Apparatus

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sensors Mode-S transponder

4ACA88

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTH · BOEING 737 MAX 8

Hex
4ACA88
Octal
22545210
Decimal
4,901,512
Country
SE
Tail
SE-RTH
Type
B38M
Broadcasting now · callsign NSZ2891 · 36,000 ft
Flights observed
233
Distinct callsigns
20
Country
SE
Last broadcast
2h ago

Current position

4ACA88 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 4ACA88 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
NSZ6HT Norwegian Air Sweden AOC 8 2026-05-11
NSZ2614 Norwegian Air Sweden AOC 6 2026-05-23
NSZ5NE Norwegian Air Sweden AOC 5 2026-05-28
NSZ56J Norwegian Air Sweden AOC 5 2026-05-28
NSZ2617 Norwegian Air Sweden AOC 5 2026-05-24
NSZ2615 Norwegian Air Sweden AOC 5 2026-05-23
NSZ23Y Norwegian Air Sweden AOC 5 2026-05-25
NSZ6RD Norwegian Air Sweden AOC 4 2026-05-26
NSZ2901 Norwegian Air Sweden AOC 4 2026-05-22
NSZ2900 Norwegian Air Sweden AOC 4 2026-05-22
NSZ2887 Norwegian Air Sweden AOC 4 2026-05-11
NSZ2767 Norwegian Air Sweden AOC 4 2026-05-11
NSZ2766 Norwegian Air Sweden AOC 4 2026-05-11
NSZ2616 Norwegian Air Sweden AOC 4 2026-05-24
NSZ2602 Norwegian Air Sweden AOC 4 2026-05-25
NSZ83AH Norwegian Air Sweden AOC 3 2026-04-17
NSZ4AW Norwegian Air Sweden AOC 3 2026-04-17
NSZ2845 Norwegian Air Sweden AOC 3 2026-05-25
NSZ2771 Norwegian Air Sweden AOC 3 2026-05-10
NSZ2770 Norwegian Air Sweden AOC 3 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 NSZ2890 HEL → PMI May 30, 03:15 UTCMay 30, 06:50 UTC3h 35m
2026-05-29 NSZ2847 SPU → HEL May 29, 18:30 UTCMay 29, 21:10 UTC2h 40m
2026-05-29 NSZ2846 HEL → SPU May 29, 14:45 UTCMay 29, 17:00 UTC2h 15m
2026-05-29 NSZ2613 ARN → HEL May 29, 13:00 UTCMay 29, 13:40 UTC40m
2026-05-29 NSZ4010 UME → ARN May 29, 11:25 UTCMay 29, 12:00 UTC35m
2026-05-29 NSZ4009 ARN → UME May 29, 10:00 UTCMay 29, 10:35 UTC35m
2026-05-29 NSZ8GH UME → ARN May 29, 08:20 UTCMay 29, 09:00 UTC40m
2026-05-29 NSZ5B ARN → UME May 29, 06:40 UTCMay 29, 07:15 UTC35m
2026-05-29 NSZ2EF UME → ARN May 29, 04:50 UTCMay 29, 05:30 UTC40m
2026-05-28 NSZ1KM ARN → UME May 28, 19:45 UTCMay 28, 20:20 UTC35m
2026-05-28 NSZ16Z UME → ARN May 28, 18:05 UTCMay 28, 18:45 UTC40m
2026-05-28 NSZ13R ARN → UME May 28, 16:25 UTCMay 28, 17:05 UTC40m
2026-05-28 NSZ12U UME → ARN May 28, 14:55 UTCMay 28, 15:35 UTC40m
2026-05-28 NSZ11N ARN → UME May 28, 13:10 UTCMay 28, 13:45 UTC35m
2026-05-28 NSZ56J FCO → ARN May 28, 09:25 UTCMay 28, 12:15 UTC2h 50m
2026-05-28 NSZ5NE ARN → FCO May 28, 05:10 UTCMay 28, 07:35 UTC2h 25m
2026-05-27 NSZ4378 MXP → ARN May 27, 18:55 UTCMay 27, 21:20 UTC2h 25m
2026-05-27 NSZ4377 ARN → MXP May 27, 15:25 UTCMay 27, 17:40 UTC2h 15m
2026-05-27 NSZ4280 OPO → ARN May 27, 09:45 UTCMay 27, 13:20 UTC3h 35m
2026-05-27 NSZ4279 ARN → OPO May 27, 04:55 UTCMay 27, 08:35 UTC3h 41m
2026-05-26 NSZ4527 ARN → RAK May 26, 13:29 UTCMay 26, 23:54 UTC10h 25m
2026-05-26 NSZ2621 PRG → ARN May 26, 10:20 UTCMay 26, 12:00 UTC1h 40m
2026-05-26 NSZ2620 ARN → PRG May 26, 07:40 UTCMay 26, 09:15 UTC1h 35m
2026-05-26 NSZ6RD HEL → ARN May 26, 05:40 UTCMay 26, 06:25 UTC45m
2026-05-25 NSZ2805 NCE → HEL May 25, 19:30 UTCMay 25, 22:30 UTC3h 0m
2026-05-25 NSZ2804 HEL → NCE May 25, 15:15 UTCMay 25, 18:20 UTC3h 5m
2026-05-25 NSZ2845 SPU → HEL May 25, 11:30 UTCMay 25, 14:15 UTC2h 45m
2026-05-25 NSZ2844 HEL → SPU May 25, 07:30 UTCMay 25, 09:45 UTC2h 15m
2026-05-25 NSZ23Y ARN → HEL May 25, 05:45 UTCMay 25, 06:25 UTC40m
2026-05-25 NSZ2602 HEL → ARN May 25, 04:10 UTCMay 25, 05:00 UTC50m
2026-05-24 NSZ1GT ARN → HEL May 24, 20:10 UTCMay 24, 20:55 UTC45m
2026-05-24 NSZ2FU HEL → ARN May 24, 18:45 UTCMay 24, 19:25 UTC40m
2026-05-24 NSZ2617 ARN → HEL May 24, 17:15 UTCMay 24, 17:55 UTC40m
2026-05-24 NSZ2616 HEL → ARN May 24, 15:20 UTCMay 24, 16:05 UTC45m
2026-05-24 NSZ7RP RVN → HEL May 24, 13:25 UTCMay 24, 14:15 UTC50m
2026-05-24 NSZ6YA HEL → RVN May 24, 11:30 UTCMay 24, 12:15 UTC45m
2026-05-24 NSZ2845 SPU → HEL May 24, 07:30 UTCMay 24, 10:15 UTC2h 45m
2026-05-23 NSZ2953 CHQ → HEL May 23, 21:55 UTCMay 24, 01:40 UTC3h 45m
2026-05-23 NSZ2952 HEL → CHQ May 23, 16:30 UTCMay 23, 19:45 UTC3h 15m
2026-05-23 NSZ2615 ARN → HEL May 23, 14:45 UTCMay 23, 15:25 UTC40m
2026-05-23 NSZ2614 HEL → ARN May 23, 13:15 UTCMay 23, 14:00 UTC45m
2026-05-23 NSZ2891 PMI → HEL May 23, 08:40 UTCMay 23, 12:25 UTC3h 45m
2026-05-23 NSZ2890 HEL → PMI May 23, 03:10 UTCMay 23, 06:50 UTC3h 40m
2026-05-22 NSZ1GT ARN → HEL May 22, 18:45 UTCMay 22, 19:30 UTC45m
2026-05-22 NSZ2FU HEL → ARN May 22, 17:05 UTCMay 22, 17:50 UTC45m
2026-05-22 NSZ2901 BCN → HEL May 22, 12:30 UTCMay 22, 16:10 UTC3h 40m
2026-05-22 NSZ2900 HEL → BCN May 22, 07:30 UTCMay 22, 11:00 UTC3h 30m
2026-05-22 NSZ23Y ARN → HEL May 22, 05:45 UTCMay 22, 06:25 UTC40m
2026-05-22 NSZ2602 HEL → ARN May 22, 04:10 UTCMay 22, 04:50 UTC40m
2026-05-21 NSZ2529 RVN → HEL May 21, 18:10 UTCMay 21, 19:05 UTC55m

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

Mode-S 4ACA88 frequently asked

What is Mode-S code 4ACA88?
4ACA88 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTH.
Where is Mode-S 4ACA88 registered?
Mode-S code 4ACA88 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA88 broadcasting right now?
Yes. Mode-S 4ACA88 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA88, octal 22545210, decimal 4,901,512.
What flights does 4ACA88 operate?
Mode-S 4ACA88 has broadcast 20 distinct callsigns, including NSZ6HT, NSZ2614, NSZ5NE, NSZ56J, NSZ2617.