Apparatus

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sensors Mode-S transponder

A4A533

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N399LA · PILATUS PC-12 · operated by TVPX AIRCRAFT SOLUTIONS INC TRUSTEE

Hex
A4A533
Octal
51122463
Decimal
10,790,195
Country
US
Tail
N399LA
Type
PC12
No current signal · last broadcast 6d ago
Flights observed
177
Distinct callsigns
20
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S A4A533.

Country allocation

The ICAO 24-bit address A4A533 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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
STT208 Air St. Thomas 19 2026-05-23
STT329 Air St. Thomas 16 2026-05-24
STT204 Air St. Thomas 16 2026-05-23
STT319 Air St. Thomas 14 2026-05-22
STT305 Air St. Thomas 13 2026-05-22
STT228 Air St. Thomas 13 2026-05-24
STT224 Air St. Thomas 13 2026-05-24
STT218 Air St. Thomas 12 2026-05-23
STT325 Air St. Thomas 11 2026-05-24
STT309 Air St. Thomas 11 2026-05-22
STT694 Air St. Thomas 5 2026-05-21
STT995 Air St. Thomas 3 2026-05-15
STT795 Air St. Thomas 3 2026-05-16
STT994 Air St. Thomas 2 2026-05-15
STT791 Air St. Thomas 2 2026-05-02
STT72 Air St. Thomas 2 2026-04-20
STT70 Air St. Thomas 2 2026-05-12
STT692 Air St. Thomas 2 2026-04-26
STT690 Air St. Thomas 2 2026-04-24
STT321 Air St. Thomas 2 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-24 STT329 LNY → HNL May 24, 04:50 UTCMay 24, 05:15 UTC25m
2026-05-24 STT228 HNL → LNY May 24, 04:00 UTCMay 24, 04:20 UTC20m
2026-05-24 STT325 LNY → HNL May 24, 03:00 UTCMay 24, 03:20 UTC20m
2026-05-24 STT224 HNL → LNY May 24, 02:05 UTCMay 24, 02:25 UTC20m
2026-05-23 STT218 HNL → LNY May 23, 23:05 UTCMay 24, 00:05 UTC1h 0m
2026-05-23 STT208 HNL → LNY May 23, 18:00 UTCMay 23, 19:10 UTC1h 11m
2026-05-23 STT204 HNL → LNY May 23, 16:10 UTCMay 23, 17:20 UTC1h 10m
2026-05-23 STT329 LNY → HNL May 23, 04:00 UTCMay 23, 05:15 UTC1h 15m
2026-05-23 STT325 LNY → HNL May 23, 02:05 UTCMay 23, 03:15 UTC1h 9m
2026-05-22 STT218 HNL → LNY May 22, 23:10 UTCMay 23, 00:15 UTC1h 5m
2026-05-22 STT309 LNY → HNL May 22, 19:00 UTCMay 22, 19:20 UTC20m
2026-05-22 STT208 HNL → LNY May 22, 18:10 UTCMay 22, 18:30 UTC20m
2026-05-22 STT305 LNY → HNL May 22, 17:05 UTCMay 22, 17:25 UTC20m
2026-05-22 STT204 HNL → LNY May 22, 16:00 UTCMay 22, 16:20 UTC20m
2026-05-22 STT329 LNY → HNL May 22, 05:00 UTCMay 22, 05:20 UTC20m
2026-05-22 STT228 HNL → LNY May 22, 04:00 UTCMay 22, 04:20 UTC20m
2026-05-22 STT325 LNY → HNL May 22, 02:55 UTCMay 22, 03:15 UTC20m
2026-05-22 STT224 HNL → LNY May 22, 02:05 UTCMay 22, 02:25 UTC20m
2026-05-22 STT319 LNY → HNL May 22, 00:10 UTCMay 22, 00:30 UTC20m
2026-05-21 STT218 HNL → LNY May 21, 23:00 UTCMay 21, 23:20 UTC20m
2026-05-21 STT694 HNL → LNY May 21, 20:05 UTCMay 21, 21:00 UTC55m
2026-05-21 STT208 HNL → LNY May 21, 18:15 UTCMay 21, 19:15 UTC1h 0m
2026-05-21 STT204 HNL → LNY May 21, 16:15 UTCMay 21, 17:15 UTC1h 0m
2026-05-21 STT74 HNL → LNY May 21, 07:25 UTCMay 21, 08:15 UTC50m
2026-05-21 STT329 LNY → HNL May 21, 05:00 UTCMay 21, 05:20 UTC20m
2026-05-21 STT228 HNL → LNY May 21, 04:05 UTCMay 21, 04:25 UTC20m
2026-05-21 STT224 HNL → LNY May 21, 02:20 UTCMay 21, 03:20 UTC1h 0m
2026-05-20 STT319 LNY → HNL May 20, 23:50 UTCMay 21, 00:10 UTC20m
2026-05-20 STT218 HNL → LNY May 20, 22:55 UTCMay 20, 23:15 UTC20m
2026-05-20 STT208 HNL → LNY May 20, 18:15 UTCMay 20, 19:10 UTC55m
2026-05-20 STT204 HNL → LNY May 20, 16:10 UTCMay 20, 17:15 UTC1h 5m
2026-05-20 STT228 HNL → LNY May 20, 04:05 UTCMay 20, 05:05 UTC1h 1m
2026-05-20 STT224 HNL → LNY May 20, 02:10 UTCMay 20, 03:15 UTC1h 5m
2026-05-19 STT218 HNL → LNY May 19, 23:10 UTCMay 20, 00:10 UTC1h 0m
2026-05-19 STT309 LNY → HNL May 19, 18:55 UTCMay 19, 19:20 UTC25m
2026-05-19 STT208 HNL → LNY May 19, 18:00 UTCMay 19, 18:20 UTC20m
2026-05-19 STT305 LNY → HNL May 19, 16:05 UTCMay 19, 17:10 UTC1h 5m
2026-05-19 STT329 LNY → HNL May 19, 04:05 UTCMay 19, 05:10 UTC1h 5m
2026-05-19 STT224 HNL → LNY May 19, 02:10 UTCMay 19, 03:20 UTC1h 10m
2026-05-18 STT319 LNY → HNL May 18, 23:55 UTCMay 19, 00:15 UTC20m
2026-05-18 STT218 HNL → LNY May 18, 23:05 UTCMay 18, 23:25 UTC20m
2026-05-18 STT208 HNL → LNY May 18, 18:05 UTCMay 18, 19:20 UTC1h 14m
2026-05-18 STT204 HNL → LNY May 18, 16:00 UTCMay 18, 17:10 UTC1h 10m
2026-05-18 STT329 LNY → HNL May 18, 04:51 UTCMay 18, 05:15 UTC25m
2026-05-18 STT228 HNL → LNY May 18, 03:55 UTCMay 18, 04:15 UTC20m
2026-05-18 STT325 LNY → HNL May 18, 02:05 UTCMay 18, 03:20 UTC1h 15m
2026-05-17 STT319 LNY → HNL May 17, 23:15 UTCMay 18, 00:20 UTC1h 5m
2026-05-17 STT309 LNY → HNL May 17, 18:50 UTCMay 17, 19:15 UTC25m
2026-05-17 STT208 HNL → LNY May 17, 17:55 UTCMay 17, 18:15 UTC20m
2026-05-17 STT204 HNL → LNY May 17, 16:05 UTCMay 17, 17:15 UTC1h 10m

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 N399LA page for operator, model, and routing details .

Mode-S A4A533 frequently asked

What is Mode-S code A4A533?
A4A533 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N399LA.
Where is Mode-S A4A533 registered?
Mode-S code A4A533 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A4A533 broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4A533, octal 51122463, decimal 10,790,195.
What flights does A4A533 operate?
Mode-S A4A533 has broadcast 20 distinct callsigns, including STT208, STT329, STT204, STT319, STT305.