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sensors Mode-S transponder

A9A7FA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N721HH · ROBINSON R-22 Mariner · operated by HAWAII PACIFIC AVIATION INC

Hex
A9A7FA
Octal
52323772
Decimal
11,118,586
Country
US
Tail
N721HH
Type
R22
Broadcasting now · callsign N721HH · 450 ft
Flights observed
221
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 20:15 UTC

Current position

A9A7FA is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9A7FA 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
N721HH - 221 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N721HH KOA → KOA Jul 26, 19:15 UTCJul 26, 20:15 UTC1h 0m
2026-07-24 N721HH KOA → KOA Jul 24, 23:35 UTCJul 25, 00:30 UTC55m
2026-07-24 N721HH KOA → KOA Jul 24, 21:50 UTCJul 24, 22:30 UTC40m
2026-07-24 N721HH KOA → KOA Jul 24, 05:40 UTCJul 24, 06:25 UTC45m
2026-07-23 N721HH - Jul 23, 21:35 UTCJul 23, 22:20 UTC45m
2026-07-23 N721HH KOA → KOA Jul 23, 17:50 UTCJul 23, 18:40 UTC50m
2026-07-22 N721HH KOA → KOA Jul 22, 23:40 UTCJul 23, 00:40 UTC1h 0m
2026-07-22 N721HH KOA → KOA Jul 22, 19:35 UTCJul 22, 20:35 UTC1h 0m
2026-07-21 N721HH KOA → KOA Jul 21, 22:10 UTCJul 21, 23:00 UTC50m
2026-07-20 N721HH KOA → KOA Jul 20, 17:25 UTCJul 20, 17:55 UTC30m
2026-07-20 N721HH - Jul 20, 05:50 UTCJul 20, 06:30 UTC40m
2026-07-20 N721HH - Jul 20, 04:30 UTCJul 20, 04:50 UTC20m
2026-07-19 N721HH KOA → KOA Jul 19, 19:25 UTCJul 19, 20:15 UTC50m
2026-07-18 N721HH KOA → KOA Jul 18, 21:20 UTCJul 18, 21:30 UTC10m
2026-07-18 N721HH KOA → KOA Jul 18, 05:20 UTCJul 18, 05:50 UTC30m
2026-07-17 N721HH KOA → KOA Jul 17, 05:15 UTCJul 17, 06:29 UTC1h 15m
2026-07-16 N721HH KOA → KOA Jul 16, 03:20 UTCJul 16, 03:55 UTC35m
2026-07-16 N721HH KOA → KOA Jul 16, 01:40 UTCJul 16, 02:40 UTC1h 0m
2026-07-15 N721HH KOA → KOA Jul 15, 22:25 UTCJul 15, 22:50 UTC25m
2026-07-14 N721HH KOA → KOA Jul 14, 19:30 UTCJul 14, 20:20 UTC50m
2026-07-14 N721HH KOA → KOA Jul 14, 01:25 UTCJul 14, 02:05 UTC40m
2026-07-10 N721HH KOA → KOA Jul 10, 23:40 UTCJul 11, 00:35 UTC55m
2026-07-10 N721HH KOA → KOA Jul 10, 21:35 UTCJul 10, 22:15 UTC40m
2026-07-10 N721HH KOA → KOA Jul 10, 19:55 UTCJul 10, 20:30 UTC35m
2026-07-10 N721HH KOA → KOA Jul 10, 17:30 UTCJul 10, 18:20 UTC50m
2026-07-09 N721HH - Jul 9, 18:20 UTCJul 9, 18:45 UTC25m
2026-07-09 N721HH - Jul 9, 17:05 UTCJul 9, 17:15 UTC10m
2026-07-07 N721HH KOA → KOA Jul 7, 23:35 UTCJul 8, 00:35 UTC1h 0m
2026-07-07 N721HH KOA → KOA Jul 7, 01:35 UTCJul 7, 02:20 UTC45m
2026-07-02 N721HH KOA → KOA Jul 2, 23:40 UTCJul 3, 00:10 UTC30m
2026-07-02 N721HH KOA → KOA Jul 2, 21:55 UTCJul 2, 22:15 UTC20m
2026-07-02 N721HH KOA → KOA Jul 2, 19:20 UTCJul 2, 19:35 UTC15m
2026-07-02 N721HH KOA → KOA Jul 2, 01:30 UTCJul 2, 02:05 UTC35m
2026-07-01 N721HH KOA → KOA Jul 1, 22:10 UTCJul 1, 22:25 UTC15m
2026-07-01 N721HH KOA → KOA Jul 1, 21:35 UTCJul 1, 21:45 UTC10m
2026-07-01 N721HH KOA → KOA Jul 1, 19:30 UTCJul 1, 20:20 UTC50m
2026-07-01 N721HH KOA → KOA Jul 1, 17:30 UTCJul 1, 17:50 UTC20m
2026-07-01 N721HH KOA → KOA Jul 1, 00:00 UTCJul 1, 00:10 UTC10m
2026-06-30 N721HH KOA → KOA Jun 30, 19:15 UTCJun 30, 19:55 UTC40m
2026-06-30 N721HH KOA → KOA Jun 30, 05:40 UTCJun 30, 06:15 UTC35m
2026-06-29 N721HH KOA → KOA Jun 29, 21:50 UTCJun 29, 22:19 UTC30m
2026-06-28 N721HH KOA → KOA Jun 28, 19:59 UTCJun 28, 20:29 UTC30m
2026-06-28 N721HH - Jun 28, 17:34 UTCJun 28, 17:55 UTC20m
2026-06-28 N721HH - Jun 28, 16:05 UTCJun 28, 16:14 UTC10m
2026-06-28 N721HH KOA → KOA Jun 28, 03:35 UTCJun 28, 03:59 UTC25m
2026-06-27 N721HH KOA → KOA Jun 27, 16:30 UTCJun 27, 17:14 UTC45m
2026-06-26 N721HH KOA → KOA Jun 26, 22:14 UTCJun 26, 22:25 UTC10m
2026-06-26 N721HH KOA → KOA Jun 26, 21:24 UTCJun 26, 21:39 UTC15m
2026-06-26 N721HH KOA → KOA Jun 26, 03:00 UTCJun 26, 03:24 UTC25m
2026-06-26 N721HH KOA → KOA Jun 26, 01:39 UTCJun 26, 02:14 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 N721HH page for operator, model, and routing details .

Mode-S A9A7FA frequently asked

What is Mode-S code A9A7FA?
A9A7FA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N721HH.
Where is Mode-S A9A7FA registered?
Mode-S code A9A7FA 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 A9A7FA broadcasting right now?
Yes. Mode-S A9A7FA is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A7FA, octal 52323772, decimal 11,118,586.
What flights does A9A7FA operate?
Mode-S A9A7FA has broadcast 1 distinct callsign, including N721HH.