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
Broadcasting now · callsign NSZ90Y · 5,900 ft
Flights observed
501
Distinct callsigns
20
Country
SE
Last broadcast
6h ago

Current position

4AB821 is currently broadcasting. Map zoomed to live position.

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 - 12 2026-07-12
NSZ6PY - 10 2026-07-11
NSZ1KS - 10 2026-07-11
NSZ4KP - 9 2026-07-10
NSZ3646 - 9 2026-07-10
NSZ3521 - 9 2026-07-09
NSZ3510 - 9 2026-07-10
NSZ3503 - 8 2026-06-19
NSZ9GY - 7 2026-06-16
NSZ8FI - 7 2026-06-16
NSZ5TP - 7 2026-07-10
NSZ3516 - 7 2026-07-09
NSZ3206 Norwegian Air Sweden AOC 7 2026-06-29
NSZ7WJ Norwegian Air Sweden AOC 6 2026-06-28
NSZ3616 - 6 2026-06-28
NSZ3391 - 6 2026-07-04
NSZ3390 - 6 2026-07-04
NSZ3303 - 6 2026-06-16
NSZ3302 Norwegian Air Sweden AOC 6 2026-06-16
NSZ3207 - 6 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 NSZ5087 - Jul 14, 18:20 UTCJul 14, 21:50 UTC3h 30m
2026-07-14 NSZ5086 - Jul 14, 14:00 UTCJul 14, 17:05 UTC3h 5m
2026-07-14 NSZ5063 - Jul 14, 09:15 UTCJul 14, 12:55 UTC3h 40m
2026-07-14 NSZ5062 - Jul 14, 05:00 UTCJul 14, 08:15 UTC3h 15m
2026-07-13 NSZ5075 - Jul 13, 19:40 UTCJul 13, 23:00 UTC3h 20m
2026-07-13 NSZ3231 - Jul 13, 17:05 UTCJul 13, 17:55 UTC50m
2026-07-13 NSZ3230 CPH → OSL Jul 13, 15:20 UTCJul 13, 16:10 UTC50m
2026-07-13 NSZ5KA BUD → CPH Jul 13, 12:50 UTCJul 13, 14:20 UTC1h 30m
2026-07-13 NSZ3FZ CPH → BUD Jul 13, 10:25 UTCJul 13, 11:50 UTC1h 25m
2026-07-13 NSZ7VR - Jul 13, 07:20 UTCJul 13, 09:05 UTC1h 45m
2026-07-13 NSZ6UK CPH → PSA Jul 13, 04:25 UTCJul 13, 06:20 UTC1h 55m
2026-07-12 NSZ3667 - Jul 12, 19:25 UTCJul 12, 21:55 UTC2h 30m
2026-07-12 NSZ74Q - Jul 12, 15:25 UTCJul 12, 18:05 UTC2h 40m
2026-07-12 NSZ3MC LGW → CPH Jul 12, 12:55 UTCJul 12, 14:15 UTC1h 20m
2026-07-12 NSZ4EV CPH → LGW Jul 12, 10:15 UTCJul 12, 11:50 UTC1h 35m
2026-07-12 NSZ50TE - Jul 12, 07:35 UTCJul 12, 09:00 UTC1h 25m
2026-07-12 NSZ3502 CPH → EDI Jul 12, 05:10 UTCJul 12, 06:45 UTC1h 35m
2026-07-11 NSZ3353 CHQ → CPH Jul 11, 17:30 UTCJul 11, 20:45 UTC3h 15m
2026-07-11 NSZ3352 CPH → CHQ Jul 11, 13:20 UTCJul 11, 16:15 UTC2h 55m
2026-07-11 NSZ1KS - Jul 11, 09:10 UTCJul 11, 12:15 UTC3h 5m
2026-07-11 NSZ6PY - Jul 11, 04:30 UTCJul 11, 07:50 UTC3h 20m
2026-07-10 NSZ4KP - Jul 10, 20:05 UTCJul 10, 22:00 UTC1h 55m
2026-07-10 NSZ3646 CPH → NCE Jul 10, 17:10 UTCJul 10, 19:10 UTC2h 0m
2026-07-10 NSZ50TE - Jul 10, 14:35 UTCJul 10, 16:00 UTC1h 25m
2026-07-10 NSZ3502 CPH → EDI Jul 10, 11:50 UTCJul 10, 13:20 UTC1h 30m
2026-07-10 NSZ5TP LGW → CPH Jul 10, 09:30 UTCJul 10, 10:50 UTC1h 20m
2026-07-10 NSZ3510 CPH → LGW Jul 10, 06:20 UTCJul 10, 08:15 UTC1h 55m
2026-07-09 NSZ3521 LGW → CPH Jul 9, 20:00 UTCJul 9, 21:25 UTC1h 25m
2026-07-09 NSZ3543 - Jul 9, 17:15 UTCJul 9, 18:40 UTC1h 25m
2026-07-09 NSZ62Q LGW → AAL Jul 9, 15:10 UTCJul 9, 16:30 UTC1h 20m
2026-07-09 NSZ3516 CPH → LGW Jul 9, 12:10 UTCJul 9, 13:50 UTC1h 40m
2026-07-08 NSZ8539 - Jul 8, 10:10 UTCJul 8, 12:10 UTC2h 0m
2026-07-07 NSZ3298 - Jul 7, 17:15 UTCJul 7, 18:45 UTC1h 30m
2026-07-07 NSZ3095 - Jul 7, 15:45 UTCJul 7, 16:20 UTC35m
2026-07-07 NSZ3086 - Jul 7, 14:40 UTCJul 7, 15:10 UTC30m
2026-07-07 NSZ365L BCN → CPH Jul 7, 11:05 UTCJul 7, 13:45 UTC2h 40m
2026-07-07 NSZ56V - Jul 7, 07:00 UTCJul 7, 09:30 UTC2h 30m
2026-07-07 NSZ81E - Jul 7, 05:15 UTCJul 7, 05:45 UTC30m
2026-07-06 NSZ3929 NCE → AAL Jul 6, 18:00 UTCJul 6, 20:10 UTC2h 10m
2026-07-06 NSZ3928 AAL → NCE Jul 6, 15:30 UTCJul 6, 16:50 UTC1h 20m
2026-07-06 NSZ3928 AAL → NCE Jul 6, 14:45 UTCJul 6, 15:25 UTC40m
2026-07-06 NSZ3086 - Jul 6, 13:15 UTCJul 6, 13:45 UTC30m
2026-07-06 NSZ6EZ VLC → CPH Jul 6, 09:35 UTCJul 6, 12:25 UTC2h 50m
2026-07-06 NSZ3654 - Jul 6, 05:40 UTCJul 6, 08:25 UTC2h 45m
2026-07-05 NSZ3747 - Jul 5, 20:05 UTCJul 5, 22:05 UTC2h 0m
2026-07-05 NSZ3746 - Jul 5, 17:10 UTCJul 5, 18:50 UTC1h 40m
2026-07-05 NSZ3637 - Jul 5, 14:15 UTCJul 5, 15:45 UTC1h 30m
2026-07-05 NSZ3636 - Jul 5, 11:35 UTCJul 5, 13:00 UTC1h 25m
2026-07-05 NSZ3731 - Jul 5, 08:00 UTCJul 5, 10:15 UTC2h 15m
2026-07-05 NSZ3730 - Jul 5, 04:30 UTCJul 5, 06:25 UTC1h 55m

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?
Yes. Mode-S 4AB821 is currently airborne.
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, NSZ1KS, NSZ4KP, NSZ3646.