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
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
505
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S 4ACA98.

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
NSZ5074 Norwegian Air Sweden AOC 14 2026-07-19
NSZ5023 - 12 2026-07-13
NSZ2TU - 12 2026-07-13
NSZ9BP - 11 2026-07-17
NSZ5075 - 11 2026-07-18
NSZ5071 - 11 2026-07-09
NSZ5TQ - 10 2026-07-17
NSZ5070 - 10 2026-07-09
NSZ5021 Norwegian Air Sweden AOC 8 2026-07-18
NSZ3731 Norwegian Air Sweden AOC 8 2026-07-24
NSZ3730 Norwegian Air Sweden AOC 8 2026-07-24
NSZ2JM Norwegian Air Sweden AOC 8 2026-07-18
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
NSZ3KQ - 6 2026-06-19
NSZ3733 Norwegian Air Sweden AOC 6 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ3747 BLQ → CPH Jul 26, 19:55 UTCJul 26, 21:40 UTC1h 45m
2026-07-26 NSZ3746 CPH → BLQ Jul 26, 16:55 UTCJul 26, 18:35 UTC1h 40m
2026-07-26 NSZ3637 CDG → CPH Jul 26, 14:20 UTCJul 26, 15:50 UTC1h 30m
2026-07-26 NSZ3636 CPH → CDG Jul 26, 11:40 UTCJul 26, 13:10 UTC1h 30m
2026-07-25 NSZ3TW AGP → CPH Jul 25, 16:00 UTCJul 25, 19:00 UTC3h 0m
2026-07-25 NSZ2BL CPH → AGP Jul 25, 11:25 UTCJul 25, 14:55 UTC3h 30m
2026-07-25 NSZ9EF NAP → CPH Jul 25, 08:20 UTCJul 25, 10:35 UTC2h 15m
2026-07-25 NSZ3738 CPH → NAP Jul 25, 04:10 UTCJul 25, 06:10 UTC2h 0m
2026-07-24 NSZ3733 FCO → CPH Jul 24, 20:15 UTCJul 24, 22:25 UTC2h 10m
2026-07-24 NSZ3732 CPH → FCO Jul 24, 16:55 UTCJul 24, 18:55 UTC2h 0m
2026-07-24 NSZ3527 MAN → CPH Jul 24, 14:40 UTCJul 24, 16:05 UTC1h 25m
2026-07-24 NSZ5GL CPH → MAN Jul 24, 11:45 UTCJul 24, 13:15 UTC1h 30m
2026-07-24 NSZ3731 FCO → CPH Jul 24, 08:25 UTCJul 24, 10:40 UTC2h 15m
2026-07-24 NSZ3730 CPH → FCO Jul 24, 04:25 UTCJul 24, 06:15 UTC1h 50m
2026-07-23 NSZ4KP NCE → CPH Jul 23, 20:15 UTCJul 23, 22:25 UTC2h 10m
2026-07-23 NSZ3646 CPH → NCE Jul 23, 17:25 UTCJul 23, 19:10 UTC1h 45m
2026-07-23 NSZ3643 NCE → CPH Jul 23, 14:20 UTCJul 23, 16:30 UTC2h 10m
2026-07-23 NSZ64NY CPH → NCE Jul 23, 11:30 UTCJul 23, 13:20 UTC1h 50m
2026-07-23 NSZ3539 AMS → CPH Jul 23, 08:40 UTCJul 23, 09:50 UTC1h 10m
2026-07-23 NSZ3538 CPH → AMS Jul 23, 06:30 UTCJul 23, 07:35 UTC1h 5m
2026-07-22 NSZ3367 HER → CPH Jul 22, 17:50 UTCJul 22, 21:05 UTC3h 15m
2026-07-22 NSZ3366 CPH → HER Jul 22, 13:15 UTCJul 22, 16:05 UTC2h 50m
2026-07-22 NSZ3738 CPH → NAP Jul 22, 04:35 UTCJul 22, 05:25 UTC50m
2026-07-21 NSZ9GY CDG → CPH Jul 21, 20:20 UTCJul 21, 21:50 UTC1h 30m
2026-07-21 NSZ8FI CPH → CDG Jul 21, 17:35 UTCJul 21, 19:05 UTC1h 30m
2026-07-21 NSZ3303 BER → CPH Jul 21, 16:00 UTCJul 21, 16:45 UTC45m
2026-07-21 NSZ3302 - Jul 21, 14:35 UTCJul 21, 15:10 UTC35m
2026-07-21 NSZ3093 - Jul 21, 13:10 UTCJul 21, 13:40 UTC30m
2026-07-21 NSZ8YZ CPH → AAL Jul 21, 11:45 UTCJul 21, 12:15 UTC30m
2026-07-21 NSZ3747 BLQ → CPH Jul 21, 09:00 UTCJul 21, 10:50 UTC1h 50m
2026-07-21 NSZ3746 CPH → BLQ Jul 21, 05:55 UTCJul 21, 07:40 UTC1h 45m
2026-07-20 NSZ3741 VCE → CPH Jul 20, 19:55 UTCJul 20, 21:30 UTC1h 35m
2026-07-20 NSZ3740 CPH → VCE Jul 20, 17:20 UTCJul 20, 18:55 UTC1h 35m
2026-07-20 NSZ3631 BSL → CPH Jul 20, 15:05 UTCJul 20, 16:25 UTC1h 20m
2026-07-20 NSZ3630 CPH → BSL Jul 20, 12:35 UTCJul 20, 14:00 UTC1h 25m
2026-07-20 NSZ3627 TLS → CPH Jul 20, 09:20 UTCJul 20, 11:35 UTC2h 15m
2026-07-20 NSZ3626 CPH → TLS Jul 20, 06:05 UTCJul 20, 08:15 UTC2h 10m
2026-07-19 NSZ3305 BER → CPH Jul 19, 21:00 UTCJul 19, 21:40 UTC40m
2026-07-19 NSZ3304 CPH → BER Jul 19, 19:05 UTCJul 19, 19:40 UTC35m
2026-07-19 NSZ5074 AGP → CPH Jul 19, 14:20 UTCJul 19, 17:25 UTC3h 5m
2026-07-19 NSZ1NW - Jul 19, 09:00 UTCJul 19, 12:50 UTC3h 50m
2026-07-19 NSZ6LB - Jul 19, 04:25 UTCJul 19, 07:55 UTC3h 30m
2026-07-18 NSZ5075 - Jul 18, 18:30 UTCJul 18, 21:55 UTC3h 25m
2026-07-18 NSZ5074 - Jul 18, 14:10 UTCJul 18, 17:15 UTC3h 5m
2026-07-18 NSZ5021 OSL → AGP Jul 18, 09:15 UTCJul 18, 13:00 UTC3h 45m
2026-07-18 NSZ2JM AGP → OSL Jul 18, 04:35 UTCJul 18, 08:05 UTC3h 30m
2026-07-17 NSZ5FT - Jul 17, 18:40 UTCJul 17, 21:55 UTC3h 15m
2026-07-17 NSZ4HP - Jul 17, 14:20 UTCJul 17, 17:35 UTC3h 15m
2026-07-17 NSZ9BP - Jul 17, 09:35 UTCJul 17, 13:10 UTC3h 35m
2026-07-17 NSZ5TQ - Jul 17, 05:10 UTCJul 17, 08:20 UTC3h 10m

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?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
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 NSZ5074, NSZ5023, NSZ2TU, NSZ9BP, NSZ5075.