Apparatus

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sensors Mode-S transponder

A9FEF5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N743PA · PIPER PA-28-140/150/160/180 · operated by SKYWEST LEASING INC

Hex
A9FEF5
Octal
52377365
Decimal
11,140,853
Country
US
Tail
N743PA
Type
P28A
No current signal · last broadcast 1d ago
Flights observed
152
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A9FEF5.

Country allocation

The ICAO 24-bit address A9FEF5 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
ASI625 - 152 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 ASI625 - Jul 12, 18:20 UTCJul 12, 20:05 UTC1h 45m
2026-07-10 ASI625 - Jul 10, 21:05 UTCJul 10, 21:35 UTC30m
2026-07-10 ASI625 - Jul 10, 19:55 UTCJul 10, 20:30 UTC35m
2026-07-10 ASI625 - Jul 10, 16:55 UTCJul 10, 17:55 UTC1h 0m
2026-07-09 ASI625 - Jul 9, 12:55 UTCJul 9, 13:05 UTC10m
2026-07-09 ASI625 - Jul 9, 11:20 UTCJul 9, 12:20 UTC1h 0m
2026-07-08 ASI625 - Jul 8, 19:25 UTCJul 8, 21:05 UTC1h 40m
2026-06-25 ASI625 - Jun 25, 20:05 UTCJun 25, 21:44 UTC1h 40m
2026-06-25 ASI625 - Jun 25, 15:54 UTCJun 25, 18:00 UTC2h 5m
2026-06-25 ASI625 - Jun 25, 02:49 UTCJun 25, 05:29 UTC2h 40m
2026-06-24 ASI625 - Jun 24, 22:55 UTCJun 25, 00:24 UTC1h 30m
2026-06-24 ASI625 - Jun 24, 19:59 UTCJun 24, 21:40 UTC1h 40m
2026-06-24 ASI625 - Jun 24, 14:15 UTCJun 24, 16:59 UTC2h 45m
2026-06-24 ASI625 - Jun 24, 03:15 UTCJun 24, 03:44 UTC30m
2026-06-23 ASI625 - Jun 23, 23:59 UTCJun 24, 00:30 UTC30m
2026-06-23 ASI625 - Jun 23, 22:49 UTCJun 23, 23:24 UTC35m
2026-06-23 ASI625 - Jun 23, 18:45 UTCJun 23, 20:44 UTC2h 0m
2026-06-22 ASI625 - Jun 22, 21:10 UTCJun 22, 22:30 UTC1h 20m
2026-06-22 ASI625 - Jun 22, 18:49 UTCJun 22, 19:49 UTC1h 0m
2026-06-22 ASI625 - Jun 22, 17:29 UTCJun 22, 18:15 UTC45m
2026-06-22 ASI625 - Jun 22, 03:14 UTCJun 22, 05:34 UTC2h 20m
2026-06-22 ASI625 - Jun 22, 00:34 UTCJun 22, 02:00 UTC1h 25m
2026-06-21 ASI625 - Jun 21, 21:39 UTCJun 21, 22:54 UTC1h 15m
2026-06-21 ASI625 - Jun 21, 18:25 UTCJun 21, 20:14 UTC1h 50m
2026-06-21 ASI625 - Jun 21, 11:40 UTCJun 21, 13:34 UTC1h 55m
2026-06-20 ASI625 - Jun 20, 16:24 UTCJun 20, 17:24 UTC1h 0m
2026-06-19 ASI625 - Jun 19, 22:09 UTCJun 19, 23:29 UTC1h 20m
2026-06-18 ASI625 - Jun 18, 15:25 UTCJun 18, 17:25 UTC2h 0m
2026-06-18 ASI625 - Jun 18, 12:35 UTCJun 18, 13:50 UTC1h 15m
2026-06-18 ASI625 - Jun 18, 02:10 UTCJun 18, 05:25 UTC3h 15m
2026-06-17 ASI625 - Jun 17, 19:40 UTCJun 17, 20:50 UTC1h 10m
2026-06-17 ASI625 - Jun 17, 14:50 UTCJun 17, 15:20 UTC30m
2026-06-17 ASI625 - Jun 17, 12:35 UTCJun 17, 13:25 UTC50m
2026-06-13 ASI625 - Jun 13, 17:35 UTCJun 13, 18:15 UTC40m
2026-06-13 ASI625 - Jun 13, 15:00 UTCJun 13, 16:20 UTC1h 20m
2026-06-13 ASI625 - Jun 13, 11:35 UTCJun 13, 12:30 UTC55m
2026-06-11 ASI625 - Jun 11, 19:30 UTCJun 11, 20:05 UTC35m
2026-06-11 ASI625 - Jun 11, 18:30 UTCJun 11, 18:50 UTC20m
2026-06-10 ASI625 - Jun 10, 21:25 UTCJun 10, 21:55 UTC30m
2026-06-07 ASI625 - Jun 7, 19:40 UTCJun 7, 20:50 UTC1h 10m
2026-06-07 ASI625 - Jun 7, 16:50 UTCJun 7, 17:50 UTC1h 0m
2026-06-07 ASI625 - Jun 7, 03:45 UTCJun 7, 04:30 UTC45m
2026-06-07 ASI625 - Jun 7, 02:35 UTCJun 7, 03:05 UTC30m
2026-06-06 ASI625 - Jun 6, 21:35 UTCJun 6, 22:44 UTC1h 10m
2026-06-06 ASI625 - Jun 6, 19:10 UTCJun 6, 20:49 UTC1h 40m
2026-06-05 ASI625 - Jun 5, 19:25 UTCJun 5, 20:20 UTC55m
2026-06-04 ASI625 - Jun 4, 18:15 UTCJun 4, 19:20 UTC1h 5m
2026-06-03 ASI625 - Jun 3, 19:30 UTCJun 3, 22:10 UTC2h 40m
2026-06-03 ASI625 - Jun 3, 16:50 UTCJun 3, 17:50 UTC1h 0m
2026-06-03 ASI625 - Jun 3, 13:50 UTCJun 3, 15:15 UTC1h 25m

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 N743PA page for operator, model, and routing details .

Mode-S A9FEF5 frequently asked

What is Mode-S code A9FEF5?
A9FEF5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N743PA.
Where is Mode-S A9FEF5 registered?
Mode-S code A9FEF5 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 A9FEF5 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9FEF5, octal 52377365, decimal 11,140,853.
What flights does A9FEF5 operate?
Mode-S A9FEF5 has broadcast 1 distinct callsign, including ASI625.