Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 16:00 UTC
Flights observed
565
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 16:00 UTC

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
SAS61A Scandinavian Airlines System 4 2026-07-25
SAS58E Scandinavian Airlines System 4 2026-07-25
SAS56H Scandinavian Airlines System 4 2026-06-18
SAS54C Scandinavian Airlines System 4 2026-07-21
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SAS1850 PMO → ARN Jul 26, 12:55 UTCJul 26, 15:50 UTC2h 55m
2026-07-26 SAS9231 SVG → BGO Jul 26, 11:15 UTCJul 26, 11:40 UTC25m
2026-07-26 SAS1849 ARN → PMO Jul 26, 05:15 UTCJul 26, 09:05 UTC3h 51m
2026-07-25 SAS1818 AGP → ARN Jul 25, 18:50 UTCJul 25, 22:35 UTC3h 45m
2026-07-25 SAS1817 ARN → AGP Jul 25, 13:20 UTCJul 25, 17:25 UTC4h 5m
2026-07-25 SAS61A CPH → ARN Jul 25, 11:15 UTCJul 25, 12:10 UTC55m
2026-07-25 SAS1421 ARN → CPH Jul 25, 09:05 UTCJul 25, 10:00 UTC55m
2026-07-25 SAS58E CPH → ARN Jul 25, 07:05 UTCJul 25, 08:00 UTC55m
2026-07-24 SAS39G FLR → CPH Jul 24, 18:30 UTCJul 24, 20:30 UTC2h 0m
2026-07-24 SAS86N CPH → FLR Jul 24, 15:25 UTCJul 24, 17:15 UTC1h 50m
2026-07-24 SAS2518 BRI → CPH Jul 24, 07:40 UTCJul 24, 10:10 UTC2h 30m
2026-07-24 SAS2517 CPH → BRI Jul 24, 04:20 UTCJul 24, 06:15 UTC1h 55m
2026-07-23 SAS1796 VAR → CPH Jul 23, 18:55 UTCJul 23, 21:20 UTC2h 25m
2026-07-23 SAS1795 CPH → VAR Jul 23, 15:25 UTCJul 23, 17:30 UTC2h 5m
2026-07-23 SAS53T CPH → FAE Jul 23, 09:40 UTCJul 23, 14:20 UTC4h 40m
2026-07-22 SAS2674 TIV → CPH Jul 22, 17:35 UTCJul 22, 19:45 UTC2h 10m
2026-07-22 SAS2673 CPH → TIV Jul 22, 14:20 UTCJul 22, 16:05 UTC1h 45m
2026-07-22 SAS47D ZAD → CPH Jul 22, 11:10 UTCJul 22, 13:00 UTC1h 50m
2026-07-22 SAS1415 ARN → CPH Jul 22, 04:15 UTCJul 22, 05:10 UTC55m
2026-07-21 SAS1428 CPH → ARN Jul 21, 21:40 UTCJul 21, 22:40 UTC1h 0m
2026-07-21 SAS39C ARN → CPH Jul 21, 17:40 UTCJul 21, 18:30 UTC50m
2026-07-21 SAS1408 CPH → ARN Jul 21, 15:20 UTCJul 21, 16:15 UTC55m
2026-07-21 SAS1407 ARN → CPH Jul 21, 13:20 UTCJul 21, 14:15 UTC55m
2026-07-21 SAS61A CPH → ARN Jul 21, 11:15 UTCJul 21, 12:15 UTC1h 0m
2026-07-21 SAS1421 ARN → CPH Jul 21, 09:05 UTCJul 21, 10:00 UTC55m
2026-07-21 SAS58E CPH → ARN Jul 21, 07:10 UTCJul 21, 08:05 UTC55m
2026-07-21 SAS54C ARN → CPH Jul 21, 05:10 UTCJul 21, 06:00 UTC50m
2026-07-20 SAS1804 AGP → ARN Jul 20, 18:25 UTCJul 20, 22:10 UTC3h 45m
2026-07-20 SAS245E ARN → AGP Jul 20, 13:10 UTCJul 20, 17:05 UTC3h 55m
2026-07-20 SAS92L SKG → ARN Jul 20, 08:50 UTCJul 20, 11:40 UTC2h 50m
2026-07-20 SAS63D ARN → SKG Jul 20, 04:40 UTCJul 20, 07:30 UTC2h 50m
2026-07-19 SAS1484 OSL → ARN Jul 19, 16:20 UTCJul 19, 17:05 UTC45m
2026-07-19 SAS499 ARN → OSL Jul 19, 14:30 UTCJul 19, 15:10 UTC40m
2026-07-19 SAS7644 RHO → ARN Jul 19, 09:10 UTCJul 19, 12:45 UTC3h 35m
2026-07-19 SAS43L ARN → RHO Jul 19, 04:15 UTCJul 19, 07:50 UTC3h 35m
2026-07-18 SAS1818 AGP → ARN Jul 18, 18:55 UTCJul 18, 22:45 UTC3h 50m
2026-07-18 SAS1817 - Jul 18, 13:40 UTCJul 18, 17:45 UTC4h 5m
2026-07-18 SAS61A CPH → ARN Jul 18, 11:10 UTCJul 18, 12:00 UTC50m
2026-07-18 SAS1421 ARN → CPH Jul 18, 09:00 UTCJul 18, 10:00 UTC1h 0m
2026-07-18 SAS58E CPH → ARN Jul 18, 07:10 UTCJul 18, 07:55 UTC45m
2026-07-18 SAS54C ARN → CPH Jul 18, 05:15 UTCJul 18, 06:05 UTC50m
2026-07-17 SAS1410 CPH → ARN Jul 17, 20:04 UTCJul 17, 20:55 UTC50m
2026-07-17 SAS39C ARN → CPH Jul 17, 17:35 UTCJul 17, 18:25 UTC50m
2026-07-17 SAS1491 - Jul 17, 14:39 UTCJul 17, 16:19 UTC1h 40m
2026-07-17 SAS1492 - Jul 17, 12:04 UTCJul 17, 13:25 UTC1h 20m
2026-07-17 SAS76H MAN → ARN Jul 17, 08:40 UTCJul 17, 10:35 UTC1h 55m
2026-07-17 SAS61E ARN → ZRH Jul 17, 05:15 UTCJul 17, 07:14 UTC2h 0m
2026-07-16 SAS1600 - Jul 16, 18:55 UTCJul 16, 20:39 UTC1h 45m
2026-07-16 SAS64A ARN → BRU Jul 16, 16:05 UTCJul 16, 17:49 UTC1h 45m
2026-07-16 SAS68L - Jul 16, 13:45 UTCJul 16, 15:00 UTC1h 15m

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 Jul 26, 16:00 UTC.
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.