Apparatus

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sensors Mode-S transponder

A9DD0A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73453 · CESSNA 172 Skyhawk · operated by MFA LLC

Hex
A9DD0A
Octal
52356412
Decimal
11,132,170
Country
US
Tail
N73453
Type
C172
No current signal · last broadcast 5h ago
Flights observed
125
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A9DD0A.

Country allocation

The ICAO 24-bit address A9DD0A 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
N73453 - 125 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-01 N73453 - Jul 1, 17:35 UTCJul 1, 17:45 UTC10m
2026-07-01 N73453 - Jul 1, 12:45 UTCJul 1, 13:45 UTC1h 0m
2026-06-29 N73453 - Jun 29, 21:54 UTCJun 29, 22:44 UTC50m
2026-06-29 N73453 - Jun 29, 12:00 UTCJun 29, 12:24 UTC25m
2026-06-27 N73453 - Jun 27, 19:39 UTCJun 27, 19:55 UTC15m
2026-06-27 N73453 - Jun 27, 12:50 UTCJun 27, 13:09 UTC20m
2026-06-26 N73453 - Jun 26, 16:05 UTCJun 26, 16:49 UTC45m
2026-06-25 N73453 - Jun 25, 19:29 UTCJun 25, 19:39 UTC10m
2026-06-25 N73453 - Jun 25, 15:15 UTCJun 25, 15:29 UTC15m
2026-06-24 N73453 - Jun 24, 15:24 UTCJun 24, 16:24 UTC1h 0m
2026-06-22 N73453 - Jun 22, 18:35 UTCJun 22, 19:00 UTC25m
2026-06-20 N73453 - Jun 20, 19:44 UTCJun 20, 20:20 UTC35m
2026-06-20 N73453 - Jun 20, 16:44 UTCJun 20, 17:29 UTC45m
2026-06-19 N73453 - Jun 19, 21:49 UTCJun 19, 23:04 UTC1h 15m
2026-06-18 N73453 - Jun 18, 13:25 UTCJun 18, 13:40 UTC15m
2026-06-10 N73453 - Jun 10, 16:30 UTCJun 10, 16:55 UTC25m
2026-06-09 N73453 - Jun 9, 16:45 UTCJun 9, 18:45 UTC2h 0m
2026-06-09 N73453 - Jun 9, 01:15 UTCJun 9, 02:05 UTC50m
2026-06-08 N73453 - Jun 8, 21:45 UTCJun 8, 22:50 UTC1h 5m
2026-06-07 N73453 - Jun 7, 17:05 UTCJun 7, 17:25 UTC20m
2026-06-07 N73453 - Jun 7, 16:25 UTCJun 7, 16:35 UTC10m
2026-06-05 N73453 - Jun 5, 21:35 UTCJun 5, 22:55 UTC1h 20m
2026-06-03 N73453 - Jun 3, 18:45 UTCJun 3, 19:55 UTC1h 10m
2026-05-30 N73453 - May 30, 15:45 UTCMay 30, 16:30 UTC45m
2026-05-30 N73453 - May 30, 13:00 UTCMay 30, 13:40 UTC40m
2026-05-29 N73453 - May 29, 20:00 UTCMay 29, 20:30 UTC30m
2026-05-29 N73453 - May 29, 14:35 UTCMay 29, 15:15 UTC40m
2026-05-29 N73453 - May 29, 13:40 UTCMay 29, 13:50 UTC10m
2026-05-29 N73453 - May 29, 12:15 UTCMay 29, 12:25 UTC10m
2026-05-28 N73453 - May 28, 15:55 UTCMay 28, 16:30 UTC35m
2026-05-28 N73453 - May 28, 11:55 UTCMay 28, 12:30 UTC35m
2026-05-26 N73453 - May 26, 21:25 UTCMay 26, 21:59 UTC35m
2026-05-26 N73453 - May 26, 15:14 UTCMay 26, 15:45 UTC30m
2026-05-26 N73453 - May 26, 13:15 UTCMay 26, 13:34 UTC20m
2026-05-25 N73453 - May 25, 22:25 UTCMay 25, 23:04 UTC40m
2026-05-25 N73453 - May 25, 12:05 UTCMay 25, 12:50 UTC45m
2026-05-24 N73453 - May 24, 12:45 UTCMay 24, 13:15 UTC30m
2026-05-23 N73453 - May 23, 20:50 UTCMay 23, 21:15 UTC25m
2026-05-23 N73453 - May 23, 13:45 UTCMay 23, 14:25 UTC40m
2026-05-22 N73453 - May 22, 22:45 UTCMay 22, 23:30 UTC45m
2026-05-22 N73453 - May 22, 20:25 UTCMay 22, 20:50 UTC25m
2026-05-22 N73453 - May 22, 18:35 UTCMay 22, 18:45 UTC10m
2026-05-22 N73453 - May 22, 13:05 UTCMay 22, 13:30 UTC25m
2026-05-22 N73453 - May 22, 00:45 UTCMay 22, 02:10 UTC1h 25m
2026-05-21 N73453 - May 21, 21:40 UTCMay 21, 22:00 UTC20m
2026-05-21 N73453 - May 21, 19:10 UTCMay 21, 19:30 UTC20m
2026-05-21 N73453 - May 21, 13:20 UTCMay 21, 13:55 UTC35m
2026-05-20 N73453 - May 20, 20:10 UTCMay 20, 20:50 UTC40m
2026-05-20 N73453 - May 20, 18:05 UTCMay 20, 18:55 UTC50m
2026-05-20 N73453 - May 20, 13:10 UTCMay 20, 13:35 UTC25m

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 N73453 page for operator, model, and routing details .

Mode-S A9DD0A frequently asked

What is Mode-S code A9DD0A?
A9DD0A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73453.
Where is Mode-S A9DD0A registered?
Mode-S code A9DD0A 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 A9DD0A broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9DD0A, octal 52356412, decimal 11,132,170.
What flights does A9DD0A operate?
Mode-S A9DD0A has broadcast 1 distinct callsign, including N73453.