Apparatus

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sensors Mode-S transponder

A4B7DA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N403AV · operated by WESTWIND SCHOOL OF AERONAUTICS PHOENIX LLC DBA, UNITED AVIATE ACADEMY

Hex
A4B7DA
Octal
51133732
Decimal
10,794,970
Country
US
Tail
N403AV
Type
SR20
No current signal · last broadcast 7d ago
Flights observed
259
Distinct callsigns
1
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S A4B7DA.

Country allocation

The ICAO 24-bit address A4B7DA 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
VAR403 - 259 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 VAR403 GYR → GYR Jul 11, 16:50 UTCJul 11, 18:05 UTC1h 15m
2026-07-10 VAR403 GYR → GYR Jul 10, 23:10 UTCJul 11, 00:40 UTC1h 30m
2026-07-10 VAR403 GYR → GYR Jul 10, 17:20 UTCJul 10, 18:50 UTC1h 30m
2026-07-10 VAR403 - Jul 10, 05:10 UTCJul 10, 05:55 UTC45m
2026-07-09 VAR403 - Jul 9, 23:05 UTCJul 9, 23:50 UTC45m
2026-07-09 VAR403 - Jul 9, 19:30 UTCJul 9, 21:30 UTC2h 0m
2026-07-09 VAR403 - Jul 9, 17:10 UTCJul 9, 18:00 UTC50m
2026-07-09 VAR403 - Jul 9, 16:05 UTCJul 9, 16:35 UTC30m
2026-07-09 VAR403 BXK → GYR Jul 9, 14:20 UTCJul 9, 15:05 UTC45m
2026-07-09 VAR403 BXK → BXK Jul 9, 14:05 UTCJul 9, 14:15 UTC10m
2026-07-09 VAR403 GYR → BXK Jul 9, 13:40 UTCJul 9, 14:00 UTC20m
2026-07-09 VAR403 GYR → GYR Jul 9, 00:50 UTCJul 9, 02:25 UTC1h 35m
2026-07-08 VAR403 GYR → GYR Jul 8, 19:35 UTCJul 8, 22:40 UTC3h 5m
2026-07-08 VAR403 GYR → GYR Jul 8, 17:00 UTCJul 8, 18:15 UTC1h 15m
2026-07-08 VAR403 GYR → GYR Jul 8, 14:00 UTCJul 8, 15:45 UTC1h 45m
2026-07-07 VAR403 - Jul 7, 23:00 UTCJul 8, 00:50 UTC1h 50m
2026-07-07 VAR403 GYR → GYR Jul 7, 19:25 UTCJul 7, 20:45 UTC1h 20m
2026-07-07 VAR403 GYR → GYR Jul 7, 15:15 UTCJul 7, 17:20 UTC2h 5m
2026-07-05 VAR403 GYR → GYR Jul 5, 23:35 UTCJul 6, 01:30 UTC1h 55m
2026-07-05 VAR403 GYR → GYR Jul 5, 20:45 UTCJul 5, 22:35 UTC1h 50m
2026-07-05 VAR403 GYR → GYR Jul 5, 16:15 UTCJul 5, 17:40 UTC1h 25m
2026-07-02 VAR403 GYR → GYR Jul 2, 20:20 UTCJul 2, 21:50 UTC1h 30m
2026-07-02 VAR403 GYR → GYR Jul 2, 14:55 UTCJul 2, 17:40 UTC2h 45m
2026-07-01 VAR403 - Jul 1, 21:05 UTCJul 1, 22:35 UTC1h 30m
2026-07-01 VAR403 GYR → GYR Jul 1, 20:30 UTCJul 1, 20:40 UTC10m
2026-06-30 VAR403 - Jun 30, 20:10 UTCJun 30, 21:10 UTC1h 0m
2026-06-30 VAR403 - Jun 30, 18:35 UTCJun 30, 19:25 UTC50m
2026-06-24 VAR403 - Jun 24, 16:40 UTCJun 24, 17:34 UTC55m
2026-06-24 VAR403 - Jun 24, 14:39 UTCJun 24, 15:54 UTC1h 15m
2026-06-23 VAR403 GYR → GYR Jun 23, 20:04 UTCJun 23, 21:24 UTC1h 20m
2026-06-23 VAR403 GYR → GYR Jun 23, 17:20 UTCJun 23, 18:34 UTC1h 15m
2026-06-21 VAR403 GYR → GYR Jun 21, 19:14 UTCJun 21, 20:45 UTC1h 30m
2026-06-21 VAR403 - Jun 21, 04:14 UTCJun 21, 05:04 UTC50m
2026-06-21 VAR403 - Jun 21, 01:49 UTCJun 21, 02:40 UTC50m
2026-06-21 VAR403 - Jun 21, 00:29 UTCJun 21, 01:14 UTC45m
2026-06-20 VAR403 GYR → GYR Jun 20, 21:44 UTCJun 20, 22:59 UTC1h 15m
2026-06-20 VAR403 - Jun 20, 17:49 UTCJun 20, 18:49 UTC1h 0m
2026-06-20 VAR403 GYR → BXK Jun 20, 16:00 UTCJun 20, 16:59 UTC1h 0m
2026-06-20 VAR403 GYR → GYR Jun 20, 03:54 UTCJun 20, 05:59 UTC2h 5m
2026-06-19 VAR403 GYR → GYR Jun 19, 23:34 UTCJun 20, 01:19 UTC1h 45m
2026-06-19 VAR403 - Jun 19, 19:54 UTCJun 19, 21:04 UTC1h 10m
2026-06-19 VAR403 - Jun 19, 15:49 UTCJun 19, 17:24 UTC1h 35m
2026-06-19 VAR403 GYR → GYR Jun 19, 13:39 UTCJun 19, 15:04 UTC1h 25m
2026-06-19 VAR403 GYR → GYR Jun 19, 04:25 UTCJun 19, 06:54 UTC2h 30m
2026-06-18 VAR403 - Jun 18, 23:30 UTCJun 19, 01:15 UTC1h 44m
2026-06-18 VAR403 - Jun 18, 18:20 UTCJun 18, 19:30 UTC1h 10m
2026-06-18 VAR403 - Jun 18, 15:50 UTCJun 18, 16:45 UTC55m
2026-06-18 VAR403 GYR → GYR Jun 18, 13:45 UTCJun 18, 14:30 UTC45m
2026-06-18 VAR403 - Jun 18, 04:50 UTCJun 18, 05:35 UTC45m
2026-06-18 VAR403 - Jun 18, 00:30 UTCJun 18, 01:50 UTC1h 20m

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 N403AV page for operator, model, and routing details .

Mode-S A4B7DA frequently asked

What is Mode-S code A4B7DA?
A4B7DA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N403AV.
Where is Mode-S A4B7DA registered?
Mode-S code A4B7DA 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 A4B7DA broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B7DA, octal 51133732, decimal 10,794,970.
What flights does A4B7DA operate?
Mode-S A4B7DA has broadcast 1 distinct callsign, including VAR403.