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
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
588
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S 4ACA15.

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 - 24 2026-06-25
NSZ6FY - 22 2026-06-25
NSZ5611 Norwegian Air Sweden AOC 11 2026-06-25
NSZ5610 - 9 2026-06-25
NSZ5619 - 6 2026-06-17
NSZ5618 - 6 2026-06-17
NSZ9GY Norwegian Air Sweden AOC 5 2026-07-19
NSZ9BH - 5 2026-07-17
NSZ8FI - 5 2026-07-19
NSZ5ML Norwegian Air Sweden AOC 5 2026-06-05
NSZ3641 - 5 2026-07-15
NSZ3221 Norwegian Air Sweden AOC 5 2026-06-10
NSZ3080 - 5 2026-07-17
NSZ8MV Norwegian Air Sweden AOC 4 2026-05-20
NSZ8CM Norwegian Air Sweden AOC 4 2026-04-25
NSZ7DE Norwegian Air Sweden AOC 4 2026-07-25
NSZ5TP Norwegian Air Sweden AOC 4 2026-07-24
NSZ56V - 4 2026-07-13
NSZ54CA - 4 2026-07-12
NSZ541B - 4 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ3667 PMI → CPH Jul 26, 19:25 UTCJul 26, 21:15 UTC1h 50m
2026-07-26 NSZ74Q CPH → PMI Jul 26, 15:35 UTCJul 26, 18:10 UTC2h 35m
2026-07-26 NSZ3731 FCO → CPH Jul 26, 10:05 UTCJul 26, 12:10 UTC2h 5m
2026-07-26 NSZ3730 CPH → FCO Jul 26, 04:45 UTCJul 26, 06:50 UTC2h 6m
2026-07-25 NSZ3407 RAK → CPH Jul 25, 23:40 UTCJul 26, 03:30 UTC3h 50m
2026-07-25 NSZ3406 CPH → RAK Jul 25, 18:10 UTCJul 25, 22:15 UTC4h 5m
2026-07-25 NSZ7DE CTA → CPH Jul 25, 14:10 UTCJul 25, 16:55 UTC2h 45m
2026-07-25 NSZ4VC CPH → CTA Jul 25, 10:10 UTCJul 25, 12:45 UTC2h 35m
2026-07-25 NSZ3297 ZAD → CPH Jul 25, 07:15 UTCJul 25, 09:00 UTC1h 45m
2026-07-25 NSZ3296 CPH → ZAD Jul 25, 04:35 UTCJul 25, 06:05 UTC1h 30m
2026-07-24 NSZ4KP NCE → CPH Jul 24, 20:05 UTCJul 24, 22:05 UTC2h 0m
2026-07-24 NSZ3646 CPH → NCE Jul 24, 17:05 UTCJul 24, 19:05 UTC2h 0m
2026-07-24 NSZ50TE - Jul 24, 14:45 UTCJul 24, 16:15 UTC1h 30m
2026-07-24 NSZ3502 CPH → EDI Jul 24, 12:05 UTCJul 24, 13:40 UTC1h 35m
2026-07-24 NSZ5TP LGW → CPH Jul 24, 09:25 UTCJul 24, 10:45 UTC1h 20m
2026-07-24 NSZ3510 CPH → LGW Jul 24, 06:10 UTCJul 24, 07:50 UTC1h 40m
2026-07-23 NSZ3733 FCO → CPH Jul 23, 19:40 UTCJul 23, 21:50 UTC2h 10m
2026-07-23 NSZ3732 CPH → FCO Jul 23, 16:30 UTCJul 23, 18:20 UTC1h 50m
2026-07-23 NSZ3229 OSL → CPH Jul 23, 14:45 UTCJul 23, 15:30 UTC45m
2026-07-23 NSZ3228 CPH → OSL Jul 23, 12:55 UTCJul 23, 14:00 UTC1h 5m
2026-07-23 NSZ3661 ALC → CPH Jul 23, 08:20 UTCJul 23, 11:25 UTC3h 5m
2026-07-23 NSZ3660 CPH → ALC Jul 23, 04:20 UTCJul 23, 07:10 UTC2h 50m
2026-07-22 NSZ3799 TBS → CPH Jul 22, 20:05 UTCJul 23, 00:25 UTC4h 20m
2026-07-22 NSZ3798 CPH → TBS Jul 22, 15:05 UTCJul 22, 17:35 UTC2h 30m
2026-07-22 NSZ3777 CLJ → CPH Jul 22, 11:50 UTCJul 22, 13:40 UTC1h 50m
2026-07-22 NSZ8ML CPH → PRG Jul 22, 05:20 UTCJul 22, 05:25 UTC5m
2026-07-21 NSZ73N EDI → CPH Jul 21, 20:15 UTCJul 21, 21:45 UTC1h 30m
2026-07-21 NSZ3504 CPH → EDI Jul 21, 17:50 UTCJul 21, 19:25 UTC1h 35m
2026-07-21 NSZ3743 - Jul 21, 14:30 UTCJul 21, 16:50 UTC2h 20m
2026-07-21 NSZ3742 CPH → OLB Jul 21, 11:10 UTCJul 21, 13:30 UTC2h 20m
2026-07-21 NSZ3289 - Jul 21, 08:05 UTCJul 21, 09:55 UTC1h 50m
2026-07-21 NSZ3288 - Jul 21, 05:05 UTCJul 21, 06:45 UTC1h 40m
2026-07-20 NSZ3521 LGW → CPH Jul 20, 20:00 UTCJul 20, 21:25 UTC1h 25m
2026-07-20 NSZ3534 - Jul 20, 17:25 UTCJul 20, 18:45 UTC1h 20m
2026-07-20 NSZ3535 - Jul 20, 15:15 UTCJul 20, 16:25 UTC1h 10m
2026-07-20 NSZ3516 CPH → LGW Jul 20, 12:15 UTCJul 20, 13:55 UTC1h 40m
2026-07-20 NSZ7DE - Jul 20, 08:20 UTCJul 20, 10:55 UTC2h 35m
2026-07-20 NSZ4VC - Jul 20, 04:15 UTCJul 20, 07:05 UTC2h 50m
2026-07-19 NSZ9GY CDG → CPH Jul 19, 20:15 UTCJul 19, 21:45 UTC1h 30m
2026-07-19 NSZ8FI - Jul 19, 17:30 UTCJul 19, 19:00 UTC1h 30m
2026-07-19 NSZ3227 OSL → CPH Jul 19, 15:50 UTCJul 19, 16:35 UTC45m
2026-07-19 NSZ3226 CPH → OSL Jul 19, 14:05 UTCJul 19, 14:55 UTC50m
2026-07-19 NSZ1KS AGP → CPH Jul 19, 10:10 UTCJul 19, 13:10 UTC3h 0m
2026-07-19 NSZ6PY CPH → AGP Jul 19, 05:35 UTCJul 19, 09:05 UTC3h 30m
2026-07-18 NSZ3407 - Jul 18, 23:35 UTCJul 19, 03:15 UTC3h 40m
2026-07-18 NSZ3406 - Jul 18, 18:05 UTCJul 18, 22:20 UTC4h 15m
2026-07-18 NSZ7DE - Jul 18, 14:15 UTCJul 18, 16:50 UTC2h 35m
2026-07-18 NSZ4VC - Jul 18, 10:20 UTCJul 18, 12:55 UTC2h 35m
2026-07-18 NSZ3297 ZAD → CPH Jul 18, 07:15 UTCJul 18, 09:00 UTC1h 45m
2026-07-18 NSZ3296 CPH → ZAD Jul 18, 04:25 UTCJul 18, 06:05 UTC1h 40m

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?
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 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.