Apparatus

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sensors Mode-S transponder

A9B423

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N724TT · operated by AERO SUMMIT LLC

Hex
A9B423
Octal
52332043
Decimal
11,121,699
Country
US
Tail
N724TT
Type
SR20
No current signal · last broadcast 2d ago
Flights observed
70
Distinct callsigns
1
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A9B423.

Country allocation

The ICAO 24-bit address A9B423 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
N724TT - 70 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 N724TT SMO → SMO Jun 1, 00:35 UTCJun 1, 00:40 UTC5m
2026-05-28 N724TT SBA → SMO May 28, 22:05 UTCMay 28, 22:50 UTC45m
2026-05-28 N724TT - May 28, 21:10 UTCMay 28, 21:55 UTC45m
2026-05-22 N724TT SMO → SMO May 22, 20:00 UTCMay 22, 20:05 UTC5m
2026-05-22 N724TT - May 22, 19:45 UTCMay 22, 19:55 UTC10m
2026-05-22 N724TT - May 22, 19:30 UTCMay 22, 19:40 UTC10m
2026-05-22 N724TT SMO → SMO May 22, 18:55 UTCMay 22, 19:25 UTC30m
2026-05-22 N724TT SMO → SMO May 22, 15:50 UTCMay 22, 16:15 UTC25m
2026-05-16 N724TT - May 16, 00:00 UTCMay 16, 00:55 UTC55m
2026-05-15 N724TT - May 15, 21:20 UTCMay 15, 22:40 UTC1h 20m
2026-05-13 N724TT - May 13, 17:50 UTCMay 13, 18:50 UTC1h 0m
2026-05-13 N724TT SMO → EMT May 13, 17:00 UTCMay 13, 17:20 UTC20m
2026-05-12 N724TT SMO → SMO May 12, 20:01 UTCMay 12, 21:55 UTC1h 55m
2026-05-11 N724TT SMO → SMO May 11, 20:15 UTCMay 11, 22:35 UTC2h 19m
2026-05-10 N724TT SMO → SMO May 10, 21:40 UTCMay 10, 22:40 UTC1h 0m
2026-05-10 N724TT - May 10, 17:34 UTCMay 10, 17:55 UTC20m
2026-05-10 N724TT SMO → CNO May 10, 16:10 UTCMay 10, 16:59 UTC50m
2026-05-09 N724TT SMO → SMO May 9, 20:00 UTCMay 9, 22:39 UTC2h 40m
2026-05-08 N724TT SMO → SMO May 8, 18:45 UTCMay 8, 20:45 UTC2h 0m
2026-05-07 N724TT HII → SMO May 7, 22:50 UTCMay 8, 00:49 UTC2h 0m
2026-05-07 N724TT SMO → HII May 7, 19:30 UTCMay 7, 21:20 UTC1h 50m
2026-05-07 N724TT SMO → SMO May 7, 17:10 UTCMay 7, 18:45 UTC1h 35m
2026-05-06 N724TT - May 6, 22:55 UTCMay 7, 00:15 UTC1h 20m
2026-05-06 N724TT SMO → SBP May 6, 20:25 UTCMay 6, 21:25 UTC1h 0m
2026-05-06 N724TT - May 6, 18:10 UTCMay 6, 19:05 UTC55m
2026-05-06 N724TT - May 6, 16:15 UTCMay 6, 17:30 UTC1h 15m
2026-05-05 N724TT SMO → SMO May 5, 16:55 UTCMay 5, 18:35 UTC1h 40m
2026-05-04 N724TT SMO → SMO May 4, 19:55 UTCMay 4, 21:35 UTC1h 40m
2026-05-04 N724TT SMO → SMO May 4, 15:25 UTCMay 4, 16:45 UTC1h 20m
2026-05-04 N724TT - May 4, 01:24 UTCMay 4, 02:39 UTC1h 15m
2026-05-03 N724TT SMO → SBP May 3, 22:15 UTCMay 3, 23:25 UTC1h 10m
2026-05-03 N724TT SBD → SMO May 3, 00:10 UTCMay 3, 00:45 UTC35m
2026-05-02 N724TT SMO → SBD May 2, 22:30 UTCMay 2, 23:10 UTC40m
2026-05-02 N724TT SMO → SMO May 2, 18:25 UTCMay 2, 19:50 UTC1h 25m
2026-05-02 N724TT SMO → SMO May 2, 00:15 UTCMay 2, 02:00 UTC1h 45m
2026-04-30 N724TT SMO → SMO Apr 30, 23:05 UTCMay 1, 00:45 UTC1h 40m
2026-04-30 N724TT - Apr 30, 16:35 UTCApr 30, 17:00 UTC25m
2026-04-30 N724TT - Apr 30, 14:55 UTCApr 30, 15:20 UTC25m
2026-04-29 N724TT SMO → SMO Apr 29, 21:45 UTCApr 29, 22:30 UTC45m
2026-04-29 N724TT SMO → SMO Apr 29, 17:05 UTCApr 29, 18:45 UTC1h 40m
2026-04-27 N724TT SMO → SMO Apr 27, 18:55 UTCApr 27, 20:50 UTC1h 55m
2026-04-25 N724TT - Apr 25, 02:00 UTCApr 25, 02:25 UTC25m
2026-04-24 N724TT - Apr 24, 22:15 UTCApr 24, 22:45 UTC30m
2026-04-24 N724TT - Apr 24, 20:30 UTCApr 24, 20:55 UTC25m
2026-04-24 N724TT SMO → SMO Apr 24, 19:35 UTCApr 24, 20:20 UTC45m
2026-04-23 N724TT SMO → SMO Apr 23, 21:55 UTCApr 23, 22:25 UTC30m
2026-04-22 N724TT SMO → SMO Apr 22, 23:50 UTCApr 23, 00:45 UTC55m
2026-04-22 N724TT SMO → SMO Apr 22, 20:40 UTCApr 22, 22:45 UTC2h 5m
2026-04-20 N724TT SMO → SMO Apr 20, 19:15 UTCApr 20, 20:40 UTC1h 25m
2026-04-20 N724TT SMO → SMO Apr 20, 01:45 UTCApr 20, 01:50 UTC5m

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 N724TT page for operator, model, and routing details .

Mode-S A9B423 frequently asked

What is Mode-S code A9B423?
A9B423 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N724TT.
Where is Mode-S A9B423 registered?
Mode-S code A9B423 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 A9B423 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9B423, octal 52332043, decimal 11,121,699.
What flights does A9B423 operate?
Mode-S A9B423 has broadcast 1 distinct callsign, including N724TT.