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sensors Mode-S transponder

A9DD71

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73481 · CESSNA 172 Skyhawk · operated by N73481 LLC

Hex
A9DD71
Octal
52356561
Decimal
11,132,273
Country
US
Tail
N73481
Type
C172
Broadcasting now · callsign N73481 · 7,100 ft
Flights observed
106
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Current position

A9DD71 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9DD71 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
N73481 - 106 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N73481 - Jul 13, 13:10 UTCJul 13, 14:35 UTC1h 25m
2026-07-11 N73481 - Jul 11, 14:10 UTCJul 11, 15:35 UTC1h 25m
2026-07-10 N73481 - Jul 10, 17:30 UTCJul 10, 18:25 UTC55m
2026-07-07 N73481 - Jul 7, 15:30 UTCJul 7, 17:20 UTC1h 50m
2026-07-04 N73481 GXY → GXY Jul 4, 16:20 UTCJul 4, 18:00 UTC1h 40m
2026-07-04 N73481 - Jul 4, 13:40 UTCJul 4, 15:35 UTC1h 55m
2026-07-01 N73481 - Jul 1, 23:55 UTCJul 2, 00:10 UTC15m
2026-07-01 N73481 - Jul 1, 21:55 UTCJul 1, 22:25 UTC30m
2026-06-30 N73481 GXY → GXY Jun 30, 18:05 UTCJun 30, 19:30 UTC1h 25m
2026-06-30 N73481 - Jun 30, 16:25 UTCJun 30, 17:05 UTC40m
2026-06-30 N73481 - Jun 30, 14:25 UTCJun 30, 14:45 UTC20m
2026-06-29 N73481 - Jun 29, 22:19 UTCJun 29, 22:55 UTC35m
2026-06-29 N73481 - Jun 29, 20:59 UTCJun 29, 21:24 UTC25m
2026-06-28 N73481 GXY → GXY Jun 28, 14:34 UTCJun 28, 15:14 UTC40m
2026-06-27 N73481 - Jun 27, 03:55 UTCJun 27, 06:19 UTC2h 25m
2026-06-23 N73481 - Jun 23, 16:35 UTCJun 23, 17:54 UTC1h 20m
2026-06-23 N73481 - Jun 23, 14:59 UTCJun 23, 15:24 UTC25m
2026-06-23 N73481 - Jun 23, 13:19 UTCJun 23, 13:45 UTC25m
2026-06-22 N73481 - Jun 22, 12:54 UTCJun 22, 14:40 UTC1h 45m
2026-06-20 N73481 - Jun 20, 18:24 UTCJun 20, 19:04 UTC40m
2026-06-20 N73481 - Jun 20, 15:49 UTCJun 20, 17:10 UTC1h 20m
2026-06-18 N73481 - Jun 18, 18:25 UTCJun 18, 18:45 UTC20m
2026-06-18 N73481 - Jun 18, 16:30 UTCJun 18, 16:55 UTC25m
2026-06-17 N73481 - Jun 17, 15:10 UTCJun 17, 15:35 UTC25m
2026-06-17 N73481 - Jun 17, 13:45 UTCJun 17, 14:05 UTC20m
2026-06-16 N73481 - Jun 16, 17:35 UTCJun 16, 18:20 UTC45m
2026-06-16 N73481 - Jun 16, 13:40 UTCJun 16, 14:20 UTC40m
2026-06-15 N73481 - Jun 15, 22:05 UTCJun 15, 22:30 UTC25m
2026-06-15 N73481 - Jun 15, 19:10 UTCJun 15, 19:45 UTC35m
2026-06-15 N73481 - Jun 15, 16:45 UTCJun 15, 17:59 UTC1h 15m
2026-06-15 N73481 - Jun 15, 14:05 UTCJun 15, 15:19 UTC1h 15m
2026-06-12 N73481 - Jun 12, 13:25 UTCJun 12, 14:15 UTC50m
2026-06-10 N73481 GXY → GXY Jun 10, 18:45 UTCJun 10, 19:55 UTC1h 10m
2026-06-10 N73481 - Jun 10, 16:40 UTCJun 10, 17:30 UTC50m
2026-06-10 N73481 GXY → GXY Jun 10, 13:30 UTCJun 10, 14:45 UTC1h 15m
2026-06-09 N73481 - Jun 9, 13:25 UTCJun 9, 14:55 UTC1h 30m
2026-06-08 N73481 GXY → GXY Jun 8, 16:05 UTCJun 8, 17:35 UTC1h 30m
2026-06-08 N73481 GXY → GXY Jun 8, 13:25 UTCJun 8, 14:55 UTC1h 30m
2026-06-06 N73481 GXY → GXY Jun 6, 13:20 UTCJun 6, 14:34 UTC1h 15m
2026-06-05 N73481 - Jun 5, 13:30 UTCJun 5, 14:20 UTC50m
2026-06-04 N73481 GXY → GXY Jun 4, 19:10 UTCJun 4, 20:20 UTC1h 10m
2026-06-04 N73481 GXY → GXY Jun 4, 17:05 UTCJun 4, 17:40 UTC35m
2026-06-04 N73481 GXY → GXY Jun 4, 13:30 UTCJun 4, 14:40 UTC1h 10m
2026-06-03 N73481 - Jun 3, 13:05 UTCJun 3, 14:05 UTC1h 0m
2026-06-02 N73481 - Jun 2, 14:25 UTCJun 2, 15:20 UTC55m
2026-06-01 N73481 - Jun 1, 16:20 UTCJun 1, 17:15 UTC55m
2026-06-01 N73481 GXY → GXY Jun 1, 13:40 UTCJun 1, 14:45 UTC1h 5m
2026-05-31 N73481 - May 31, 21:20 UTCMay 31, 22:15 UTC55m
2026-05-31 N73481 GXY → GXY May 31, 18:15 UTCMay 31, 19:50 UTC1h 35m
2026-05-27 N73481 GXY → GXY May 27, 20:45 UTCMay 27, 21:05 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 N73481 page for operator, model, and routing details .

Mode-S A9DD71 frequently asked

What is Mode-S code A9DD71?
A9DD71 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73481.
Where is Mode-S A9DD71 registered?
Mode-S code A9DD71 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 A9DD71 broadcasting right now?
Yes. Mode-S A9DD71 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9DD71, octal 52356561, decimal 11,132,273.
What flights does A9DD71 operate?
Mode-S A9DD71 has broadcast 1 distinct callsign, including N73481.