Apparatus

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sensors Mode-S transponder

A54EAD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N441DP · CESSNA 172 Skyhawk · operated by RHINELANDER FLYING SERVICE INC

Hex
A54EAD
Octal
51247255
Decimal
10,833,581
Country
US
Tail
N441DP
Type
C172
No current signal · last broadcast 23d ago
Flights observed
85
Distinct callsigns
1
Country
US
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S A54EAD.

Country allocation

The ICAO 24-bit address A54EAD 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
N441DP - 85 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-27 N441DP AUW → AUW Jun 27, 19:55 UTCJun 27, 20:09 UTC15m
2026-06-27 N441DP AUW → AUW Jun 27, 19:09 UTCJun 27, 19:19 UTC10m
2026-06-27 N441DP - Jun 27, 17:20 UTCJun 27, 18:24 UTC1h 5m
2026-06-26 N441DP - Jun 26, 15:20 UTCJun 26, 15:29 UTC10m
2026-06-26 N441DP AUW → AUW Jun 26, 02:54 UTCJun 26, 03:15 UTC20m
2026-06-25 N441DP AUW → AUW Jun 25, 23:14 UTCJun 26, 00:10 UTC55m
2026-06-23 N441DP AUW → AUW Jun 23, 22:05 UTCJun 23, 22:34 UTC30m
2026-06-23 N441DP AUW → AUW Jun 23, 17:54 UTCJun 23, 18:20 UTC25m
2026-06-23 N441DP AUW → AUW Jun 23, 15:04 UTCJun 23, 15:44 UTC40m
2026-06-22 N441DP - Jun 22, 15:24 UTCJun 22, 15:45 UTC20m
2026-06-22 N441DP - Jun 22, 14:14 UTCJun 22, 14:40 UTC25m
2026-06-21 N441DP AUW → AUW Jun 21, 15:15 UTCJun 21, 15:40 UTC25m
2026-06-19 N441DP - Jun 19, 17:39 UTCJun 19, 18:25 UTC45m
2026-06-19 N441DP - Jun 19, 15:59 UTCJun 19, 16:29 UTC30m
2026-06-19 N441DP AUW → AUW Jun 19, 13:39 UTCJun 19, 14:19 UTC40m
2026-06-18 N441DP AUW → AUW Jun 18, 22:45 UTCJun 18, 22:55 UTC10m
2026-06-18 N441DP - Jun 18, 13:25 UTCJun 18, 13:55 UTC30m
2026-06-16 N441DP AUW → AUW Jun 16, 23:45 UTCJun 17, 00:45 UTC1h 0m
2026-06-16 N441DP AUW → AUW Jun 16, 16:20 UTCJun 16, 17:15 UTC55m
2026-06-16 N441DP - Jun 16, 13:09 UTCJun 16, 14:00 UTC50m
2026-06-15 N441DP - Jun 15, 23:04 UTCJun 15, 23:35 UTC30m
2026-06-15 N441DP CLI → AUW Jun 15, 14:10 UTCJun 15, 16:15 UTC2h 5m
2026-06-15 N441DP CLI → CLI Jun 15, 12:25 UTCJun 15, 13:20 UTC55m
2026-06-15 N441DP AUW → CLI Jun 15, 11:24 UTCJun 15, 11:49 UTC25m
2026-06-14 N441DP AUW → AUW Jun 14, 19:00 UTCJun 14, 19:50 UTC50m
2026-06-14 N441DP - Jun 14, 17:35 UTCJun 14, 18:20 UTC45m
2026-06-14 N441DP AUW → AUW Jun 14, 14:55 UTCJun 14, 16:25 UTC1h 30m
2026-06-14 N441DP AUW → AUW Jun 14, 13:45 UTCJun 14, 14:25 UTC40m
2026-06-13 N441DP - Jun 13, 17:35 UTCJun 13, 18:10 UTC35m
2026-06-11 N441DP - Jun 11, 18:05 UTCJun 11, 18:55 UTC50m
2026-06-11 N441DP AUW → AUW Jun 11, 13:40 UTCJun 11, 13:55 UTC15m
2026-06-10 N441DP AUW → AUW Jun 10, 16:25 UTCJun 10, 16:40 UTC15m
2026-06-09 N441DP AUW → AUW Jun 9, 22:10 UTCJun 9, 22:50 UTC40m
2026-06-07 N441DP AUW → AUW Jun 7, 22:25 UTCJun 7, 23:30 UTC1h 5m
2026-06-07 N441DP AUW → AUW Jun 7, 14:35 UTCJun 7, 16:25 UTC1h 50m
2026-06-04 N441DP - Jun 4, 18:30 UTCJun 4, 19:35 UTC1h 5m
2026-06-04 N441DP AUW → AUW Jun 4, 15:25 UTCJun 4, 15:55 UTC30m
2026-06-04 N441DP AUW → AUW Jun 4, 13:25 UTCJun 4, 14:45 UTC1h 20m
2026-06-03 N441DP - Jun 3, 22:35 UTCJun 3, 22:55 UTC20m
2026-06-03 N441DP - Jun 3, 17:45 UTCJun 3, 18:05 UTC20m
2026-06-03 N441DP - Jun 3, 14:00 UTCJun 3, 14:35 UTC35m
2026-06-02 N441DP AUW → AUW Jun 2, 15:10 UTCJun 2, 16:10 UTC1h 0m
2026-06-01 N441DP - Jun 1, 17:55 UTCJun 1, 18:25 UTC30m
2026-06-01 N441DP - Jun 1, 16:50 UTCJun 1, 17:20 UTC30m
2026-06-01 N441DP - Jun 1, 12:40 UTCJun 1, 13:30 UTC50m
2026-05-29 N441DP - May 29, 18:55 UTCMay 29, 20:25 UTC1h 30m
2026-05-29 N441DP AUW → OSH May 29, 12:55 UTCMay 29, 13:45 UTC50m
2026-05-28 N441DP AUW → AUW May 28, 22:40 UTCMay 28, 23:20 UTC40m
2026-05-27 N441DP - May 27, 19:50 UTCMay 27, 20:35 UTC45m
2026-05-27 N441DP - May 27, 15:25 UTCMay 27, 15:35 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 N441DP page for operator, model, and routing details .

Mode-S A54EAD frequently asked

What is Mode-S code A54EAD?
A54EAD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N441DP.
Where is Mode-S A54EAD registered?
Mode-S code A54EAD 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 A54EAD broadcasting right now?
No active broadcast right now. Last signal was 23d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54EAD, octal 51247255, decimal 10,833,581.
What flights does A54EAD operate?
Mode-S A54EAD has broadcast 1 distinct callsign, including N441DP.