Apparatus

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sensors Mode-S transponder

4AC9E1

ICAO 24-bit transponder address · allocated to Sweden

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

Hex
4AC9E1
Octal
22544741
Decimal
4,901,345
Country
SE
Tail
SE-ROA
Type
A20N
Broadcasting now · callsign SAS7929 · 37,000 ft
Flights observed
278
Distinct callsigns
20
Country
SE
Last broadcast
51m ago

Current position

4AC9E1 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4AC9E1 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
SAS2678 Scandinavian Airlines System 5 2026-05-29
SAS2677 Scandinavian Airlines System 5 2026-05-29
SAS2065 Scandinavian Airlines System 5 2026-05-28
SAS2064 Scandinavian Airlines System 5 2026-05-28
SAS780 Scandinavian Airlines System 4 2026-04-23
SAS779 Scandinavian Airlines System 4 2026-04-23
SAS751 Scandinavian Airlines System 4 2026-04-16
SAS52R Scandinavian Airlines System 4 2026-04-16
SAS51H Scandinavian Airlines System 4 2026-04-23
SAS46C Scandinavian Airlines System 4 2026-05-26
SAS22Y Scandinavian Airlines System 4 2026-05-26
SAS2062 Scandinavian Airlines System 4 2026-05-27
SAS1916 Scandinavian Airlines System 4 2026-05-23
SAS075 Scandinavian Airlines System 4 2026-05-28
SAS010 Scandinavian Airlines System 4 2026-05-26
SAS88K Scandinavian Airlines System 3 2026-05-25
SAS85Y Scandinavian Airlines System 3 2026-05-25
SAS82K Scandinavian Airlines System 3 2026-05-27
SAS2822 - 3 2026-04-14
SAS2821 - 3 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 SAS7929 ARN → JSI May 30, 05:15 UTCMay 30, 06:15 UTC1h 0m
2026-05-29 SAS021 LLA → ARN May 29, 19:40 UTCMay 29, 20:40 UTC1h 0m
2026-05-29 SAS97T ARN → LLA May 29, 18:00 UTCMay 29, 19:00 UTC1h 0m
2026-05-29 SAS31A LLA → ARN May 29, 15:45 UTCMay 29, 16:40 UTC55m
2026-05-29 SAS12B ARN → LLA May 29, 13:50 UTCMay 29, 14:50 UTC1h 0m
2026-05-29 SAS30P LLA → ARN May 29, 11:55 UTCMay 29, 12:50 UTC55m
2026-05-29 SAS69H ARN → LLA May 29, 10:05 UTCMay 29, 11:05 UTC1h 0m
2026-05-29 SAS2678 BER → ARN May 29, 07:30 UTCMay 29, 08:55 UTC1h 25m
2026-05-29 SAS2677 ARN → BER May 29, 05:20 UTCMay 29, 06:30 UTC1h 10m
2026-05-28 SAS725 HEL → ARN May 28, 18:40 UTCMay 28, 19:25 UTC45m
2026-05-28 SAS722 ARN → HEL May 28, 17:05 UTCMay 28, 17:45 UTC40m
2026-05-28 SAS2065 OSD → ARN May 28, 14:10 UTCMay 28, 15:00 UTC50m
2026-05-28 SAS2064 ARN → OSD May 28, 12:40 UTCMay 28, 13:30 UTC50m
2026-05-28 SAS2546 EDI → ARN May 28, 09:30 UTCMay 28, 11:25 UTC1h 55m
2026-05-28 SAS2545 ARN → EDI May 28, 06:20 UTCMay 28, 08:20 UTC2h 0m
2026-05-28 SAS075 OSD → ARN May 28, 04:10 UTCMay 28, 04:55 UTC45m
2026-05-27 SAS2062 ARN → OSD May 27, 21:10 UTCMay 27, 21:55 UTC45m
2026-05-27 SAS1488 OSL → ARN May 27, 19:20 UTCMay 27, 20:00 UTC40m
2026-05-27 SAS493 ARN → OSL May 27, 17:45 UTCMay 27, 18:35 UTC50m
2026-05-27 SAS488 OSL → ARN May 27, 16:10 UTCMay 27, 16:50 UTC40m
2026-05-27 SAS491 ARN → OSL May 27, 14:25 UTCMay 27, 15:10 UTC45m
2026-05-27 SAS68L KRN → ARN May 27, 12:05 UTCMay 27, 13:25 UTC1h 20m
2026-05-27 SAS50F ARN → KRN May 27, 10:05 UTCMay 27, 11:15 UTC1h 10m
2026-05-27 SAS80A GOT → ARN May 27, 08:20 UTCMay 27, 09:10 UTC50m
2026-05-27 SAS71L ARN → GOT May 27, 06:44 UTCMay 27, 07:30 UTC46m
2026-05-27 SAS82K LLA → ARN May 27, 04:09 UTCMay 27, 05:14 UTC1h 5m
2026-05-26 SAS22Y ARN → LLA May 26, 19:45 UTCMay 26, 20:40 UTC55m
2026-05-26 SAS126 MMX → ARN May 26, 17:55 UTCMay 26, 18:45 UTC50m
2026-05-26 SAS121 ARN → MMX May 26, 16:24 UTCMay 26, 17:15 UTC50m
2026-05-26 SAS46C LLA → ARN May 26, 13:50 UTCMay 26, 15:00 UTC1h 10m
2026-05-26 SAS010 ARN → LLA May 26, 12:00 UTCMay 26, 13:00 UTC1h 0m
2026-05-26 SAS2678 BER → ARN May 26, 09:40 UTCMay 26, 11:05 UTC1h 25m
2026-05-26 SAS2677 ARN → BER May 26, 07:15 UTCMay 26, 08:34 UTC1h 20m
2026-05-26 SAS83L LLA → ARN May 26, 05:10 UTCMay 26, 06:14 UTC1h 5m
2026-05-25 SAS22Y ARN → LLA May 25, 19:50 UTCMay 25, 20:50 UTC1h 0m
2026-05-25 SAS126 MMX → ARN May 25, 17:50 UTCMay 25, 18:35 UTC45m
2026-05-25 SAS121 ARN → MMX May 25, 16:05 UTCMay 25, 16:55 UTC50m
2026-05-25 SAS2065 OSD → ARN May 25, 13:55 UTCMay 25, 14:35 UTC40m
2026-05-25 SAS2064 ARN → OSD May 25, 12:20 UTCMay 25, 13:15 UTC55m
2026-05-25 SAS88K CDG → ARN May 25, 08:45 UTCMay 25, 10:45 UTC2h 0m
2026-05-25 SAS85Y OSL → BCN May 25, 05:00 UTCMay 25, 07:20 UTC2h 20m
2026-05-24 SAS015 LLA → ARN May 24, 21:05 UTCMay 24, 21:50 UTC45m
2026-05-24 SAS014 ARN → LLA May 24, 19:20 UTCMay 24, 20:20 UTC1h 0m
2026-05-24 SAS886 OSL → ARN May 24, 17:35 UTCMay 24, 18:20 UTC45m
2026-05-24 SAS885 ARN → OSL May 24, 15:50 UTCMay 24, 16:40 UTC50m
2026-05-24 SAS84B UME → ARN May 24, 09:50 UTCMay 24, 10:35 UTC45m
2026-05-24 SAS2026 ARN → UME May 24, 08:15 UTCMay 24, 08:50 UTC35m
2026-05-23 SAS1916 FLR → ARN May 23, 17:15 UTCMay 23, 19:35 UTC2h 20m
2026-05-23 SAS1916 FLR → ARN May 23, 15:55 UTCMay 23, 16:15 UTC20m
2026-05-23 SAS1915 ARN → FLR May 23, 11:50 UTCMay 23, 14:20 UTC2h 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-ROA page for operator, model, and routing details .

Mode-S 4AC9E1 frequently asked

What is Mode-S code 4AC9E1?
4AC9E1 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-ROA.
Where is Mode-S 4AC9E1 registered?
Mode-S code 4AC9E1 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AC9E1 broadcasting right now?
Yes. Mode-S 4AC9E1 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AC9E1, octal 22544741, decimal 4,901,345.
What flights does 4AC9E1 operate?
Mode-S 4AC9E1 has broadcast 20 distinct callsigns, including SAS2678, SAS2677, SAS2065, SAS2064, SAS780.