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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
Broadcasting now · callsign SAS924 · 33,125 ft
Flights observed
238
Distinct callsigns
9
Country
SE
Last broadcast
Jul 26, 22:20 UTC

Current position

4A91B3 is currently broadcasting. Map zoomed to live position.

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 Scandinavian Airlines System 53 2026-07-26
SAS950 Scandinavian Airlines System 45 2026-07-26
SAS924 Scandinavian Airlines System 36 2026-07-20
SAS923 - 35 2026-07-20
SAS908 - 33 2026-07-15
SAS907 - 30 2026-07-15
SAS9202 Scandinavian Airlines System 3 2026-06-23
SAS9201 Scandinavian Airlines System 2 2026-07-21
SAS455 Scandinavian Airlines System 1 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SAS950 YYZ → CPH Jul 26, 21:25 UTCJul 26, 22:20 UTC55m
2026-07-26 SAS949 CPH → YYZ Jul 26, 11:15 UTCJul 26, 19:10 UTC7h 55m
2026-07-25 SAS950 YYZ → CPH Jul 25, 21:30 UTCJul 26, 04:25 UTC6h 55m
2026-07-25 SAS949 CPH → YYZ Jul 25, 11:10 UTCJul 25, 19:20 UTC8h 10m
2026-07-24 SAS950 YYZ → CPH Jul 24, 21:15 UTCJul 25, 04:10 UTC6h 55m
2026-07-24 SAS949 CPH → YYZ Jul 24, 11:05 UTCJul 24, 19:30 UTC8h 25m
2026-07-23 SAS950 YYZ → CPH Jul 23, 21:40 UTCJul 24, 04:30 UTC6h 50m
2026-07-23 SAS949 CPH → YYZ Jul 23, 11:15 UTCJul 23, 20:00 UTC8h 45m
2026-07-22 SAS950 YYZ → CPH Jul 22, 21:40 UTCJul 23, 04:45 UTC7h 5m
2026-07-22 SAS949 CPH → YYZ Jul 22, 11:20 UTCJul 22, 19:40 UTC8h 20m
2026-07-21 SAS950 YYZ → CPH Jul 21, 23:35 UTCJul 22, 05:25 UTC5h 50m
2026-07-21 SAS949 CPH → YYZ Jul 21, 15:55 UTCJul 21, 21:40 UTC5h 45m
2026-07-21 SAS949 CPH → YYZ Jul 21, 11:20 UTCJul 21, 14:35 UTC3h 15m
2026-07-21 SAS9201 CPH → OSL Jul 21, 06:35 UTCJul 21, 07:25 UTC50m
2026-07-20 SAS924 CPH → IAD Jul 20, 21:55 UTCJul 21, 04:40 UTC6h 45m
2026-07-20 SAS923 - Jul 20, 11:35 UTCJul 20, 19:30 UTC7h 55m
2026-07-19 SAS924 CPH → IAD Jul 19, 22:25 UTCJul 20, 04:55 UTC6h 30m
2026-07-19 SAS923 - Jul 19, 11:35 UTCJul 19, 19:40 UTC8h 5m
2026-07-18 SAS924 CPH → IAD Jul 18, 23:25 UTCJul 19, 06:00 UTC6h 35m
2026-07-18 SAS923 - Jul 18, 11:30 UTCJul 18, 19:40 UTC8h 10m
2026-07-17 SAS924 CPH → IAD Jul 17, 22:00 UTCJul 18, 04:50 UTC6h 51m
2026-07-17 SAS923 OSL → JFK Jul 17, 11:30 UTCJul 17, 19:35 UTC8h 5m
2026-07-16 SAS924 CPH → IAD Jul 16, 22:10 UTCJul 17, 04:54 UTC6h 45m
2026-07-16 SAS923 - Jul 16, 11:40 UTCJul 16, 19:25 UTC7h 45m
2026-07-15 SAS908 - Jul 15, 23:05 UTCJul 16, 06:00 UTC6h 55m
2026-07-15 SAS907 OSL → EWR Jul 15, 09:10 UTCJul 15, 16:55 UTC7h 45m
2026-07-13 SAS924 - Jul 13, 22:15 UTCJul 14, 05:10 UTC6h 55m
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

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?
Yes. Mode-S 4A91B3 is currently airborne.
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, SAS924, SAS923, SAS908.