Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

4ACA84

ICAO 24-bit transponder address · allocated to Sweden

Currently assigned to SE-RTD · BOEING 737 MAX 8

Hex
4ACA84
Octal
22545204
Decimal
4,901,508
Country
SE
Tail
SE-RTD
Type
B38M
No current signal · last broadcast Jul 26, 19:00 UTC
Flights observed
527
Distinct callsigns
20
Country
SE
Last broadcast
Jul 26, 19:00 UTC

Last known position

Most recent position reported by Mode-S 4ACA84.

Country allocation

The ICAO 24-bit address 4ACA84 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
NSZ83AH Norwegian Air Sweden AOC 10 2026-07-23
NSZ4AW Norwegian Air Sweden AOC 10 2026-07-23
NSZ2941 Norwegian Air Sweden AOC 10 2026-07-19
NSZ2913 Norwegian Air Sweden AOC 10 2026-07-23
NSZ9WP Norwegian Air Sweden AOC 9 2026-07-23
NSZ6RD Norwegian Air Sweden AOC 9 2026-07-20
NSZ2940 - 9 2026-07-19
NSZ2621 Norwegian Air Sweden AOC 9 2026-07-20
NSZ2620 Norwegian Air Sweden AOC 9 2026-07-20
NSZ2613 Norwegian Air Sweden AOC 9 2026-07-20
NSZ2602 - 9 2026-07-16
NSZ23Y - 9 2026-07-16
NSZ6HT Norwegian Air Sweden AOC 8 2026-07-24
NSZ2845 - 8 2026-07-13
NSZ2844 - 8 2026-07-13
NSZ4BP Norwegian Air Sweden AOC 7 2026-07-25
NSZ2TH Norwegian Air Sweden AOC 7 2026-07-22
NSZ8YC - 6 2026-07-16
NSZ2615 Norwegian Air Sweden AOC 6 2026-07-21
NSZ1GT - 6 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSZ4KR ARN → LPA Jul 26, 13:55 UTCJul 26, 19:00 UTC5h 5m
2026-07-26 NSZ2NJ BCN → ARN Jul 26, 09:50 UTCJul 26, 12:50 UTC3h 0m
2026-07-26 NSZ4251 ARN → BCN Jul 26, 07:10 UTCJul 26, 08:10 UTC1h 0m
2026-07-26 NSZ4251 ARN → BCN Jul 26, 05:05 UTCJul 26, 07:05 UTC2h 1m
2026-07-25 NSZ4396 CHQ → ARN Jul 25, 18:10 UTCJul 25, 21:45 UTC3h 35m
2026-07-25 NSZ4395 ARN → CHQ Jul 25, 13:20 UTCJul 25, 16:30 UTC3h 10m
2026-07-25 NSZ4BP HEL → ARN Jul 25, 11:15 UTCJul 25, 12:00 UTC45m
2026-07-25 NSZ23PH PSA → HEL Jul 25, 07:20 UTCJul 25, 10:05 UTC2h 45m
2026-07-25 NSZ2942 HEL → PSA Jul 25, 03:30 UTCJul 25, 06:20 UTC2h 50m
2026-07-24 NSZ2889 AGP → HEL Jul 24, 20:05 UTCJul 25, 00:20 UTC4h 15m
2026-07-24 NSZ6HT HEL → AGP Jul 24, 14:10 UTCJul 24, 18:50 UTC4h 40m
2026-07-24 NSZ2975 LCA → HEL Jul 24, 08:40 UTCJul 24, 13:10 UTC4h 30m
2026-07-24 NSZ2974 HEL → LCA Jul 24, 03:30 UTCJul 24, 07:25 UTC3h 55m
2026-07-23 NSZ2913 ALC → HEL Jul 23, 19:55 UTCJul 24, 00:05 UTC4h 10m
2026-07-23 NSZ9WP HEL → ALC Jul 23, 15:05 UTCJul 23, 18:55 UTC3h 50m
2026-07-23 NSZ83AH AGP → HEL Jul 23, 09:15 UTCJul 23, 13:35 UTC4h 20m
2026-07-23 NSZ4AW HEL → AGP Jul 23, 03:45 UTCJul 23, 08:00 UTC4h 15m
2026-07-22 NSZ2887 AGP → HEL Jul 22, 18:25 UTCJul 22, 22:15 UTC3h 50m
2026-07-22 NSZ6HT HEL → AGP Jul 22, 12:55 UTCJul 22, 17:15 UTC4h 20m
2026-07-22 NSZ2TH HEL → NCE Jul 22, 04:40 UTCJul 22, 11:40 UTC7h 0m
2026-07-21 NSZ2831 TIA → HEL Jul 21, 21:05 UTCJul 21, 23:35 UTC2h 30m
2026-07-21 NSZ2830 HEL → TIA Jul 21, 16:45 UTCJul 21, 19:15 UTC2h 30m
2026-07-21 NSZ2615 ARN → HEL Jul 21, 14:50 UTCJul 21, 15:30 UTC40m
2026-07-21 NSZ4BP HEL → ARN Jul 21, 13:10 UTCJul 21, 14:00 UTC50m
2026-07-21 NSZ6FV ATH → HEL Jul 21, 09:00 UTCJul 21, 12:15 UTC3h 15m
2026-07-21 NSZ2962 HEL → ATH Jul 21, 04:05 UTCJul 21, 07:35 UTC3h 30m
2026-07-20 NSZ2953 - Jul 20, 23:00 UTCJul 20, 23:10 UTC10m
2026-07-20 NSZ2953 - Jul 20, 19:50 UTCJul 20, 21:55 UTC2h 5m
2026-07-20 NSZ2952 - Jul 20, 14:50 UTCJul 20, 18:30 UTC3h 40m
2026-07-20 NSZ2613 ARN → HEL Jul 20, 12:50 UTCJul 20, 13:30 UTC40m
2026-07-20 NSZ2621 PRG → ARN Jul 20, 10:20 UTCJul 20, 11:50 UTC1h 30m
2026-07-20 NSZ2620 ARN → PRG Jul 20, 07:40 UTCJul 20, 09:10 UTC1h 30m
2026-07-20 NSZ6RD HEL → ARN Jul 20, 05:40 UTCJul 20, 06:30 UTC50m
2026-07-19 NSZ2941 BGY → HEL Jul 19, 19:05 UTCJul 19, 21:35 UTC2h 30m
2026-07-19 NSZ2940 HEL → BGY Jul 19, 15:00 UTCJul 19, 17:55 UTC2h 55m
2026-07-19 NSZ2613 ARN → HEL Jul 19, 13:00 UTCJul 19, 13:40 UTC40m
2026-07-19 NSZ2633 KRK → ARN Jul 19, 09:45 UTCJul 19, 11:10 UTC1h 25m
2026-07-19 NSZ2632 ARN → KRK Jul 19, 07:00 UTCJul 19, 08:40 UTC1h 40m
2026-07-19 NSZ6RD HEL → ARN Jul 19, 05:25 UTCJul 19, 06:10 UTC45m
2026-07-18 NSZ2827 - Jul 18, 18:00 UTCJul 18, 20:55 UTC2h 55m
2026-07-18 NSZ2826 - Jul 18, 14:05 UTCJul 18, 16:45 UTC2h 40m
2026-07-18 NSZ2891 PMI → HEL Jul 18, 08:45 UTCJul 18, 12:25 UTC3h 40m
2026-07-18 NSZ2890 HEL → PMI Jul 18, 03:20 UTCJul 18, 07:20 UTC4h 0m
2026-07-17 NSZ2863 OTP → HEL Jul 17, 18:44 UTCJul 17, 21:20 UTC2h 35m
2026-07-17 NSZ2862 HEL → OTP Jul 17, 15:15 UTCJul 17, 17:40 UTC2h 25m
2026-07-17 NSZ2613 ARN → HEL Jul 17, 13:00 UTCJul 17, 13:40 UTC40m
2026-07-17 NSZ2621 PRG → ARN Jul 17, 10:20 UTCJul 17, 11:45 UTC1h 25m
2026-07-17 NSZ2620 ARN → PRG Jul 17, 07:30 UTCJul 17, 09:10 UTC1h 40m
2026-07-17 NSZ6RD HEL → ARN Jul 17, 05:35 UTCJul 17, 06:15 UTC40m
2026-07-16 NSZ1GT - Jul 16, 20:55 UTCJul 16, 21:35 UTC40m

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

Mode-S 4ACA84 frequently asked

What is Mode-S code 4ACA84?
4ACA84 is an ICAO 24-bit transponder address. Allocated to Sweden. Assigned to SE-RTD.
Where is Mode-S 4ACA84 registered?
Mode-S code 4ACA84 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4ACA84 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4ACA84, octal 22545204, decimal 4,901,508.
What flights does 4ACA84 operate?
Mode-S 4ACA84 has broadcast 20 distinct callsigns, including NSZ83AH, NSZ4AW, NSZ2941, NSZ2913, NSZ9WP.