Apparatus

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sensors Mode-S transponder

A881AC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N6470Z · PIPER PA-25 Pawnee · operated by NORTHERN CALIFORNIA SOARING ASSOCIATION

Hex
A881AC
Octal
52100654
Decimal
11,043,244
Country
US
Tail
N6470Z
Type
PA25
No current signal · last broadcast Jul 18, 22:35 UTC
Flights observed
26
Distinct callsigns
1
Country
US
Last broadcast
Jul 18, 22:35 UTC

Last known position

Most recent position reported by Mode-S A881AC.

Country allocation

The ICAO 24-bit address A881AC 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
N6470Z - 26 2026-07-18

Recent flights last 26

DateFlightRouteTakeoffLandingDuration
2026-07-18 N6470Z - Jul 18, 21:05 UTCJul 18, 22:35 UTC1h 30m
2026-07-18 N6470Z - Jul 18, 20:45 UTCJul 18, 21:00 UTC15m
2026-07-18 N6470Z - Jul 18, 18:50 UTCJul 18, 20:05 UTC1h 15m
2026-07-18 N6470Z - Jul 18, 18:10 UTCJul 18, 18:25 UTC15m
2026-07-18 N6470Z - Jul 18, 17:35 UTCJul 18, 17:50 UTC15m
2026-07-18 N6470Z - Jul 18, 16:40 UTCJul 18, 17:30 UTC50m
2026-07-18 N6470Z - Jul 18, 15:40 UTCJul 18, 15:50 UTC10m
2026-07-12 N6470Z - Jul 12, 18:45 UTCJul 12, 19:50 UTC1h 5m
2026-07-12 N6470Z - Jul 12, 17:30 UTCJul 12, 18:10 UTC40m
2026-07-11 N6470Z - Jul 11, 20:15 UTCJul 11, 20:45 UTC30m
2026-07-11 N6470Z - Jul 11, 18:55 UTCJul 11, 19:20 UTC25m
2026-07-11 N6470Z - Jul 11, 18:30 UTCJul 11, 18:45 UTC15m
2026-07-05 N6470Z - Jul 5, 20:30 UTCJul 5, 21:05 UTC35m
2026-07-05 N6470Z - Jul 5, 18:20 UTCJul 5, 18:30 UTC10m
2026-06-28 N6470Z - Jun 28, 21:59 UTCJun 28, 22:15 UTC15m
2026-06-28 N6470Z - Jun 28, 20:39 UTCJun 28, 20:59 UTC20m
2026-06-28 N6470Z - Jun 28, 19:04 UTCJun 28, 19:20 UTC15m
2026-06-28 N6470Z - Jun 28, 18:00 UTCJun 28, 18:44 UTC45m
2026-06-28 N6470Z - Jun 28, 16:49 UTCJun 28, 17:55 UTC1h 5m
2026-06-28 N6470Z - Jun 28, 16:19 UTCJun 28, 16:29 UTC10m
2026-06-20 N6470Z - Jun 20, 20:55 UTCJun 20, 21:10 UTC15m
2026-06-20 N6470Z - Jun 20, 19:44 UTCJun 20, 20:29 UTC45m
2026-06-20 N6470Z - Jun 20, 18:59 UTCJun 20, 19:09 UTC10m
2026-06-20 N6470Z - Jun 20, 17:39 UTCJun 20, 18:19 UTC40m
2026-06-20 N6470Z - Jun 20, 16:44 UTCJun 20, 16:59 UTC15m
2026-06-20 N6470Z - Jun 20, 16:05 UTCJun 20, 16:09 UTC5m

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 N6470Z page for operator, model, and routing details .

Mode-S A881AC frequently asked

What is Mode-S code A881AC?
A881AC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N6470Z.
Where is Mode-S A881AC registered?
Mode-S code A881AC 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 A881AC broadcasting right now?
No active broadcast right now. Last signal was Jul 18, 22:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A881AC, octal 52100654, decimal 11,043,244.
What flights does A881AC operate?
Mode-S A881AC has broadcast 1 distinct callsign, including N6470Z.