Apparatus

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sensors Mode-S transponder

4ACA50

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RRP · BOEING 737-800

Hex
4ACA50
Octal
22545120
Decimal
4,901,456
Country
SE
Tail
SE-RRP
Type
B738
No current signal · last broadcast 1d ago
Flights observed
245
Distinct callsigns
20
Country
SE
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 4ACA50.

Country allocation

The ICAO 24-bit address 4ACA50 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
NSZ45F Norwegian Air Sweden AOC 6 2026-05-06
NSZ3LW Norwegian Air Sweden AOC 6 2026-05-07
NSZ38K Norwegian Air Sweden AOC 6 2026-05-07
NSZ35A Norwegian Air Sweden AOC 6 2026-05-07
NSZ2MP Norwegian Air Sweden AOC 6 2026-05-06
NSZ13R Norwegian Air Sweden AOC 6 2026-05-01
NSZ8GH Norwegian Air Sweden AOC 5 2026-05-02
NSZ6LA Norwegian Air Sweden AOC 5 2026-05-14
NSZ60X Norwegian Air Sweden AOC 5 2026-05-14
NSZ5WU Norwegian Air Sweden AOC 5 2026-05-14
NSZ59T Norwegian Air Sweden AOC 5 2026-05-14
NSZ46M Norwegian Air Sweden AOC 5 2026-05-06
NSZ3YT Norwegian Air Sweden AOC 5 2026-05-06
NSZ1KM Norwegian Air Sweden AOC 5 2026-05-21
NSZ12U Norwegian Air Sweden AOC 5 2026-05-01
NSZ11N Norwegian Air Sweden AOC 5 2026-05-01
NSZ44L Norwegian Air Sweden AOC 4 2026-05-06
NSZ16Z Norwegian Air Sweden AOC 4 2026-04-30
NSZ96Y Norwegian Air Sweden AOC 3 2026-04-30
NSZ5YB Norwegian Air Sweden AOC 3 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 NSZ2063 CPH → RIX May 28, 19:30 UTCMay 28, 20:40 UTC1h 10m
2026-05-28 NSZ2067 PRG → CPH May 28, 17:30 UTCMay 28, 18:30 UTC1h 0m
2026-05-28 NSZ2066 CPH → PRG May 28, 15:40 UTCMay 28, 16:35 UTC55m
2026-05-28 NSZ2062 RIX → CPH May 28, 13:45 UTCMay 28, 14:50 UTC1h 5m
2026-05-28 NSZ2003 OSL → RIX May 28, 11:25 UTCMay 28, 12:35 UTC1h 10m
2026-05-28 NSZ2013 PLQ → OSL May 28, 09:20 UTCMay 28, 10:35 UTC1h 15m
2026-05-28 NSZ2012 OSL → PLQ May 28, 07:30 UTCMay 28, 08:35 UTC1h 5m
2026-05-28 NSZ2002 RIX → OSL May 28, 05:15 UTCMay 28, 06:35 UTC1h 20m
2026-05-27 NSZ2063 CPH → RIX May 27, 19:40 UTCMay 27, 20:40 UTC1h 0m
2026-05-27 NSZ2067 PRG → CPH May 27, 17:45 UTCMay 27, 18:45 UTC1h 0m
2026-05-27 NSZ2066 CPH → PRG May 27, 15:35 UTCMay 27, 16:35 UTC1h 0m
2026-05-27 NSZ2062 RIX → CPH May 27, 13:30 UTCMay 27, 14:40 UTC1h 10m
2026-05-27 NSZ2003 OSL → RIX May 27, 11:15 UTCMay 27, 12:25 UTC1h 10m
2026-05-27 NSZ2011 TLL → OSL May 27, 09:10 UTCMay 27, 10:25 UTC1h 15m
2026-05-27 NSZ2010 OSL → TLL May 27, 07:20 UTCMay 27, 08:25 UTC1h 5m
2026-05-27 NSZ2002 RIX → OSL May 27, 05:09 UTCMay 27, 06:25 UTC1h 15m
2026-05-26 NSZ2023 BGO → RIX May 26, 18:05 UTCMay 26, 19:25 UTC1h 20m
2026-05-26 NSZ2025 PLQ → BGO May 26, 15:29 UTCMay 26, 17:15 UTC1h 45m
2026-05-26 NSZ2024 BGO → PLQ May 26, 13:34 UTCMay 26, 14:50 UTC1h 15m
2026-05-26 NSZ2022 RIX → BGO May 26, 10:44 UTCMay 26, 12:50 UTC2h 5m
2026-05-26 NSZ2091 TIV → RIX May 26, 07:24 UTCMay 26, 09:49 UTC2h 25m
2026-05-26 NSZ2090 RIX → TIV May 26, 04:15 UTCMay 26, 06:10 UTC1h 55m
2026-05-25 NSZ2005 OSL → RIX May 25, 17:40 UTCMay 25, 18:50 UTC1h 10m
2026-05-25 NSZ2004 RIX → OSL May 25, 15:35 UTCMay 25, 17:00 UTC1h 25m
2026-05-25 NSZ2031 ARN → RIX May 25, 13:40 UTCMay 25, 14:20 UTC40m
2026-05-25 NSZ2047 CDG → ARN May 25, 10:40 UTCMay 25, 12:50 UTC2h 10m
2026-05-25 NSZ2046 ARN → CDG May 25, 07:05 UTCMay 25, 09:20 UTC2h 15m
2026-05-24 NSZ24N NCE → ARN May 24, 19:10 UTCMay 24, 21:50 UTC2h 40m
2026-05-24 NSZ3YL ARN → NCE May 24, 15:30 UTCMay 24, 18:00 UTC2h 30m
2026-05-24 NSZ2CP AGP → ARN May 24, 10:30 UTCMay 24, 14:20 UTC3h 50m
2026-05-24 NSZ21U ARN → AGP May 24, 05:25 UTCMay 24, 09:15 UTC3h 50m
2026-05-23 NSZ4396 CHQ → ARN May 23, 18:45 UTCMay 23, 22:25 UTC3h 40m
2026-05-23 NSZ4395 ARN → CHQ May 23, 13:50 UTCMay 23, 17:10 UTC3h 20m
2026-05-23 NSZ4336 SPU → ARN May 23, 09:30 UTCMay 23, 11:50 UTC2h 20m
2026-05-23 NSZ4335 ARN → SPU May 23, 06:10 UTCMay 23, 08:10 UTC2h 0m
2026-05-23 NOZ2PC BER → ARN May 23, 04:45 UTCMay 23, 05:20 UTC35m
2026-05-22 NSZ8924 LGW → BCN May 22, 08:25 UTCMay 22, 09:20 UTC55m
2026-05-21 NSZ1KM ARN → UME May 21, 19:40 UTCMay 21, 20:20 UTC40m
2026-05-21 NSZ1KM ARN → UME May 21, 19:00 UTCMay 21, 19:30 UTC30m
2026-05-21 NSZ4114 OSL → ARN May 21, 18:10 UTCMay 21, 18:50 UTC40m
2026-05-21 NSZ4113 ARN → OSL May 21, 16:45 UTCMay 21, 17:30 UTC45m
2026-05-21 NSZ4110 OSL → ARN May 21, 14:55 UTCMay 21, 15:40 UTC45m
2026-05-21 NOZ4TL KRK → OSL May 21, 10:25 UTCMay 21, 12:20 UTC1h 55m
2026-05-21 NOZ4BJ OSL → KRK May 21, 07:45 UTCMay 21, 09:30 UTC1h 45m
2026-05-21 NOZ525 SVG → OSL May 21, 06:25 UTCMay 21, 07:05 UTC40m
2026-05-21 NOZ522 OSL → SVG May 21, 05:10 UTCMay 21, 05:55 UTC45m
2026-05-17 NSZ1TD LGW → OSL May 17, 22:05 UTCMay 17, 22:55 UTC50m
2026-05-17 NSZ3213 ARN → CPH May 17, 20:20 UTCMay 17, 21:15 UTC55m
2026-05-17 NSZ4508 BER → ARN May 17, 18:01 UTCMay 17, 19:15 UTC1h 15m
2026-05-17 NSZ4507 ARN → BER May 17, 15:45 UTCMay 17, 17:01 UTC1h 15m

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

Mode-S 4ACA50 frequently asked

What is Mode-S code 4ACA50?
4ACA50 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RRP.
Where is Mode-S 4ACA50 registered?
Mode-S code 4ACA50 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA50 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA50, octal 22545120, decimal 4,901,456.
What flights does 4ACA50 operate?
Mode-S 4ACA50 has broadcast 20 distinct callsigns, including NSZ45F, NSZ3LW, NSZ38K, NSZ35A, NSZ2MP.