sensors Mode-S transponder

4ACA73

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RSS · EMBRAER ERJ-190-200

Hex
4ACA73
Octal
22545163
Decimal
4,901,491
Country
SE
Tail
SE-RSS
Type
E195
No current signal · last broadcast 15h ago
Flights observed
17
Distinct callsigns
13
Country
SE
Last broadcast
15h ago

Last known position

Most recent position reported by Mode-S 4ACA73.

Country allocation

The ICAO 24-bit address 4ACA73 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 13 distinct

Callsign Airline Flights Last seen
SAS59J - 2 2026-04-13
SAS2749 - 2 2026-04-13
SAS1868 Scandinavian Airlines System 2 2026-04-13
SAS1207 Scandinavian Airlines System 2 2026-04-14
SAS42Y - 1 2026-04-13
SAS1875 - 1 2026-04-13
SAS1870 - 1 2026-04-13
SAS1869 - 1 2026-04-13
SAS1794 - 1 2026-04-12
SAS1793 - 1 2026-04-12
SAS1212 Scandinavian Airlines System 1 2026-04-14
SAS1211 Scandinavian Airlines System 1 2026-04-14
SAS1208 Scandinavian Airlines System 1 2026-04-14

Recent flights last 17

DateFlightRouteTakeoffLandingDuration
2026-04-14 SAS1212 AAL → CPH Apr 14, 10:45 UTCApr 14, 11:05 UTC20m
2026-04-14 SAS1211 CPH → AAL Apr 14, 09:30 UTCApr 14, 10:00 UTC30m
2026-04-14 SAS1208 AAL → CPH Apr 14, 08:05 UTCApr 14, 08:35 UTC30m
2026-04-14 SAS1207 CPH → AAL Apr 14, 07:10 UTCApr 14, 07:20 UTC10m
2026-04-14 SAS1207 CPH → AAL Apr 14, 06:50 UTCApr 14, 07:10 UTC20m
2026-04-13 SAS42Y - Apr 13, 17:45 UTCApr 13, 18:40 UTC55m
2026-04-13 SAS59J - Apr 13, 16:15 UTCApr 13, 16:55 UTC40m
2026-04-13 SAS59J - Apr 13, 15:45 UTCApr 13, 16:15 UTC30m
2026-04-13 SAS1869 - Apr 13, 13:25 UTCApr 13, 14:15 UTC50m
2026-04-13 SAS1868 CPH → SVG Apr 13, 11:55 UTCApr 13, 12:10 UTC15m
2026-04-13 SAS1868 CPH → SVG Apr 13, 11:30 UTCApr 13, 12:10 UTC40m
2026-04-13 SAS1875 - Apr 13, 08:35 UTCApr 13, 09:25 UTC50m
2026-04-13 SAS1870 - Apr 13, 06:55 UTCApr 13, 07:50 UTC55m
2026-04-13 SAS2749 - Apr 13, 04:20 UTCApr 13, 05:05 UTC45m
2026-04-13 SAS2749 - Apr 13, 04:00 UTCApr 13, 04:15 UTC15m
2026-04-12 SAS1794 LYS → CPH Apr 12, 18:25 UTCApr 12, 20:15 UTC1h 50m
2026-04-12 SAS1793 - Apr 12, 17:15 UTCApr 12, 17:25 UTC10m

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

Mode-S 4ACA73 frequently asked

What is Mode-S code 4ACA73?
4ACA73 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RSS.
Where is Mode-S 4ACA73 registered?
Mode-S code 4ACA73 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA73 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 4ACA73, octal 22545163, decimal 4,901,491.
What flights does 4ACA73 operate?
Mode-S 4ACA73 has broadcast 13 distinct callsigns, including SAS59J, SAS2749, SAS1868, SAS1207, SAS42Y.