Apparatus

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sensors Mode-S transponder

A231B9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N240TS · DIAMOND DA-42 Guardian · operated by UTAH STATE UNIVERSITY

Hex
A231B9
Octal
50430671
Decimal
10,629,561
Country
US
Tail
N240TS
Type
DA42
Broadcasting now · callsign N240TS · 9,525 ft
Flights observed
95
Distinct callsigns
1
Country
US
Last broadcast
39m ago

Current position

A231B9 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A231B9 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
N240TS - 95 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N240TS - Jul 14, 19:50 UTCJul 14, 20:15 UTC25m
2026-07-14 N240TS LGU → LGU Jul 14, 17:20 UTCJul 14, 18:30 UTC1h 10m
2026-07-14 N240TS LGU → LGU Jul 14, 01:25 UTCJul 14, 02:40 UTC1h 15m
2026-07-13 N240TS - Jul 13, 19:10 UTCJul 13, 20:00 UTC50m
2026-07-13 N240TS LGU → LGU Jul 13, 17:40 UTCJul 13, 18:25 UTC45m
2026-07-11 N240TS LGU → LGU Jul 11, 16:50 UTCJul 11, 17:55 UTC1h 5m
2026-07-11 N240TS LGU → LGU Jul 11, 00:35 UTCJul 11, 01:25 UTC50m
2026-07-10 N240TS LGU → LGU Jul 10, 19:30 UTCJul 10, 20:30 UTC1h 0m
2026-07-09 N240TS LGU → LGU Jul 9, 22:35 UTCJul 9, 23:55 UTC1h 20m
2026-07-07 N240TS - Jul 7, 14:30 UTCJul 7, 15:45 UTC1h 15m
2026-07-06 N240TS LGU → LGU Jul 6, 20:25 UTCJul 6, 21:15 UTC50m
2026-07-03 N240TS LGU → LGU Jul 3, 18:10 UTCJul 3, 18:25 UTC15m
2026-07-02 N240TS LGU → LGU Jul 2, 20:35 UTCJul 2, 21:15 UTC40m
2026-07-02 N240TS LGU → LGU Jul 2, 16:40 UTCJul 2, 17:45 UTC1h 5m
2026-06-30 N240TS LGU → LGU Jun 30, 19:30 UTCJun 30, 20:35 UTC1h 5m
2026-06-30 N240TS - Jun 30, 01:45 UTCJun 30, 02:35 UTC50m
2026-06-29 N240TS LGU → LGU Jun 29, 23:49 UTCJun 30, 01:09 UTC1h 20m
2026-06-29 N240TS LGU → LGU Jun 29, 21:54 UTCJun 29, 22:59 UTC1h 5m
2026-06-29 N240TS LGU → LGU Jun 29, 19:44 UTCJun 29, 20:59 UTC1h 15m
2026-06-28 N240TS LGU → LGU Jun 28, 20:54 UTCJun 28, 21:59 UTC1h 5m
2026-06-26 N240TS LGU → LGU Jun 26, 16:44 UTCJun 26, 18:09 UTC1h 25m
2026-06-24 N240TS LGU → LGU Jun 24, 22:35 UTCJun 24, 23:29 UTC55m
2026-06-22 N240TS LGU → LGU Jun 22, 22:30 UTCJun 22, 23:24 UTC55m
2026-06-22 N240TS LGU → LGU Jun 22, 20:00 UTCJun 22, 21:00 UTC1h 0m
2026-06-22 N240TS LGU → LGU Jun 22, 18:24 UTCJun 22, 19:05 UTC40m
2026-06-19 N240TS LGU → LGU Jun 19, 18:34 UTCJun 19, 19:19 UTC45m
2026-06-19 N240TS - Jun 19, 16:04 UTCJun 19, 17:09 UTC1h 5m
2026-06-19 N240TS LGU → LGU Jun 19, 01:29 UTCJun 19, 02:14 UTC45m
2026-06-17 N240TS - Jun 17, 19:20 UTCJun 17, 20:40 UTC1h 20m
2026-06-16 N240TS - Jun 16, 19:00 UTCJun 16, 19:05 UTC5m
2026-06-16 N240TS LGU → LGU Jun 16, 18:09 UTCJun 16, 18:55 UTC45m
2026-06-16 N240TS LGU → LGU Jun 16, 16:45 UTCJun 16, 17:24 UTC40m
2026-06-08 N240TS LGU → LGU Jun 8, 18:50 UTCJun 8, 19:55 UTC1h 5m
2026-06-05 N240TS LGU → LGU Jun 5, 22:30 UTCJun 5, 23:35 UTC1h 5m
2026-06-05 N240TS LGU → LGU Jun 5, 20:30 UTCJun 5, 21:25 UTC55m
2026-06-05 N240TS LGU → LGU Jun 5, 16:35 UTCJun 5, 17:35 UTC1h 0m
2026-06-04 N240TS LGU → LGU Jun 4, 22:40 UTCJun 4, 23:55 UTC1h 15m
2026-06-04 N240TS LGU → LGU Jun 4, 19:35 UTCJun 4, 21:05 UTC1h 30m
2026-06-04 N240TS LGU → LGU Jun 4, 17:15 UTCJun 4, 18:05 UTC50m
2026-06-02 N240TS - Jun 2, 20:50 UTCJun 2, 21:10 UTC20m
2026-06-02 N240TS - Jun 2, 20:10 UTCJun 2, 20:15 UTC5m
2026-06-01 N240TS LGU → LGU Jun 1, 22:40 UTCJun 1, 23:30 UTC50m
2026-06-01 N240TS LGU → LGU Jun 1, 17:05 UTCJun 1, 17:40 UTC35m
2026-05-31 N240TS LGU → LGU May 31, 21:45 UTCMay 31, 23:05 UTC1h 20m
2026-05-29 N240TS LGU → LGU May 29, 22:05 UTCMay 29, 22:50 UTC45m
2026-05-29 N240TS LGU → LGU May 29, 17:50 UTCMay 29, 18:50 UTC1h 0m
2026-05-29 N240TS LGU → LGU May 29, 01:20 UTCMay 29, 02:05 UTC45m
2026-05-28 N240TS LGU → LGU May 28, 22:20 UTCMay 28, 23:35 UTC1h 15m
2026-05-28 N240TS LGU → LGU May 28, 20:15 UTCMay 28, 21:05 UTC50m
2026-05-28 N240TS LGU → LGU May 28, 17:00 UTCMay 28, 18:05 UTC1h 5m

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 N240TS page for operator, model, and routing details .

Mode-S A231B9 frequently asked

What is Mode-S code A231B9?
A231B9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N240TS.
Where is Mode-S A231B9 registered?
Mode-S code A231B9 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 A231B9 broadcasting right now?
Yes. Mode-S A231B9 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A231B9, octal 50430671, decimal 10,629,561.
What flights does A231B9 operate?
Mode-S A231B9 has broadcast 1 distinct callsign, including N240TS.