Apparatus

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sensors Mode-S transponder

A1A004

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20332 · CESSNA 172 Skyhawk · operated by N20332 LLC

Hex
A1A004
Octal
50320004
Decimal
10,592,260
Country
US
Tail
N20332
Type
C172
No current signal · last broadcast 5d ago
Flights observed
233
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A1A004.

Country allocation

The ICAO 24-bit address A1A004 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
N20332 - 233 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-09 N20332 - Jul 9, 00:55 UTCJul 9, 02:35 UTC1h 40m
2026-07-08 N20332 OPF → OPF Jul 8, 15:35 UTCJul 8, 16:30 UTC55m
2026-07-08 N20332 OPF → OPF Jul 8, 12:45 UTCJul 8, 13:10 UTC25m
2026-07-07 N20332 - Jul 7, 23:05 UTCJul 8, 00:10 UTC1h 5m
2026-07-07 N20332 - Jul 7, 12:45 UTCJul 7, 13:35 UTC50m
2026-07-07 N20332 - Jul 7, 11:05 UTCJul 7, 11:35 UTC30m
2026-07-06 N20332 OPF → OPF Jul 6, 12:40 UTCJul 6, 13:45 UTC1h 5m
2026-07-05 N20332 - Jul 5, 12:40 UTCJul 5, 14:10 UTC1h 30m
2026-07-04 N20332 - Jul 4, 11:40 UTCJul 4, 12:55 UTC1h 15m
2026-07-03 N20332 - Jul 3, 20:50 UTCJul 3, 21:00 UTC10m
2026-07-03 N20332 - Jul 3, 17:40 UTCJul 3, 19:00 UTC1h 20m
2026-07-03 N20332 - Jul 3, 10:45 UTCJul 3, 12:25 UTC1h 40m
2026-07-02 N20332 - Jul 2, 15:50 UTCJul 2, 16:55 UTC1h 5m
2026-07-02 N20332 - Jul 2, 10:50 UTCJul 2, 12:20 UTC1h 30m
2026-07-01 N20332 OPF → OPF Jul 1, 15:45 UTCJul 1, 16:50 UTC1h 5m
2026-07-01 N20332 - Jul 1, 12:40 UTCJul 1, 13:45 UTC1h 5m
2026-06-30 N20332 - Jun 30, 15:40 UTCJun 30, 17:00 UTC1h 20m
2026-06-30 N20332 OPF → OPF Jun 30, 12:40 UTCJun 30, 13:40 UTC1h 0m
2026-06-30 N20332 OPF → OPF Jun 30, 11:05 UTCJun 30, 12:00 UTC55m
2026-06-29 N20332 - Jun 29, 16:00 UTCJun 29, 16:59 UTC1h 0m
2026-06-29 N20332 - Jun 29, 12:39 UTCJun 29, 13:49 UTC1h 10m
2026-06-28 N20332 - Jun 28, 15:14 UTCJun 28, 16:29 UTC1h 15m
2026-06-28 N20332 - Jun 28, 12:39 UTCJun 28, 13:29 UTC50m
2026-06-28 N20332 - Jun 28, 11:19 UTCJun 28, 11:39 UTC20m
2026-06-27 N20332 - Jun 27, 11:35 UTCJun 27, 13:15 UTC1h 40m
2026-06-26 N20332 OPF → OPF Jun 26, 16:00 UTCJun 26, 16:54 UTC55m
2026-06-26 N20332 - Jun 26, 12:50 UTCJun 26, 13:30 UTC40m
2026-06-25 N20332 - Jun 25, 23:34 UTCJun 26, 00:24 UTC50m
2026-06-25 N20332 - Jun 25, 15:29 UTCJun 25, 16:14 UTC45m
2026-06-25 N20332 OPF → OPF Jun 25, 12:19 UTCJun 25, 13:29 UTC1h 10m
2026-06-24 N20332 - Jun 24, 16:09 UTCJun 24, 16:50 UTC40m
2026-06-24 N20332 - Jun 24, 12:50 UTCJun 24, 13:44 UTC55m
2026-06-24 N20332 - Jun 24, 10:59 UTCJun 24, 11:50 UTC50m
2026-06-23 N20332 - Jun 23, 12:15 UTCJun 23, 13:05 UTC50m
2026-06-23 N20332 - Jun 23, 10:55 UTCJun 23, 11:29 UTC35m
2026-06-22 N20332 - Jun 22, 15:40 UTCJun 22, 16:54 UTC1h 15m
2026-06-21 N20332 OPF → OPF Jun 21, 11:30 UTCJun 21, 12:35 UTC1h 5m
2026-06-20 N20332 - Jun 20, 16:59 UTCJun 20, 17:24 UTC25m
2026-06-20 N20332 - Jun 20, 15:14 UTCJun 20, 15:44 UTC30m
2026-06-20 N20332 - Jun 20, 12:39 UTCJun 20, 13:39 UTC1h 0m
2026-06-20 N20332 - Jun 20, 10:39 UTCJun 20, 11:44 UTC1h 5m
2026-06-20 N20332 - Jun 20, 00:09 UTCJun 20, 01:24 UTC1h 15m
2026-06-19 N20332 - Jun 19, 15:39 UTCJun 19, 16:34 UTC55m
2026-06-19 N20332 - Jun 19, 12:49 UTCJun 19, 14:09 UTC1h 20m
2026-06-18 N20332 - Jun 18, 22:45 UTCJun 18, 23:30 UTC45m
2026-06-18 N20332 - Jun 18, 19:50 UTCJun 18, 21:35 UTC1h 45m
2026-06-18 N20332 OPF → OPF Jun 18, 12:40 UTCJun 18, 13:55 UTC1h 15m
2026-06-18 N20332 OPF → OPF Jun 18, 11:05 UTCJun 18, 11:55 UTC50m
2026-06-18 N20332 - Jun 18, 00:55 UTCJun 18, 02:55 UTC2h 0m
2026-06-17 N20332 OPF → OPF Jun 17, 20:40 UTCJun 17, 21:55 UTC1h 15m

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 N20332 page for operator, model, and routing details .

Mode-S A1A004 frequently asked

What is Mode-S code A1A004?
A1A004 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20332.
Where is Mode-S A1A004 registered?
Mode-S code A1A004 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 A1A004 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A004, octal 50320004, decimal 10,592,260.
What flights does A1A004 operate?
Mode-S A1A004 has broadcast 1 distinct callsign, including N20332.