Apparatus

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sensors Mode-S transponder

4AAD19

ICAO 24-bit transponder address · allocated to Sweden

Hex
4AAD19
Octal
22526431
Decimal
4,893,977
Country
SE
No current signal · last broadcast 2d ago
Flights observed
41
Distinct callsigns
1
Country
SE
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 4AAD19.

Country allocation

The ICAO 24-bit address 4AAD19 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 1 distinct

Callsign Airline Flights Last seen
SEKHY - 41 2026-07-13

Recent flights last 41

DateFlightRouteTakeoffLandingDuration
2026-07-13 SEKHY - Jul 13, 17:20 UTCJul 13, 17:50 UTC30m
2026-07-13 SEKHY - Jul 13, 10:30 UTCJul 13, 11:30 UTC1h 0m
2026-07-12 SEKHY - Jul 12, 14:30 UTCJul 12, 15:35 UTC1h 5m
2026-07-11 SEKHY - Jul 11, 14:20 UTCJul 11, 15:20 UTC1h 0m
2026-07-11 SEKHY - Jul 11, 10:35 UTCJul 11, 11:15 UTC40m
2026-07-11 SEKHY - Jul 11, 07:25 UTCJul 11, 08:05 UTC40m
2026-07-10 SEKHY - Jul 10, 13:30 UTCJul 10, 14:25 UTC55m
2026-07-09 SEKHY - Jul 9, 13:10 UTCJul 9, 14:15 UTC1h 5m
2026-07-08 SEKHY - Jul 8, 15:30 UTCJul 8, 16:30 UTC1h 0m
2026-07-01 SEKHY - Jul 1, 15:35 UTCJul 1, 16:45 UTC1h 10m
2026-06-30 SEKHY - Jun 30, 15:15 UTCJun 30, 16:15 UTC1h 0m
2026-06-29 SEKHY - Jun 29, 16:15 UTCJun 29, 17:30 UTC1h 15m
2026-06-29 SEKHY - Jun 29, 11:35 UTCJun 29, 12:20 UTC45m
2026-06-29 SEKHY - Jun 29, 08:35 UTCJun 29, 09:44 UTC1h 10m
2026-06-29 SEKHY - Jun 29, 06:29 UTCJun 29, 07:59 UTC1h 30m
2026-06-27 SEKHY - Jun 27, 16:14 UTCJun 27, 17:34 UTC1h 20m
2026-06-27 SEKHY - Jun 27, 11:30 UTCJun 27, 12:50 UTC1h 20m
2026-06-27 SEKHY - Jun 27, 07:55 UTCJun 27, 10:40 UTC2h 45m
2026-06-26 SEKHY - Jun 26, 16:24 UTCJun 26, 17:35 UTC1h 10m
2026-06-26 SEKHY - Jun 26, 11:14 UTCJun 26, 12:05 UTC50m
2026-06-12 SEKHY - Jun 12, 16:00 UTCJun 12, 16:10 UTC10m
2026-06-12 SEKHY - Jun 12, 09:10 UTCJun 12, 09:20 UTC10m
2026-06-11 SEKHY - Jun 11, 12:30 UTCJun 11, 16:05 UTC3h 35m
2026-06-11 SEKHY - Jun 11, 05:05 UTCJun 11, 07:55 UTC2h 50m
2026-06-10 SEKHY - Jun 10, 16:10 UTCJun 10, 18:00 UTC1h 50m
2026-06-10 SEKHY - Jun 10, 08:50 UTCJun 10, 10:10 UTC1h 20m
2026-06-07 SEKHY - Jun 7, 15:15 UTCJun 7, 15:25 UTC10m
2026-06-06 SEKHY - Jun 6, 14:40 UTCJun 6, 16:34 UTC1h 55m
2026-06-06 SEKHY - Jun 6, 12:49 UTCJun 6, 13:25 UTC35m
2026-06-06 SEKHY - Jun 6, 09:19 UTCJun 6, 10:30 UTC1h 10m
2026-06-05 SEKHY - Jun 5, 19:40 UTCJun 5, 19:50 UTC10m
2026-06-05 SEKHY - Jun 5, 18:45 UTCJun 5, 18:55 UTC10m
2026-06-03 SEKHY - Jun 3, 14:50 UTCJun 3, 15:30 UTC40m
2026-06-03 SEKHY - Jun 3, 11:20 UTCJun 3, 11:35 UTC15m
2026-06-03 SEKHY - Jun 3, 08:15 UTCJun 3, 08:35 UTC20m
2026-05-31 SEKHY - May 31, 19:50 UTCMay 31, 20:00 UTC10m
2026-05-31 SEKHY - May 31, 19:00 UTCMay 31, 19:10 UTC10m
2026-05-31 SEKHY - May 31, 17:35 UTCMay 31, 18:10 UTC35m
2026-05-31 SEKHY - May 31, 16:10 UTCMay 31, 16:30 UTC20m
2026-05-30 SEKHY - May 30, 18:10 UTCMay 30, 18:20 UTC10m
2026-05-30 SEKHY - May 30, 16:30 UTCMay 30, 16:40 UTC10m

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.

Mode-S 4AAD19 frequently asked

What is Mode-S code 4AAD19?
4AAD19 is an ICAO 24-bit transponder address. Allocated to Sweden.
Where is Mode-S 4AAD19 registered?
Mode-S code 4AAD19 is allocated to Sweden (SE). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 4AAD19 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 4AAD19, octal 22526431, decimal 4,893,977.
What flights does 4AAD19 operate?
Mode-S 4AAD19 has broadcast 1 distinct callsign, including SEKHY.