Apparatus

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sensors Mode-S transponder

A54904

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N44HS · operated by TTFN LLC

Hex
A54904
Octal
51244404
Decimal
10,832,132
Country
US
Tail
N44HS
Type
S22T
No current signal · last broadcast 1d ago
Flights observed
45
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A54904.

Country allocation

The ICAO 24-bit address A54904 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
N44HS - 45 2026-07-16

Recent flights last 45

DateFlightRouteTakeoffLandingDuration
2026-07-16 N44HS - Jul 16, 00:40 UTCJul 16, 01:10 UTC30m
2026-07-15 N44HS SQV → CLS Jul 15, 19:35 UTCJul 15, 20:20 UTC45m
2026-07-15 N44HS - Jul 15, 17:05 UTCJul 15, 17:40 UTC35m
2026-07-10 N44HS - Jul 10, 19:20 UTCJul 10, 20:00 UTC40m
2026-07-10 N44HS - Jul 10, 17:15 UTCJul 10, 17:45 UTC30m
2026-07-08 N44HS - Jul 8, 16:00 UTCJul 8, 16:40 UTC40m
2026-07-08 N44HS - Jul 8, 13:50 UTCJul 8, 14:40 UTC50m
2026-07-02 N44HS - Jul 2, 18:20 UTCJul 2, 18:55 UTC35m
2026-07-02 N44HS - Jul 2, 15:40 UTCJul 2, 16:25 UTC45m
2026-07-01 N44HS - Jul 1, 17:45 UTCJul 1, 18:25 UTC40m
2026-07-01 N44HS - Jul 1, 14:55 UTCJul 1, 15:40 UTC45m
2026-06-30 N44HS - Jun 30, 14:45 UTCJun 30, 15:20 UTC35m
2026-06-30 N44HS CLM → SQV Jun 30, 13:05 UTCJun 30, 13:15 UTC10m
2026-06-30 N44HS - Jun 30, 12:15 UTCJun 30, 13:00 UTC45m
2026-06-25 N44HS - Jun 25, 20:59 UTCJun 25, 21:40 UTC40m
2026-06-25 N44HS - Jun 25, 18:34 UTCJun 25, 19:24 UTC50m
2026-06-24 N44HS - Jun 24, 17:55 UTCJun 24, 18:34 UTC40m
2026-06-24 N44HS - Jun 24, 15:14 UTCJun 24, 16:24 UTC1h 10m
2026-06-24 N44HS - Jun 24, 12:50 UTCJun 24, 13:24 UTC35m
2026-06-23 N44HS - Jun 23, 21:14 UTCJun 23, 21:49 UTC35m
2026-06-23 N44HS - Jun 23, 18:45 UTCJun 23, 19:34 UTC50m
2026-06-23 N44HS - Jun 23, 15:24 UTCJun 23, 15:50 UTC25m
2026-06-19 N44HS - Jun 19, 18:59 UTCJun 19, 19:14 UTC15m
2026-06-19 N44HS - Jun 19, 15:29 UTCJun 19, 16:04 UTC35m
2026-06-19 N44HS - Jun 19, 12:09 UTCJun 19, 12:44 UTC35m
2026-06-18 N44HS SQV → CLS Jun 18, 17:40 UTCJun 18, 18:20 UTC40m
2026-06-18 N44HS - Jun 18, 13:45 UTCJun 18, 14:25 UTC40m
2026-06-17 N44HS - Jun 17, 19:05 UTCJun 17, 19:45 UTC40m
2026-06-17 N44HS - Jun 17, 14:05 UTCJun 17, 14:40 UTC35m
2026-06-16 N44HS - Jun 16, 20:45 UTCJun 16, 21:20 UTC35m
2026-06-16 N44HS - Jun 16, 18:20 UTCJun 16, 18:55 UTC35m
2026-06-15 N44HS - Jun 15, 16:40 UTCJun 15, 17:15 UTC35m
2026-06-15 N44HS - Jun 15, 13:50 UTCJun 15, 14:24 UTC35m
2026-06-11 N44HS - Jun 11, 18:15 UTCJun 11, 19:25 UTC1h 10m
2026-06-11 N44HS - Jun 11, 15:00 UTCJun 11, 16:00 UTC1h 0m
2026-05-22 N44HS - May 22, 19:25 UTCMay 22, 20:20 UTC55m
2026-05-22 N44HS - May 22, 16:05 UTCMay 22, 17:00 UTC55m
2026-05-21 N44HS - May 21, 18:35 UTCMay 21, 19:35 UTC1h 0m
2026-05-21 N44HS - May 21, 15:50 UTCMay 21, 16:45 UTC55m
2026-05-20 N44HS CLS → CLS May 20, 22:45 UTCMay 20, 22:55 UTC10m
2026-04-16 N44HS - Apr 16, 21:30 UTCApr 16, 22:15 UTC45m
2026-04-16 N44HS - Apr 16, 19:15 UTCApr 16, 19:45 UTC30m
2026-04-16 N44HS - Apr 16, 18:45 UTCApr 16, 19:10 UTC25m
2026-04-15 N44HS - Apr 15, 19:05 UTCApr 15, 19:15 UTC10m
2026-04-15 N44HS - Apr 15, 18:30 UTCApr 15, 19:00 UTC30m

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 N44HS page for operator, model, and routing details .

Mode-S A54904 frequently asked

What is Mode-S code A54904?
A54904 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N44HS.
Where is Mode-S A54904 registered?
Mode-S code A54904 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 A54904 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54904, octal 51244404, decimal 10,832,132.
What flights does A54904 operate?
Mode-S A54904 has broadcast 1 distinct callsign, including N44HS.