Apparatus

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sensors Mode-S transponder

4ACA4A

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RRJ · BOEING 737-800

Hex
4ACA4A
Octal
22545112
Decimal
4,901,450
Country
SE
Tail
SE-RRJ
Type
B738
Broadcasting now · callsign NSZ2097 · 36,000 ft
Flights observed
605
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 21:15 UTC

Current position

4ACA4A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA4A 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
NSZ2063 - 13 2026-07-10
NSZ2062 - 13 2026-07-10
NSZ2003 - 13 2026-07-10
NSZ2002 - 12 2026-07-10
NSZ2067 - 11 2026-07-10
NSZ2066 - 11 2026-07-10
NSZ2011 - 11 2026-07-10
NSZ2010 - 11 2026-07-10
NSZ2030 - 9 2026-07-11
NSZ60X - 8 2026-07-19
NSZ59T Norwegian Air Sweden AOC 8 2026-07-19
NSZ3YT - 8 2026-07-17
NSZ2MP - 8 2026-07-17
NSZ2031 - 8 2026-07-07
NSZ75Z Norwegian Air Sweden AOC 7 2026-05-26
NSZ6MJ Norwegian Air Sweden AOC 7 2026-05-26
NSZ4506 Norwegian Air Sweden AOC 7 2026-07-20
NSZ44L - 7 2026-06-25
NSZ43E - 7 2026-06-25
NSZ38K Norwegian Air Sweden AOC 7 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ18X UME → ARN Jul 26, 20:30 UTCJul 26, 21:10 UTC40m
2026-07-26 NSZ15Y ARN → UME Jul 26, 19:00 UTCJul 26, 19:35 UTC35m
2026-07-26 NSZ48U BUD → ARN Jul 26, 16:10 UTCJul 26, 18:00 UTC1h 50m
2026-07-26 NSZ87C ARN → BUD Jul 26, 13:10 UTCJul 26, 15:10 UTC2h 0m
2026-07-26 NSZ4364 PMO → ARN Jul 26, 09:20 UTCJul 26, 12:15 UTC2h 55m
2026-07-26 NSZ4363 ARN → PMO Jul 26, 04:20 UTCJul 26, 07:35 UTC3h 16m
2026-07-25 NSZ4528 RAK → ARN Jul 25, 19:40 UTCJul 25, 23:50 UTC4h 10m
2026-07-25 NSZ4527 ARN → RAK Jul 25, 13:25 UTCJul 25, 17:50 UTC4h 25m
2026-07-25 NSZ4318 MPL → ARN Jul 25, 08:50 UTCJul 25, 11:25 UTC2h 35m
2026-07-25 NSZ4317 ARN → MPL Jul 25, 05:00 UTCJul 25, 07:55 UTC2h 55m
2026-07-24 NSZ4DW DBV → ARN Jul 24, 19:45 UTCJul 24, 22:35 UTC2h 50m
2026-07-24 NSZ3AQ ARN → DBV Jul 24, 16:15 UTCJul 24, 18:40 UTC2h 25m
2026-07-24 NSZ4514 HAM → ARN Jul 24, 13:55 UTCJul 24, 15:10 UTC1h 15m
2026-07-24 NSZ4513 ARN → HAM Jul 24, 11:45 UTCJul 24, 12:55 UTC1h 10m
2026-07-24 NSZ4316 BSL → ARN Jul 24, 08:35 UTCJul 24, 10:45 UTC2h 10m
2026-07-24 NSZ4315 ARN → BSL Jul 24, 05:20 UTCJul 24, 07:20 UTC2h 0m
2026-07-23 NSZ4370 PSA → ARN Jul 23, 19:35 UTCJul 23, 22:25 UTC2h 50m
2026-07-23 NSZ4369 ARN → PSA Jul 23, 16:00 UTCJul 23, 18:10 UTC2h 10m
2026-07-23 NSZ2CP AGP → ARN Jul 23, 10:50 UTCJul 23, 14:55 UTC4h 5m
2026-07-23 NSZ21U ARN → AGP Jul 23, 05:25 UTCJul 23, 09:20 UTC3h 55m
2026-07-22 NSZ4378 MXP → ARN Jul 22, 19:00 UTCJul 22, 21:20 UTC2h 20m
2026-07-22 NSZ4377 ARN → MXP Jul 22, 15:40 UTCJul 22, 17:55 UTC2h 15m
2026-07-22 NSZ4514 HAM → ARN Jul 22, 13:25 UTCJul 22, 14:35 UTC1h 10m
2026-07-22 NSZ4513 ARN → HAM Jul 22, 11:15 UTCJul 22, 12:05 UTC50m
2026-07-21 NSZ4402 LCA → ARN Jul 21, 18:25 UTCJul 21, 22:45 UTC4h 20m
2026-07-21 NSZ4401 ARN → LCA Jul 21, 13:25 UTCJul 21, 17:20 UTC3h 55m
2026-07-21 NSZ56J - Jul 21, 09:20 UTCJul 21, 11:55 UTC2h 35m
2026-07-21 NSZ5NE ARN → FCO Jul 21, 05:45 UTCJul 21, 07:50 UTC2h 5m
2026-07-21 NSZ5NE ARN → FCO Jul 21, 05:05 UTCJul 21, 05:40 UTC35m
2026-07-20 NSZ24N NCE → ARN Jul 20, 19:30 UTCJul 20, 22:10 UTC2h 40m
2026-07-20 NSZ3YL ARN → NCE Jul 20, 15:45 UTCJul 20, 18:20 UTC2h 35m
2026-07-20 NSZ48U BUD → ARN Jul 20, 12:55 UTCJul 20, 14:50 UTC1h 55m
2026-07-20 NSZ87C ARN → BUD Jul 20, 10:10 UTCJul 20, 12:05 UTC1h 55m
2026-07-20 NSZ4506 BER → ARN Jul 20, 07:40 UTCJul 20, 08:55 UTC1h 15m
2026-07-20 NSZ4505 ARN → BER Jul 20, 05:00 UTCJul 20, 06:20 UTC1h 20m
2026-07-19 NSZ60X LGW → ARN Jul 19, 19:50 UTCJul 19, 21:50 UTC2h 0m
2026-07-19 NSZ59T ARN → LGW Jul 19, 16:00 UTCJul 19, 18:20 UTC2h 20m
2026-07-19 NSZ4506 BER → ARN Jul 19, 13:40 UTCJul 19, 14:45 UTC1h 5m
2026-07-19 NSZ4505 ARN → BER Jul 19, 11:15 UTCJul 19, 12:30 UTC1h 15m
2026-07-19 NSZ4546 OTP → ARN Jul 19, 07:50 UTCJul 19, 10:15 UTC2h 25m
2026-07-19 NSZ4545 ARN → OTP Jul 19, 04:25 UTCJul 19, 06:50 UTC2h 25m
2026-07-18 NSZ4352 PRN → ARN Jul 18, 20:45 UTCJul 18, 23:55 UTC3h 10m
2026-07-18 NSZ4351 ARN → PRN Jul 18, 15:55 UTCJul 18, 18:55 UTC3h 0m
2026-07-18 NSZ2CP - Jul 18, 10:45 UTCJul 18, 14:35 UTC3h 50m
2026-07-18 NSZ21U - Jul 18, 05:30 UTCJul 18, 09:40 UTC4h 10m
2026-07-17 NSZ4376 BRI → ARN Jul 17, 20:10 UTCJul 17, 22:45 UTC2h 35m
2026-07-17 NSZ4375 ARN → BRI Jul 17, 16:15 UTCJul 17, 19:09 UTC2h 55m
2026-07-17 NSZ14V - Jul 17, 14:24 UTCJul 17, 15:05 UTC40m
2026-07-17 NSZ13R - Jul 17, 13:00 UTCJul 17, 13:35 UTC35m
2026-07-17 NSZ2MP NCE → ARN Jul 17, 09:30 UTCJul 17, 11:55 UTC2h 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-RRJ page for operator, model, and routing details .

Mode-S 4ACA4A frequently asked

What is Mode-S code 4ACA4A?
4ACA4A is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RRJ.
Where is Mode-S 4ACA4A registered?
Mode-S code 4ACA4A is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA4A broadcasting right now?
Yes. Mode-S 4ACA4A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA4A, octal 22545112, decimal 4,901,450.
What flights does 4ACA4A operate?
Mode-S 4ACA4A has broadcast 20 distinct callsigns, including NSZ2063, NSZ2062, NSZ2003, NSZ2002, NSZ2067.