Apparatus

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sensors Mode-S transponder

A6DC9E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N541LA · operated by TECNAM U S INC

Hex
A6DC9E
Octal
51556236
Decimal
10,935,454
Country
US
Tail
N541LA
No current signal · last broadcast 20h ago
Flights observed
116
Distinct callsigns
1
Country
US
Last broadcast
20h ago

Last known position

Most recent position reported by Mode-S A6DC9E.

Country allocation

The ICAO 24-bit address A6DC9E 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
N541LA - 116 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N541LA ROA → ROA Jul 13, 15:40 UTCJul 13, 16:20 UTC40m
2026-07-11 N541LA - Jul 11, 13:45 UTCJul 11, 13:55 UTC10m
2026-07-11 N541LA - Jul 11, 12:55 UTCJul 11, 13:05 UTC10m
2026-07-10 N541LA - Jul 10, 15:40 UTCJul 10, 16:30 UTC50m
2026-07-09 N541LA ROA → ROA Jul 9, 22:10 UTCJul 9, 23:00 UTC50m
2026-07-09 N541LA - Jul 9, 17:40 UTCJul 9, 18:20 UTC40m
2026-07-09 N541LA - Jul 9, 15:55 UTCJul 9, 16:25 UTC30m
2026-07-09 N541LA - Jul 9, 15:05 UTCJul 9, 15:20 UTC15m
2026-07-08 N541LA ROA → ROA Jul 8, 16:15 UTCJul 8, 16:45 UTC30m
2026-07-07 N541LA ROA → ROA Jul 7, 12:05 UTCJul 7, 12:25 UTC20m
2026-07-06 N541LA ROA → ROA Jul 6, 17:45 UTCJul 6, 18:35 UTC50m
2026-07-04 N541LA - Jul 4, 15:40 UTCJul 4, 16:15 UTC35m
2026-07-04 N541LA - Jul 4, 12:00 UTCJul 4, 13:05 UTC1h 5m
2026-07-03 N541LA - Jul 3, 13:25 UTCJul 3, 13:55 UTC30m
2026-07-02 N541LA ROA → ROA Jul 2, 23:10 UTCJul 2, 23:55 UTC45m
2026-07-02 N541LA - Jul 2, 15:40 UTCJul 2, 16:45 UTC1h 5m
2026-07-02 N541LA - Jul 2, 13:20 UTCJul 2, 13:35 UTC15m
2026-07-01 N541LA - Jul 1, 22:05 UTCJul 1, 22:40 UTC35m
2026-07-01 N541LA - Jul 1, 18:15 UTCJul 1, 18:25 UTC10m
2026-07-01 N541LA ROA → ROA Jul 1, 13:45 UTCJul 1, 14:30 UTC45m
2026-06-30 N541LA ROA → ROA Jun 30, 22:55 UTCJul 1, 00:00 UTC1h 5m
2026-06-30 N541LA ROA → ROA Jun 30, 14:25 UTCJun 30, 14:55 UTC30m
2026-06-29 N541LA - Jun 29, 15:39 UTCJun 29, 16:04 UTC25m
2026-06-27 N541LA ROA → ROA Jun 27, 18:29 UTCJun 27, 18:39 UTC10m
2026-06-25 N541LA ROA → ROA Jun 25, 14:09 UTCJun 25, 14:44 UTC35m
2026-06-24 N541LA - Jun 24, 23:00 UTCJun 24, 23:20 UTC20m
2026-06-24 N541LA - Jun 24, 22:14 UTCJun 24, 22:25 UTC10m
2026-06-24 N541LA - Jun 24, 20:14 UTCJun 24, 20:40 UTC25m
2026-06-24 N541LA - Jun 24, 17:50 UTCJun 24, 18:39 UTC50m
2026-06-24 N541LA - Jun 24, 15:00 UTCJun 24, 15:35 UTC35m
2026-06-24 N541LA - Jun 24, 13:54 UTCJun 24, 14:24 UTC30m
2026-06-23 N541LA ROA → ROA Jun 23, 22:34 UTCJun 23, 23:05 UTC30m
2026-06-23 N541LA ROA → ROA Jun 23, 12:49 UTCJun 23, 13:29 UTC40m
2026-06-22 N541LA - Jun 22, 17:40 UTCJun 22, 18:24 UTC45m
2026-06-22 N541LA - Jun 22, 15:59 UTCJun 22, 16:45 UTC45m
2026-06-22 N541LA - Jun 22, 14:05 UTCJun 22, 14:34 UTC30m
2026-06-21 N541LA ROA → ROA Jun 21, 18:54 UTCJun 21, 19:45 UTC50m
2026-06-21 N541LA - Jun 21, 16:54 UTCJun 21, 17:50 UTC55m
2026-06-20 N541LA - Jun 20, 21:44 UTCJun 20, 22:30 UTC45m
2026-06-20 N541LA ROA → ROA Jun 20, 15:54 UTCJun 20, 16:19 UTC25m
2026-06-20 N541LA ROA → ROA Jun 20, 14:09 UTCJun 20, 14:50 UTC40m
2026-06-19 N541LA - Jun 19, 18:14 UTCJun 19, 19:04 UTC50m
2026-06-17 N541LA - Jun 17, 12:45 UTCJun 17, 13:45 UTC1h 0m
2026-06-16 N541LA ROA → ROA Jun 16, 23:25 UTCJun 17, 00:25 UTC1h 0m
2026-06-16 N541LA - Jun 16, 21:20 UTCJun 16, 21:40 UTC20m
2026-06-16 N541LA - Jun 16, 19:55 UTCJun 16, 20:15 UTC20m
2026-06-16 N541LA - Jun 16, 16:45 UTCJun 16, 17:45 UTC1h 0m
2026-06-15 N541LA ROA → ROA Jun 15, 18:55 UTCJun 15, 19:45 UTC50m
2026-06-15 N541LA ROA → ROA Jun 15, 15:45 UTCJun 15, 16:35 UTC50m
2026-06-12 N541LA - Jun 12, 15:05 UTCJun 12, 16:00 UTC55m

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 N541LA page for operator, model, and routing details .

Mode-S A6DC9E frequently asked

What is Mode-S code A6DC9E?
A6DC9E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N541LA.
Where is Mode-S A6DC9E registered?
Mode-S code A6DC9E 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 A6DC9E broadcasting right now?
No active broadcast right now. Last signal was 20h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6DC9E, octal 51556236, decimal 10,935,454.
What flights does A6DC9E operate?
Mode-S A6DC9E has broadcast 1 distinct callsign, including N541LA.