Apparatus

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sensors Mode-S transponder

A239AD

ICAO 24-bit transponder address · allocated to United States

Hex
A239AD
Octal
50434655
Decimal
10,631,597
Country
US
No current signal · last broadcast 19h ago
Flights observed
99
Distinct callsigns
1
Country
US
Last broadcast
19h ago

Last known position

Most recent position reported by Mode-S A239AD.

Country allocation

The ICAO 24-bit address A239AD 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
N242ZA - 99 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 N242ZA - Jul 20, 16:10 UTCJul 20, 16:35 UTC25m
2026-07-20 N242ZA - Jul 20, 14:05 UTCJul 20, 15:05 UTC1h 0m
2026-07-20 N242ZA - Jul 20, 12:15 UTCJul 20, 13:20 UTC1h 5m
2026-07-19 N242ZA - Jul 19, 20:15 UTCJul 19, 20:25 UTC10m
2026-07-19 N242ZA - Jul 19, 17:05 UTCJul 19, 18:20 UTC1h 15m
2026-07-19 N242ZA - Jul 19, 15:00 UTCJul 19, 16:05 UTC1h 5m
2026-07-18 N242ZA - Jul 18, 14:50 UTCJul 18, 15:10 UTC20m
2026-07-18 N242ZA - Jul 18, 12:45 UTCJul 18, 13:30 UTC45m
2026-07-18 N242ZA - Jul 18, 11:10 UTCJul 18, 11:40 UTC30m
2026-07-17 N242ZA TPA → OPF Jul 17, 15:10 UTCJul 17, 17:05 UTC1h 55m
2026-07-17 N242ZA - Jul 17, 13:15 UTCJul 17, 14:04 UTC50m
2026-07-16 N242ZA - Jul 16, 12:49 UTCJul 16, 13:20 UTC30m
2026-07-16 N242ZA - Jul 16, 10:00 UTCJul 16, 12:05 UTC2h 5m
2026-07-12 N242ZA - Jul 12, 20:45 UTCJul 12, 22:25 UTC1h 40m
2026-07-12 N242ZA - Jul 12, 19:01 UTCJul 12, 19:25 UTC25m
2026-07-12 N242ZA - Jul 12, 14:05 UTCJul 12, 15:35 UTC1h 30m
2026-07-12 N242ZA - Jul 12, 12:25 UTCJul 12, 12:55 UTC30m
2026-07-05 N242ZA - Jul 5, 23:15 UTCJul 5, 23:25 UTC10m
2026-07-05 N242ZA - Jul 5, 21:20 UTCJul 5, 22:00 UTC40m
2026-07-05 N242ZA - Jul 5, 15:30 UTCJul 5, 16:30 UTC1h 0m
2026-07-05 N242ZA - Jul 5, 13:20 UTCJul 5, 13:50 UTC30m
2026-07-04 N242ZA - Jul 4, 14:00 UTCJul 4, 14:20 UTC20m
2026-07-04 N242ZA - Jul 4, 11:50 UTCJul 4, 12:25 UTC35m
2026-07-02 N242ZA - Jul 2, 16:00 UTCJul 2, 16:25 UTC25m
2026-07-02 N242ZA - Jul 2, 13:55 UTCJul 2, 14:25 UTC30m
2026-07-02 N242ZA - Jul 2, 12:35 UTCJul 2, 12:55 UTC20m
2026-07-01 N242ZA - Jul 1, 17:30 UTCJul 1, 19:40 UTC2h 10m
2026-07-01 N242ZA - Jul 1, 12:50 UTCJul 1, 14:10 UTC1h 20m
2026-07-01 N242ZA - Jul 1, 11:40 UTCJul 1, 11:55 UTC15m
2026-06-29 N242ZA - Jun 29, 21:30 UTCJun 29, 23:39 UTC2h 10m
2026-06-29 N242ZA - Jun 29, 17:59 UTCJun 29, 20:04 UTC2h 5m
2026-06-29 N242ZA - Jun 29, 16:29 UTCJun 29, 16:50 UTC20m
2026-06-29 N242ZA - Jun 29, 14:34 UTCJun 29, 15:24 UTC50m
2026-06-29 N242ZA - Jun 29, 12:45 UTCJun 29, 13:09 UTC25m
2026-06-28 N242ZA - Jun 28, 21:20 UTCJun 28, 21:34 UTC15m
2026-06-28 N242ZA - Jun 28, 19:09 UTCJun 28, 19:40 UTC30m
2026-06-25 N242ZA - Jun 25, 14:09 UTCJun 25, 14:24 UTC15m
2026-06-25 N242ZA - Jun 25, 12:30 UTCJun 25, 13:00 UTC30m
2026-06-24 N242ZA - Jun 24, 22:04 UTCJun 24, 22:55 UTC50m
2026-06-24 N242ZA - Jun 24, 20:35 UTCJun 24, 21:29 UTC55m
2026-06-24 N242ZA - Jun 24, 15:00 UTCJun 24, 16:45 UTC1h 45m
2026-06-24 N242ZA - Jun 24, 10:55 UTCJun 24, 11:29 UTC35m
2026-06-23 N242ZA - Jun 23, 21:24 UTCJun 23, 21:45 UTC20m
2026-06-23 N242ZA - Jun 23, 19:55 UTCJun 23, 20:24 UTC30m
2026-06-23 N242ZA - Jun 23, 13:15 UTCJun 23, 13:50 UTC35m
2026-06-23 N242ZA - Jun 23, 11:49 UTCJun 23, 12:09 UTC20m
2026-06-22 N242ZA - Jun 22, 19:14 UTCJun 22, 20:24 UTC1h 10m
2026-06-22 N242ZA - Jun 22, 16:29 UTCJun 22, 17:29 UTC1h 0m
2026-06-21 N242ZA - Jun 21, 19:34 UTCJun 21, 20:00 UTC25m
2026-06-21 N242ZA - Jun 21, 17:39 UTCJun 21, 18:29 UTC50m

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 A239AD frequently asked

What is Mode-S code A239AD?
A239AD is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A239AD registered?
Mode-S code A239AD 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 A239AD broadcasting right now?
No active broadcast right now. Last signal was 19h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A239AD, octal 50434655, decimal 10,631,597.
What flights does A239AD operate?
Mode-S A239AD has broadcast 1 distinct callsign, including N242ZA.