Apparatus

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sensors Mode-S transponder

4ACA99

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTY · BOEING 737 MAX 8

Hex
4ACA99
Octal
22545231
Decimal
4,901,529
Country
SE
Tail
SE-RTY
Type
B38M
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
440
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S 4ACA99.

Country allocation

The ICAO 24-bit address 4ACA99 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
NSZ5070 - 14 2026-07-03
NSZ5071 Norwegian Air Sweden AOC 13 2026-07-03
NSZ5023 - 13 2026-06-30
NSZ9BP - 12 2026-07-02
NSZ2TU - 12 2026-06-30
NSZ80W - 10 2026-07-05
NSZ5PE - 10 2026-07-04
NSZ5085 - 10 2026-07-05
NSZ5DM - 9 2026-07-04
NSZ6VU - 7 2026-07-04
NSZ5TQ Norwegian Air Sweden AOC 7 2026-07-02
NSZ5141 - 7 2026-06-30
NSZ5140 - 7 2026-06-30
NSZ5075 - 7 2026-06-29
NSZ5074 - 6 2026-07-07
NSZ5021 - 6 2026-07-07
NSZ46BA - 5 2026-06-24
NSZ2JM - 5 2026-07-07
NSZ8TQ Norwegian Air Sweden AOC 4 2026-04-30
NSZ8ML Norwegian Air Sweden AOC 4 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ3659 BCN → CPH Jul 26, 19:20 UTCJul 26, 21:55 UTC2h 35m
2026-07-26 NSZ3658 CPH → BCN Jul 26, 15:15 UTCJul 26, 17:45 UTC2h 30m
2026-07-26 NSZ3093 AAL → CPH Jul 26, 13:30 UTCJul 26, 14:00 UTC30m
2026-07-26 NSZ8YZ CPH → AAL Jul 26, 12:10 UTCJul 26, 12:40 UTC30m
2026-07-26 NSZ5TP LGW → CPH Jul 26, 09:50 UTCJul 26, 11:10 UTC1h 20m
2026-07-26 NSZ3510 CPH → LGW Jul 26, 06:40 UTCJul 26, 08:20 UTC1h 40m
2026-07-25 NSZ82ME DBV → CPH Jul 25, 20:35 UTCJul 25, 22:40 UTC2h 5m
2026-07-25 NSZ3280 CPH → DBV Jul 25, 17:40 UTCJul 25, 19:40 UTC2h 0m
2026-07-25 NSZ3GC LGW → CPH Jul 25, 15:25 UTCJul 25, 16:45 UTC1h 20m
2026-07-25 NSZ3516 CPH → LGW Jul 25, 12:45 UTCJul 25, 14:10 UTC1h 25m
2026-07-25 NSZ3731 FCO → CPH Jul 25, 09:20 UTCJul 25, 11:30 UTC2h 10m
2026-07-25 NSZ3730 CPH → FCO Jul 25, 05:15 UTCJul 25, 07:15 UTC2h 0m
2026-07-24 NSZ3291 PRN → CPH Jul 24, 19:20 UTCJul 24, 21:45 UTC2h 25m
2026-07-24 NSZ3290 CPH → PRN Jul 24, 15:50 UTCJul 24, 17:35 UTC1h 45m
2026-07-24 NSZ89C PRG → CPH Jul 24, 13:00 UTCJul 24, 14:05 UTC1h 5m
2026-07-24 NSZ8ML CPH → PRG Jul 24, 10:50 UTCJul 24, 11:45 UTC55m
2026-07-24 NSZ6GW BOD → CPH Jul 24, 07:55 UTCJul 24, 10:00 UTC2h 5m
2026-07-24 NSZ32JW CPH → BOD Jul 24, 04:55 UTCJul 24, 07:00 UTC2h 5m
2026-07-23 NSZ3235 OSL → CPH Jul 23, 20:25 UTCJul 23, 21:15 UTC50m
2026-07-23 NSZ3234 CPH → OSL Jul 23, 18:45 UTCJul 23, 19:45 UTC1h 0m
2026-07-23 NSZ3743 OLB → CPH Jul 23, 15:35 UTCJul 23, 17:55 UTC2h 20m
2026-07-23 NSZ3742 CPH → OLB Jul 23, 12:15 UTCJul 23, 14:25 UTC2h 10m
2026-07-23 NSZ3197 ARN → CPH Jul 23, 10:05 UTCJul 23, 10:55 UTC50m
2026-07-23 NSZ3196 CPH → ARN Jul 23, 08:15 UTCJul 23, 09:10 UTC55m
2026-07-23 NSZ9BH AAL → CPH Jul 23, 06:50 UTCJul 23, 07:20 UTC30m
2026-07-23 NSZ3080 CPH → AAL Jul 23, 05:50 UTCJul 23, 06:15 UTC25m
2026-07-22 NSZ3235 OSL → CPH Jul 22, 20:20 UTCJul 22, 21:10 UTC50m
2026-07-22 NSZ3234 CPH → OSL Jul 22, 18:45 UTCJul 22, 19:35 UTC50m
2026-07-22 NSZ3231 OSL → CPH Jul 22, 17:00 UTCJul 22, 17:50 UTC50m
2026-07-22 NSZ3230 CPH → OSL Jul 22, 15:15 UTCJul 22, 16:10 UTC55m
2026-07-22 NSZ3741 VCE → CPH Jul 22, 12:20 UTCJul 22, 14:00 UTC1h 40m
2026-07-21 NSZ3675 TFS → CPH Jul 21, 18:35 UTCJul 21, 21:50 UTC3h 15m
2026-07-21 NSZ3674 CPH → AGP Jul 21, 14:15 UTCJul 21, 17:25 UTC3h 10m
2026-07-21 NSZ1KS AGP → CPH Jul 21, 09:40 UTCJul 21, 12:50 UTC3h 10m
2026-07-21 NSZ6PY CPH → AGP Jul 21, 05:20 UTCJul 21, 08:20 UTC3h 0m
2026-07-20 NSZ3097 AAL → CPH Jul 20, 18:30 UTCJul 20, 18:55 UTC25m
2026-07-20 NSZ2NZ CPH → AAL Jul 20, 17:25 UTCJul 20, 17:50 UTC25m
2026-07-20 NSZ3629 MPL → CPH Jul 20, 14:35 UTCJul 20, 16:30 UTC1h 55m
2026-07-20 NSZ3628 CPH → MPL Jul 20, 11:35 UTCJul 20, 13:40 UTC2h 5m
2026-07-20 NSZ3731 FCO → CPH Jul 20, 08:15 UTCJul 20, 10:20 UTC2h 5m
2026-07-20 NSZ3730 CPH → FCO Jul 20, 04:40 UTCJul 20, 06:40 UTC2h 0m
2026-07-19 NSZ3213 ARN → CPH Jul 19, 20:40 UTCJul 19, 21:40 UTC1h 0m
2026-07-19 NSZ3212 CPH → ARN Jul 19, 18:35 UTCJul 19, 19:25 UTC50m
2026-07-19 NSZ3153 HEL → CPH Jul 19, 16:20 UTCJul 19, 17:45 UTC1h 25m
2026-07-19 NSZ3152 CPH → HEL Jul 19, 14:10 UTCJul 19, 15:20 UTC1h 10m
2026-07-19 NSZ3225 CPH → OSL Jul 19, 12:25 UTCJul 19, 13:10 UTC45m
2026-07-19 NSZ3224 CPH → OSL Jul 19, 10:40 UTCJul 19, 11:35 UTC55m
2026-07-19 NSZ3629 MPL → CPH Jul 19, 07:45 UTCJul 19, 09:40 UTC1h 55m
2026-07-19 NSZ3628 CPH → MPL Jul 19, 04:45 UTCJul 19, 06:55 UTC2h 10m
2026-07-18 NSZ3667 - Jul 18, 20:15 UTCJul 18, 22:50 UTC2h 35m

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

Mode-S 4ACA99 frequently asked

What is Mode-S code 4ACA99?
4ACA99 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTY.
Where is Mode-S 4ACA99 registered?
Mode-S code 4ACA99 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA99 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA99, octal 22545231, decimal 4,901,529.
What flights does 4ACA99 operate?
Mode-S 4ACA99 has broadcast 20 distinct callsigns, including NSZ5070, NSZ5071, NSZ5023, NSZ9BP, NSZ2TU.