Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4AB821

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-NAA · BOEING 737 MAX 8

Hex
4AB821
Octal
22534041
Decimal
4,896,801
Country
SE
Tail
SE-NAA
Type
B38M
No current signal · last broadcast 7h ago
Flights observed
267
Distinct callsigns
20
Country
SE
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S 4AB821.

Country allocation

The ICAO 24-bit address 4AB821 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
NSZ3521 Norwegian Air Sweden AOC 6 2026-05-18
NSZ3510 Norwegian Air Sweden AOC 6 2026-05-14
NSZ3503 Norwegian Air Sweden AOC 6 2026-05-14
NSZ3502 Norwegian Air Sweden AOC 6 2026-05-14
NSZ6PY Norwegian Air Sweden AOC 5 2026-05-20
NSZ3391 Norwegian Air Sweden AOC 5 2026-05-26
NSZ3390 Norwegian Air Sweden AOC 5 2026-05-26
NSZ3207 Norwegian Air Sweden AOC 5 2026-05-24
NSZ3206 Norwegian Air Sweden AOC 5 2026-05-24
NSZ1KS Norwegian Air Sweden AOC 5 2026-05-20
NSZ9GY Norwegian Air Sweden AOC 4 2026-05-26
NSZ8FI Norwegian Air Sweden AOC 4 2026-05-26
NSZ7WJ Norwegian Air Sweden AOC 4 2026-05-24
NSZ5TP Norwegian Air Sweden AOC 4 2026-05-14
NSZ5KA Norwegian Air Sweden AOC 4 2026-05-25
NSZ55YN Norwegian Air Sweden AOC 4 2026-05-25
NSZ4KP Norwegian Air Sweden AOC 4 2026-05-14
NSZ3646 Norwegian Air Sweden AOC 4 2026-05-14
NSZ3616 Norwegian Air Sweden AOC 4 2026-05-24
NSZ3519 Norwegian Air Sweden AOC 4 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 NSZ3613 OPO → CPH May 29, 19:10 UTCMay 29, 21:50 UTC2h 40m
2026-05-29 NSZ2EM CPH → CPH May 29, 15:00 UTCMay 29, 18:15 UTC3h 15m
2026-05-29 NSZ365L BCN → CPH May 29, 11:00 UTCMay 29, 13:45 UTC2h 45m
2026-05-29 NSZ56V CPH → BCN May 29, 07:15 UTCMay 29, 09:40 UTC2h 25m
2026-05-29 NSZ81E AAL → CPH May 29, 05:40 UTCMay 29, 06:10 UTC30m
2026-05-28 NSZ3086 CPH → AAL May 28, 18:45 UTCMay 28, 19:15 UTC30m
2026-05-28 NSZ3525 LGW → CPH May 28, 16:30 UTCMay 28, 17:55 UTC1h 25m
2026-05-28 NSZ3524 CPH → LGW May 28, 13:40 UTCMay 28, 15:30 UTC1h 50m
2026-05-28 NSZ3613 OPO → CPH May 28, 09:20 UTCMay 28, 12:15 UTC2h 55m
2026-05-28 NSZ2EM CPH → CPH May 28, 05:10 UTCMay 28, 08:15 UTC3h 5m
2026-05-27 NSZ3525 LGW → CPH May 27, 16:25 UTCMay 27, 17:45 UTC1h 20m
2026-05-27 NSZ3524 CPH → LGW May 27, 13:35 UTCMay 27, 15:15 UTC1h 40m
2026-05-27 NSZ3225 CPH → OSL May 27, 10:35 UTCMay 27, 11:30 UTC55m
2026-05-27 NSZ3224 CPH → OSL May 27, 09:00 UTCMay 27, 09:55 UTC55m
2026-05-27 NSZ3221 OSL → CPH May 27, 07:05 UTCMay 27, 07:50 UTC45m
2026-05-27 NSZ3220 CPH → OSL May 27, 05:19 UTCMay 27, 06:15 UTC55m
2026-05-26 NSZ9GY CDG → CPH May 26, 20:24 UTCMay 26, 21:40 UTC1h 15m
2026-05-26 NSZ8FI CPH → CDG May 26, 17:35 UTCMay 26, 19:10 UTC1h 35m
2026-05-26 NSZ3303 BER → CPH May 26, 16:00 UTCMay 26, 16:40 UTC40m
2026-05-26 NSZ3302 CPH → BER May 26, 14:30 UTCMay 26, 15:05 UTC35m
2026-05-26 NSZ3391 LCA → CPH May 26, 09:04 UTCMay 26, 13:00 UTC3h 55m
2026-05-26 NSZ3390 CPH → LCA May 26, 04:15 UTCMay 26, 07:40 UTC3h 25m
2026-05-25 NSZ3519 LGW → CPH May 25, 18:25 UTCMay 25, 19:44 UTC1h 20m
2026-05-25 NSZ3518 CPH → LGW May 25, 15:45 UTCMay 25, 17:20 UTC1h 35m
2026-05-25 NSZ5KA BUD → CPH May 25, 13:00 UTCMay 25, 14:35 UTC1h 35m
2026-05-25 NSZ55YN CPH → BUD May 25, 10:50 UTCMay 25, 12:15 UTC1h 25m
2026-05-25 NSZ3529 NCL → CPH May 25, 07:55 UTCMay 25, 09:10 UTC1h 15m
2026-05-25 NSZ3528 CPH → NCL May 25, 05:30 UTCMay 25, 06:55 UTC1h 25m
2026-05-24 NSZ3211 ARN → CPH May 24, 19:15 UTCMay 24, 20:10 UTC55m
2026-05-24 NSZ3210 CPH → ARN May 24, 17:20 UTCMay 24, 18:25 UTC1h 5m
2026-05-24 NSZ3207 ARN → CPH May 24, 15:40 UTCMay 24, 16:35 UTC55m
2026-05-24 NSZ3206 CPH → ARN May 24, 14:00 UTCMay 24, 14:55 UTC55m
2026-05-24 NSZ7WJ LIS → CPH May 24, 09:55 UTCMay 24, 13:05 UTC3h 10m
2026-05-24 NSZ3616 CPH → LIS May 24, 05:05 UTCMay 24, 08:35 UTC3h 30m
2026-05-23 NSZ3667 PMI → CPH May 23, 19:05 UTCMay 23, 21:45 UTC2h 40m
2026-05-23 NSZ74Q CPH → PMI May 23, 15:25 UTCMay 23, 17:50 UTC2h 25m
2026-05-23 NSZ365L BCN → CPH May 23, 11:10 UTCMay 23, 13:40 UTC2h 30m
2026-05-23 NSZ56V CPH → BCN May 23, 07:15 UTCMay 23, 09:45 UTC2h 30m
2026-05-23 NSZ81E AAL → CPH May 23, 05:05 UTCMay 23, 05:35 UTC30m
2026-05-22 NSZ8WM CPH → AAL May 22, 20:10 UTCMay 22, 20:40 UTC30m
2026-05-22 NSZ8531 ARN → LCA May 22, 18:20 UTCMay 22, 19:10 UTC50m
2026-05-22 NSZ4052 SFT → ARN May 22, 16:45 UTCMay 22, 17:35 UTC50m
2026-05-22 NSZ4051 SFT → ARN May 22, 15:05 UTCMay 22, 16:00 UTC55m
2026-05-22 NSZ8530 ARN → CPH May 22, 13:25 UTCMay 22, 14:25 UTC1h 0m
2026-05-22 NSZ6EZ VLC → CPH May 22, 09:35 UTCMay 22, 12:30 UTC2h 55m
2026-05-22 NSZ3654 CPH → VLC May 22, 05:45 UTCMay 22, 08:35 UTC2h 50m
2026-05-21 NSZ3667 PMI → CPH May 21, 18:35 UTCMay 21, 21:15 UTC2h 40m
2026-05-21 NSZ74Q CPH → PMI May 21, 14:35 UTCMay 21, 17:05 UTC2h 30m
2026-05-21 NSZ7WJ LIS → CPH May 21, 10:15 UTCMay 21, 13:15 UTC3h 0m
2026-05-21 NSZ3616 CPH → LIS May 21, 05:25 UTCMay 21, 08:45 UTC3h 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-NAA page for operator, model, and routing details .

Mode-S 4AB821 frequently asked

What is Mode-S code 4AB821?
4AB821 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-NAA.
Where is Mode-S 4AB821 registered?
Mode-S code 4AB821 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AB821 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AB821, octal 22534041, decimal 4,896,801.
What flights does 4AB821 operate?
Mode-S 4AB821 has broadcast 20 distinct callsigns, including NSZ3521, NSZ3510, NSZ3503, NSZ3502, NSZ6PY.