Apparatus

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sensors Mode-S transponder

4ACA84

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTD · BOEING 737 MAX 8

Hex
4ACA84
Octal
22545204
Decimal
4,901,508
Country
SE
Tail
SE-RTD
Type
B38M
Broadcasting now · callsign NSZ4528 · 38,000 ft
Flights observed
231
Distinct callsigns
20
Country
SE
Last broadcast
2h ago

Current position

4ACA84 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA84 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
NSZ83AH Norwegian Air Sweden AOC 5 2026-05-10
NSZ4AW Norwegian Air Sweden AOC 5 2026-05-10
NSZ2941 Norwegian Air Sweden AOC 5 2026-05-05
NSZ2913 Norwegian Air Sweden AOC 5 2026-05-10
NSZ9WP Norwegian Air Sweden AOC 4 2026-05-10
NSZ4110 Norwegian Air Sweden AOC 4 2026-05-27
NSZ3MB Norwegian Air Sweden AOC 4 2026-05-22
NSZ2940 Norwegian Air Sweden AOC 4 2026-05-05
NSZ2621 Norwegian Air Sweden AOC 4 2026-05-11
NSZ2620 Norwegian Air Sweden AOC 4 2026-05-11
NSZ6RD Norwegian Air Sweden AOC 3 2026-05-11
NSZ5NE Norwegian Air Sweden AOC 3 2026-05-15
NSZ56J Norwegian Air Sweden AOC 3 2026-05-15
NSZ51M Norwegian Air Sweden AOC 3 2026-05-22
NSZ4MF Norwegian Air Sweden AOC 3 2026-05-22
NSZ4527 Norwegian Air Sweden AOC 3 2026-05-30
NSZ4114 Norwegian Air Sweden AOC 3 2026-05-27
NSZ4113 Norwegian Air Sweden AOC 3 2026-05-27
NSZ4109 Norwegian Air Sweden AOC 3 2026-05-27
NSZ3YT Norwegian Air Sweden AOC 3 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 NSZ4527 ARN → RAK May 30, 13:10 UTCMay 30, 17:35 UTC4h 25m
2026-05-30 NSZ4318 MPL → ARN May 30, 08:40 UTCMay 30, 11:25 UTC2h 45m
2026-05-30 NSZ4317 ARN → MPL May 30, 04:50 UTCMay 30, 07:40 UTC2h 50m
2026-05-29 NSZ60X LGW → ARN May 29, 19:50 UTCMay 29, 21:45 UTC1h 55m
2026-05-29 NSZ59T ARN → LGW May 29, 16:30 UTCMay 29, 18:45 UTC2h 15m
2026-05-29 NSZ6LA LGW → ARN May 29, 13:00 UTCMay 29, 15:00 UTC2h 0m
2026-05-29 NSZ5WU ARN → LGW May 29, 09:15 UTCMay 29, 11:30 UTC2h 15m
2026-05-29 NSZ96Y CPH → ARN May 29, 07:00 UTCMay 29, 07:55 UTC55m
2026-05-29 NSZ5YB CPH → ARN May 29, 05:10 UTCMay 29, 06:00 UTC50m
2026-05-28 NSZ4354 AMS → ARN May 28, 19:40 UTCMay 28, 21:20 UTC1h 40m
2026-05-28 NSZ4353 ARN → AMS May 28, 17:05 UTCMay 28, 18:35 UTC1h 30m
2026-05-28 NSZ4556 VNO → ARN May 28, 12:35 UTCMay 28, 13:45 UTC1h 10m
2026-05-28 NSZ4555 ARN → VNO May 28, 10:40 UTCMay 28, 11:45 UTC1h 5m
2026-05-28 NSZ38K LLA → ARN May 28, 08:40 UTCMay 28, 09:45 UTC1h 5m
2026-05-28 NSZ35A ARN → LLA May 28, 06:50 UTCMay 28, 07:50 UTC1h 0m
2026-05-28 NSZ3LW LLA → ARN May 28, 04:50 UTCMay 28, 05:50 UTC1h 0m
2026-05-27 NSZ49H ARN → LLA May 27, 19:45 UTCMay 27, 20:40 UTC55m
2026-05-27 NSZ4114 OSL → ARN May 27, 17:55 UTCMay 27, 18:40 UTC45m
2026-05-27 NSZ4113 ARN → OSL May 27, 16:30 UTCMay 27, 17:15 UTC45m
2026-05-27 NSZ4110 OSL → ARN May 27, 14:55 UTCMay 27, 15:45 UTC50m
2026-05-27 NSZ4109 ARN → OSL May 27, 13:15 UTCMay 27, 14:05 UTC50m
2026-05-27 NSZ2MP NCE → ARN May 27, 09:05 UTCMay 27, 11:50 UTC2h 45m
2026-05-27 NSZ3YT ARN → NCE May 27, 04:59 UTCMay 27, 07:35 UTC2h 35m
2026-05-26 NSZ4370 PSA → ARN May 26, 11:30 UTCMay 26, 14:05 UTC2h 35m
2026-05-26 NSZ4369 ARN → PSA May 26, 07:55 UTCMay 26, 10:25 UTC2h 30m
2026-05-25 NSZ4338 SPU → ARN May 25, 19:35 UTCMay 25, 21:54 UTC2h 20m
2026-05-25 NSZ4337 ARN → SPU May 25, 16:05 UTCMay 25, 18:15 UTC2h 10m
2026-05-25 NSZ4462 HRG → ARN May 25, 13:25 UTCMay 25, 15:05 UTC1h 40m
2026-05-25 NSZ4461 ARN → HRG May 25, 10:00 UTCMay 25, 12:20 UTC2h 20m
2026-05-25 NSZ8GH UME → ARN May 25, 08:05 UTCMay 25, 08:45 UTC40m
2026-05-25 NSZ5B ARN → UME May 25, 06:30 UTCMay 25, 07:05 UTC35m
2026-05-25 NSZ2EF UME → ARN May 25, 04:45 UTCMay 25, 05:30 UTC45m
2026-05-24 NSZ1KM ARN → UME May 24, 20:35 UTCMay 24, 21:10 UTC35m
2026-05-24 NSZ18X UME → ARN May 24, 19:15 UTCMay 24, 20:00 UTC45m
2026-05-24 NSZ15Y ARN → UME May 24, 17:45 UTCMay 24, 18:20 UTC35m
2026-05-24 NSZ12U UME → ARN May 24, 16:00 UTCMay 24, 16:40 UTC40m
2026-05-24 NSZ13R ARN → UME May 24, 14:10 UTCMay 24, 14:45 UTC35m
2026-05-24 NSZ4CD LLA → ARN May 24, 12:10 UTCMay 24, 13:05 UTC55m
2026-05-24 NSZ39C ARN → LLA May 24, 10:20 UTCMay 24, 11:20 UTC1h 0m
2026-05-24 NSZ38K LLA → ARN May 24, 08:25 UTCMay 24, 09:25 UTC1h 0m
2026-05-24 NSZ35A ARN → LLA May 24, 06:45 UTCMay 24, 07:40 UTC55m
2026-05-23 NSZ4362 OLB → ARN May 23, 18:30 UTCMay 23, 21:30 UTC3h 0m
2026-05-23 NSZ3AM ARN → OLB May 23, 14:35 UTCMay 23, 17:15 UTC2h 40m
2026-05-23 NSZ72FK CTA → ARN May 23, 10:15 UTCMay 23, 13:35 UTC3h 20m
2026-05-23 NSZ4371 ARN → CTA May 23, 05:35 UTCMay 23, 08:45 UTC3h 10m
2026-05-22 NSZ4MF BCN → ARN May 22, 18:30 UTCMay 22, 21:40 UTC3h 10m
2026-05-22 NSZ3MB ARN → BCN May 22, 14:00 UTCMay 22, 17:10 UTC3h 10m
2026-05-22 NSZ2ES LGW → ARN May 22, 10:10 UTCMay 22, 12:10 UTC2h 0m
2026-05-22 NSZ51M ARN → LGW May 22, 06:50 UTCMay 22, 09:05 UTC2h 15m
2026-05-21 NSZ4256 BCN → ARN May 21, 20:00 UTCMay 21, 23:05 UTC3h 5m

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

Mode-S 4ACA84 frequently asked

What is Mode-S code 4ACA84?
4ACA84 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTD.
Where is Mode-S 4ACA84 registered?
Mode-S code 4ACA84 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA84 broadcasting right now?
Yes. Mode-S 4ACA84 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA84, octal 22545204, decimal 4,901,508.
What flights does 4ACA84 operate?
Mode-S 4ACA84 has broadcast 20 distinct callsigns, including NSZ83AH, NSZ4AW, NSZ2941, NSZ2913, NSZ9WP.