Apparatus

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sensors Mode-S transponder

4ACA98

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTX · BOEING 737 MAX 8

Hex
4ACA98
Octal
22545230
Decimal
4,901,528
Country
SE
Tail
SE-RTX
Type
B38M
Broadcasting now · callsign NSZ9YB · 35,000 ft
Flights observed
447
Distinct callsigns
20
Country
SE
Last broadcast
1h ago

Current position

4ACA98 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA98 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
NSZ5023 - 12 2026-07-13
NSZ2TU - 12 2026-07-13
NSZ5074 - 11 2026-07-14
NSZ5071 - 11 2026-07-09
NSZ9BP - 10 2026-07-09
NSZ5070 - 10 2026-07-09
NSZ5TQ - 9 2026-07-09
NSZ5075 - 9 2026-07-12
NSZ3731 - 7 2026-06-26
NSZ3730 - 7 2026-06-26
NSZ8UK - 6 2026-06-19
NSZ80W - 6 2026-07-13
NSZ6PY Norwegian Air Sweden AOC 6 2026-05-26
NSZ5141 - 6 2026-07-07
NSZ5140 - 6 2026-07-07
NSZ5085 - 6 2026-07-13
NSZ5021 - 6 2026-07-14
NSZ3KQ - 6 2026-06-19
NSZ2JM - 6 2026-07-14
NSZ1KS Norwegian Air Sweden AOC 6 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 NSZ9YB - Jul 14, 18:55 UTCJul 14, 20:00 UTC1h 5m
2026-07-14 NSZ5074 - Jul 14, 14:35 UTCJul 14, 17:45 UTC3h 10m
2026-07-14 NSZ5021 - Jul 14, 09:45 UTCJul 14, 13:30 UTC3h 45m
2026-07-14 NSZ2JM - Jul 14, 04:55 UTCJul 14, 08:30 UTC3h 35m
2026-07-13 NSZ5023 - Jul 13, 18:05 UTCJul 13, 22:05 UTC4h 0m
2026-07-13 NSZ2TU - Jul 13, 13:15 UTCJul 13, 16:55 UTC3h 40m
2026-07-13 NSZ5085 - Jul 13, 08:50 UTCJul 13, 12:15 UTC3h 25m
2026-07-13 NSZ80W - Jul 13, 04:30 UTCJul 13, 07:40 UTC3h 10m
2026-07-12 NSZ5075 - Jul 12, 18:30 UTCJul 12, 22:05 UTC3h 35m
2026-07-12 NSZ5074 - Jul 12, 14:20 UTCJul 12, 17:20 UTC3h 0m
2026-07-12 NSZ1NW - Jul 12, 09:10 UTCJul 12, 13:10 UTC4h 0m
2026-07-12 NSZ6LB - Jul 12, 04:15 UTCJul 12, 07:55 UTC3h 40m
2026-07-11 NSZ5075 - Jul 11, 18:30 UTCJul 11, 21:50 UTC3h 20m
2026-07-11 NSZ5074 - Jul 11, 14:20 UTCJul 11, 17:25 UTC3h 5m
2026-07-11 NSZ5021 - Jul 11, 09:25 UTCJul 11, 13:10 UTC3h 45m
2026-07-11 NSZ2JM - Jul 11, 04:35 UTCJul 11, 08:10 UTC3h 35m
2026-07-10 NSZ5FT - Jul 10, 18:05 UTCJul 10, 21:20 UTC3h 16m
2026-07-10 NSZ4HP - Jul 10, 13:30 UTCJul 10, 16:45 UTC3h 15m
2026-07-10 NSZ28T - Jul 10, 09:05 UTCJul 10, 12:10 UTC3h 5m
2026-07-10 NSZ8FU - Jul 10, 04:55 UTCJul 10, 08:05 UTC3h 10m
2026-07-09 NSZ9BP - Jul 9, 18:45 UTCJul 9, 22:15 UTC3h 30m
2026-07-09 NSZ5TQ - Jul 9, 13:15 UTCJul 9, 16:35 UTC3h 20m
2026-07-09 NSZ5071 - Jul 9, 08:55 UTCJul 9, 12:10 UTC3h 15m
2026-07-09 NSZ5070 - Jul 9, 04:25 UTCJul 9, 07:35 UTC3h 10m
2026-07-08 NSZ5023 - Jul 8, 18:05 UTCJul 8, 21:45 UTC3h 40m
2026-07-08 NSZ2TU - Jul 8, 13:05 UTCJul 8, 16:50 UTC3h 45m
2026-07-08 NSZ5085 - Jul 8, 08:40 UTCJul 8, 11:40 UTC3h 0m
2026-07-08 NSZ80W - Jul 8, 04:40 UTCJul 8, 07:45 UTC3h 5m
2026-07-07 NSZ5023 - Jul 7, 17:50 UTCJul 7, 21:20 UTC3h 30m
2026-07-07 NSZ2TU - Jul 7, 13:00 UTCJul 7, 16:45 UTC3h 45m
2026-07-07 NSZ5141 - Jul 7, 08:55 UTCJul 7, 11:25 UTC2h 30m
2026-07-07 NSZ5140 - Jul 7, 05:15 UTCJul 7, 07:50 UTC2h 35m
2026-07-06 NSZ5053 - Jul 6, 18:20 UTCJul 6, 22:15 UTC3h 55m
2026-07-06 NSZ5052 - Jul 6, 13:20 UTCJul 6, 17:15 UTC3h 55m
2026-07-06 NSZ5037 - Jul 6, 08:35 UTCJul 6, 12:00 UTC3h 25m
2026-07-06 NSZ5036 - Jul 6, 04:05 UTCJul 6, 07:30 UTC3h 25m
2026-07-05 NSZ5023 - Jul 5, 17:35 UTCJul 5, 21:10 UTC3h 35m
2026-07-05 NSZ2TU - Jul 5, 12:55 UTCJul 5, 16:40 UTC3h 45m
2026-07-05 NSZ5141 - Jul 5, 09:00 UTCJul 5, 11:35 UTC2h 35m
2026-07-05 NSZ5140 - Jul 5, 05:15 UTCJul 5, 07:50 UTC2h 35m
2026-07-04 NSZ5075 - Jul 4, 18:30 UTCJul 4, 21:50 UTC3h 20m
2026-07-04 NSZ5074 - Jul 4, 14:25 UTCJul 4, 17:35 UTC3h 10m
2026-07-04 NSZ5021 - Jul 4, 09:10 UTCJul 4, 12:45 UTC3h 35m
2026-07-04 NSZ2JM - Jul 4, 04:25 UTCJul 4, 08:05 UTC3h 40m
2026-07-03 NSZ9YB - Jul 3, 19:15 UTCJul 3, 22:25 UTC3h 10m
2026-07-03 NSZ5074 - Jul 3, 14:50 UTCJul 3, 18:10 UTC3h 20m
2026-07-03 NSZ5051 - Jul 3, 09:35 UTCJul 3, 13:25 UTC3h 50m
2026-07-03 NSZ90Y AGP → ARN Jul 3, 04:35 UTCJul 3, 08:30 UTC3h 55m
2026-07-02 NSZ5023 - Jul 2, 17:40 UTCJul 2, 21:25 UTC3h 45m
2026-07-02 NSZ2TU - Jul 2, 13:00 UTCJul 2, 16:35 UTC3h 35m

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

Mode-S 4ACA98 frequently asked

What is Mode-S code 4ACA98?
4ACA98 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTX.
Where is Mode-S 4ACA98 registered?
Mode-S code 4ACA98 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA98 broadcasting right now?
Yes. Mode-S 4ACA98 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA98, octal 22545230, decimal 4,901,528.
What flights does 4ACA98 operate?
Mode-S 4ACA98 has broadcast 20 distinct callsigns, including NSZ5023, NSZ2TU, NSZ5074, NSZ5071, NSZ9BP.