Apparatus

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sensors Mode-S transponder

AC7BA4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N903PP · PILATUS PC-12 · operated by AIR PACIFIC LLC

Hex
AC7BA4
Octal
53075644
Decimal
11,303,844
Country
US
Tail
N903PP
Type
PC12
No current signal · last broadcast 3d ago
Flights observed
54
Distinct callsigns
1
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S AC7BA4.

Country allocation

The ICAO 24-bit address AC7BA4 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 1 distinct

Callsign Airline Flights Last seen
STT90 Air St. Thomas 54 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-26 STT90 - May 26, 21:59 UTCMay 26, 22:59 UTC1h 0m
2026-05-21 STT90 - May 21, 02:25 UTCMay 21, 03:25 UTC1h 0m
2026-05-20 STT90 - May 20, 23:45 UTCMay 21, 01:05 UTC1h 20m
2026-05-20 STT90 - May 20, 21:50 UTCMay 20, 22:45 UTC55m
2026-05-20 STT90 - May 20, 19:25 UTCMay 20, 20:30 UTC1h 5m
2026-05-20 STT90 - May 20, 17:45 UTCMay 20, 18:35 UTC50m
2026-05-20 STT90 - May 20, 14:30 UTCMay 20, 14:40 UTC10m
2026-05-17 STT90 - May 17, 21:10 UTCMay 17, 22:40 UTC1h 30m
2026-05-17 STT90 - May 17, 18:45 UTCMay 17, 20:30 UTC1h 45m
2026-05-17 STT90 - May 17, 15:40 UTCMay 17, 17:25 UTC1h 45m
2026-05-17 STT90 - May 17, 13:10 UTCMay 17, 14:05 UTC55m
2026-05-15 STT90 - May 15, 18:25 UTCMay 15, 20:20 UTC1h 55m
2026-05-14 STT90 - May 14, 16:10 UTCMay 14, 17:25 UTC1h 15m
2026-05-13 STT90 - May 13, 19:30 UTCMay 13, 21:50 UTC2h 20m
2026-05-11 STT90 - May 11, 17:00 UTCMay 11, 17:40 UTC40m
2026-05-11 STT90 - May 11, 15:15 UTCMay 11, 16:05 UTC50m
2026-05-11 STT90 - May 11, 13:10 UTCMay 11, 14:15 UTC1h 5m
2026-05-09 STT90 - May 9, 21:00 UTCMay 9, 22:10 UTC1h 10m
2026-05-09 STT90 - May 9, 18:45 UTCMay 9, 19:05 UTC20m
2026-05-09 STT90 - May 9, 16:25 UTCMay 9, 17:20 UTC55m
2026-05-09 STT90 BOI → SLE May 9, 02:30 UTCMay 9, 03:55 UTC1h 25m
2026-05-09 STT90 BOI → SLE May 9, 01:15 UTCMay 9, 01:40 UTC25m
2026-05-02 STT90 BOI → SLE May 2, 20:10 UTCMay 2, 21:25 UTC1h 15m
2026-05-02 STT90 BOI → SLE May 2, 16:50 UTCMay 2, 19:40 UTC2h 50m
2026-05-02 STT90 BOI → SLE May 2, 13:30 UTCMay 2, 16:00 UTC2h 30m
2026-05-02 STT90 BOI → SLE May 2, 04:05 UTCMay 2, 05:05 UTC1h 0m
2026-04-29 STT90 BOI → SLE Apr 29, 20:45 UTCApr 29, 21:10 UTC25m
2026-04-28 STT90 BOI → SLE Apr 28, 14:00 UTCApr 28, 14:20 UTC20m
2026-04-25 STT90 BOI → SLE Apr 25, 19:50 UTCApr 25, 20:50 UTC1h 0m
2026-04-24 STT90 BOI → SLE Apr 24, 15:50 UTCApr 24, 16:45 UTC55m
2026-04-24 STT90 BOI → SLE Apr 24, 12:50 UTCApr 24, 13:35 UTC45m
2026-04-22 STT90 BOI → SLE Apr 22, 23:45 UTCApr 22, 23:55 UTC10m
2026-04-22 STT90 BOI → SLE Apr 22, 14:25 UTCApr 22, 14:50 UTC25m
2026-04-20 STT90 BOI → SLE Apr 20, 18:25 UTCApr 20, 19:25 UTC1h 0m
2026-04-18 STT90 BOI → SLE Apr 18, 22:45 UTCApr 18, 23:00 UTC15m
2026-04-18 STT90 BOI → SLE Apr 18, 20:35 UTCApr 18, 21:15 UTC40m
2026-04-18 STT90 BOI → SLE Apr 18, 19:05 UTCApr 18, 19:40 UTC35m
2026-04-18 STT90 BOI → SLE Apr 18, 16:50 UTCApr 18, 18:30 UTC1h 40m
2026-04-18 STT90 BOI → SLE Apr 18, 14:50 UTCApr 18, 16:15 UTC1h 25m
2026-04-17 STT90 BOI → SLE Apr 17, 17:40 UTCApr 17, 18:15 UTC35m
2026-04-17 STT90 BOI → SLE Apr 17, 16:20 UTCApr 17, 17:15 UTC55m
2026-04-16 STT90 BOI → SLE Apr 16, 23:20 UTCApr 16, 23:35 UTC15m
2026-04-16 STT90 BOI → SLE Apr 16, 22:24 UTCApr 16, 23:10 UTC45m
2026-04-16 STT90 BOI → SLE Apr 16, 21:14 UTCApr 16, 21:39 UTC25m
2026-04-16 STT90 BOI → SLE Apr 16, 20:15 UTCApr 16, 21:10 UTC55m
2026-04-14 STT90 BOI → SLE Apr 14, 19:05 UTCApr 14, 19:25 UTC20m
2026-04-14 STT90 BOI → SLE Apr 14, 16:50 UTCApr 14, 18:15 UTC1h 25m
2026-04-14 STT90 BOI → SLE Apr 14, 16:25 UTCApr 14, 16:45 UTC20m
2026-04-14 STT90 BOI → SLE Apr 14, 14:05 UTCApr 14, 14:45 UTC40m
2026-04-14 STT90 BOI → SLE Apr 14, 12:30 UTCApr 14, 12:45 UTC15m

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 N903PP page for operator, model, and routing details .

Mode-S AC7BA4 frequently asked

What is Mode-S code AC7BA4?
AC7BA4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N903PP.
Where is Mode-S AC7BA4 registered?
Mode-S code AC7BA4 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 AC7BA4 broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC7BA4, octal 53075644, decimal 11,303,844.
What flights does AC7BA4 operate?
Mode-S AC7BA4 has broadcast 1 distinct callsign, including STT90.