09:05 UTCJul 4, 11:35 UTC2h 30m
2026-07-04 SAS81L - Jul 4, 04:50 UTCJul 4, 06:55 UTC2h 5m
2026-07-03 SAS792 NCE → CPH Jul 3, 19:20 UTCJul 3, 21:35 UTC2h 15m
2026-07-03 SAS791 - Jul 3, 16:05 UTCJul 3, 18:15 UTC2h 10m
2026-07-03 SAS53T - Jul 3, 09:40 UTCJul 3, 14:40 UTC5h 0m
2026-07-03 SAS22H ARN → CPH Jul 3, 07:10 UTCJul 3, 08:05 UTC55m
2026-07-03 SAS44D - Jul 3, 05:15 UTCJul 3, 06:10 UTC55m
2026-07-02 SAS10E - Jul 2, 18:10 UTCJul 2, 19:50 UTC1h 40m
2026-07-02 SAS31T - Jul 2, 15:10 UTCJul 2, 17:00 UTC1h 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-ROO page for operator, model, and routing details .

Mode-S 4AC9EF frequently asked

What is Mode-S code 4AC9EF?
4AC9EF is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-ROO.
Where is Mode-S 4AC9EF registered?
Mode-S code 4AC9EF is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AC9EF broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AC9EF, octal 22544757, decimal 4,901,359.
What flights does 4AC9EF operate?
Mode-S 4AC9EF has broadcast 20 distinct callsigns, including SAS1228, SAS87Y, SAS792, SAS2874, SAS2861.