Apparatus

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sensors Mode-S transponder

A6504E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N506AV · operated by WESTWIND SCHOOL OF AERONAUTICS PHOENIX LLC DBA, UNITED AVIATE ACADEMY (A DELAWARE LLC)

Hex
A6504E
Octal
51450116
Decimal
10,899,534
Country
US
Tail
N506AV
Type
SR20
No current signal · last broadcast 23d ago
Flights observed
42
Distinct callsigns
1
Country
US
Last broadcast
23d ago

Last known position

Most recent position reported by Mode-S A6504E.

Country allocation

The ICAO 24-bit address A6504E 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
VAR506 - 42 2026-07-23

Recent flights last 42

DateFlightRouteTakeoffLandingDuration
2026-07-23 VAR506 GYR → GYR Jul 23, 03:45 UTCJul 23, 05:10 UTC1h 25m
2026-07-23 VAR506 GYR → GYR Jul 23, 00:30 UTCJul 23, 01:25 UTC55m
2026-07-22 VAR506 GYR → GYR Jul 22, 20:40 UTCJul 22, 22:15 UTC1h 35m
2026-07-22 VAR506 GYR → GYR Jul 22, 17:05 UTCJul 22, 18:25 UTC1h 20m
2026-07-22 VAR506 GYR → GYR Jul 22, 00:00 UTCJul 22, 00:55 UTC55m
2026-07-21 VAR506 GYR → GYR Jul 21, 19:50 UTCJul 21, 22:15 UTC2h 25m
2026-07-21 VAR506 GYR → GYR Jul 21, 17:05 UTCJul 21, 18:35 UTC1h 30m
2026-07-20 VAR506 GYR → GYR Jul 20, 15:25 UTCJul 20, 16:30 UTC1h 5m
2026-07-20 VAR506 - Jul 20, 01:10 UTCJul 20, 02:40 UTC1h 30m
2026-07-19 VAR506 - Jul 19, 23:25 UTCJul 20, 00:35 UTC1h 10m
2026-07-19 VAR506 GYR → GYR Jul 19, 20:10 UTCJul 19, 20:40 UTC30m
2026-07-19 VAR506 GYR → GYR Jul 19, 17:20 UTCJul 19, 18:35 UTC1h 15m
2026-07-19 VAR506 GYR → GYR Jul 19, 14:20 UTCJul 19, 16:00 UTC1h 40m
2026-07-18 VAR506 GYR → GYR Jul 18, 23:40 UTCJul 19, 02:15 UTC2h 35m
2026-07-18 VAR506 GYR → GYR Jul 18, 20:35 UTCJul 18, 22:05 UTC1h 30m
2026-07-18 VAR506 GYR → GYR Jul 18, 00:45 UTCJul 18, 02:00 UTC1h 15m
2026-07-17 VAR506 GYR → GYR Jul 17, 21:00 UTCJul 17, 22:40 UTC1h 40m
2026-07-17 VAR506 GYR → GYR Jul 17, 03:45 UTCJul 17, 04:10 UTC25m
2026-07-16 VAR506 GYR → GYR Jul 16, 19:55 UTCJul 16, 22:19 UTC2h 25m
2026-07-16 VAR506 GYR → GYR Jul 16, 16:25 UTCJul 16, 18:55 UTC2h 30m
2026-07-15 VAR506 GYR → GYR Jul 15, 22:15 UTCJul 15, 22:30 UTC15m
2026-07-15 VAR506 GYR → GYR Jul 15, 18:55 UTCJul 15, 21:10 UTC2h 15m
2026-07-15 VAR506 GYR → GYR Jul 15, 16:30 UTCJul 15, 17:50 UTC1h 20m
2026-07-15 VAR506 - Jul 15, 14:25 UTCJul 15, 14:30 UTC5m
2026-07-15 VAR506 GYR → GYR Jul 15, 14:10 UTCJul 15, 14:15 UTC5m
2026-07-15 VAR506 - Jul 15, 01:05 UTCJul 15, 01:15 UTC10m
2026-07-14 VAR506 GYR → GYR Jul 14, 23:10 UTCJul 15, 00:55 UTC1h 45m
2026-07-14 VAR506 GYR → GYR Jul 14, 18:50 UTCJul 14, 20:15 UTC1h 25m
2026-07-14 VAR506 GYR → GYR Jul 14, 14:40 UTCJul 14, 17:00 UTC2h 20m
2026-07-11 VAR506 GYR → GYR Jul 11, 16:45 UTCJul 11, 18:45 UTC2h 0m
2026-07-09 VAR506 GYR → GYR Jul 9, 17:50 UTCJul 9, 19:20 UTC1h 30m
2026-07-08 VAR506 GYR → GYR Jul 8, 20:20 UTCJul 8, 21:10 UTC50m
2026-07-08 VAR506 GYR → GYR Jul 8, 17:25 UTCJul 8, 18:55 UTC1h 30m
2026-07-07 VAR506 GYR → GYR Jul 7, 23:15 UTCJul 8, 00:30 UTC1h 15m
2026-07-07 VAR506 GYR → GYR Jul 7, 16:50 UTCJul 7, 18:25 UTC1h 35m
2026-07-06 VAR506 - Jul 6, 15:10 UTCJul 6, 17:10 UTC2h 0m
2026-07-05 VAR506 - Jul 5, 16:35 UTCJul 5, 17:10 UTC35m
2026-07-05 VAR506 - Jul 5, 15:50 UTCJul 5, 16:25 UTC35m
2026-07-05 VAR506 GYR → GYR Jul 5, 14:55 UTCJul 5, 15:30 UTC35m
2026-05-03 VAR506 GYR → GYR May 3, 14:55 UTCMay 3, 16:20 UTC1h 25m
2026-04-30 VAR506 VGT → GYR Apr 30, 20:30 UTCApr 30, 22:30 UTC2h 0m
2026-04-22 VAR506 VGT → VGT Apr 22, 15:50 UTCApr 22, 16:25 UTC35m

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 N506AV page for operator, model, and routing details .

Mode-S A6504E frequently asked

What is Mode-S code A6504E?
A6504E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N506AV.
Where is Mode-S A6504E registered?
Mode-S code A6504E 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 A6504E 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 A6504E, octal 51450116, decimal 10,899,534.
What flights does A6504E operate?
Mode-S A6504E has broadcast 1 distinct callsign, including VAR506.