Apparatus

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sensors Mode-S transponder

4ACA53

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RRS · BOEING 737-800

Hex
4ACA53
Octal
22545123
Decimal
4,901,459
Country
SE
Tail
SE-RRS
Type
B738
No current signal · last broadcast Jul 10, 15:40 UTC
Flights observed
414
Distinct callsigns
20
Country
SE
Last broadcast
Jul 10, 15:40 UTC

Last known position

Most recent position reported by Mode-S 4ACA53.

Country allocation

The ICAO 24-bit address 4ACA53 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
NSZ2030 Norwegian Air Sweden AOC 10 2026-05-03
NSZ2031 Norwegian Air Sweden AOC 9 2026-04-30
NSZ2090 Norwegian Air Sweden AOC 8 2026-05-02
NSZ2091 Norwegian Air Sweden AOC 7 2026-05-02
NSZ2047 Norwegian Air Sweden AOC 7 2026-04-30
NSZ2046 Norwegian Air Sweden AOC 7 2026-04-30
NSZ2023 Norwegian Air Sweden AOC 7 2026-05-02
NSZ2022 Norwegian Air Sweden AOC 7 2026-05-02
NSZ2003 Norwegian Air Sweden AOC 7 2026-05-01
NSZ2025 - 6 2026-05-02
NSZ2024 Norwegian Air Sweden AOC 6 2026-05-02
NSZ2010 Norwegian Air Sweden AOC 6 2026-05-01
NSZ2004 Norwegian Air Sweden AOC 6 2026-04-29
NSZ87C Norwegian Air Sweden AOC 5 2026-06-12
NSZ6LA Norwegian Air Sweden AOC 5 2026-06-13
NSZ60X Norwegian Air Sweden AOC 5 2026-06-11
NSZ5WU - 5 2026-06-13
NSZ59T Norwegian Air Sweden AOC 5 2026-06-11
NSZ44L - 5 2026-06-19
NSZ43E - 5 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 NOZ817 ARN → OSL Jul 10, 14:55 UTCJul 10, 15:35 UTC40m
2026-07-10 NOZ816 - Jul 10, 13:25 UTCJul 10, 14:10 UTC45m
2026-07-03 NSZ8924 RHO → OSL Jul 3, 20:15 UTCJul 4, 00:25 UTC4h 10m
2026-06-24 NSZ4382 RHO → RHO Jun 24, 18:20 UTCJun 24, 19:04 UTC45m
2026-06-24 NSZ4381 ARN → RHO Jun 24, 13:40 UTCJun 24, 17:05 UTC3h 25m
2026-06-24 NSZ2ES LGW → ARN Jun 24, 10:10 UTCJun 24, 12:09 UTC2h 0m
2026-06-24 NSZ51M ARN → LGW Jun 24, 06:55 UTCJun 24, 09:05 UTC2h 10m
2026-06-23 NSZ4556 VNO → ARN Jun 23, 21:20 UTCJun 23, 22:29 UTC1h 10m
2026-06-23 NSZ4555 ARN → VNO Jun 23, 19:29 UTCJun 23, 20:29 UTC1h 0m
2026-06-23 NSZ5YD - Jun 23, 15:15 UTCJun 23, 18:10 UTC2h 55m
2026-06-23 NSZ4257 - Jun 23, 10:59 UTCJun 23, 13:55 UTC2h 55m
2026-06-23 NSZ4502 MUC → ARN Jun 23, 08:09 UTCJun 23, 10:04 UTC1h 55m
2026-06-23 NSZ4501 ARN → MUC Jun 23, 05:15 UTCJun 23, 07:05 UTC1h 50m
2026-06-22 NSZ2CP AGP → ARN Jun 22, 17:50 UTCJun 22, 21:49 UTC4h 0m
2026-06-22 NSZ21U - Jun 22, 12:40 UTCJun 22, 16:45 UTC4h 5m
2026-06-22 NSZ4BD DBV → ARN Jun 22, 08:04 UTCJun 22, 10:40 UTC2h 35m
2026-06-22 NSZ4331 ARN → DBV Jun 22, 04:34 UTCJun 22, 07:04 UTC2h 30m
2026-06-21 NSZ24N NCE → ARN Jun 21, 20:14 UTCJun 21, 22:49 UTC2h 35m
2026-06-21 NSZ3YL ARN → NCE Jun 21, 16:19 UTCJun 21, 19:05 UTC2h 45m
2026-06-21 NSZ4514 - Jun 21, 13:09 UTCJun 21, 14:19 UTC1h 10m
2026-06-21 NSZ4513 ARN → HAM Jun 21, 10:49 UTCJun 21, 12:10 UTC1h 20m
2026-06-21 NSZ72N PRG → ARN Jun 21, 08:04 UTCJun 21, 09:35 UTC1h 30m
2026-06-21 NSZ1VD - Jun 21, 05:35 UTCJun 21, 07:04 UTC1h 30m
2026-06-20 NSZ4402 - Jun 20, 18:10 UTCJun 20, 20:45 UTC2h 35m
2026-06-20 NSZ4401 - Jun 20, 13:04 UTCJun 20, 16:59 UTC3h 55m
2026-06-20 NSZ4328 BIA → ARN Jun 20, 09:09 UTCJun 20, 11:40 UTC2h 30m
2026-06-20 NSZ4327 ARN → BIA Jun 20, 05:19 UTCJun 20, 07:59 UTC2h 40m
2026-06-19 NSZ4406 SKG → ARN Jun 19, 21:14 UTCJun 20, 00:19 UTC3h 5m
2026-06-19 NSZ4405 ARN → SKG Jun 19, 17:29 UTCJun 19, 20:14 UTC2h 45m
2026-06-19 NSZ44L - Jun 19, 15:24 UTCJun 19, 16:19 UTC55m
2026-06-19 NSZ43E - Jun 19, 13:44 UTCJun 19, 14:39 UTC55m
2026-06-19 NSZ4336 - Jun 19, 10:29 UTCJun 19, 12:49 UTC2h 20m
2026-06-19 NSZ4335 - Jun 19, 06:35 UTCJun 19, 08:44 UTC2h 10m
2026-06-18 NSZ4556 VNO → ARN Jun 18, 19:05 UTCJun 18, 20:10 UTC1h 5m
2026-06-18 NSZ4555 ARN → VNO Jun 18, 17:10 UTCJun 18, 18:10 UTC1h 0m
2026-06-18 NSZ4502 MUC → ARN Jun 18, 14:10 UTCJun 18, 16:05 UTC1h 55m
2026-06-18 NSZ4501 ARN → MUC Jun 18, 11:10 UTCJun 18, 13:05 UTC1h 55m
2026-06-18 NSZ4EM EDI → ARN Jun 18, 08:15 UTCJun 18, 10:00 UTC1h 45m
2026-06-18 NSZ3BM ARN → EDI Jun 18, 05:15 UTCJun 18, 07:25 UTC2h 10m
2026-06-17 NSZ4382 - Jun 17, 18:35 UTCJun 17, 22:25 UTC3h 50m
2026-06-17 NSZ4381 ARN → RHO Jun 17, 14:05 UTCJun 17, 17:25 UTC3h 20m
2026-06-17 NSZ2ES LGW → ARN Jun 17, 10:30 UTCJun 17, 12:30 UTC2h 0m
2026-06-17 NSZ51M ARN → LGW Jun 17, 07:00 UTCJun 17, 09:10 UTC2h 10m
2026-06-16 NSZ44PA ATH → ARN Jun 16, 19:30 UTCJun 16, 22:45 UTC3h 16m
2026-06-16 NSZ4383 ARN → ATH Jun 16, 15:24 UTCJun 16, 18:29 UTC3h 5m
2026-06-16 NSZ6MJ FAO → ARN Jun 16, 10:25 UTCJun 16, 14:25 UTC4h 0m
2026-06-16 NSZ75Z ARN → FAO Jun 16, 05:20 UTCJun 16, 09:20 UTC4h 0m
2026-06-15 NSZ4360 - Jun 15, 18:55 UTCJun 15, 21:35 UTC2h 40m
2026-06-15 NSZ4357 ARN → FCO Jun 15, 14:50 UTCJun 15, 17:25 UTC2h 35m
2026-06-15 NSZ2ES LGW → ARN Jun 15, 10:45 UTCJun 15, 12:55 UTC2h 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-RRS page for operator, model, and routing details .

Mode-S 4ACA53 frequently asked

What is Mode-S code 4ACA53?
4ACA53 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RRS.
Where is Mode-S 4ACA53 registered?
Mode-S code 4ACA53 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA53 broadcasting right now?
No active broadcast right now. Last signal was Jul 10, 15:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA53, octal 22545123, decimal 4,901,459.
What flights does 4ACA53 operate?
Mode-S 4ACA53 has broadcast 20 distinct callsigns, including NSZ2030, NSZ2031, NSZ2090, NSZ2091, NSZ2047.