Apparatus

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sensors Mode-S transponder

A13972

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1781T · CESSNA 172 Skyhawk · operated by FLIGHT OPERATIONS AIRCRAFT LLC

Hex
A13972
Octal
50234562
Decimal
10,566,002
Country
US
Tail
N1781T
Type
C172
No current signal · last broadcast 7d ago
Flights observed
102
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S A13972.

Country allocation

The ICAO 24-bit address A13972 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
CXK485 - 102 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-10 CXK485 PWK → SUS Jul 10, 11:50 UTCJul 10, 14:25 UTC2h 35m
2026-07-02 CXK485 - Jul 2, 18:50 UTCJul 2, 20:25 UTC1h 35m
2026-07-02 CXK485 - Jul 2, 17:20 UTCJul 2, 18:45 UTC1h 25m
2026-07-02 CXK485 - Jul 2, 15:20 UTCJul 2, 16:05 UTC45m
2026-07-02 CXK485 - Jul 2, 11:45 UTCJul 2, 13:30 UTC1h 45m
2026-07-01 CXK485 PWK → PWK Jul 1, 18:40 UTCJul 1, 19:10 UTC30m
2026-07-01 CXK485 PWK → PWK Jul 1, 16:05 UTCJul 1, 17:45 UTC1h 40m
2026-06-26 CXK485 - Jun 26, 15:29 UTCJun 26, 16:44 UTC1h 15m
2026-06-25 CXK485 - Jun 25, 17:54 UTCJun 25, 19:29 UTC1h 35m
2026-06-25 CXK485 - Jun 25, 14:50 UTCJun 25, 16:29 UTC1h 40m
2026-06-25 CXK485 PWK → PWK Jun 25, 13:09 UTCJun 25, 13:40 UTC30m
2026-06-23 CXK485 - Jun 23, 23:34 UTCJun 24, 01:44 UTC2h 10m
2026-06-23 CXK485 PWK → PWK Jun 23, 17:25 UTCJun 23, 20:40 UTC3h 15m
2026-06-23 CXK485 PWK → PWK Jun 23, 12:45 UTCJun 23, 13:39 UTC55m
2026-06-23 CXK485 - Jun 23, 01:04 UTCJun 23, 02:04 UTC1h 0m
2026-06-22 CXK485 PWK → PWK Jun 22, 22:10 UTCJun 22, 23:45 UTC1h 35m
2026-06-22 CXK485 PWK → PWK Jun 22, 19:05 UTCJun 22, 21:19 UTC2h 15m
2026-06-22 CXK485 - Jun 22, 17:00 UTCJun 22, 18:00 UTC1h 0m
2026-06-22 CXK485 - Jun 22, 15:59 UTCJun 22, 16:29 UTC30m
2026-06-22 CXK485 - Jun 22, 12:59 UTCJun 22, 13:59 UTC1h 0m
2026-06-20 CXK485 PWK → PWK Jun 20, 16:19 UTCJun 20, 17:59 UTC1h 40m
2026-06-19 CXK485 PWK → PWK Jun 19, 13:20 UTCJun 19, 14:19 UTC1h 0m
2026-06-19 CXK485 PWK → PWK Jun 19, 10:09 UTCJun 19, 10:29 UTC20m
2026-06-18 CXK485 - Jun 18, 20:15 UTCJun 18, 21:50 UTC1h 35m
2026-06-18 CXK485 - Jun 18, 17:30 UTCJun 18, 18:40 UTC1h 10m
2026-06-15 CXK485 - Jun 15, 20:30 UTCJun 15, 20:50 UTC20m
2026-06-15 CXK485 - Jun 15, 19:20 UTCJun 15, 20:00 UTC40m
2026-06-15 CXK485 PWK → PWK Jun 15, 11:34 UTCJun 15, 14:10 UTC2h 35m
2026-06-15 CXK485 PWK → PWK Jun 15, 09:49 UTCJun 15, 10:09 UTC20m
2026-06-14 CXK485 PWK → PWK Jun 14, 18:50 UTCJun 14, 20:20 UTC1h 30m
2026-06-13 CXK485 - Jun 13, 09:50 UTCJun 13, 13:05 UTC3h 15m
2026-06-12 CXK485 - Jun 12, 15:55 UTCJun 12, 17:35 UTC1h 40m
2026-06-12 CXK485 PWK → PWK Jun 12, 11:45 UTCJun 12, 12:10 UTC25m
2026-06-11 CXK485 - Jun 11, 15:40 UTCJun 11, 16:20 UTC40m
2026-06-11 CXK485 PWK → PWK Jun 11, 13:10 UTCJun 11, 13:40 UTC30m
2026-06-09 CXK485 - Jun 9, 20:30 UTCJun 9, 22:40 UTC2h 10m
2026-06-08 CXK485 - Jun 8, 13:20 UTCJun 8, 14:55 UTC1h 35m
2026-06-07 CXK485 PWK → PWK Jun 7, 18:35 UTCJun 7, 19:50 UTC1h 15m
2026-06-07 CXK485 PWK → PWK Jun 7, 15:30 UTCJun 7, 16:50 UTC1h 20m
2026-06-07 CXK485 - Jun 7, 00:55 UTCJun 7, 01:55 UTC1h 0m
2026-06-06 CXK485 - Jun 6, 19:30 UTCJun 6, 21:54 UTC2h 25m
2026-06-06 CXK485 - Jun 6, 17:10 UTCJun 6, 17:44 UTC35m
2026-06-04 CXK485 - Jun 4, 15:25 UTCJun 4, 16:55 UTC1h 30m
2026-06-04 CXK485 PWK → PWK Jun 4, 10:40 UTCJun 4, 12:20 UTC1h 40m
2026-06-04 CXK485 PWK → PWK Jun 4, 01:20 UTCJun 4, 02:25 UTC1h 5m
2026-06-03 CXK485 - Jun 3, 22:10 UTCJun 4, 00:10 UTC2h 0m
2026-06-03 CXK485 - Jun 3, 18:15 UTCJun 3, 19:40 UTC1h 25m
2026-06-03 CXK485 - Jun 3, 15:50 UTCJun 3, 17:15 UTC1h 25m
2026-06-03 CXK485 PWK → PWK Jun 3, 11:40 UTCJun 3, 13:20 UTC1h 40m
2026-06-03 CXK485 PWK → PWK Jun 3, 10:40 UTCJun 3, 11:00 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 N1781T page for operator, model, and routing details .

Mode-S A13972 frequently asked

What is Mode-S code A13972?
A13972 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1781T.
Where is Mode-S A13972 registered?
Mode-S code A13972 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 A13972 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A13972, octal 50234562, decimal 10,566,002.
What flights does A13972 operate?
Mode-S A13972 has broadcast 1 distinct callsign, including CXK485.