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 Jul 26, 21:45 UTC
Flights observed
541
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 21:45 UTC

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
NSZ2046 - 9 2026-07-16
NSZ6LA - 8 2026-07-20
NSZ5WU Norwegian Air Sweden AOC 8 2026-07-20
NSZ2047 - 8 2026-07-16
NSZ2031 - 8 2026-07-16
NSZ2030 - 8 2026-07-18
NSZ60X Norwegian Air Sweden AOC 7 2026-07-20
NSZ59T Norwegian Air Sweden AOC 7 2026-07-20
NSZ35A - 7 2026-07-19
NSZ2MP Norwegian Air Sweden AOC 7 2026-07-25
NSZ13R Norwegian Air Sweden AOC 7 2026-07-23
NSZ8GH - 6 2026-07-05
NSZ46M - 6 2026-07-19
NSZ45F Norwegian Air Sweden AOC 6 2026-05-06
NSZ3YT Norwegian Air Sweden AOC 6 2026-07-25
NSZ3LW Norwegian Air Sweden AOC 6 2026-05-07
NSZ38K Norwegian Air Sweden AOC 6 2026-05-07
NSZ2063 - 6 2026-07-17
NSZ44L - 5 2026-07-19
NSZ21U Norwegian Air Sweden AOC 5 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ8KY FCO → ARN Jul 26, 19:00 UTCJul 26, 21:45 UTC2h 45m
2026-07-26 NSZ4357 ARN → FCO Jul 26, 15:00 UTCJul 26, 17:40 UTC2h 40m
2026-07-26 NSZ2CP AGP → ARN Jul 26, 10:05 UTCJul 26, 14:00 UTC3h 55m
2026-07-26 NSZ21U ARN → AGP Jul 26, 04:40 UTCJul 26, 08:35 UTC3h 56m
2026-07-25 NSZ4280 OPO → ARN Jul 25, 18:10 UTCJul 25, 21:55 UTC3h 45m
2026-07-25 NSZ4279 ARN → OPO Jul 25, 13:25 UTCJul 25, 17:00 UTC3h 35m
2026-07-25 NSZ2MP NCE → ARN Jul 25, 09:45 UTCJul 25, 12:30 UTC2h 45m
2026-07-25 NSZ3YT ARN → NCE Jul 25, 06:00 UTCJul 25, 08:40 UTC2h 40m
2026-07-24 NSZ24N NCE → ARN Jul 24, 19:55 UTCJul 24, 22:40 UTC2h 45m
2026-07-24 NSZ3YL ARN → NCE Jul 24, 16:20 UTCJul 24, 18:50 UTC2h 30m
2026-07-24 NSZ4092 VBY → ARN Jul 24, 14:45 UTCJul 24, 15:15 UTC30m
2026-07-24 NSZ4091 ARN → VBY Jul 24, 13:40 UTCJul 24, 14:00 UTC20m
2026-07-24 NSZ56J FCO → ARN Jul 24, 09:40 UTCJul 24, 12:40 UTC3h 0m
2026-07-24 NSZ5NE ARN → FCO Jul 24, 05:05 UTCJul 24, 07:25 UTC2h 20m
2026-07-23 NSZ4354 AMS → ARN Jul 23, 19:50 UTCJul 23, 21:35 UTC1h 45m
2026-07-23 NSZ4353 ARN → AMS Jul 23, 16:55 UTCJul 23, 18:30 UTC1h 35m
2026-07-23 NSZ14V UME → ARN Jul 23, 15:15 UTCJul 23, 15:55 UTC40m
2026-07-23 NSZ13R ARN → UME Jul 23, 13:40 UTCJul 23, 14:20 UTC40m
2026-07-23 NSZ2ES LGW → ARN Jul 23, 10:05 UTCJul 23, 12:25 UTC2h 20m
2026-07-23 NSZ51M ARN → LGW Jul 23, 06:50 UTCJul 23, 08:50 UTC2h 0m
2026-07-22 NSZ72FK CTA → ARN Jul 22, 18:10 UTCJul 22, 21:30 UTC3h 20m
2026-07-22 NSZ4371 ARN → CTA Jul 22, 13:50 UTCJul 22, 17:00 UTC3h 10m
2026-07-22 NSZ4364 PMO → ARN Jul 22, 04:50 UTCJul 22, 12:40 UTC7h 50m
2026-07-22 NSZ4562 BOJ → ARN Jul 22, 00:30 UTCJul 22, 01:45 UTC1h 15m
2026-07-21 NSZ4562 BOJ → ARN Jul 21, 22:55 UTCJul 22, 00:25 UTC1h 30m
2026-07-21 NSZ4561 ARN → BOJ Jul 21, 19:20 UTCJul 21, 21:55 UTC2h 35m
2026-07-21 NSZ4370 PSA → ARN Jul 21, 15:40 UTCJul 21, 18:10 UTC2h 30m
2026-07-21 NSZ4369 ARN → PSA Jul 21, 11:55 UTCJul 21, 14:30 UTC2h 35m
2026-07-21 NSZ4366 VCE → ARN Jul 21, 08:20 UTCJul 21, 10:35 UTC2h 15m
2026-07-21 NSZ4365 ARN → VCE Jul 21, 05:40 UTCJul 21, 07:20 UTC1h 40m
2026-07-21 NSZ4365 ARN → VCE Jul 21, 05:05 UTCJul 21, 05:35 UTC30m
2026-07-20 NSZ60X LGW → ARN Jul 20, 19:20 UTCJul 20, 21:35 UTC2h 15m
2026-07-20 NSZ59T ARN → LGW Jul 20, 16:10 UTCJul 20, 18:15 UTC2h 5m
2026-07-20 NSZ6LA LGW → ARN Jul 20, 12:50 UTCJul 20, 14:55 UTC2h 5m
2026-07-20 NSZ5WU ARN → LGW Jul 20, 09:00 UTCJul 20, 11:10 UTC2h 10m
2026-07-20 NSZ4004 - Jul 20, 07:10 UTCJul 20, 07:55 UTC45m
2026-07-20 NSZ9UA ARN → UME Jul 20, 05:30 UTCJul 20, 06:00 UTC30m
2026-07-19 NSZ46M - Jul 19, 20:35 UTCJul 19, 21:40 UTC1h 5m
2026-07-19 NSZ7DP - Jul 19, 18:50 UTCJul 19, 19:45 UTC55m
2026-07-19 NSZ44L - Jul 19, 16:40 UTCJul 19, 17:45 UTC1h 5m
2026-07-19 NSZ43E - Jul 19, 14:45 UTCJul 19, 15:35 UTC50m
2026-07-19 NSZ4064 KRN → ARN Jul 19, 12:25 UTCJul 19, 13:45 UTC1h 20m
2026-07-19 NSZ4063 ARN → KRN Jul 19, 10:10 UTCJul 19, 11:15 UTC1h 5m
2026-07-19 NSZ4063 ARN → KRN Jul 19, 09:55 UTCJul 19, 10:00 UTC5m
2026-07-19 NSZ36J LLA → ARN Jul 19, 08:10 UTCJul 19, 09:15 UTC1h 5m
2026-07-19 NSZ35A - Jul 19, 06:15 UTCJul 19, 07:10 UTC55m
2026-07-18 NSZ4528 - Jul 18, 19:55 UTCJul 19, 00:20 UTC4h 25m
2026-07-18 NSZ4527 - Jul 18, 13:50 UTCJul 18, 18:45 UTC4h 55m
2026-07-18 NSZ2057 SJJ → ARN Jul 18, 09:35 UTCJul 18, 11:45 UTC2h 10m
2026-07-18 NSZ2056 ARN → SJJ Jul 18, 06:00 UTCJul 18, 08:30 UTC2h 30m

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 Jul 26, 21:45 UTC.
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 NSZ2046, NSZ6LA, NSZ5WU, NSZ2047, NSZ2031.