Apparatus

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sensors Mode-S transponder

A64D51

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N505JF · DIAMOND DA-40 Club Star · operated by KUHNEN AVIATORS 5JF LLC

Hex
A64D51
Octal
51446521
Decimal
10,898,769
Country
US
Tail
N505JF
Type
DA40
No current signal · last broadcast 1d ago
Flights observed
10
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A64D51.

Country allocation

The ICAO 24-bit address A64D51 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
N505JF - 10 2026-04-13

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-13 N505JF - Apr 13, 21:25 UTCApr 13, 23:05 UTC1h 40m
2026-04-13 N505JF - Apr 13, 19:50 UTCApr 13, 20:10 UTC20m
2026-04-13 N505JF APA → APA Apr 13, 18:40 UTCApr 13, 20:10 UTC1h 30m
2026-04-13 N505JF - Apr 13, 15:50 UTCApr 13, 16:10 UTC20m
2026-04-13 N505JF APA → APA Apr 13, 14:50 UTCApr 13, 16:10 UTC1h 20m
2026-04-13 N505JF - Apr 13, 04:00 UTCApr 13, 04:15 UTC15m
2026-04-13 N505JF - Apr 13, 03:10 UTCApr 13, 04:15 UTC1h 5m
2026-04-13 N505JF - Apr 13, 00:20 UTCApr 13, 00:30 UTC10m
2026-04-12 N505JF - Apr 12, 23:55 UTCApr 13, 00:30 UTC35m
2026-04-12 N505JF - Apr 12, 19:30 UTCApr 12, 20:15 UTC45m

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 N505JF page for operator, model, and routing details .

Mode-S A64D51 frequently asked

What is Mode-S code A64D51?
A64D51 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N505JF.
Where is Mode-S A64D51 registered?
Mode-S code A64D51 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 A64D51 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 A64D51, octal 51446521, decimal 10,898,769.
What flights does A64D51 operate?
Mode-S A64D51 has broadcast 1 distinct callsign, including N505JF.