sensors Mode-S transponder

4AC9E2

ICAO 24-bit transponder address · allocated to Sweden

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

Hex
4AC9E2
Octal
22544742
Decimal
4,901,346
Country
SE
Tail
SE-ROB
Type
A20N
No current signal · last broadcast 15h ago
Flights observed
13
Distinct callsigns
7
Country
SE
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 4AC9E2.

Country allocation

The ICAO 24-bit address 4AC9E2 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 7 distinct

Callsign Airline Flights Last seen
SAS2774 - 3 2026-04-13
SAS2773 - 3 2026-04-13
SAS2865 Scandinavian Airlines System 2 2026-04-14
SAS2862 Scandinavian Airlines System 2 2026-04-14
SAS67L - 1 2026-04-12
SAS449 - 1 2026-04-13
SAS1444 - 1 2026-04-13

Recent flights last 13

DateFlightRouteTakeoffLandingDuration
2026-04-14 SAS2865 BGO → CPH Apr 14, 09:10 UTCApr 14, 09:35 UTC25m
2026-04-14 SAS2865 BGO → CPH Apr 14, 08:30 UTCApr 14, 09:05 UTC35m
2026-04-14 SAS2862 CPH → BGO Apr 14, 07:10 UTCApr 14, 07:35 UTC25m
2026-04-14 SAS2862 CPH → BGO Apr 14, 06:30 UTCApr 14, 07:10 UTC40m
2026-04-13 SAS449 - Apr 13, 18:45 UTCApr 13, 19:15 UTC30m
2026-04-13 SAS1444 - Apr 13, 17:25 UTCApr 13, 17:50 UTC25m
2026-04-13 SAS2774 - Apr 13, 12:20 UTCApr 13, 14:10 UTC1h 50m
2026-04-13 SAS2774 - Apr 13, 11:55 UTCApr 13, 14:10 UTC2h 15m
2026-04-13 SAS2774 - Apr 13, 11:15 UTCApr 13, 12:15 UTC1h 0m
2026-04-13 SAS2773 - Apr 13, 08:20 UTCApr 13, 10:05 UTC1h 45m
2026-04-13 SAS2773 - Apr 13, 07:55 UTCApr 13, 10:05 UTC2h 10m
2026-04-13 SAS2773 - Apr 13, 07:00 UTCApr 13, 08:15 UTC1h 15m
2026-04-12 SAS67L - Apr 12, 17:25 UTCApr 12, 18:30 UTC1h 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-ROB page for operator, model, and routing details .

Mode-S 4AC9E2 frequently asked

What is Mode-S code 4AC9E2?
4AC9E2 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-ROB.
Where is Mode-S 4AC9E2 registered?
Mode-S code 4AC9E2 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AC9E2 broadcasting right now?
No active broadcast right now. Last signal was 15h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AC9E2, octal 22544742, decimal 4,901,346.
What flights does 4AC9E2 operate?
Mode-S 4AC9E2 has broadcast 7 distinct callsigns, including SAS2774, SAS2773, SAS2865, SAS2862, SAS67L.