Apparatus

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sensors Mode-S transponder

4ACA45

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RRE · BOEING 737-800

Hex
4ACA45
Octal
22545105
Decimal
4,901,445
Country
SE
Tail
SE-RRE
Type
B738
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
484
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 4ACA45.

Country allocation

The ICAO 24-bit address 4ACA45 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
NSZ4KP Norwegian Air Sweden AOC 7 2026-07-26
NSZ3234 - 7 2026-07-15
NSZ8YZ - 6 2026-06-14
NSZ5372 Norwegian Air Sweden AOC 6 2026-04-16
NSZ3LE Norwegian Air Sweden AOC 6 2026-04-16
NSZ3646 Norwegian Air Sweden AOC 6 2026-07-26
NSZ3641 - 6 2026-07-16
NSZ3640 - 6 2026-07-16
NSZ3235 - 6 2026-07-15
NSZ81E Norwegian Air Sweden AOC 5 2026-07-21
NSZ56V Norwegian Air Sweden AOC 5 2026-07-21
NSZ4EV Norwegian Air Sweden AOC 5 2026-07-26
NSZ3MC Norwegian Air Sweden AOC 5 2026-07-26
NSZ3LZ Norwegian Air Sweden AOC 5 2026-04-16
NSZ365L - 5 2026-07-21
NSZ3231 - 5 2026-07-15
NSZ3230 - 5 2026-07-15
NSZ3093 Norwegian Air Sweden AOC 5 2026-06-14
NSZ2NZ Norwegian Air Sweden AOC 5 2026-07-24
NSZ8MV Norwegian Air Sweden AOC 4 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ4KP NCE → CPH Jul 26, 21:00 UTCJul 26, 21:15 UTC15m
2026-07-26 NSZ3646 CPH → NCE Jul 26, 17:35 UTCJul 26, 19:25 UTC1h 50m
2026-07-26 NSZ3MC LGW → CPH Jul 26, 12:55 UTCJul 26, 14:20 UTC1h 25m
2026-07-26 NSZ4EV CPH → LGW Jul 26, 10:05 UTCJul 26, 11:55 UTC1h 50m
2026-07-26 NSZ50TE EDI → CPH Jul 26, 07:50 UTCJul 26, 09:10 UTC1h 20m
2026-07-26 NSZ3502 CPH → EDI Jul 26, 05:20 UTCJul 26, 07:00 UTC1h 41m
2026-07-25 NSZ4WF ATH → CPH Jul 25, 19:15 UTCJul 25, 22:15 UTC3h 0m
2026-07-25 NSZ3376 CPH → ATH Jul 25, 15:05 UTCJul 25, 17:50 UTC2h 45m
2026-07-24 NSZ3097 AAL → CPH Jul 24, 18:30 UTCJul 24, 18:55 UTC25m
2026-07-24 NSZ2NZ CPH → AAL Jul 24, 17:20 UTCJul 24, 17:50 UTC30m
2026-07-24 NSZ3631 BSL → CPH Jul 24, 15:05 UTCJul 24, 16:35 UTC1h 30m
2026-07-24 NSZ3630 CPH → BSL Jul 24, 12:40 UTCJul 24, 14:05 UTC1h 25m
2026-07-24 NSZ3627 TLS → CPH Jul 24, 09:25 UTCJul 24, 11:40 UTC2h 15m
2026-07-24 NSZ3626 CPH → TLS Jul 24, 05:55 UTCJul 24, 08:05 UTC2h 10m
2026-07-23 NSZ3301 BER → CPH Jul 23, 20:10 UTCJul 23, 20:55 UTC45m
2026-07-23 NSZ3300 CPH → BER Jul 23, 18:50 UTCJul 23, 19:25 UTC35m
2026-07-23 NSZ541B AMS → CPH Jul 23, 16:55 UTCJul 23, 17:55 UTC1h 0m
2026-07-23 NSZ54CA CPH → AMS Jul 23, 14:45 UTCJul 23, 15:40 UTC55m
2026-07-23 NSZ7MW MUC → CPH Jul 23, 12:25 UTCJul 23, 13:45 UTC1h 20m
2026-07-23 NSZ3306 CPH → MUC Jul 23, 10:05 UTCJul 23, 11:20 UTC1h 15m
2026-07-23 NSZ5KA BUD → CPH Jul 23, 07:35 UTCJul 23, 09:00 UTC1h 25m
2026-07-23 NSZ3FZ CPH → BUD Jul 23, 05:10 UTCJul 23, 06:40 UTC1h 30m
2026-07-22 NSZ21FC FAO → CPH Jul 22, 18:45 UTCJul 22, 22:05 UTC3h 20m
2026-07-22 NSZ2TC CPH → FAO Jul 22, 14:05 UTCJul 22, 17:30 UTC3h 25m
2026-07-22 NSZ1KS AGP → CPH Jul 22, 11:20 UTCJul 22, 13:00 UTC1h 40m
2026-07-22 NSZ6PY CPH → AGP Jul 22, 05:15 UTCJul 22, 05:25 UTC10m
2026-07-21 NSZ3299 SJJ → CPH Jul 21, 20:10 UTCJul 21, 22:10 UTC2h 0m
2026-07-21 NSZ3298 CPH → SJJ Jul 21, 17:15 UTCJul 21, 18:55 UTC1h 40m
2026-07-21 NSZ3095 AAL → CPH Jul 21, 15:40 UTCJul 21, 16:05 UTC25m
2026-07-21 NSZ3086 CPH → AAL Jul 21, 14:30 UTCJul 21, 15:00 UTC30m
2026-07-21 NSZ365L BCN → CPH Jul 21, 11:10 UTCJul 21, 13:35 UTC2h 25m
2026-07-21 NSZ56V CPH → BCN Jul 21, 07:10 UTCJul 21, 09:35 UTC2h 25m
2026-07-21 NSZ81E AAL → CPH Jul 21, 05:20 UTCJul 21, 05:50 UTC30m
2026-07-20 NSZ3929 NCE → AAL Jul 20, 18:45 UTCJul 20, 20:55 UTC2h 10m
2026-07-20 NSZ3928 AAL → NCE Jul 20, 15:30 UTCJul 20, 17:40 UTC2h 10m
2026-07-20 NSZ3086 - Jul 20, 13:55 UTCJul 20, 14:25 UTC30m
2026-07-20 NSZ6EZ VLC → CPH Jul 20, 10:25 UTCJul 20, 13:05 UTC2h 40m
2026-07-20 NSZ3654 CPH → VLC Jul 20, 05:40 UTCJul 20, 08:25 UTC2h 45m
2026-07-19 NSZ4KP NCE → CPH Jul 19, 20:30 UTCJul 19, 22:25 UTC1h 55m
2026-07-19 NSZ3646 CPH → NCE Jul 19, 17:00 UTCJul 19, 19:05 UTC2h 5m
2026-07-19 NSZ3527 MAN → CPH Jul 19, 14:35 UTCJul 19, 16:00 UTC1h 25m
2026-07-19 NSZ5GL CPH → MAN Jul 19, 11:55 UTCJul 19, 13:25 UTC1h 30m
2026-07-19 NSZ3643 NCE → CPH Jul 19, 08:45 UTCJul 19, 10:40 UTC1h 55m
2026-07-19 NSZ64NY CPH → NCE Jul 19, 05:35 UTCJul 19, 07:35 UTC2h 0m
2026-07-18 NSZ3367 HER → CPH Jul 18, 19:10 UTCJul 18, 22:20 UTC3h 10m
2026-07-18 NSZ3366 CPH → HER Jul 18, 14:45 UTCJul 18, 17:35 UTC2h 50m
2026-07-18 NSZ3089 AAL → CPH Jul 18, 13:00 UTCJul 18, 13:30 UTC30m
2026-07-18 NSZ3084 CPH → AAL Jul 18, 11:50 UTCJul 18, 12:20 UTC30m
2026-07-18 NSZ3539 - Jul 18, 09:55 UTCJul 18, 10:50 UTC55m
2026-07-18 NSZ3538 CPH → AMS Jul 18, 07:40 UTCJul 18, 08:45 UTC1h 5m

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

Mode-S 4ACA45 frequently asked

What is Mode-S code 4ACA45?
4ACA45 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RRE.
Where is Mode-S 4ACA45 registered?
Mode-S code 4ACA45 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA45 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA45, octal 22545105, decimal 4,901,445.
What flights does 4ACA45 operate?
Mode-S 4ACA45 has broadcast 20 distinct callsigns, including NSZ4KP, NSZ3234, NSZ8YZ, NSZ5372, NSZ3LE.