sensors Mode-S transponder

4ACA8E

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTN · BOEING 737 MAX 8

Hex
4ACA8E
Octal
22545216
Decimal
4,901,518
Country
SE
Tail
SE-RTN
Type
B38M
No current signal · last broadcast 14h ago
Flights observed
9
Distinct callsigns
5
Country
SE
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S 4ACA8E.

Country allocation

The ICAO 24-bit address 4ACA8E 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 5 distinct

Callsign Airline Flights Last seen
NSZ6BG - 3 2026-04-13
NSZ5708 - 2 2026-04-13
NOZ90L Norwegian Air Shuttle AOC AS 2 2026-04-14
NOZ636 - 1 2026-04-12
NOZ57GW - 1 2026-04-12

Recent flights last 9

DateFlightRouteTakeoffLandingDuration
2026-04-14 NOZ90L OSL → LCA Apr 14, 07:10 UTCApr 14, 08:45 UTC1h 35m
2026-04-14 NOZ90L OSL → LCA Apr 14, 05:15 UTCApr 14, 07:10 UTC1h 55m
2026-04-13 NSZ5708 - Apr 13, 19:50 UTCApr 13, 21:45 UTC1h 55m
2026-04-13 NSZ5708 - Apr 13, 16:45 UTCApr 13, 20:10 UTC3h 25m
2026-04-13 NSZ6BG - Apr 13, 12:20 UTCApr 13, 14:45 UTC2h 25m
2026-04-13 NSZ6BG - Apr 13, 11:55 UTCApr 13, 14:45 UTC2h 50m
2026-04-13 NSZ6BG - Apr 13, 09:45 UTCApr 13, 12:15 UTC2h 30m
2026-04-12 NOZ636 OSL → BGO Apr 12, 19:10 UTCApr 12, 19:50 UTC40m
2026-04-12 NOZ57GW - Apr 12, 17:15 UTCApr 12, 18:25 UTC1h 10m

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

Mode-S 4ACA8E frequently asked

What is Mode-S code 4ACA8E?
4ACA8E is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTN.
Where is Mode-S 4ACA8E registered?
Mode-S code 4ACA8E is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA8E broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA8E, octal 22545216, decimal 4,901,518.
What flights does 4ACA8E operate?
Mode-S 4ACA8E has broadcast 5 distinct callsigns, including NSZ6BG, NSZ5708, NOZ90L, NOZ636, NOZ57GW.