Apparatus

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sensors Mode-S transponder

A9F44C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N740U · PIPER PA-28-140/150/160/180 · operated by OHIO UNIVERSITY, DEPARTMENT OF AVIATION

Hex
A9F44C
Octal
52372114
Decimal
11,138,124
Country
US
Tail
N740U
Type
P28A
No current signal · last broadcast 2d ago
Flights observed
150
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A9F44C.

Country allocation

The ICAO 24-bit address A9F44C 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
N740U - 150 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N740U - Jul 17, 00:25 UTCJul 17, 01:09 UTC45m
2026-07-16 N740U - Jul 16, 17:20 UTCJul 16, 18:00 UTC40m
2026-07-16 N740U ATO → ATO Jul 16, 12:40 UTCJul 16, 15:05 UTC2h 25m
2026-07-15 N740U - Jul 15, 20:55 UTCJul 15, 22:10 UTC1h 15m
2026-07-15 N740U - Jul 15, 18:35 UTCJul 15, 19:35 UTC1h 0m
2026-07-15 N740U - Jul 15, 15:35 UTCJul 15, 17:55 UTC2h 20m
2026-07-15 N740U ATO → ATO Jul 15, 12:40 UTCJul 15, 14:15 UTC1h 35m
2026-07-14 N740U - Jul 14, 20:35 UTCJul 14, 21:45 UTC1h 10m
2026-07-14 N740U ATO → ATO Jul 14, 19:05 UTCJul 14, 19:40 UTC35m
2026-07-14 N740U - Jul 14, 17:15 UTCJul 14, 18:30 UTC1h 15m
2026-07-14 N740U - Jul 14, 14:55 UTCJul 14, 15:30 UTC35m
2026-07-14 N740U ATO → ATO Jul 14, 12:35 UTCJul 14, 13:25 UTC50m
2026-07-14 N740U ATO → ATO Jul 14, 02:30 UTCJul 14, 02:55 UTC25m
2026-07-13 N740U - Jul 13, 22:50 UTCJul 14, 00:00 UTC1h 10m
2026-07-13 N740U - Jul 13, 19:55 UTCJul 13, 22:00 UTC2h 5m
2026-07-13 N740U - Jul 13, 17:35 UTCJul 13, 18:50 UTC1h 15m
2026-07-13 N740U - Jul 13, 15:30 UTCJul 13, 16:50 UTC1h 20m
2026-07-08 N740U - Jul 8, 14:30 UTCJul 8, 14:50 UTC20m
2026-07-07 N740U - Jul 7, 23:15 UTCJul 8, 02:25 UTC3h 10m
2026-06-29 N740U - Jun 29, 18:34 UTCJun 29, 19:24 UTC50m
2026-06-25 N740U ATO → ATO Jun 25, 23:14 UTCJun 25, 23:49 UTC35m
2026-06-25 N740U - Jun 25, 20:34 UTCJun 25, 20:49 UTC15m
2026-06-25 N740U ATO → ATO Jun 25, 18:10 UTCJun 25, 19:09 UTC1h 0m
2026-06-25 N740U - Jun 25, 16:45 UTCJun 25, 17:34 UTC50m
2026-06-25 N740U - Jun 25, 14:59 UTCJun 25, 15:54 UTC55m
2026-06-25 N740U - Jun 25, 13:55 UTCJun 25, 14:20 UTC25m
2026-06-25 N740U - Jun 25, 13:09 UTCJun 25, 13:20 UTC10m
2026-06-24 N740U ATO → ATO Jun 24, 20:14 UTCJun 24, 20:49 UTC35m
2026-06-24 N740U - Jun 24, 19:20 UTCJun 24, 19:34 UTC15m
2026-06-24 N740U - Jun 24, 18:34 UTCJun 24, 18:44 UTC10m
2026-06-24 N740U - Jun 24, 15:44 UTCJun 24, 16:40 UTC55m
2026-06-24 N740U - Jun 24, 02:09 UTCJun 24, 04:34 UTC2h 25m
2026-06-23 N740U - Jun 23, 23:39 UTCJun 24, 00:25 UTC45m
2026-06-23 N740U - Jun 23, 21:29 UTCJun 23, 22:34 UTC1h 5m
2026-06-23 N740U - Jun 23, 18:39 UTCJun 23, 20:40 UTC2h 0m
2026-06-19 N740U - Jun 19, 14:39 UTCJun 19, 15:14 UTC35m
2026-06-17 N740U - Jun 17, 15:30 UTCJun 17, 16:15 UTC45m
2026-06-17 N740U - Jun 17, 13:30 UTCJun 17, 14:45 UTC1h 15m
2026-06-17 N740U ATO → ATO Jun 17, 02:05 UTCJun 17, 03:05 UTC1h 0m
2026-06-16 N740U - Jun 16, 23:45 UTCJun 17, 00:10 UTC25m
2026-06-16 N740U - Jun 16, 20:35 UTCJun 16, 22:05 UTC1h 30m
2026-06-16 N740U ATO → ATO Jun 16, 18:50 UTCJun 16, 19:15 UTC25m
2026-06-16 N740U - Jun 16, 16:25 UTCJun 16, 17:10 UTC45m
2026-06-16 N740U ATO → ATO Jun 16, 14:50 UTCJun 16, 15:30 UTC40m
2026-06-16 N740U - Jun 16, 12:45 UTCJun 16, 13:44 UTC1h 0m
2026-06-16 N740U - Jun 16, 10:00 UTCJun 16, 10:55 UTC55m
2026-06-16 N740U - Jun 16, 04:20 UTCJun 16, 04:45 UTC25m
2026-06-16 N740U - Jun 16, 02:40 UTCJun 16, 03:10 UTC30m
2026-06-16 N740U MGW → ATO Jun 16, 00:20 UTCJun 16, 01:25 UTC1h 5m
2026-06-15 N740U - Jun 15, 21:40 UTCJun 15, 23:25 UTC1h 45m

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 N740U page for operator, model, and routing details .

Mode-S A9F44C frequently asked

What is Mode-S code A9F44C?
A9F44C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N740U.
Where is Mode-S A9F44C registered?
Mode-S code A9F44C 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 A9F44C 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 A9F44C, octal 52372114, decimal 11,138,124.
What flights does A9F44C operate?
Mode-S A9F44C has broadcast 1 distinct callsign, including N740U.