Apparatus

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sensors Mode-S transponder

A54EA7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N441DH · ROBINSON R-44 Raven · operated by DIRK HENDERSON LLC

Hex
A54EA7
Octal
51247247
Decimal
10,833,575
Country
US
Tail
N441DH
Type
R44
No current signal · last broadcast Jul 16, 20:00 UTC
Flights observed
40
Distinct callsigns
1
Country
US
Last broadcast
Jul 16, 20:00 UTC

Last known position

Most recent position reported by Mode-S A54EA7.

Country allocation

The ICAO 24-bit address A54EA7 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
N441DH - 40 2026-07-16

Recent flights last 40

DateFlightRouteTakeoffLandingDuration
2026-07-16 N441DH - Jul 16, 19:45 UTCJul 16, 20:00 UTC15m
2026-07-16 N441DH - Jul 16, 12:14 UTCJul 16, 12:34 UTC20m
2026-07-13 N441DH - Jul 13, 17:45 UTCJul 13, 18:05 UTC20m
2026-07-13 N441DH - Jul 13, 11:40 UTCJul 13, 12:45 UTC1h 5m
2026-07-11 N441DH - Jul 11, 15:45 UTCJul 11, 16:30 UTC45m
2026-07-09 N441DH - Jul 9, 17:30 UTCJul 9, 17:50 UTC20m
2026-07-09 N441DH - Jul 9, 13:35 UTCJul 9, 13:55 UTC20m
2026-07-08 N441DH - Jul 8, 18:45 UTCJul 8, 19:00 UTC15m
2026-07-08 N441DH - Jul 8, 11:15 UTCJul 8, 11:50 UTC35m
2026-07-06 N441DH - Jul 6, 19:30 UTCJul 6, 19:50 UTC20m
2026-07-06 N441DH - Jul 6, 17:55 UTCJul 6, 18:15 UTC20m
2026-07-05 N441DH - Jul 5, 21:50 UTCJul 5, 22:10 UTC20m
2026-06-30 N441DH - Jun 30, 20:20 UTCJun 30, 20:40 UTC20m
2026-06-26 N441DH - Jun 26, 12:29 UTCJun 26, 12:50 UTC20m
2026-06-01 N441DH - Jun 1, 16:10 UTCJun 1, 16:40 UTC30m
2026-06-01 N441DH - Jun 1, 13:00 UTCJun 1, 13:25 UTC25m
2026-05-20 N441DH - May 20, 18:40 UTCMay 20, 18:50 UTC10m
2026-05-20 N441DH - May 20, 14:25 UTCMay 20, 14:40 UTC15m
2026-04-28 N441DH - Apr 28, 15:45 UTCApr 28, 17:00 UTC1h 15m
2026-04-27 N441DH - Apr 27, 16:45 UTCApr 27, 17:00 UTC15m
2026-04-27 N441DH - Apr 27, 15:55 UTCApr 27, 16:10 UTC15m
2026-04-27 N441DH - Apr 27, 11:40 UTCApr 27, 12:25 UTC45m
2026-04-25 N441DH - Apr 25, 18:25 UTCApr 25, 18:35 UTC10m
2026-04-25 N441DH - Apr 25, 17:25 UTCApr 25, 17:40 UTC15m
2026-04-24 N441DH - Apr 24, 16:35 UTCApr 24, 17:55 UTC1h 20m
2026-04-23 N441DH - Apr 23, 20:40 UTCApr 23, 21:00 UTC20m
2026-04-23 N441DH - Apr 23, 19:50 UTCApr 23, 20:00 UTC10m
2026-04-22 N441DH - Apr 22, 15:50 UTCApr 22, 16:20 UTC30m
2026-04-22 N441DH - Apr 22, 13:25 UTCApr 22, 14:30 UTC1h 5m
2026-04-21 N441DH - Apr 21, 18:50 UTCApr 21, 19:20 UTC30m
2026-04-17 N441DH - Apr 17, 21:30 UTCApr 17, 22:00 UTC30m
2026-04-17 N441DH - Apr 17, 16:00 UTCApr 17, 16:15 UTC15m
2026-04-16 N441DH - Apr 16, 17:15 UTCApr 16, 18:30 UTC1h 15m
2026-04-16 N441DH - Apr 16, 16:40 UTCApr 16, 17:10 UTC30m
2026-04-15 N441DH - Apr 15, 17:55 UTCApr 15, 19:00 UTC1h 5m
2026-04-15 N441DH - Apr 15, 17:30 UTCApr 15, 17:40 UTC10m
2026-04-15 N441DH - Apr 15, 17:05 UTCApr 15, 17:20 UTC15m
2026-04-15 N441DH - Apr 15, 13:01 UTCApr 15, 13:15 UTC15m
2026-04-15 N441DH - Apr 15, 12:45 UTCApr 15, 12:55 UTC10m
2026-04-15 N441DH - Apr 15, 12:01 UTCApr 15, 12:10 UTC10m

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 N441DH page for operator, model, and routing details .

Mode-S A54EA7 frequently asked

What is Mode-S code A54EA7?
A54EA7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N441DH.
Where is Mode-S A54EA7 registered?
Mode-S code A54EA7 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 A54EA7 broadcasting right now?
No active broadcast right now. Last signal was Jul 16, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54EA7, octal 51247247, decimal 10,833,575.
What flights does A54EA7 operate?
Mode-S A54EA7 has broadcast 1 distinct callsign, including N441DH.