Apparatus

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sensors Mode-S transponder

A3A979

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N335MD · PIPER PA-32 · operated by BAKER MARK A

Hex
A3A979
Octal
50724571
Decimal
10,725,753
Country
US
Tail
N335MD
Type
PA32
No current signal · last broadcast 8h ago
Flights observed
48
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A3A979.

Country allocation

The ICAO 24-bit address A3A979 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
N335MD - 48 2026-07-20

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-07-20 N335MD PAO → SJC Jul 20, 17:35 UTCJul 20, 17:50 UTC15m
2026-07-17 N335MD - Jul 17, 22:15 UTCJul 17, 23:30 UTC1h 15m
2026-07-17 N335MD - Jul 17, 19:30 UTCJul 17, 20:40 UTC1h 10m
2026-07-16 N335MD SJC → PAO Jul 16, 23:10 UTCJul 16, 23:20 UTC10m
2026-07-15 N335MD - Jul 15, 19:10 UTCJul 15, 19:35 UTC25m
2026-07-15 N335MD - Jul 15, 17:35 UTCJul 15, 17:50 UTC15m
2026-07-15 N335MD PAO → PAO Jul 15, 00:45 UTCJul 15, 00:50 UTC5m
2026-07-15 N335MD PAO → PAO Jul 15, 00:25 UTCJul 15, 00:40 UTC15m
2026-07-10 N335MD PAO → PAO Jul 10, 02:05 UTCJul 10, 02:10 UTC5m
2026-07-10 N335MD - Jul 10, 01:40 UTCJul 10, 01:50 UTC10m
2026-07-10 N335MD PAO → PAO Jul 10, 00:50 UTCJul 10, 01:30 UTC40m
2026-07-06 N335MD - Jul 6, 01:50 UTCJul 6, 02:45 UTC55m
2026-07-05 N335MD - Jul 5, 16:15 UTCJul 5, 17:10 UTC55m
2026-06-24 N335MD PAO → PAO Jun 24, 19:29 UTCJun 24, 21:04 UTC1h 35m
2026-06-23 N335MD - Jun 23, 17:44 UTCJun 23, 19:34 UTC1h 50m
2026-06-23 N335MD PAO → PAO Jun 23, 17:09 UTCJun 23, 17:15 UTC5m
2026-06-22 N335MD PAO → PAO Jun 22, 18:35 UTCJun 22, 19:49 UTC1h 15m
2026-06-20 N335MD - Jun 20, 23:14 UTCJun 20, 23:45 UTC30m
2026-06-19 N335MD - Jun 19, 23:44 UTCJun 20, 00:14 UTC30m
2026-06-13 N335MD - Jun 13, 20:35 UTCJun 13, 20:50 UTC15m
2026-06-13 N335MD - Jun 13, 19:30 UTCJun 13, 20:10 UTC40m
2026-06-13 N335MD - Jun 13, 17:45 UTCJun 13, 18:25 UTC40m
2026-06-08 N335MD NOT → PAO Jun 8, 01:20 UTCJun 8, 01:45 UTC25m
2026-06-07 N335MD FUL → NOT Jun 7, 22:15 UTCJun 8, 00:55 UTC2h 40m
2026-06-06 N335MD - Jun 6, 18:19 UTCJun 6, 19:34 UTC1h 15m
2026-06-06 N335MD - Jun 6, 16:20 UTCJun 6, 17:15 UTC55m
2026-06-06 N335MD PAO → NOT Jun 6, 14:50 UTCJun 6, 15:19 UTC30m
2026-06-05 N335MD PAO → PAO Jun 5, 21:00 UTCJun 5, 22:50 UTC1h 50m
2026-06-03 N335MD PAO → PAO Jun 3, 00:55 UTCJun 3, 02:30 UTC1h 35m
2026-05-30 N335MD - May 30, 18:35 UTCMay 30, 19:10 UTC35m
2026-05-30 N335MD - May 30, 18:20 UTCMay 30, 18:25 UTC5m
2026-05-30 N335MD - May 30, 17:10 UTCMay 30, 17:45 UTC35m
2026-05-28 N335MD - May 28, 02:25 UTCMay 28, 02:35 UTC10m
2026-05-28 N335MD PAO → SQL May 28, 01:50 UTCMay 28, 02:05 UTC15m
2026-05-28 N335MD PAO → PAO May 28, 01:15 UTCMay 28, 01:45 UTC30m
2026-05-25 N335MD - May 25, 22:25 UTCMay 25, 23:10 UTC45m
2026-05-25 N335MD - May 25, 18:55 UTCMay 25, 19:10 UTC15m
2026-05-22 N335MD - May 22, 23:35 UTCMay 23, 00:15 UTC40m
2026-04-28 N335MD PAO → PAO Apr 28, 16:55 UTCApr 28, 18:55 UTC2h 0m
2026-04-27 N335MD - Apr 27, 22:35 UTCApr 27, 23:45 UTC1h 10m
2026-04-27 N335MD - Apr 27, 18:40 UTCApr 27, 20:05 UTC1h 25m
2026-04-25 N335MD - Apr 25, 23:45 UTCApr 26, 00:10 UTC25m
2026-04-25 N335MD - Apr 25, 17:15 UTCApr 25, 17:45 UTC30m
2026-04-19 N335MD - Apr 19, 23:05 UTCApr 19, 23:25 UTC20m
2026-04-19 N335MD - Apr 19, 20:35 UTCApr 19, 21:00 UTC25m
2026-04-19 N335MD - Apr 19, 17:25 UTCApr 19, 17:50 UTC25m
2026-04-16 N335MD MCC → PAO Apr 16, 20:10 UTCApr 16, 21:05 UTC55m
2026-04-16 N335MD - Apr 16, 16:35 UTCApr 16, 17:10 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 N335MD page for operator, model, and routing details .

Mode-S A3A979 frequently asked

What is Mode-S code A3A979?
A3A979 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N335MD.
Where is Mode-S A3A979 registered?
Mode-S code A3A979 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 A3A979 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3A979, octal 50724571, decimal 10,725,753.
What flights does A3A979 operate?
Mode-S A3A979 has broadcast 1 distinct callsign, including N335MD.