Apparatus

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sensors Mode-S transponder

4ACA15

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RPU · BOEING 737-800

Hex
4ACA15
Octal
22545025
Decimal
4,901,397
Country
SE
Tail
SE-RPU
Type
B738
Broadcasting now · callsign NSZ64N · 38,000 ft
Flights observed
251
Distinct callsigns
20
Country
SE
Last broadcast
7h ago

Current position

4ACA15 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA15 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 20 distinct

Callsign Airline Flights Last seen
NSZ5GT Norwegian Air Sweden AOC 20 2026-04-26
NSZ6FY Norwegian Air Sweden AOC 19 2026-04-26
NSZ5611 Norwegian Air Sweden AOC 8 2026-04-26
NSZ5610 Norwegian Air Sweden AOC 6 2026-04-26
NSZ5619 Norwegian Air Sweden AOC 5 2026-04-25
NSZ5618 Norwegian Air Sweden AOC 5 2026-04-25
NSZ8MV Norwegian Air Sweden AOC 4 2026-05-20
NSZ8CM Norwegian Air Sweden AOC 4 2026-04-25
NSZ2RT Norwegian Air Sweden AOC 4 2026-05-20
NSZ3221 Norwegian Air Sweden AOC 3 2026-05-13
NSZ3211 Norwegian Air Sweden AOC 3 2026-05-18
NSZ3210 Norwegian Air Sweden AOC 3 2026-05-18
NSZ9MC Norwegian Air Sweden AOC 2 2026-05-10
NSZ9GY Norwegian Air Sweden AOC 2 2026-05-21
NSZ9BH Norwegian Air Sweden AOC 2 2026-05-21
NSZ8YZ Norwegian Air Sweden AOC 2 2026-05-19
NSZ8FI Norwegian Air Sweden AOC 2 2026-05-21
NSZ82F Norwegian Air Sweden AOC 2 2026-05-15
NSZ7WJ Norwegian Air Sweden AOC 2 2026-05-12
NSZ74Q Norwegian Air Sweden AOC 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 NSZ3521 LGW → CPH May 29, 20:15 UTCMay 29, 21:30 UTC1h 15m
2026-05-29 NSZ3520 CPH → LGW May 29, 17:40 UTCMay 29, 19:20 UTC1h 40m
2026-05-29 NSZ3207 ARN → CPH May 29, 15:45 UTCMay 29, 16:40 UTC55m
2026-05-29 NSZ3206 CPH → ARN May 29, 14:00 UTCMay 29, 15:05 UTC1h 5m
2026-05-29 NSZ1KS AGP → CPH May 29, 09:40 UTCMay 29, 13:05 UTC3h 25m
2026-05-29 NSZ6PY CPH → AGP May 29, 05:05 UTCMay 29, 08:10 UTC3h 5m
2026-05-28 NSZ3705 MAD → CPH May 28, 18:45 UTCMay 28, 21:25 UTC2h 40m
2026-05-28 NSZ3704 CPH → MAD May 28, 14:30 UTCMay 28, 17:20 UTC2h 50m
2026-05-28 NSZ3563 KRK → CPH May 28, 12:10 UTCMay 28, 13:30 UTC1h 20m
2026-05-28 NSZ3807 ARN → KRK May 28, 10:00 UTCMay 28, 11:20 UTC1h 20m
2026-05-28 NSZ3806 KRK → ARN May 28, 07:20 UTCMay 28, 09:05 UTC1h 45m
2026-05-28 NSZ3562 CPH → KRK May 28, 05:15 UTCMay 28, 06:10 UTC55m
2026-05-27 NSZ7VR PSA → CPH May 27, 20:25 UTCMay 27, 22:20 UTC1h 55m
2026-05-27 NSZ6UK CPH → PSA May 27, 17:40 UTCMay 27, 19:35 UTC1h 55m
2026-05-27 NSZ8923 ALC → BCN May 27, 15:55 UTCMay 27, 16:45 UTC50m
2026-05-27 NSZ56J FCO → ARN May 27, 09:05 UTCMay 27, 11:50 UTC2h 45m
2026-05-27 NSZ5NE ARN → FCO May 27, 05:09 UTCMay 27, 07:50 UTC2h 41m
2026-05-26 NSZ4354 AMS → ARN May 26, 20:24 UTCMay 26, 21:55 UTC1h 30m
2026-05-26 NSZ4353 ARN → AMS May 26, 17:30 UTCMay 26, 19:15 UTC1h 45m
2026-05-26 NSZ2MP NCE → ARN May 26, 13:40 UTCMay 26, 16:20 UTC2h 40m
2026-05-26 NSZ3YT ARN → NCE May 26, 09:40 UTCMay 26, 12:30 UTC2h 50m
2026-05-26 NSZ8GH UME → ARN May 26, 08:04 UTCMay 26, 08:45 UTC40m
2026-05-26 NSZ5B ARN → UME May 26, 06:29 UTCMay 26, 07:10 UTC40m
2026-05-26 NSZ2EF UME → ARN May 26, 04:45 UTCMay 26, 05:30 UTC45m
2026-05-25 NSZ13R ARN → UME May 25, 16:00 UTCMay 25, 16:35 UTC35m
2026-05-25 NSZ12U UME → ARN May 25, 14:30 UTCMay 25, 15:10 UTC40m
2026-05-25 NSZ11N ARN → UME May 25, 12:50 UTCMay 25, 13:25 UTC35m
2026-05-25 NSZ56J FCO → ARN May 25, 09:10 UTCMay 25, 12:00 UTC2h 50m
2026-05-25 NSZ5NE ARN → FCO May 25, 05:05 UTCMay 25, 07:45 UTC2h 40m
2026-05-24 NSZ4MF BCN → ARN May 24, 18:40 UTCMay 24, 21:50 UTC3h 10m
2026-05-24 NSZ3MB ARN → BCN May 24, 14:20 UTCMay 24, 17:15 UTC2h 55m
2026-05-24 NSZ4312 CDG → ARN May 24, 10:50 UTCMay 24, 13:00 UTC2h 10m
2026-05-24 NSZ3KB ARN → CDG May 24, 07:25 UTCMay 24, 09:40 UTC2h 15m
2026-05-23 NSZ6MJ FAO → ARN May 23, 17:50 UTCMay 23, 21:55 UTC4h 5m
2026-05-23 NSZ75Z ARN → FAO May 23, 12:35 UTCMay 23, 16:50 UTC4h 15m
2026-05-23 NSZ8561 ARN → LLA May 23, 08:35 UTCMay 23, 09:50 UTC1h 15m
2026-05-23 NSZ8560 LGW → LGW May 23, 06:25 UTCMay 23, 07:35 UTC1h 10m
2026-05-23 NSZ1TD LGW → OSL May 23, 04:40 UTCMay 23, 05:35 UTC55m
2026-05-22 NSZ3613 OPO → CPH May 22, 19:00 UTCMay 22, 21:55 UTC2h 55m
2026-05-22 NSZ2EM CPH → CPH May 22, 14:45 UTCMay 22, 18:00 UTC3h 15m
2026-05-22 NSZ3563 KRK → CPH May 22, 12:20 UTCMay 22, 13:30 UTC1h 10m
2026-05-22 NSZ3807 ARN → KRK May 22, 09:55 UTCMay 22, 11:35 UTC1h 40m
2026-05-22 NSZ3806 KRK → ARN May 22, 07:20 UTCMay 22, 08:55 UTC1h 35m
2026-05-22 NSZ3562 CPH → KRK May 22, 04:55 UTCMay 22, 06:00 UTC1h 5m
2026-05-21 NSZ9GY CDG → CPH May 21, 19:55 UTCMay 21, 21:20 UTC1h 25m
2026-05-21 NSZ8FI CPH → CDG May 21, 17:10 UTCMay 21, 18:45 UTC1h 35m
2026-05-21 NSZ3303 BER → CPH May 21, 15:35 UTCMay 21, 16:20 UTC45m
2026-05-21 NSZ3302 CPH → BER May 21, 13:55 UTCMay 21, 14:35 UTC40m
2026-05-21 NSZ3751 BGY → CPH May 21, 11:15 UTCMay 21, 13:05 UTC1h 50m
2026-05-21 NSZ3750 CPH → BGY May 21, 08:20 UTCMay 21, 09:55 UTC1h 35m

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

Mode-S 4ACA15 frequently asked

What is Mode-S code 4ACA15?
4ACA15 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RPU.
Where is Mode-S 4ACA15 registered?
Mode-S code 4ACA15 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA15 broadcasting right now?
Yes. Mode-S 4ACA15 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA15, octal 22545025, decimal 4,901,397.
What flights does 4ACA15 operate?
Mode-S 4ACA15 has broadcast 20 distinct callsigns, including NSZ5GT, NSZ6FY, NSZ5611, NSZ5610, NSZ5619.