Apparatus

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sensors Mode-S transponder

4ACA12

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RPR · BOEING 737-800

Hex
4ACA12
Octal
22545022
Decimal
4,901,394
Country
SE
Tail
SE-RPR
Type
B738
Broadcasting now · callsign NSZ5PF · 37,000 ft
Flights observed
568
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 22:10 UTC

Current position

4ACA12 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA12 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
NSZ8YZ - 8 2026-07-15
NSZ5YR Norwegian Air Sweden AOC 8 2026-05-20
NSZ5352 Norwegian Air Sweden AOC 8 2026-07-26
NSZ3LZ Norwegian Air Sweden AOC 8 2026-05-22
NSZ3LE Norwegian Air Sweden AOC 8 2026-05-22
NSZ365L - 8 2026-07-20
NSZ3093 - 8 2026-07-15
NSZ2031 Norwegian Air Sweden AOC 8 2026-06-11
NSZ1LY Norwegian Air Sweden AOC 8 2026-05-20
NSZ9GY Norwegian Air Sweden AOC 7 2026-07-20
NSZ8FI Norwegian Air Sweden AOC 7 2026-07-20
NSZ5HA Norwegian Air Sweden AOC 7 2026-07-25
NSZ56V Norwegian Air Sweden AOC 7 2026-07-20
NSZ3303 - 7 2026-07-20
NSZ3302 - 7 2026-07-20
NSZ3231 - 7 2026-06-27
NSZ2030 Norwegian Air Sweden AOC 7 2026-06-11
NSZ5372 Norwegian Air Sweden AOC 6 2026-05-22
NSZ9BH - 5 2026-07-13
NSZ81E Norwegian Air Sweden AOC 5 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ9MC ARN → ALC Jul 26, 18:40 UTCJul 26, 22:10 UTC3h 30m
2026-07-26 NSZ5352 ALC → ARN Jul 26, 14:05 UTCJul 26, 17:45 UTC3h 40m
2026-07-26 NSZ5321 OSL → ALC Jul 26, 09:40 UTCJul 26, 12:55 UTC3h 15m
2026-07-26 NSZ5320 ALC → OSL Jul 26, 05:15 UTCJul 26, 08:35 UTC3h 21m
2026-07-25 NSZ5HA ARN → ALC Jul 25, 17:55 UTCJul 25, 21:35 UTC3h 40m
2026-07-25 NSZ5352 ALC → ARN Jul 25, 13:40 UTCJul 25, 17:05 UTC3h 25m
2026-07-25 NSZ5379 AAL → ALC Jul 25, 09:20 UTCJul 25, 12:20 UTC3h 0m
2026-07-25 NSZ5378 ALC → AAL Jul 25, 05:35 UTCJul 25, 08:30 UTC2h 55m
2026-07-24 NSZ5HA ARN → ALC Jul 24, 18:05 UTCJul 24, 21:45 UTC3h 40m
2026-07-24 NSZ5352 ALC → ARN Jul 24, 13:15 UTCJul 24, 16:50 UTC3h 35m
2026-07-24 NSZ37F CPH → ALC Jul 24, 09:10 UTCJul 24, 12:10 UTC3h 0m
2026-07-24 NSZ37A ALC → CPH Jul 24, 05:15 UTCJul 24, 08:10 UTC2h 55m
2026-07-23 NSZ9LW TRD → ALC Jul 23, 17:55 UTCJul 23, 21:35 UTC3h 40m
2026-07-23 NSZ8BM ALC → TRD Jul 23, 13:10 UTCJul 23, 17:00 UTC3h 50m
2026-07-23 NSZ8WY BGO → ALC Jul 23, 08:50 UTCJul 23, 11:55 UTC3h 5m
2026-07-23 NSZ5PF ALC → BGO Jul 23, 04:30 UTCJul 23, 07:55 UTC3h 25m
2026-07-22 NSZ5HA ARN → ALC Jul 22, 18:25 UTCJul 22, 22:05 UTC3h 40m
2026-07-22 NSZ3803 UME → ARN Jul 22, 16:45 UTCJul 22, 17:25 UTC40m
2026-07-22 NSZ3802 ARN → UME Jul 22, 15:10 UTCJul 22, 15:45 UTC35m
2026-07-22 NSZ3206 - Jul 22, 13:10 UTCJul 22, 14:05 UTC55m
2026-07-22 NSZ3531 MLA → CPH Jul 22, 10:20 UTCJul 22, 12:15 UTC1h 55m
2026-07-21 NSZ50TE - Jul 21, 14:20 UTCJul 21, 15:50 UTC1h 30m
2026-07-21 NSZ3502 CPH → EDI Jul 21, 11:55 UTCJul 21, 13:25 UTC1h 30m
2026-07-21 NSZ5TP LGW → CPH Jul 21, 09:20 UTCJul 21, 10:45 UTC1h 25m
2026-07-21 NSZ3510 CPH → LGW Jul 21, 06:10 UTCJul 21, 07:55 UTC1h 45m
2026-07-20 NSZ9GY CDG → CPH Jul 20, 20:55 UTCJul 20, 22:20 UTC1h 25m
2026-07-20 NSZ8FI CPH → CDG Jul 20, 18:25 UTCJul 20, 19:55 UTC1h 30m
2026-07-20 NSZ3303 BER → CPH Jul 20, 16:50 UTCJul 20, 17:30 UTC40m
2026-07-20 NSZ3302 CPH → BER Jul 20, 15:10 UTCJul 20, 15:45 UTC35m
2026-07-20 NSZ365L BCN → CPH Jul 20, 11:25 UTCJul 20, 13:50 UTC2h 25m
2026-07-20 NSZ56V CPH → BCN Jul 20, 07:15 UTCJul 20, 09:45 UTC2h 30m
2026-07-20 NSZ81E AAL → CPH Jul 20, 05:20 UTCJul 20, 05:50 UTC30m
2026-07-19 NSZ6MP CPH → AAL Jul 19, 19:05 UTCJul 19, 19:35 UTC30m
2026-07-19 NSZ541B AMS → CPH Jul 19, 17:20 UTCJul 19, 18:20 UTC1h 0m
2026-07-19 NSZ54CA CPH → AMS Jul 19, 14:55 UTCJul 19, 16:00 UTC1h 5m
2026-07-19 NSZ3631 BSL → CPH Jul 19, 12:20 UTCJul 19, 13:45 UTC1h 25m
2026-07-19 NSZ3630 CPH → BSL Jul 19, 09:55 UTCJul 19, 11:20 UTC1h 25m
2026-07-19 NSZ3777 CLJ → CPH Jul 19, 07:10 UTCJul 19, 08:45 UTC1h 35m
2026-07-19 NSZ3776 CPH → CLJ Jul 19, 04:25 UTCJul 19, 06:05 UTC1h 40m
2026-07-18 NSZ3783 BOJ → CPH Jul 18, 20:20 UTCJul 18, 21:15 UTC55m
2026-07-18 NSZ3782 CPH → BOJ Jul 18, 17:00 UTCJul 18, 19:15 UTC2h 15m
2026-07-18 NSZ3755 LJU → CPH Jul 18, 14:35 UTCJul 18, 16:00 UTC1h 25m
2026-07-18 NSZ3754 CPH → LJU Jul 18, 12:00 UTCJul 18, 13:25 UTC1h 25m
2026-07-18 NSZ5TP LGW → CPH Jul 18, 09:10 UTCJul 18, 10:30 UTC1h 20m
2026-07-18 NSZ3510 CPH → LGW Jul 18, 06:05 UTCJul 18, 07:50 UTC1h 45m
2026-07-17 NSZ3631 - Jul 17, 17:50 UTCJul 17, 19:09 UTC1h 20m
2026-07-17 NSZ3630 CPH → BSL Jul 17, 12:30 UTCJul 17, 14:24 UTC1h 55m
2026-07-17 NSZ3627 TLS → CPH Jul 17, 09:30 UTCJul 17, 11:35 UTC2h 5m
2026-07-17 NSZ3626 CPH → TLS Jul 17, 06:15 UTCJul 17, 08:30 UTC2h 15m
2026-07-16 NSZ9GY - Jul 16, 20:25 UTCJul 16, 21:45 UTC1h 20m

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

Mode-S 4ACA12 frequently asked

What is Mode-S code 4ACA12?
4ACA12 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RPR.
Where is Mode-S 4ACA12 registered?
Mode-S code 4ACA12 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA12 broadcasting right now?
Yes. Mode-S 4ACA12 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA12, octal 22545022, decimal 4,901,394.
What flights does 4ACA12 operate?
Mode-S 4ACA12 has broadcast 20 distinct callsigns, including NSZ8YZ, NSZ5YR, NSZ5352, NSZ3LZ, NSZ3LE.