Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 1h ago
Flights observed
122
Distinct callsigns
8
Country
SE
Last broadcast
1h 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 8 distinct

Callsign Airline Flights Last seen
SAS949 Scandinavian Airlines System 39 2026-05-11
SAS950 Scandinavian Airlines System 32 2026-05-11
SAS908 Scandinavian Airlines System 13 2026-05-29
SAS924 Scandinavian Airlines System 12 2026-05-26
SAS907 Scandinavian Airlines System 12 2026-05-29
SAS923 Scandinavian Airlines System 11 2026-05-26
SAS9202 Scandinavian Airlines System 2 2026-05-12
SAS455 Scandinavian Airlines System 1 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 SAS908 EWR → OSL May 29, 22:20 UTCMay 29, 23:55 UTC1h 35m
2026-05-29 SAS907 OSL → EWR May 29, 09:05 UTCMay 29, 16:40 UTC7h 35m
2026-05-28 SAS908 EWR → OSL May 28, 22:35 UTCMay 29, 05:45 UTC7h 10m
2026-05-28 SAS907 OSL → EWR May 28, 09:15 UTCMay 28, 16:55 UTC7h 40m
2026-05-27 SAS908 EWR → OSL May 27, 22:25 UTCMay 28, 05:15 UTC6h 50m
2026-05-27 SAS907 OSL → EWR May 27, 09:00 UTCMay 27, 17:10 UTC8h 10m
2026-05-26 SAS924 CPH → IAD May 26, 21:34 UTCMay 27, 04:19 UTC6h 45m
2026-05-26 SAS923 IAD → CPH May 26, 11:24 UTCMay 26, 19:40 UTC8h 15m
2026-05-25 SAS908 EWR → OSL May 25, 22:05 UTCMay 26, 04:45 UTC6h 40m
2026-05-25 SAS907 OSL → EWR May 25, 09:25 UTCMay 25, 17:30 UTC8h 5m
2026-05-24 SAS924 CPH → IAD May 24, 23:00 UTCMay 25, 05:30 UTC6h 30m
2026-05-24 SAS923 IAD → CPH May 24, 11:35 UTCMay 24, 19:30 UTC7h 55m
2026-05-23 SAS924 CPH → IAD May 23, 22:00 UTCMay 24, 04:45 UTC6h 45m
2026-05-23 SAS923 IAD → CPH May 23, 11:40 UTCMay 23, 19:40 UTC8h 1m
2026-05-22 SAS924 CPH → IAD May 22, 21:45 UTCMay 23, 04:25 UTC6h 40m
2026-05-22 SAS923 IAD → CPH May 22, 11:45 UTCMay 22, 19:40 UTC7h 55m
2026-05-21 SAS924 CPH → IAD May 21, 21:55 UTCMay 22, 04:35 UTC6h 40m
2026-05-21 SAS923 IAD → CPH May 21, 11:25 UTCMay 21, 19:30 UTC8h 5m
2026-05-20 SAS924 CPH → IAD May 20, 23:15 UTCMay 21, 04:30 UTC5h 15m
2026-05-20 SAS924 CPH → IAD May 20, 21:45 UTCMay 20, 23:10 UTC1h 25m
2026-05-20 SAS923 IAD → CPH May 20, 11:40 UTCMay 20, 19:25 UTC7h 45m
2026-05-19 SAS924 CPH → IAD May 19, 22:35 UTCMay 20, 05:50 UTC7h 16m
2026-05-19 SAS923 IAD → CPH May 19, 11:45 UTCMay 19, 19:20 UTC7h 35m
2026-05-18 SAS908 EWR → OSL May 18, 21:55 UTCMay 19, 05:10 UTC7h 15m
2026-05-18 SAS907 OSL → EWR May 18, 09:05 UTCMay 18, 16:30 UTC7h 25m
2026-05-17 SAS908 EWR → OSL May 17, 22:20 UTCMay 18, 05:30 UTC7h 10m
2026-05-17 SAS907 OSL → EWR May 17, 08:50 UTCMay 17, 16:30 UTC7h 40m
2026-05-17 SAS908 EWR → OSL May 17, 02:35 UTCMay 17, 05:00 UTC2h 25m
2026-05-16 SAS908 EWR → OSL May 16, 22:05 UTCMay 16, 23:25 UTC1h 20m
2026-05-16 SAS907 OSL → EWR May 16, 09:01 UTCMay 16, 16:31 UTC7h 30m
2026-05-15 SAS908 EWR → OSL May 15, 22:00 UTCMay 16, 05:05 UTC7h 5m
2026-05-15 SAS907 OSL → EWR May 15, 08:55 UTCMay 15, 16:35 UTC7h 39m
2026-05-14 SAS908 EWR → OSL May 14, 22:15 UTCMay 15, 05:00 UTC6h 45m
2026-05-14 SAS907 OSL → EWR May 14, 09:10 UTCMay 14, 17:15 UTC8h 5m
2026-05-13 SAS924 CPH → IAD May 13, 22:10 UTCMay 14, 05:05 UTC6h 55m
2026-05-13 SAS923 IAD → CPH May 13, 11:30 UTCMay 13, 19:30 UTC8h 0m
2026-05-12 SAS9202 CPH → LFW May 12, 08:45 UTCMay 12, 09:35 UTC50m
2026-05-11 SAS950 YYZ → CPH May 11, 21:50 UTCMay 12, 04:40 UTC6h 50m
2026-05-11 SAS949 CPH → YYZ May 11, 11:35 UTCMay 11, 20:00 UTC8h 26m
2026-05-10 SAS950 YYZ → CPH May 10, 21:49 UTCMay 11, 04:50 UTC7h 0m
2026-05-10 SAS949 CPH → YYZ May 10, 11:20 UTCMay 10, 19:50 UTC8h 30m
2026-05-09 SAS950 YYZ → CPH May 9, 21:19 UTCMay 10, 04:39 UTC7h 20m
2026-05-09 SAS949 CPH → YYZ May 9, 11:10 UTCMay 9, 19:30 UTC8h 20m
2026-05-08 SAS950 YYZ → CPH May 8, 21:25 UTCMay 9, 04:35 UTC7h 10m
2026-05-08 SAS949 CPH → YYZ May 8, 11:09 UTCMay 8, 19:40 UTC8h 30m
2026-05-07 SAS950 YYZ → CPH May 7, 21:25 UTCMay 8, 04:49 UTC7h 25m
2026-05-07 SAS949 CPH → YYZ May 7, 11:20 UTCMay 7, 19:35 UTC8h 15m
2026-05-06 SAS950 YYZ → CPH May 6, 21:25 UTCMay 7, 04:20 UTC6h 55m
2026-05-06 SAS949 CPH → YYZ May 6, 11:15 UTCMay 6, 19:35 UTC8h 19m
2026-05-05 SAS950 YYZ → CPH May 5, 21:25 UTCMay 6, 04:30 UTC7h 5m

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 1h 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 8 distinct callsigns, including SAS949, SAS950, SAS908, SAS924, SAS907.