Apparatus

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sensors Mode-S transponder

A9E745

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N737YU · CESSNA 172 Skyhawk · operated by LAKE ELMO AERO LLC

Hex
A9E745
Octal
52363505
Decimal
11,134,789
Country
US
Tail
N737YU
Type
C172
No current signal · last broadcast 11h ago
Flights observed
255
Distinct callsigns
1
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A9E745.

Country allocation

The ICAO 24-bit address A9E745 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
N737YU - 255 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 N737YU - Jul 20, 16:25 UTCJul 20, 16:35 UTC10m
2026-07-19 N737YU - Jul 19, 21:45 UTCJul 19, 22:50 UTC1h 5m
2026-07-18 N737YU - Jul 18, 17:05 UTCJul 18, 17:45 UTC40m
2026-07-18 N737YU - Jul 18, 13:45 UTCJul 18, 14:30 UTC45m
2026-07-17 N737YU - Jul 17, 21:10 UTCJul 17, 21:39 UTC30m
2026-07-17 N737YU - Jul 17, 14:04 UTCJul 17, 14:20 UTC15m
2026-07-17 N737YU - Jul 17, 12:25 UTCJul 17, 13:50 UTC1h 25m
2026-07-17 N737YU - Jul 17, 03:50 UTCJul 17, 04:04 UTC15m
2026-07-15 N737YU - Jul 15, 17:20 UTCJul 15, 17:35 UTC15m
2026-07-15 N737YU - Jul 15, 16:55 UTCJul 15, 17:15 UTC20m
2026-07-15 N737YU - Jul 15, 02:55 UTCJul 15, 03:45 UTC50m
2026-07-14 N737YU - Jul 14, 16:45 UTCJul 14, 17:40 UTC55m
2026-07-14 N737YU - Jul 14, 12:55 UTCJul 14, 14:50 UTC1h 55m
2026-07-13 N737YU - Jul 13, 23:25 UTCJul 14, 00:40 UTC1h 15m
2026-07-13 N737YU - Jul 13, 20:00 UTCJul 13, 21:35 UTC1h 35m
2026-07-13 N737YU - Jul 13, 17:15 UTCJul 13, 18:15 UTC1h 0m
2026-07-13 N737YU - Jul 13, 14:25 UTCJul 13, 14:35 UTC10m
2026-07-13 N737YU - Jul 13, 13:35 UTCJul 13, 14:10 UTC35m
2026-07-12 N737YU - Jul 12, 20:25 UTCJul 12, 21:05 UTC40m
2026-07-12 N737YU - Jul 12, 17:15 UTCJul 12, 19:45 UTC2h 30m
2026-07-12 N737YU - Jul 12, 00:55 UTCJul 12, 02:20 UTC1h 25m
2026-07-11 N737YU - Jul 11, 20:30 UTCJul 11, 21:00 UTC30m
2026-07-11 N737YU - Jul 11, 17:30 UTCJul 11, 18:45 UTC1h 15m
2026-07-11 N737YU - Jul 11, 15:25 UTCJul 11, 16:45 UTC1h 20m
2026-07-11 N737YU - Jul 11, 12:40 UTCJul 11, 13:45 UTC1h 5m
2026-07-11 N737YU - Jul 11, 00:00 UTCJul 11, 00:10 UTC10m
2026-07-10 N737YU - Jul 10, 22:55 UTCJul 10, 23:45 UTC50m
2026-07-10 N737YU - Jul 10, 20:20 UTCJul 10, 21:40 UTC1h 20m
2026-07-10 N737YU - Jul 10, 18:40 UTCJul 10, 19:10 UTC30m
2026-07-10 N737YU - Jul 10, 17:10 UTCJul 10, 17:40 UTC30m
2026-07-10 N737YU - Jul 10, 14:10 UTCJul 10, 14:55 UTC45m
2026-07-10 N737YU - Jul 10, 12:55 UTCJul 10, 13:35 UTC40m
2026-07-10 N737YU - Jul 10, 12:10 UTCJul 10, 12:15 UTC5m
2026-07-10 N737YU - Jul 10, 00:35 UTCJul 10, 01:35 UTC1h 0m
2026-07-09 N737YU - Jul 9, 23:25 UTCJul 9, 23:35 UTC10m
2026-07-09 N737YU - Jul 9, 22:40 UTCJul 9, 23:20 UTC40m
2026-07-09 N737YU - Jul 9, 20:40 UTCJul 9, 21:20 UTC40m
2026-07-09 N737YU - Jul 9, 18:55 UTCJul 9, 19:30 UTC35m
2026-07-09 N737YU - Jul 9, 16:50 UTCJul 9, 17:55 UTC1h 5m
2026-07-09 N737YU - Jul 9, 16:30 UTCJul 9, 16:45 UTC15m
2026-07-09 N737YU - Jul 9, 13:55 UTCJul 9, 14:45 UTC50m
2026-07-09 N737YU - Jul 9, 13:35 UTCJul 9, 13:50 UTC15m
2026-07-07 N737YU - Jul 7, 18:40 UTCJul 7, 19:50 UTC1h 10m
2026-07-07 N737YU - Jul 7, 12:45 UTCJul 7, 14:05 UTC1h 20m
2026-07-06 N737YU - Jul 6, 21:50 UTCJul 6, 22:00 UTC10m
2026-07-06 N737YU - Jul 6, 20:45 UTCJul 6, 21:00 UTC15m
2026-07-06 N737YU - Jul 6, 16:10 UTCJul 6, 18:15 UTC2h 5m
2026-07-05 N737YU - Jul 5, 20:45 UTCJul 5, 21:20 UTC35m
2026-07-03 N737YU - Jul 3, 20:00 UTCJul 3, 20:30 UTC30m
2026-07-03 N737YU - Jul 3, 18:30 UTCJul 3, 19:05 UTC35m

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 N737YU page for operator, model, and routing details .

Mode-S A9E745 frequently asked

What is Mode-S code A9E745?
A9E745 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N737YU.
Where is Mode-S A9E745 registered?
Mode-S code A9E745 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 A9E745 broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9E745, octal 52363505, decimal 11,134,789.
What flights does A9E745 operate?
Mode-S A9E745 has broadcast 1 distinct callsign, including N737YU.