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 NSZ9BP · 37,000 ft
Flights observed
465
Distinct callsigns
20
Country
SE
Last broadcast
1h 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
NSZ5051 - 13 2026-07-08
NSZ5070 - 12 2026-07-13
NSZ8KC Norwegian Air Sweden AOC 10 2026-06-03
NSZ5074 - 9 2026-06-30
NSZ5071 - 9 2026-07-13
NSZ5023 - 9 2026-07-10
NSZ2TU - 8 2026-07-10
NSZ80W - 7 2026-07-12
NSZ5TP - 7 2026-07-01
NSZ5085 - 7 2026-07-12
NSZ3KQ - 7 2026-07-13
NSZ3510 - 7 2026-07-01
NSZ9BP - 6 2026-07-14
NSZ8UK - 6 2026-07-13
NSZ5037 Norwegian Air Sweden AOC 6 2026-06-02
NSZ5036 Norwegian Air Sweden AOC 6 2026-06-02
NSZ5021 - 6 2026-07-12
NSZ3503 Norwegian Air Sweden AOC 6 2026-06-11
NSZ3502 Norwegian Air Sweden AOC 6 2026-06-11
NSZ5075 - 5 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 NSZ9BP - Jul 14, 08:40 UTCJul 14, 10:45 UTC2h 5m
2026-07-14 NSZ5TQ - Jul 14, 04:25 UTCJul 14, 07:35 UTC3h 10m
2026-07-13 NSZ8UK - Jul 13, 18:05 UTCJul 13, 21:55 UTC3h 50m
2026-07-13 NSZ3KQ - Jul 13, 13:30 UTCJul 13, 17:05 UTC3h 35m
2026-07-13 NSZ5071 - Jul 13, 08:45 UTCJul 13, 12:20 UTC3h 35m
2026-07-13 NSZ5070 - Jul 13, 04:30 UTCJul 13, 07:35 UTC3h 5m
2026-07-12 NSZ5085 - Jul 12, 18:40 UTCJul 12, 22:00 UTC3h 20m
2026-07-12 NSZ80W - Jul 12, 14:15 UTCJul 12, 17:15 UTC3h 0m
2026-07-12 NSZ5021 - Jul 12, 09:15 UTCJul 12, 13:01 UTC3h 45m
2026-07-12 NSZ2JM - Jul 12, 04:25 UTCJul 12, 08:01 UTC3h 35m
2026-07-11 NSZ5PE - Jul 11, 18:35 UTCJul 11, 22:35 UTC4h 0m
2026-07-11 NSZ5DM - Jul 11, 13:35 UTCJul 11, 17:25 UTC3h 50m
2026-07-11 NSZ7ER - Jul 11, 08:40 UTCJul 11, 12:10 UTC3h 30m
2026-07-11 NSZ6VU - Jul 11, 04:20 UTCJul 11, 07:50 UTC3h 30m
2026-07-10 NSZ5023 - Jul 10, 17:50 UTCJul 10, 21:30 UTC3h 40m
2026-07-10 NSZ2TU - Jul 10, 13:05 UTCJul 10, 16:45 UTC3h 40m
2026-07-10 NSZ5085 - Jul 10, 08:40 UTCJul 10, 11:40 UTC3h 0m
2026-07-10 NSZ80W - Jul 10, 04:35 UTCJul 10, 07:45 UTC3h 10m
2026-07-09 NSZ5085 - Jul 9, 18:30 UTCJul 9, 21:35 UTC3h 5m
2026-07-09 NSZ80W - Jul 9, 14:20 UTCJul 9, 17:20 UTC3h 0m
2026-07-09 NSZ5021 - Jul 9, 09:20 UTCJul 9, 12:50 UTC3h 30m
2026-07-09 NSZ2JM - Jul 9, 04:30 UTCJul 9, 08:00 UTC3h 30m
2026-07-08 NSZ3MK - Jul 8, 19:25 UTCJul 8, 22:35 UTC3h 10m
2026-07-08 NSZ8VD - Jul 8, 15:05 UTCJul 8, 18:25 UTC3h 20m
2026-07-08 NSZ5051 - Jul 8, 09:55 UTCJul 8, 13:45 UTC3h 50m
2026-07-08 NSZ90Y - Jul 8, 04:50 UTCJul 8, 08:50 UTC4h 0m
2026-07-07 NSZ9YB - Jul 7, 19:15 UTCJul 7, 22:25 UTC3h 10m
2026-07-07 NSZ3231 OSL → CPH Jul 7, 17:35 UTCJul 7, 18:25 UTC50m
2026-07-07 NSZ3230 - Jul 7, 16:00 UTCJul 7, 16:55 UTC55m
2026-07-07 NSZ89C PRG → CPH Jul 7, 12:55 UTCJul 7, 14:00 UTC1h 5m
2026-07-07 NSZ8ML - Jul 7, 11:00 UTCJul 7, 11:55 UTC55m
2026-07-07 NSZ3731 - Jul 7, 07:55 UTCJul 7, 10:05 UTC2h 10m
2026-07-07 NSZ3730 - Jul 7, 04:25 UTCJul 7, 06:30 UTC2h 5m
2026-07-06 NSZ3741 VCE → CPH Jul 6, 20:40 UTCJul 6, 22:20 UTC1h 40m
2026-07-06 NSZ3740 - Jul 6, 17:20 UTCJul 6, 18:55 UTC1h 35m
2026-07-06 NSZ3631 - Jul 6, 14:55 UTCJul 6, 16:30 UTC1h 35m
2026-07-06 NSZ3630 CPH → BSL Jul 6, 12:30 UTCJul 6, 14:00 UTC1h 30m
2026-07-06 NSZ3627 TLS → CPH Jul 6, 09:15 UTCJul 6, 11:35 UTC2h 20m
2026-07-06 NSZ3626 - Jul 6, 05:55 UTCJul 6, 08:00 UTC2h 5m
2026-07-05 NSZ3309 MUC → CPH Jul 5, 20:55 UTCJul 5, 22:20 UTC1h 25m
2026-07-05 NSZ3308 CPH → MUC Jul 5, 17:55 UTCJul 5, 19:15 UTC1h 20m
2026-07-05 NSZ3563 KRK → CPH Jul 5, 15:25 UTCJul 5, 16:50 UTC1h 25m
2026-07-05 NSZ3562 - Jul 5, 13:20 UTCJul 5, 14:25 UTC1h 5m
2026-07-05 NSZ3613 OPO → CPH Jul 5, 09:25 UTCJul 5, 12:20 UTC2h 55m
2026-07-05 NSZ2EM - Jul 5, 05:15 UTCJul 5, 08:20 UTC3h 5m
2026-07-04 NSZ3TW - Jul 4, 16:15 UTCJul 4, 19:30 UTC3h 15m
2026-07-04 NSZ2BL - Jul 4, 11:55 UTCJul 4, 15:10 UTC3h 15m
2026-07-04 NSZ9EF - Jul 4, 08:35 UTCJul 4, 10:55 UTC2h 20m
2026-07-04 NSZ3738 - Jul 4, 04:10 UTCJul 4, 06:10 UTC2h 0m
2026-07-03 NSZ3521 LGW → CPH Jul 3, 19:50 UTCJul 3, 21:15 UTC1h 25m

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 NSZ5051, NSZ5070, NSZ8KC, NSZ5074, NSZ5071.