Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4ACA8A

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTJ · BOEING 737 MAX 8

Hex
4ACA8A
Octal
22545212
Decimal
4,901,514
Country
SE
Tail
SE-RTJ
Type
B38M
No current signal · last broadcast 1h ago
Flights observed
221
Distinct callsigns
20
Country
SE
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 4ACA8A.

Country allocation

The ICAO 24-bit address 4ACA8A 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
NSZ2621 Norwegian Air Sweden AOC 5 2026-06-04
NSZ2620 Norwegian Air Sweden AOC 5 2026-06-04
NSZ83AH Norwegian Air Sweden AOC 4 2026-05-29
NSZ4AW Norwegian Air Sweden AOC 4 2026-05-29
NSZ4110 Norwegian Air Sweden AOC 4 2026-06-05
NSZ2845 Norwegian Air Sweden AOC 4 2026-06-07
NSZ2844 Norwegian Air Sweden AOC 4 2026-06-07
NSZ2602 Norwegian Air Sweden AOC 4 2026-06-01
NSZ23Y Norwegian Air Sweden AOC 4 2026-06-01
NSZ8YC Norwegian Air Sweden AOC 3 2026-05-31
NSZ6RD Norwegian Air Sweden AOC 3 2026-06-04
NSZ6HT Norwegian Air Sweden AOC 3 2026-05-31
NSZ4109 Norwegian Air Sweden AOC 3 2026-06-05
NSZ2953 Norwegian Air Sweden AOC 3 2026-06-06
NSZ2952 Norwegian Air Sweden AOC 3 2026-06-06
NSZ2941 Norwegian Air Sweden AOC 3 2026-05-24
NSZ2887 Norwegian Air Sweden AOC 3 2026-05-31
NSZ2617 Norwegian Air Sweden AOC 3 2026-06-07
NSZ2616 Norwegian Air Sweden AOC 3 2026-06-07
NSZ2615 Norwegian Air Sweden AOC 3 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-07 NSZ1GT ARN → HEL Jun 7, 20:00 UTCJun 7, 20:40 UTC40m
2026-06-07 NSZ2FU HEL → ARN Jun 7, 18:20 UTCJun 7, 19:00 UTC40m
2026-06-07 NSZ2617 ARN → HEL Jun 7, 17:00 UTCJun 7, 17:40 UTC40m
2026-06-07 NSZ2616 HEL → ARN Jun 7, 15:15 UTCJun 7, 16:00 UTC45m
2026-06-07 NSZ7RP RVN → HEL Jun 7, 13:25 UTCJun 7, 14:20 UTC55m
2026-06-07 NSZ6YA HEL → RVN Jun 7, 11:25 UTCJun 7, 12:10 UTC45m
2026-06-07 NSZ2845 SPU → HEL Jun 7, 07:40 UTCJun 7, 10:10 UTC2h 30m
2026-06-07 NSZ2844 HEL → SPU Jun 7, 03:50 UTCJun 7, 06:20 UTC2h 30m
2026-06-06 NSZ2953 CHQ → HEL Jun 6, 21:04 UTCJun 7, 00:44 UTC3h 40m
2026-06-06 NSZ2952 HEL → CHQ Jun 6, 16:14 UTCJun 6, 19:40 UTC3h 25m
2026-06-06 NSZ2615 ARN → HEL Jun 6, 13:49 UTCJun 6, 14:34 UTC45m
2026-06-06 NSZ4318 MPL → ARN Jun 6, 08:45 UTCJun 6, 11:19 UTC2h 35m
2026-06-06 NSZ4317 ARN → MPL Jun 6, 04:55 UTCJun 6, 07:50 UTC2h 55m
2026-06-05 NSZ4330 LYS → ARN Jun 5, 19:55 UTCJun 5, 22:20 UTC2h 25m
2026-06-05 NSZ4329 ARN → LYS Jun 5, 16:35 UTCJun 5, 19:05 UTC2h 30m
2026-06-05 NSZ4110 OSL → ARN Jun 5, 14:35 UTCJun 5, 15:25 UTC50m
2026-06-05 NSZ4109 ARN → OSL Jun 5, 13:05 UTCJun 5, 13:50 UTC45m
2026-06-05 NSZ56J FCO → ARN Jun 5, 09:40 UTCJun 5, 12:05 UTC2h 25m
2026-06-05 NSZ5NE ARN → FCO Jun 5, 05:15 UTCJun 5, 08:15 UTC3h 0m
2026-06-04 NSZ16Z UME → ARN Jun 4, 17:55 UTCJun 4, 18:35 UTC40m
2026-06-04 NSZ13R ARN → UME Jun 4, 16:30 UTCJun 4, 17:05 UTC35m
2026-06-04 NSZ12U UME → ARN Jun 4, 15:10 UTCJun 4, 15:50 UTC40m
2026-06-04 NSZ11N ARN → UME Jun 4, 13:35 UTCJun 4, 14:10 UTC35m
2026-06-04 NSZ2621 PRG → ARN Jun 4, 10:15 UTCJun 4, 11:45 UTC1h 30m
2026-06-04 NSZ2620 ARN → PRG Jun 4, 07:35 UTCJun 4, 09:10 UTC1h 35m
2026-06-04 NSZ6RD HEL → ARN Jun 4, 05:35 UTCJun 4, 06:20 UTC45m
2026-06-03 NSZ1GT ARN → HEL Jun 3, 20:00 UTCJun 3, 20:45 UTC45m
2026-06-03 NSZ2621 PRG → ARN Jun 3, 17:30 UTCJun 3, 19:00 UTC1h 30m
2026-06-03 NSZ2620 ARN → PRG Jun 3, 14:40 UTCJun 3, 16:20 UTC1h 40m
2026-06-03 NSZ2614 HEL → ARN Jun 3, 12:55 UTCJun 3, 13:40 UTC45m
2026-06-03 NSZ2767 LGW → HEL Jun 3, 09:10 UTCJun 3, 11:35 UTC2h 25m
2026-06-03 NSZ2766 HEL → LGW Jun 3, 05:20 UTCJun 3, 08:00 UTC2h 40m
2026-06-02 NSZ2831 TIA → HEL Jun 2, 20:20 UTCJun 2, 23:10 UTC2h 50m
2026-06-02 NSZ2830 HEL → TIA Jun 2, 16:35 UTCJun 2, 19:10 UTC2h 35m
2026-06-02 NSZ2615 ARN → HEL Jun 2, 14:50 UTCJun 2, 15:30 UTC40m
2026-06-02 NSZ2614 HEL → ARN Jun 2, 13:15 UTCJun 2, 14:00 UTC45m
2026-06-02 NSZ6FV ATH → HEL Jun 2, 08:50 UTCJun 2, 12:15 UTC3h 25m
2026-06-02 NSZ2962 HEL → ATH Jun 2, 04:00 UTCJun 2, 07:30 UTC3h 30m
2026-06-01 NSZ2805 NCE → HEL Jun 1, 19:35 UTCJun 1, 22:30 UTC2h 55m
2026-06-01 NSZ2804 HEL → NCE Jun 1, 14:55 UTCJun 1, 18:00 UTC3h 5m
2026-06-01 NSZ2845 SPU → HEL Jun 1, 11:10 UTCJun 1, 13:45 UTC2h 35m
2026-06-01 NSZ2844 HEL → SPU Jun 1, 07:20 UTCJun 1, 09:50 UTC2h 30m
2026-06-01 NSZ23Y ARN → HEL Jun 1, 05:50 UTCJun 1, 06:30 UTC40m
2026-06-01 NSZ2602 HEL → ARN Jun 1, 04:15 UTCJun 1, 04:55 UTC40m
2026-05-31 NSZ2887 AGP → HEL May 31, 18:30 UTCMay 31, 22:45 UTC4h 15m
2026-05-31 NSZ6HT HEL → AGP May 31, 13:00 UTCMay 31, 17:15 UTC4h 15m
2026-05-31 NSZ8YC NCE → HEL May 31, 09:05 UTCMay 31, 12:00 UTC2h 55m
2026-05-30 NSZ2831 TIA → HEL May 30, 19:00 UTCMay 30, 21:50 UTC2h 50m
2026-05-30 NSZ2830 HEL → TIA May 30, 14:35 UTCMay 30, 17:15 UTC2h 40m
2026-05-30 NSZ2887 AGP → HEL May 30, 08:35 UTCMay 30, 12:55 UTC4h 20m

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

Mode-S 4ACA8A frequently asked

What is Mode-S code 4ACA8A?
4ACA8A is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTJ.
Where is Mode-S 4ACA8A registered?
Mode-S code 4ACA8A is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA8A broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA8A, octal 22545212, decimal 4,901,514.
What flights does 4ACA8A operate?
Mode-S 4ACA8A has broadcast 20 distinct callsigns, including NSZ2621, NSZ2620, NSZ83AH, NSZ4AW, NSZ4110.