Apparatus

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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
Transponder active on ground
Flights observed
561
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 21:35 UTC

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
NSZ3502 Norwegian Air Sweden AOC 13 2026-07-22
NSZ6PY - 10 2026-07-11
NSZ4KP Norwegian Air Sweden AOC 10 2026-07-22
NSZ3646 Norwegian Air Sweden AOC 10 2026-07-22
NSZ1KS - 10 2026-07-11
NSZ3521 - 9 2026-07-09
NSZ3510 - 9 2026-07-10
NSZ3503 - 8 2026-06-19
NSZ3206 Norwegian Air Sweden AOC 8 2026-07-23
NSZ9GY - 7 2026-06-16
NSZ8FI - 7 2026-06-16
NSZ5TP - 7 2026-07-10
NSZ3516 - 7 2026-07-09
NSZ3391 Norwegian Air Sweden AOC 7 2026-07-25
NSZ3390 Norwegian Air Sweden AOC 7 2026-07-25
NSZ7WJ Norwegian Air Sweden AOC 6 2026-06-28
NSZ3616 - 6 2026-06-28
NSZ3303 - 6 2026-06-16
NSZ3302 Norwegian Air Sweden AOC 6 2026-06-16
NSZ3211 Norwegian Air Sweden AOC 6 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ3213 ARN → CPH Jul 26, 20:30 UTCJul 26, 21:30 UTC1h 0m
2026-07-26 NSZ3212 CPH → ARN Jul 26, 18:40 UTCJul 26, 19:30 UTC50m
2026-07-26 NSZ3153 HEL → CPH Jul 26, 16:20 UTCJul 26, 17:40 UTC1h 20m
2026-07-26 NSZ3152 CPH → HEL Jul 26, 14:20 UTCJul 26, 15:35 UTC1h 15m
2026-07-26 NSZ3225 CPH → OSL Jul 26, 12:35 UTCJul 26, 13:20 UTC45m
2026-07-26 NSZ3224 CPH → OSL Jul 26, 10:45 UTCJul 26, 11:40 UTC55m
2026-07-26 NSZ3629 MPL → CPH Jul 26, 07:50 UTCJul 26, 09:50 UTC2h 0m
2026-07-26 NSZ3628 CPH → MPL Jul 26, 04:40 UTCJul 26, 06:50 UTC2h 11m
2026-07-25 NSZ3799 TBS → CPH Jul 25, 19:40 UTCJul 25, 23:55 UTC4h 15m
2026-07-25 NSZ3798 CPH → TBS Jul 25, 18:05 UTCJul 25, 18:20 UTC15m
2026-07-25 NSZ3798 CPH → TBS Jul 25, 14:35 UTCJul 25, 17:05 UTC2h 30m
2026-07-25 NSZ3391 LCA → CPH Jul 25, 09:40 UTCJul 25, 13:25 UTC3h 45m
2026-07-25 NSZ3390 CPH → LCA Jul 25, 04:55 UTCJul 25, 08:20 UTC3h 25m
2026-07-24 NSZ3369 RHO → CPH Jul 24, 23:00 UTCJul 25, 02:30 UTC3h 30m
2026-07-24 NSZ3368 CPH → RHO Jul 24, 19:00 UTCJul 24, 22:00 UTC3h 0m
2026-07-24 NSZ3231 OSL → CPH Jul 24, 17:10 UTCJul 24, 18:00 UTC50m
2026-07-24 NSZ3230 CPH → OSL Jul 24, 15:20 UTCJul 24, 16:15 UTC55m
2026-07-24 NSZ3227 OSL → CPH Jul 24, 13:35 UTCJul 24, 14:25 UTC50m
2026-07-24 NSZ3226 CPH → OSL Jul 24, 11:40 UTCJul 24, 12:35 UTC55m
2026-07-24 NSZ3641 NCE → CPH Jul 24, 08:05 UTCJul 24, 10:15 UTC2h 10m
2026-07-24 NSZ3640 CPH → NCE Jul 24, 04:55 UTCJul 24, 06:45 UTC1h 50m
2026-07-23 NSZ3631 BSL → CPH Jul 23, 19:35 UTCJul 23, 21:05 UTC1h 30m
2026-07-23 NSZ3630 CPH → BSL Jul 23, 17:05 UTCJul 23, 18:30 UTC1h 25m
2026-07-23 NSZ3211 ARN → CPH Jul 23, 15:25 UTCJul 23, 16:15 UTC50m
2026-07-23 NSZ3206 CPH → ARN Jul 23, 13:35 UTCJul 23, 14:30 UTC55m
2026-07-23 NSZ3613 OPO → CPH Jul 23, 09:30 UTCJul 23, 12:35 UTC3h 5m
2026-07-23 NSZ2EM CPH → CPH Jul 23, 05:25 UTCJul 23, 08:20 UTC2h 55m
2026-07-22 NSZ4KP NCE → CPH Jul 22, 20:10 UTCJul 22, 22:05 UTC1h 55m
2026-07-22 NSZ3646 CPH → NCE Jul 22, 16:55 UTCJul 22, 18:55 UTC2h 0m
2026-07-22 NSZ50TE EDI → CPH Jul 22, 14:20 UTCJul 22, 15:50 UTC1h 30m
2026-07-22 NSZ3502 CPH → EDI Jul 22, 11:45 UTCJul 22, 13:25 UTC1h 40m
2026-07-22 NSZ3407 RAK → CPH Jul 22, 00:15 UTCJul 22, 04:10 UTC3h 55m
2026-07-21 NSZ3406 CPH → RAK Jul 21, 19:00 UTCJul 21, 22:55 UTC3h 55m
2026-07-21 NSZ5074 AGP → CPH Jul 21, 14:30 UTCJul 21, 17:40 UTC3h 10m
2026-07-21 NSZ5021 OSL → AGP Jul 21, 09:50 UTCJul 21, 13:20 UTC3h 30m
2026-07-21 NSZ2JM AGP → OSL Jul 21, 05:00 UTCJul 21, 08:45 UTC3h 45m
2026-07-20 NSZ5023 OSL → AGP Jul 20, 17:45 UTCJul 20, 21:15 UTC3h 30m
2026-07-20 NSZ2TU - Jul 20, 13:15 UTCJul 20, 16:45 UTC3h 30m
2026-07-20 NSZ5085 BLL → AGP Jul 20, 08:50 UTCJul 20, 11:55 UTC3h 5m
2026-07-20 NSZ80W AGP → BLL Jul 20, 04:45 UTCJul 20, 07:50 UTC3h 5m
2026-07-19 NSZ5023 - Jul 19, 17:30 UTCJul 19, 21:05 UTC3h 35m
2026-07-19 NOZ5JA EDI → OSL Jul 19, 14:55 UTCJul 19, 16:25 UTC1h 30m
2026-07-19 NOZ3UF OSL → EDI Jul 19, 12:30 UTCJul 19, 13:55 UTC1h 25m
2026-07-19 NOZ3LB GVA → OSL Jul 19, 08:55 UTCJul 19, 11:05 UTC2h 10m
2026-07-19 NOZ62H OSL → GVA Jul 19, 05:35 UTCJul 19, 07:40 UTC2h 5m
2026-07-18 NOZ6RE ATH → OSL Jul 18, 19:05 UTCJul 18, 22:35 UTC3h 30m
2026-07-18 NOZ4TW OSL → ATH Jul 18, 14:35 UTCJul 18, 18:00 UTC3h 25m
2026-07-18 NOZ1261 - Jul 18, 09:35 UTCJul 18, 13:30 UTC3h 55m
2026-07-18 NOZ1260 OSL → AYT Jul 18, 04:35 UTCJul 18, 08:20 UTC3h 45m
2026-07-17 NSZ2TU - Jul 17, 13:45 UTCJul 17, 17:09 UTC3h 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-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?
Mode-S 4AB821 is currently broadcasting from the ground.
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 NSZ3502, NSZ6PY, NSZ4KP, NSZ3646, NSZ1KS.