Apparatus

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sensors Mode-S transponder

A59663

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N4593Y · PIPER PA-25 Pawnee · operated by SOARING SOCIETY OF BOULDER

Hex
A59663
Octal
51313143
Decimal
10,851,939
Country
US
Tail
N4593Y
Type
PA25
No current signal · last broadcast Jul 26, 19:30 UTC
Flights observed
125
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 19:30 UTC

Last known position

Most recent position reported by Mode-S A59663.

Country allocation

The ICAO 24-bit address A59663 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
N4593Y - 125 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N4593Y WBU → WBU Jul 26, 17:45 UTCJul 26, 19:30 UTC1h 45m
2026-07-26 N4593Y WBU → WBU Jul 26, 16:00 UTCJul 26, 16:45 UTC45m
2026-07-25 N4593Y WBU → WBU Jul 25, 14:50 UTCJul 25, 19:10 UTC4h 20m
2026-07-23 N4593Y WBU → WBU Jul 23, 15:40 UTCJul 23, 18:30 UTC2h 50m
2026-07-22 N4593Y WBU → WBU Jul 22, 18:35 UTCJul 22, 19:25 UTC50m
2026-07-22 N4593Y WBU → WBU Jul 22, 15:55 UTCJul 22, 17:05 UTC1h 10m
2026-07-18 N4593Y WBU → WBU Jul 18, 18:15 UTCJul 18, 19:20 UTC1h 5m
2026-07-18 N4593Y WBU → WBU Jul 18, 15:45 UTCJul 18, 17:10 UTC1h 25m
2026-07-15 N4593Y - Jul 15, 19:35 UTCJul 15, 19:45 UTC10m
2026-07-15 N4593Y WBU → WBU Jul 15, 17:10 UTCJul 15, 19:05 UTC1h 55m
2026-07-15 N4593Y WBU → WBU Jul 15, 15:00 UTCJul 15, 16:35 UTC1h 35m
2026-07-14 N4593Y WBU → WBU Jul 14, 18:25 UTCJul 14, 19:25 UTC1h 0m
2026-07-13 N4593Y WBU → WBU Jul 13, 15:45 UTCJul 13, 16:50 UTC1h 5m
2026-07-12 N4593Y WBU → WBU Jul 12, 19:01 UTCJul 12, 20:40 UTC1h 40m
2026-07-11 N4593Y WBU → WBU Jul 11, 19:00 UTCJul 11, 19:25 UTC25m
2026-07-11 N4593Y WBU → WBU Jul 11, 16:55 UTCJul 11, 18:25 UTC1h 30m
2026-07-10 N4593Y WBU → WBU Jul 10, 19:35 UTCJul 10, 20:30 UTC55m
2026-07-10 N4593Y WBU → WBU Jul 10, 16:55 UTCJul 10, 17:45 UTC50m
2026-07-09 N4593Y WBU → WBU Jul 9, 16:00 UTCJul 9, 18:20 UTC2h 20m
2026-07-08 N4593Y WBU → WBU Jul 8, 15:50 UTCJul 8, 16:40 UTC50m
2026-07-06 N4593Y WBU → WBU Jul 6, 18:15 UTCJul 6, 20:10 UTC1h 55m
2026-07-06 N4593Y WBU → WBU Jul 6, 15:35 UTCJul 6, 17:25 UTC1h 50m
2026-07-05 N4593Y WBU → WBU Jul 5, 20:45 UTCJul 5, 21:15 UTC30m
2026-07-05 N4593Y WBU → WBU Jul 5, 16:10 UTCJul 5, 18:40 UTC2h 30m
2026-07-05 N4593Y WBU → WBU Jul 5, 15:15 UTCJul 5, 15:35 UTC20m
2026-07-04 N4593Y WBU → WBU Jul 4, 15:45 UTCJul 4, 17:30 UTC1h 45m
2026-07-03 N4593Y WBU → WBU Jul 3, 16:45 UTCJul 3, 20:10 UTC3h 25m
2026-07-02 N4593Y WBU → WBU Jul 2, 19:05 UTCJul 2, 20:30 UTC1h 25m
2026-07-02 N4593Y WBU → WBU Jul 2, 16:15 UTCJul 2, 16:50 UTC35m
2026-07-02 N4593Y WBU → WBU Jul 2, 14:45 UTCJul 2, 15:20 UTC35m
2026-07-01 N4593Y WBU → WBU Jul 1, 20:05 UTCJul 1, 20:45 UTC40m
2026-07-01 N4593Y WBU → WBU Jul 1, 18:05 UTCJul 1, 19:00 UTC55m
2026-07-01 N4593Y WBU → WBU Jul 1, 15:25 UTCJul 1, 17:30 UTC2h 5m
2026-06-30 N4593Y WBU → WBU Jun 30, 18:00 UTCJun 30, 19:10 UTC1h 10m
2026-06-30 N4593Y WBU → WBU Jun 30, 16:10 UTCJun 30, 17:15 UTC1h 5m
2026-06-28 N4593Y WBU → WBU Jun 28, 21:10 UTCJun 28, 21:34 UTC25m
2026-06-28 N4593Y WBU → WBU Jun 28, 18:55 UTCJun 28, 20:39 UTC1h 45m
2026-06-27 N4593Y WBU → WBU Jun 27, 18:39 UTCJun 27, 19:00 UTC20m
2026-06-27 N4593Y WBU → WBU Jun 27, 17:20 UTCJun 27, 17:59 UTC40m
2026-06-27 N4593Y WBU → WBU Jun 27, 15:10 UTCJun 27, 15:34 UTC25m
2026-06-26 N4593Y WBU → WBU Jun 26, 17:50 UTCJun 26, 20:00 UTC2h 10m
2026-06-22 N4593Y WBU → WBU Jun 22, 18:09 UTCJun 22, 18:49 UTC40m
2026-06-21 N4593Y WBU → WBU Jun 21, 16:39 UTCJun 21, 17:05 UTC25m
2026-06-20 N4593Y WBU → WBU Jun 20, 20:20 UTCJun 20, 20:40 UTC20m
2026-06-20 N4593Y WBU → WBU Jun 20, 16:34 UTCJun 20, 17:54 UTC1h 20m
2026-06-19 N4593Y WBU → WBU Jun 19, 19:25 UTCJun 19, 19:49 UTC25m
2026-06-18 N4593Y WBU → WBU Jun 18, 19:25 UTCJun 18, 20:00 UTC35m
2026-06-18 N4593Y WBU → WBU Jun 18, 18:00 UTCJun 18, 18:25 UTC25m
2026-06-18 N4593Y WBU → WBU Jun 18, 15:05 UTCJun 18, 15:55 UTC50m
2026-06-16 N4593Y WBU → WBU Jun 16, 15:50 UTCJun 16, 19:45 UTC3h 55m

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 N4593Y page for operator, model, and routing details .

Mode-S A59663 frequently asked

What is Mode-S code A59663?
A59663 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N4593Y.
Where is Mode-S A59663 registered?
Mode-S code A59663 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 A59663 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A59663, octal 51313143, decimal 10,851,939.
What flights does A59663 operate?
Mode-S A59663 has broadcast 1 distinct callsign, including N4593Y.