Apparatus

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sensors Mode-S transponder

A54DB6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4405T · PIPER PA-28-140/150/160/180 · operated by HOSTESS CITY AVIATORS INC

Hex
A54DB6
Octal
51246666
Decimal
10,833,334
Country
US
Tail
N4405T
Type
P28A
No current signal · last broadcast 14h ago
Flights observed
154
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A54DB6.

Country allocation

The ICAO 24-bit address A54DB6 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
N4405T - 154 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 N4405T SAV → SAV Jul 17, 19:55 UTCJul 17, 21:44 UTC1h 50m
2026-07-17 N4405T SAV → SAV Jul 17, 12:45 UTCJul 17, 13:40 UTC55m
2026-07-16 N4405T SAV → SAV Jul 16, 01:25 UTCJul 16, 02:00 UTC35m
2026-07-13 N4405T - Jul 13, 16:35 UTCJul 13, 17:15 UTC40m
2026-07-13 N4405T - Jul 13, 15:20 UTCJul 13, 16:00 UTC40m
2026-07-10 N4405T - Jul 10, 18:00 UTCJul 10, 18:10 UTC10m
2026-07-10 N4405T SAV → BQK Jul 10, 16:40 UTCJul 10, 17:25 UTC45m
2026-07-09 N4405T - Jul 9, 21:20 UTCJul 9, 23:10 UTC1h 50m
2026-07-08 N4405T - Jul 8, 21:55 UTCJul 8, 23:00 UTC1h 5m
2026-07-08 N4405T SAV → SAV Jul 8, 17:05 UTCJul 8, 18:20 UTC1h 15m
2026-07-08 N4405T - Jul 8, 15:30 UTCJul 8, 15:40 UTC10m
2026-07-08 N4405T - Jul 8, 14:15 UTCJul 8, 14:25 UTC10m
2026-07-07 N4405T - Jul 7, 20:30 UTCJul 7, 22:15 UTC1h 45m
2026-07-06 N4405T - Jul 6, 15:20 UTCJul 6, 15:30 UTC10m
2026-07-06 N4405T - Jul 6, 14:00 UTCJul 6, 14:40 UTC40m
2026-07-05 N4405T - Jul 5, 12:45 UTCJul 5, 13:25 UTC40m
2026-07-05 N4405T - Jul 5, 01:20 UTCJul 5, 02:15 UTC55m
2026-07-03 N4405T - Jul 3, 20:10 UTCJul 3, 21:50 UTC1h 40m
2026-07-03 N4405T - Jul 3, 11:40 UTCJul 3, 13:00 UTC1h 20m
2026-07-02 N4405T - Jul 2, 21:05 UTCJul 2, 21:25 UTC20m
2026-07-02 N4405T - Jul 2, 20:00 UTCJul 2, 20:15 UTC15m
2026-07-02 N4405T - Jul 2, 14:25 UTCJul 2, 15:15 UTC50m
2026-07-02 N4405T - Jul 2, 11:20 UTCJul 2, 13:00 UTC1h 40m
2026-07-02 N4405T - Jul 2, 00:35 UTCJul 2, 01:20 UTC45m
2026-07-01 N4405T - Jul 1, 20:40 UTCJul 1, 21:45 UTC1h 5m
2026-07-01 N4405T - Jul 1, 17:45 UTCJul 1, 17:55 UTC10m
2026-07-01 N4405T - Jul 1, 14:20 UTCJul 1, 15:45 UTC1h 25m
2026-06-30 N4405T - Jun 30, 20:20 UTCJun 30, 20:40 UTC20m
2026-06-30 N4405T - Jun 30, 18:55 UTCJun 30, 19:50 UTC55m
2026-06-30 N4405T - Jun 30, 12:05 UTCJun 30, 13:25 UTC1h 20m
2026-06-28 N4405T - Jun 28, 13:00 UTCJun 28, 14:25 UTC1h 25m
2026-06-27 N4405T - Jun 27, 19:00 UTCJun 27, 19:15 UTC15m
2026-06-26 N4405T - Jun 26, 17:15 UTCJun 26, 17:44 UTC30m
2026-06-25 N4405T - Jun 25, 21:29 UTCJun 25, 21:55 UTC25m
2026-06-25 N4405T - Jun 25, 17:09 UTCJun 25, 19:05 UTC1h 55m
2026-06-25 N4405T - Jun 25, 14:34 UTCJun 25, 14:44 UTC10m
2026-06-23 N4405T - Jun 23, 21:54 UTCJun 23, 22:10 UTC15m
2026-06-23 N4405T - Jun 23, 20:10 UTCJun 23, 20:24 UTC15m
2026-06-23 N4405T - Jun 23, 13:24 UTCJun 23, 14:55 UTC1h 30m
2026-06-22 N4405T - Jun 22, 15:54 UTCJun 22, 16:05 UTC10m
2026-06-20 N4405T - Jun 20, 19:04 UTCJun 20, 19:15 UTC10m
2026-06-20 N4405T - Jun 20, 17:49 UTCJun 20, 17:59 UTC10m
2026-06-16 N4405T - Jun 16, 13:34 UTCJun 16, 15:45 UTC2h 10m
2026-06-15 N4405T - Jun 15, 21:04 UTCJun 15, 22:25 UTC1h 20m
2026-06-15 N4405T - Jun 15, 14:20 UTCJun 15, 16:35 UTC2h 15m
2026-06-12 N4405T - Jun 12, 15:10 UTCJun 12, 16:20 UTC1h 10m
2026-06-11 N4405T - Jun 11, 23:25 UTCJun 12, 01:55 UTC2h 31m
2026-06-11 N4405T - Jun 11, 17:55 UTCJun 11, 20:40 UTC2h 45m
2026-06-10 N4405T SAV → SAV Jun 10, 20:35 UTCJun 10, 22:10 UTC1h 35m
2026-06-10 N4405T SAV → SAV Jun 10, 17:15 UTCJun 10, 18:55 UTC1h 40m

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 N4405T page for operator, model, and routing details .

Mode-S A54DB6 frequently asked

What is Mode-S code A54DB6?
A54DB6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4405T.
Where is Mode-S A54DB6 registered?
Mode-S code A54DB6 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 A54DB6 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54DB6, octal 51246666, decimal 10,833,334.
What flights does A54DB6 operate?
Mode-S A54DB6 has broadcast 1 distinct callsign, including N4405T.