Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4ACA9A

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTZ · BOEING 737 MAX 8

Hex
4ACA9A
Octal
22545232
Decimal
4,901,530
Country
SE
Tail
SE-RTZ
Type
B38M
Broadcasting now · callsign NSZ5DM · 38,000 ft
Flights observed
540
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 22:20 UTC

Current position

4ACA9A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA9A 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
NSZ3211 - 9 2026-07-15
NSZ3206 - 9 2026-07-15
NSZ3646 - 7 2026-07-14
NSZ3207 Norwegian Air Sweden AOC 7 2026-05-21
NSZ5372 - 6 2026-06-15
NSZ4FU Norwegian Air Sweden AOC 6 2026-06-06
NSZ3210 Norwegian Air Sweden AOC 6 2026-05-21
NSZ7CB - 5 2026-06-29
NSZ64N - 5 2026-06-27
NSZ5YR - 5 2026-06-14
NSZ5ML Norwegian Air Sweden AOC 5 2026-06-13
NSZ5357 Norwegian Air Sweden AOC 5 2026-06-07
NSZ5071 Norwegian Air Sweden AOC 5 2026-07-25
NSZ5070 Norwegian Air Sweden AOC 5 2026-07-25
NSZ46BA - 5 2026-06-29
NSZ3LZ - 5 2026-06-15
NSZ3LE Norwegian Air Sweden AOC 5 2026-06-15
NSZ3731 Norwegian Air Sweden AOC 5 2026-05-21
NSZ3730 Norwegian Air Sweden AOC 5 2026-05-21
NSZ3519 Norwegian Air Sweden AOC 5 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ5075 CPH → AGP Jul 26, 19:10 UTCJul 26, 22:20 UTC3h 10m
2026-07-26 NSZ5074 AGP → CPH Jul 26, 14:45 UTCJul 26, 18:15 UTC3h 30m
2026-07-26 NSZ1NW NYO → AGP Jul 26, 09:25 UTCJul 26, 13:10 UTC3h 45m
2026-07-26 NSZ6LB AGP → NYO Jul 26, 04:35 UTCJul 26, 08:10 UTC3h 36m
2026-07-25 NSZ5123 HEL → AGP Jul 25, 19:00 UTCJul 25, 23:25 UTC4h 25m
2026-07-25 NSZ9ED AGP → HEL Jul 25, 14:05 UTCJul 25, 18:00 UTC3h 55m
2026-07-25 NSZ5071 CPH → AGP Jul 25, 08:35 UTCJul 25, 12:05 UTC3h 30m
2026-07-25 NSZ5070 AGP → CPH Jul 25, 04:25 UTCJul 25, 07:40 UTC3h 15m
2026-07-24 NSZ5FT HAU → AGP Jul 24, 17:55 UTCJul 24, 21:35 UTC3h 40m
2026-07-24 NSZ4HP - Jul 24, 13:40 UTCJul 24, 16:40 UTC3h 0m
2026-07-24 NSZ28T AAL → AGP Jul 24, 08:55 UTCJul 24, 12:25 UTC3h 30m
2026-07-24 NSZ8FU AGP → AAL Jul 24, 04:45 UTCJul 24, 08:00 UTC3h 15m
2026-07-23 NSZ5085 BLL → AGP Jul 23, 18:30 UTCJul 23, 21:30 UTC3h 0m
2026-07-23 NSZ80W AGP → BLL Jul 23, 14:25 UTCJul 23, 17:30 UTC3h 5m
2026-07-23 NSZ5021 OSL → AGP Jul 23, 09:50 UTCJul 23, 13:15 UTC3h 25m
2026-07-23 NSZ2JM AGP → OSL Jul 23, 04:25 UTCJul 23, 08:10 UTC3h 45m
2026-07-22 NSZ3MK AAL → AGP Jul 22, 19:15 UTCJul 22, 22:25 UTC3h 10m
2026-07-22 NSZ8VD AGP → AAL Jul 22, 15:05 UTCJul 22, 18:20 UTC3h 15m
2026-07-22 NSZ5051 ARN → AGP Jul 22, 11:10 UTCJul 22, 13:55 UTC2h 45m
2026-07-22 NSZ90Y AGP → ARN Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-21 NSZ5PE ARN → AGP Jul 21, 18:30 UTCJul 21, 22:25 UTC3h 55m
2026-07-21 NSZ5DM AGP → ARN Jul 21, 13:20 UTCJul 21, 17:20 UTC4h 0m
2026-07-21 NSZ9BP GOT → AGP Jul 21, 08:45 UTCJul 21, 12:00 UTC3h 15m
2026-07-21 NSZ5TQ - Jul 21, 04:25 UTCJul 21, 07:50 UTC3h 25m
2026-07-20 NSZ8UK TRF → AGP Jul 20, 17:55 UTCJul 20, 21:20 UTC3h 25m
2026-07-20 NSZ3KQ AGP → TRF Jul 20, 13:30 UTCJul 20, 16:50 UTC3h 20m
2026-07-20 NSZ5071 - Jul 20, 08:50 UTCJul 20, 12:10 UTC3h 20m
2026-07-20 NSZ5070 AGP → CPH Jul 20, 04:30 UTCJul 20, 07:35 UTC3h 5m
2026-07-19 NSZ5085 - Jul 19, 18:15 UTCJul 19, 21:30 UTC3h 15m
2026-07-19 NSZ80W AGP → BLL Jul 19, 14:15 UTCJul 19, 17:15 UTC3h 0m
2026-07-19 NSZ5021 OSL → AGP Jul 19, 09:15 UTCJul 19, 12:55 UTC3h 40m
2026-07-19 NSZ2JM AGP → OSL Jul 19, 04:35 UTCJul 19, 08:10 UTC3h 35m
2026-07-18 NSZ5PE - Jul 18, 18:20 UTCJul 18, 22:45 UTC4h 25m
2026-07-18 NSZ5DM - Jul 18, 13:25 UTCJul 18, 17:00 UTC3h 35m
2026-07-18 NSZ7ER VXO → AGP Jul 18, 08:40 UTCJul 18, 12:15 UTC3h 35m
2026-07-18 NSZ6VU AGP → VXO Jul 18, 04:25 UTCJul 18, 07:35 UTC3h 10m
2026-07-17 NSZ5PE - Jul 17, 18:15 UTCJul 17, 22:20 UTC4h 5m
2026-07-17 NSZ5DM - Jul 17, 13:25 UTCJul 17, 17:05 UTC3h 40m
2026-07-17 NSZ5071 - Jul 17, 08:49 UTCJul 17, 12:15 UTC3h 25m
2026-07-17 NSZ5070 - Jul 17, 04:29 UTCJul 17, 07:30 UTC3h 0m
2026-07-16 NSZ9YB - Jul 16, 19:05 UTCJul 16, 22:35 UTC3h 30m
2026-07-16 NSZ541B AMS → CPH Jul 16, 17:05 UTCJul 16, 18:05 UTC1h 0m
2026-07-16 NSZ54CA - Jul 16, 14:45 UTCJul 16, 15:49 UTC1h 5m
2026-07-15 NSZ3211 ARN → CPH Jul 15, 18:15 UTCJul 15, 19:05 UTC50m
2026-07-15 NSZ3803 - Jul 15, 16:35 UTCJul 15, 17:15 UTC40m
2026-07-15 NSZ3802 - Jul 15, 15:00 UTCJul 15, 15:30 UTC30m
2026-07-15 NSZ3206 CPH → ARN Jul 15, 13:15 UTCJul 15, 14:10 UTC55m
2026-07-15 NSZ3531 MLA → CPH Jul 15, 09:10 UTCJul 15, 12:15 UTC3h 5m
2026-07-15 NSZ3530 CPH → MLA Jul 15, 05:15 UTCJul 15, 08:10 UTC2h 55m
2026-07-14 NSZ4KP NCE → CPH Jul 14, 20:35 UTCJul 14, 22:25 UTC1h 50m

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

Mode-S 4ACA9A frequently asked

What is Mode-S code 4ACA9A?
4ACA9A is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTZ.
Where is Mode-S 4ACA9A registered?
Mode-S code 4ACA9A is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA9A broadcasting right now?
Yes. Mode-S 4ACA9A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA9A, octal 22545232, decimal 4,901,530.
What flights does 4ACA9A operate?
Mode-S 4ACA9A has broadcast 20 distinct callsigns, including NSZ3211, NSZ3206, NSZ3646, NSZ3207, NSZ5372.