Apparatus

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sensors Mode-S transponder

4ACB23

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RYC · BOEING 737 MAX 8

Hex
4ACB23
Octal
22545443
Decimal
4,901,667
Country
SE
Tail
SE-RYC
Type
B38M
Broadcasting now · callsign NSZ5071 · 37,000 ft
Flights observed
240
Distinct callsigns
20
Country
SE
Last broadcast
2h ago

Current position

4ACB23 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACB23 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
NSZ5070 Norwegian Air Sweden AOC 10 2026-05-30
NSZ5051 Norwegian Air Sweden AOC 10 2026-05-01
NSZ8KC Norwegian Air Sweden AOC 8 2026-05-01
NSZ5074 Norwegian Air Sweden AOC 6 2026-05-05
NSZ5071 Norwegian Air Sweden AOC 6 2026-05-05
NSZ5TP Norwegian Air Sweden AOC 5 2026-05-25
NSZ5037 Norwegian Air Sweden AOC 5 2026-04-16
NSZ5036 Norwegian Air Sweden AOC 5 2026-04-16
NSZ3KQ Norwegian Air Sweden AOC 5 2026-05-04
NSZ3510 Norwegian Air Sweden AOC 5 2026-05-25
NSZ3503 Norwegian Air Sweden AOC 5 2026-05-25
NSZ3502 Norwegian Air Sweden AOC 5 2026-05-25
NSZ8UK Norwegian Air Sweden AOC 4 2026-05-04
NSZ5023 Norwegian Air Sweden AOC 4 2026-04-26
NSZ4KP Norwegian Air Sweden AOC 4 2026-05-25
NSZ3646 Norwegian Air Sweden AOC 4 2026-05-25
NSZ9YB Norwegian Air Sweden AOC 3 2026-05-28
NSZ9BP Norwegian Air Sweden AOC 3 2026-05-29
NSZ80W Norwegian Air Sweden AOC 3 2026-04-17
NSZ7CB Norwegian Air Sweden AOC 3 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 NSZ5070 AGP → CPH May 30, 04:20 UTCMay 30, 07:35 UTC3h 15m
2026-05-29 NSZ5BF AAL → AGP May 29, 18:25 UTCMay 29, 21:45 UTC3h 20m
2026-05-29 NSZ8LP AGP → AAL May 29, 14:20 UTCMay 29, 17:35 UTC3h 15m
2026-05-29 NSZ9BP GOT → AGP May 29, 09:35 UTCMay 29, 12:50 UTC3h 15m
2026-05-29 NSZ5TQ AGP → GOT May 29, 05:05 UTCMay 29, 08:35 UTC3h 30m
2026-05-28 NSZ9YB CPH → AGP May 28, 18:55 UTCMay 28, 22:05 UTC3h 10m
2026-05-28 NSZ541B AMS → CPH May 28, 16:50 UTCMay 28, 17:45 UTC55m
2026-05-28 NSZ54CA CPH → AMS May 28, 14:45 UTCMay 28, 15:50 UTC1h 5m
2026-05-28 NSZ3641 NCE → CPH May 28, 11:45 UTCMay 28, 13:45 UTC2h 0m
2026-05-28 NSZ3640 CPH → NCE May 28, 08:45 UTCMay 28, 10:45 UTC2h 0m
2026-05-28 NSZ3195 ARN → CPH May 28, 07:00 UTCMay 28, 07:55 UTC55m
2026-05-28 NSZ3194 CPH → ARN May 28, 05:20 UTCMay 28, 06:15 UTC55m
2026-05-27 NSZ3733 FCO → CPH May 27, 19:35 UTCMay 27, 21:40 UTC2h 5m
2026-05-27 NSZ3732 CPH → FCO May 27, 16:25 UTCMay 27, 18:25 UTC2h 0m
2026-05-27 NSZ3527 MAN → CPH May 27, 13:50 UTCMay 27, 15:10 UTC1h 20m
2026-05-27 NSZ3526 CPH → MAN May 27, 11:05 UTCMay 27, 12:45 UTC1h 40m
2026-05-27 NSZ7CB DUB → CPH May 27, 08:15 UTCMay 27, 09:55 UTC1h 40m
2026-05-27 NSZ46BA CPH → DUB May 27, 05:14 UTCMay 27, 07:05 UTC1h 51m
2026-05-26 NSZ2RT ARN → CPH May 26, 17:15 UTCMay 26, 18:10 UTC55m
2026-05-26 NSZ8MV CPH → ARN May 26, 15:14 UTCMay 26, 16:10 UTC55m
2026-05-26 NSZ3583 PRG → CPH May 26, 13:04 UTCMay 26, 14:05 UTC1h 0m
2026-05-26 NSZ3582 CPH → PRG May 26, 11:05 UTCMay 26, 12:00 UTC55m
2026-05-26 NSZ3289 SPU → CPH May 26, 07:55 UTCMay 26, 09:59 UTC2h 5m
2026-05-26 NSZ3288 CPH → SPU May 26, 05:10 UTCMay 26, 06:44 UTC1h 35m
2026-05-25 NSZ4KP NCE → CPH May 25, 19:59 UTCMay 25, 22:00 UTC2h 0m
2026-05-25 NSZ3646 CPH → NCE May 25, 16:50 UTCMay 25, 18:45 UTC1h 55m
2026-05-25 NSZ3503 EDI → CPH May 25, 14:15 UTCMay 25, 15:35 UTC1h 20m
2026-05-25 NSZ3502 CPH → EDI May 25, 11:45 UTCMay 25, 13:20 UTC1h 35m
2026-05-25 NSZ5TP LGW → CPH May 25, 09:20 UTCMay 25, 10:40 UTC1h 20m
2026-05-25 NSZ3510 CPH → LGW May 25, 06:15 UTCMay 25, 08:00 UTC1h 45m
2026-05-24 NSZ7CB DUB → CPH May 24, 19:35 UTCMay 24, 21:15 UTC1h 40m
2026-05-24 NSZ46BA CPH → DUB May 24, 16:40 UTCMay 24, 18:25 UTC1h 45m
2026-05-24 NSZ5KA BUD → CPH May 24, 14:05 UTCMay 24, 15:35 UTC1h 30m
2026-05-24 NSZ55YN CPH → BUD May 24, 12:00 UTCMay 24, 13:25 UTC1h 25m
2026-05-24 NSZ3631 BSL → CPH May 24, 09:35 UTCMay 24, 11:05 UTC1h 30m
2026-05-24 NSZ3630 CPH → BSL May 24, 07:30 UTCMay 24, 08:45 UTC1h 15m
2026-05-23 NSZ3TW AGP → CPH May 23, 17:00 UTCMay 23, 20:15 UTC3h 16m
2026-05-23 NSZ2BL CPH → AGP May 23, 12:30 UTCMay 23, 15:40 UTC3h 10m
2026-05-23 NSZ5HM ALC → CPH May 23, 08:40 UTCMay 23, 11:15 UTC2h 35m
2026-05-23 NSZ64N PMI → CPH May 23, 04:25 UTCMay 23, 07:00 UTC2h 35m
2026-05-22 NSZ3733 FCO → CPH May 22, 20:10 UTCMay 22, 22:20 UTC2h 10m
2026-05-22 NSZ3732 CPH → FCO May 22, 16:55 UTCMay 22, 19:00 UTC2h 5m
2026-05-22 NSZ3527 MAN → CPH May 22, 14:10 UTCMay 22, 15:35 UTC1h 25m
2026-05-22 NSZ3526 CPH → MAN May 22, 11:25 UTCMay 22, 13:00 UTC1h 35m
2026-05-22 NSZ3751 BGY → CPH May 22, 08:25 UTCMay 22, 10:15 UTC1h 50m
2026-05-22 NSZ3750 CPH → BGY May 22, 05:35 UTCMay 22, 07:20 UTC1h 45m
2026-05-21 NSZ4KP NCE → CPH May 21, 19:50 UTCMay 21, 21:45 UTC1h 55m
2026-05-21 NSZ3646 CPH → NCE May 21, 16:55 UTCMay 21, 18:50 UTC1h 55m
2026-05-21 NSZ3503 EDI → CPH May 21, 14:40 UTCMay 21, 16:01 UTC1h 20m
2026-05-21 NSZ3502 CPH → EDI May 21, 11:45 UTCMay 21, 13:30 UTC1h 45m

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

Mode-S 4ACB23 frequently asked

What is Mode-S code 4ACB23?
4ACB23 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RYC.
Where is Mode-S 4ACB23 registered?
Mode-S code 4ACB23 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACB23 broadcasting right now?
Yes. Mode-S 4ACB23 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACB23, octal 22545443, decimal 4,901,667.
What flights does 4ACB23 operate?
Mode-S 4ACB23 has broadcast 20 distinct callsigns, including NSZ5070, NSZ5051, NSZ8KC, NSZ5074, NSZ5071.