Apparatus

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sensors Mode-S transponder

4A91B3

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-DMS · AIRBUS A-321neo

Hex
4A91B3
Octal
22510663
Decimal
4,886,963
Country
SE
Tail
SE-DMS
Type
A21N
No current signal · last broadcast 53m ago
Flights observed
212
Distinct callsigns
9
Country
SE
Last broadcast
53m ago

Last known position

Most recent position reported by Mode-S 4A91B3.

Country allocation

The ICAO 24-bit address 4A91B3 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 9 distinct

Callsign Airline Flights Last seen
SAS949 - 46 2026-06-22
SAS950 - 39 2026-06-22
SAS908 - 32 2026-07-12
SAS924 - 31 2026-07-13
SAS923 - 30 2026-07-13
SAS907 - 29 2026-07-12
SAS9202 Scandinavian Airlines System 3 2026-06-23
SAS9201 Scandinavian Airlines System 1 2026-06-16
SAS455 Scandinavian Airlines System 1 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SAS924 - Jul 13, 22:15 UTCJul 14, 02:45 UTC4h 30m
2026-07-13 SAS923 OSL → JFK Jul 13, 11:40 UTCJul 13, 19:15 UTC7h 35m
2026-07-12 SAS908 EWR → OSL Jul 12, 21:50 UTCJul 13, 05:01 UTC7h 10m
2026-07-12 SAS907 - Jul 12, 09:00 UTCJul 12, 16:40 UTC7h 40m
2026-07-11 SAS908 EWR → OSL Jul 11, 22:01 UTCJul 12, 04:45 UTC6h 45m
2026-07-11 SAS907 OSL → EWR Jul 11, 09:00 UTCJul 11, 17:20 UTC8h 20m
2026-07-10 SAS908 - Jul 10, 22:40 UTCJul 11, 05:25 UTC6h 45m
2026-07-10 SAS907 - Jul 10, 09:00 UTCJul 10, 16:55 UTC7h 55m
2026-07-09 SAS908 EWR → OSL Jul 9, 22:20 UTCJul 10, 05:05 UTC6h 45m
2026-07-09 SAS907 OSL → EWR Jul 9, 09:05 UTCJul 9, 17:00 UTC7h 55m
2026-07-08 SAS908 - Jul 8, 22:15 UTCJul 9, 05:00 UTC6h 45m
2026-07-08 SAS907 OSL → EWR Jul 8, 09:05 UTCJul 8, 16:55 UTC7h 50m
2026-07-07 SAS924 JFK → OSL Jul 7, 21:50 UTCJul 8, 04:45 UTC6h 55m
2026-07-07 SAS923 OSL → JFK Jul 7, 11:35 UTCJul 7, 19:20 UTC7h 45m
2026-07-06 SAS908 EWR → OSL Jul 6, 22:50 UTCJul 7, 05:25 UTC6h 35m
2026-07-06 SAS907 OSL → EWR Jul 6, 09:05 UTCJul 6, 16:55 UTC7h 50m
2026-07-05 SAS924 JFK → OSL Jul 5, 21:55 UTCJul 6, 04:20 UTC6h 25m
2026-07-05 SAS923 - Jul 5, 11:25 UTCJul 5, 19:20 UTC7h 55m
2026-07-04 SAS924 JFK → OSL Jul 4, 21:55 UTCJul 5, 04:35 UTC6h 40m
2026-07-04 SAS923 - Jul 4, 12:00 UTCJul 4, 19:55 UTC7h 55m
2026-07-03 SAS924 JFK → OSL Jul 3, 22:00 UTCJul 4, 04:40 UTC6h 40m
2026-07-03 SAS923 - Jul 3, 11:35 UTCJul 3, 19:25 UTC7h 50m
2026-07-02 SAS924 JFK → OSL Jul 2, 21:50 UTCJul 3, 04:40 UTC6h 50m
2026-07-02 SAS923 OSL → JFK Jul 2, 11:45 UTCJul 2, 19:30 UTC7h 45m
2026-07-01 SAS908 - Jul 1, 22:05 UTCJul 2, 05:00 UTC6h 55m
2026-07-01 SAS907 - Jul 1, 09:10 UTCJul 1, 16:45 UTC7h 35m
2026-06-30 SAS924 - Jun 30, 21:35 UTCJul 1, 04:40 UTC7h 5m
2026-06-30 SAS923 OSL → JFK Jun 30, 11:45 UTCJun 30, 19:15 UTC7h 30m
2026-06-29 SAS908 - Jun 29, 22:10 UTCJun 30, 05:00 UTC6h 51m
2026-06-29 SAS907 OSL → EWR Jun 29, 09:05 UTCJun 29, 16:19 UTC7h 15m
2026-06-28 SAS924 - Jun 28, 21:40 UTCJun 29, 04:30 UTC6h 50m
2026-06-28 SAS923 OSL → JFK Jun 28, 11:39 UTCJun 28, 19:20 UTC7h 40m
2026-06-27 SAS924 JFK → OSL Jun 27, 21:40 UTCJun 28, 04:29 UTC6h 50m
2026-06-27 SAS923 OSL → JFK Jun 27, 11:30 UTCJun 27, 19:05 UTC7h 35m
2026-06-26 SAS924 JFK → OSL Jun 26, 21:45 UTCJun 27, 04:34 UTC6h 50m
2026-06-26 SAS923 - Jun 26, 11:34 UTCJun 26, 19:39 UTC8h 5m
2026-06-25 SAS924 - Jun 25, 22:10 UTCJun 26, 04:50 UTC6h 40m
2026-06-25 SAS923 - Jun 25, 11:54 UTCJun 25, 19:54 UTC8h 0m
2026-06-24 SAS924 JFK → OSL Jun 24, 21:54 UTCJun 25, 04:20 UTC6h 25m
2026-06-24 SAS923 OSL → JFK Jun 24, 11:34 UTCJun 24, 19:49 UTC8h 15m
2026-06-23 SAS9202 CPH → LFW Jun 23, 08:39 UTCJun 23, 09:34 UTC55m
2026-06-22 SAS950 YYZ → CPH Jun 22, 21:45 UTCJun 23, 04:50 UTC7h 5m
2026-06-22 SAS949 - Jun 22, 11:19 UTCJun 22, 19:44 UTC8h 25m
2026-06-21 SAS950 YYZ → CPH Jun 21, 21:44 UTCJun 22, 05:15 UTC7h 30m
2026-06-21 SAS949 CPH → YYZ Jun 21, 11:20 UTCJun 21, 19:34 UTC8h 15m
2026-06-20 SAS950 YYZ → CPH Jun 20, 21:34 UTCJun 21, 04:49 UTC7h 15m
2026-06-20 SAS949 - Jun 20, 11:20 UTCJun 20, 19:19 UTC8h 0m
2026-06-19 SAS950 - Jun 19, 21:24 UTCJun 20, 04:44 UTC7h 20m
2026-06-19 SAS949 - Jun 19, 11:20 UTCJun 19, 19:09 UTC7h 50m
2026-06-18 SAS950 YYZ → CPH Jun 18, 21:20 UTCJun 19, 04:44 UTC7h 24m

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-DMS page for operator, model, and routing details .

Mode-S 4A91B3 frequently asked

What is Mode-S code 4A91B3?
4A91B3 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-DMS.
Where is Mode-S 4A91B3 registered?
Mode-S code 4A91B3 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4A91B3 broadcasting right now?
No active broadcast right now. Last signal was 53m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4A91B3, octal 22510663, decimal 4,886,963.
What flights does 4A91B3 operate?
Mode-S 4A91B3 has broadcast 9 distinct callsigns, including SAS949, SAS950, SAS908, SAS924, SAS923.