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sensors Mode-S transponder

A9E90C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N738CY · CESSNA 172 Skyhawk · operated by AMERICAN PATROLS INC

Hex
A9E90C
Octal
52364414
Decimal
11,135,244
Country
US
Tail
N738CY
Type
C172
No current signal · last broadcast Jul 26, 12:55 UTC
Flights observed
85
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 12:55 UTC

Last known position

Most recent position reported by Mode-S A9E90C.

Country allocation

The ICAO 24-bit address A9E90C 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
N738CY - 85 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N738CY - Jul 26, 12:05 UTCJul 26, 12:55 UTC50m
2026-07-23 N738CY - Jul 23, 17:55 UTCJul 23, 18:30 UTC35m
2026-07-23 N738CY - Jul 23, 15:35 UTCJul 23, 16:00 UTC25m
2026-07-23 N738CY - Jul 23, 12:45 UTCJul 23, 14:05 UTC1h 20m
2026-07-22 N738CY - Jul 22, 20:10 UTCJul 22, 20:40 UTC30m
2026-07-22 N738CY - Jul 22, 13:20 UTCJul 22, 14:00 UTC40m
2026-07-21 N738CY - Jul 21, 19:50 UTCJul 21, 20:35 UTC45m
2026-07-21 N738CY - Jul 21, 13:45 UTCJul 21, 14:05 UTC20m
2026-07-20 N738CY - Jul 20, 19:05 UTCJul 20, 19:20 UTC15m
2026-07-20 N738CY - Jul 20, 14:15 UTCJul 20, 14:30 UTC15m
2026-07-18 N738CY - Jul 18, 12:15 UTCJul 18, 12:25 UTC10m
2026-07-17 N738CY - Jul 17, 17:44 UTCJul 17, 18:00 UTC15m
2026-07-17 N738CY - Jul 17, 16:19 UTCJul 17, 16:44 UTC25m
2026-07-12 N738CY - Jul 12, 13:25 UTCJul 12, 14:05 UTC40m
2026-07-11 N738CY - Jul 11, 13:55 UTCJul 11, 14:50 UTC55m
2026-07-09 N738CY - Jul 9, 17:10 UTCJul 9, 19:45 UTC2h 35m
2026-07-09 N738CY - Jul 9, 12:20 UTCJul 9, 15:30 UTC3h 10m
2026-07-07 N738CY - Jul 7, 11:50 UTCJul 7, 12:55 UTC1h 5m
2026-06-27 N738CY - Jun 27, 19:49 UTCJun 27, 20:29 UTC40m
2026-06-27 N738CY - Jun 27, 11:59 UTCJun 27, 15:45 UTC3h 45m
2026-06-26 N738CY - Jun 26, 14:50 UTCJun 26, 18:20 UTC3h 30m
2026-06-26 N738CY - Jun 26, 12:29 UTCJun 26, 12:59 UTC30m
2026-06-25 N738CY - Jun 25, 17:44 UTCJun 25, 20:09 UTC2h 25m
2026-06-25 N738CY - Jun 25, 13:40 UTCJun 25, 16:20 UTC2h 40m
2026-06-24 N738CY - Jun 24, 17:50 UTCJun 24, 21:24 UTC3h 35m
2026-06-24 N738CY - Jun 24, 15:29 UTCJun 24, 16:34 UTC1h 5m
2026-06-24 N738CY - Jun 24, 13:34 UTCJun 24, 14:55 UTC1h 20m
2026-06-23 N738CY - Jun 23, 16:24 UTCJun 23, 17:44 UTC1h 20m
2026-06-17 N738CY - Jun 17, 19:05 UTCJun 17, 21:05 UTC2h 0m
2026-06-17 N738CY - Jun 17, 13:40 UTCJun 17, 18:05 UTC4h 25m
2026-06-15 N738CY - Jun 15, 17:40 UTCJun 15, 18:04 UTC25m
2026-06-13 N738CY - Jun 13, 17:45 UTCJun 13, 18:35 UTC50m
2026-06-13 N738CY - Jun 13, 12:15 UTCJun 13, 17:10 UTC4h 55m
2026-06-11 N738CY - Jun 11, 21:15 UTCJun 11, 21:50 UTC35m
2026-06-11 N738CY - Jun 11, 19:10 UTCJun 11, 19:35 UTC25m
2026-06-10 N738CY - Jun 10, 20:30 UTCJun 10, 20:50 UTC20m
2026-06-07 N738CY - Jun 7, 21:35 UTCJun 7, 21:50 UTC15m
2026-06-07 N738CY - Jun 7, 12:00 UTCJun 7, 13:00 UTC1h 0m
2026-05-31 N738CY - May 31, 14:20 UTCMay 31, 15:10 UTC50m
2026-05-31 N738CY - May 31, 11:50 UTCMay 31, 13:25 UTC1h 35m
2026-05-29 N738CY - May 29, 16:30 UTCMay 29, 17:25 UTC55m
2026-05-29 N738CY - May 29, 12:15 UTCMay 29, 13:10 UTC55m
2026-05-28 N738CY - May 28, 11:55 UTCMay 28, 12:05 UTC10m
2026-05-22 N738CY - May 22, 19:15 UTCMay 22, 20:20 UTC1h 5m
2026-05-22 N738CY - May 22, 17:55 UTCMay 22, 18:20 UTC25m
2026-05-22 N738CY - May 22, 14:40 UTCMay 22, 15:25 UTC45m
2026-05-22 N738CY - May 22, 12:55 UTCMay 22, 13:30 UTC35m
2026-05-20 N738CY - May 20, 19:15 UTCMay 20, 19:45 UTC30m
2026-05-17 N738CY - May 17, 12:10 UTCMay 17, 14:25 UTC2h 15m
2026-05-16 N738CY - May 16, 16:15 UTCMay 16, 16:35 UTC20m

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 N738CY page for operator, model, and routing details .

Mode-S A9E90C frequently asked

What is Mode-S code A9E90C?
A9E90C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N738CY.
Where is Mode-S A9E90C registered?
Mode-S code A9E90C 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 A9E90C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9E90C, octal 52364414, decimal 11,135,244.
What flights does A9E90C operate?
Mode-S A9E90C has broadcast 1 distinct callsign, including N738CY.