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sensors Mode-S transponder

A9CAA0

ICAO 24-bit transponder address · allocated to United States

Hex
A9CAA0
Octal
52345240
Decimal
11,127,456
Country
US
Broadcasting now · callsign N73VU · 1,225 ft
Flights observed
146
Distinct callsigns
1
Country
US
Last broadcast
1h ago

Current position

A9CAA0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9CAA0 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
N73VU - 146 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N73VU - Jul 15, 18:35 UTCJul 15, 19:05 UTC30m
2026-07-15 N73VU - Jul 15, 15:30 UTCJul 15, 16:05 UTC35m
2026-07-15 N73VU - Jul 15, 14:00 UTCJul 15, 14:15 UTC15m
2026-07-15 N73VU - Jul 15, 01:15 UTCJul 15, 01:55 UTC40m
2026-07-14 N73VU - Jul 14, 23:15 UTCJul 14, 23:40 UTC25m
2026-07-14 N73VU - Jul 14, 21:25 UTCJul 14, 21:40 UTC15m
2026-07-14 N73VU - Jul 14, 19:20 UTCJul 14, 20:30 UTC1h 10m
2026-07-14 N73VU - Jul 14, 16:45 UTCJul 14, 17:15 UTC30m
2026-07-14 N73VU - Jul 14, 15:40 UTCJul 14, 16:10 UTC30m
2026-07-14 N73VU - Jul 14, 01:45 UTCJul 14, 03:45 UTC2h 0m
2026-07-13 N73VU - Jul 13, 22:55 UTCJul 14, 00:15 UTC1h 20m
2026-07-13 N73VU - Jul 13, 20:15 UTCJul 13, 20:45 UTC30m
2026-07-13 N73VU - Jul 13, 18:15 UTCJul 13, 19:15 UTC1h 0m
2026-07-13 N73VU - Jul 13, 16:55 UTCJul 13, 17:35 UTC40m
2026-07-13 N73VU - Jul 13, 15:30 UTCJul 13, 16:15 UTC45m
2026-07-13 N73VU - Jul 13, 14:00 UTCJul 13, 14:50 UTC50m
2026-07-13 N73VU - Jul 13, 12:30 UTCJul 13, 13:05 UTC35m
2026-07-12 N73VU - Jul 12, 22:10 UTCJul 12, 22:55 UTC45m
2026-07-12 N73VU - Jul 12, 20:50 UTCJul 12, 21:10 UTC20m
2026-07-12 N73VU - Jul 12, 17:45 UTCJul 12, 17:55 UTC10m
2026-06-25 N73VU - Jun 25, 20:19 UTCJun 25, 21:05 UTC45m
2026-06-25 N73VU - Jun 25, 18:45 UTCJun 25, 19:24 UTC40m
2026-06-25 N73VU - Jun 25, 00:19 UTCJun 25, 01:35 UTC1h 15m
2026-06-24 N73VU - Jun 24, 18:25 UTCJun 24, 20:44 UTC2h 20m
2026-06-24 N73VU - Jun 24, 16:50 UTCJun 24, 17:20 UTC30m
2026-06-24 N73VU - Jun 24, 15:24 UTCJun 24, 16:05 UTC40m
2026-06-24 N73VU - Jun 24, 13:54 UTCJun 24, 14:39 UTC45m
2026-06-24 N73VU - Jun 24, 12:40 UTCJun 24, 13:14 UTC35m
2026-06-23 N73VU - Jun 23, 23:05 UTCJun 24, 00:20 UTC1h 15m
2026-06-23 N73VU - Jun 23, 19:55 UTCJun 23, 20:44 UTC50m
2026-06-23 N73VU - Jun 23, 18:10 UTCJun 23, 19:10 UTC1h 0m
2026-06-23 N73VU - Jun 23, 17:15 UTCJun 23, 17:30 UTC15m
2026-06-23 N73VU - Jun 23, 15:50 UTCJun 23, 16:39 UTC50m
2026-06-23 N73VU - Jun 23, 13:59 UTCJun 23, 14:59 UTC1h 0m
2026-06-23 N73VU - Jun 23, 12:29 UTCJun 23, 13:05 UTC35m
2026-06-23 N73VU - Jun 23, 01:10 UTCJun 23, 02:04 UTC55m
2026-06-21 N73VU - Jun 21, 05:20 UTCJun 21, 05:35 UTC15m
2026-06-21 N73VU - Jun 21, 02:20 UTCJun 21, 03:59 UTC1h 40m
2026-06-20 N73VU - Jun 20, 17:34 UTCJun 20, 17:59 UTC25m
2026-06-19 N73VU - Jun 19, 15:34 UTCJun 19, 16:29 UTC55m
2026-06-19 N73VU - Jun 19, 14:09 UTCJun 19, 14:39 UTC30m
2026-06-19 N73VU - Jun 19, 12:25 UTCJun 19, 13:20 UTC55m
2026-06-19 N73VU - Jun 19, 04:10 UTCJun 19, 05:59 UTC1h 50m
2026-06-18 N73VU - Jun 18, 23:35 UTCJun 19, 01:29 UTC1h 54m
2026-06-18 N73VU - Jun 18, 21:20 UTCJun 18, 22:15 UTC55m
2026-06-18 N73VU - Jun 18, 18:25 UTCJun 18, 19:15 UTC50m
2026-06-16 N73VU - Jun 16, 21:30 UTCJun 16, 22:05 UTC35m
2026-06-16 N73VU - Jun 16, 12:35 UTCJun 16, 13:19 UTC45m
2026-06-15 N73VU - Jun 15, 23:19 UTCJun 16, 01:19 UTC2h 0m
2026-06-15 N73VU - Jun 15, 21:30 UTCJun 15, 22:40 UTC1h 10m

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.

Mode-S A9CAA0 frequently asked

What is Mode-S code A9CAA0?
A9CAA0 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A9CAA0 registered?
Mode-S code A9CAA0 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 A9CAA0 broadcasting right now?
Yes. Mode-S A9CAA0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9CAA0, octal 52345240, decimal 11,127,456.
What flights does A9CAA0 operate?
Mode-S A9CAA0 has broadcast 1 distinct callsign, including N73VU.