Apparatus

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sensors Mode-S transponder

A3DC23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N348MK · PIPER PA-28-140/150/160/180 · operated by NORTH STAR AVIATION

Hex
A3DC23
Octal
50756043
Decimal
10,738,723
Country
US
Tail
N348MK
Type
P28A
No current signal · last broadcast 55m ago
Flights observed
23
Distinct callsigns
1
Country
US
Last broadcast
55m ago

Last known position

Most recent position reported by Mode-S A3DC23.

Country allocation

The ICAO 24-bit address A3DC23 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
MVK47 - 23 2026-04-18

Recent flights last 23

DateFlightRouteTakeoffLandingDuration
2026-04-18 MVK47 - Apr 18, 19:35 UTCApr 18, 20:10 UTC35m
2026-04-18 MVK47 - Apr 18, 12:25 UTCApr 18, 12:35 UTC10m
2026-04-18 MVK47 - Apr 18, 01:35 UTCApr 18, 02:10 UTC35m
2026-04-17 MVK47 - Apr 17, 19:25 UTCApr 17, 20:10 UTC45m
2026-04-17 MVK47 - Apr 17, 03:20 UTCApr 17, 03:35 UTC15m
2026-04-16 MVK47 - Apr 16, 21:55 UTCApr 16, 22:34 UTC40m
2026-04-16 MVK47 - Apr 16, 18:45 UTCApr 16, 19:10 UTC25m
2026-04-16 MVK47 - Apr 16, 14:25 UTCApr 16, 15:05 UTC40m
2026-04-16 MVK47 - Apr 16, 12:39 UTCApr 16, 13:05 UTC25m
2026-04-16 MVK47 - Apr 16, 03:09 UTCApr 16, 04:29 UTC1h 20m
2026-04-16 MVK47 - Apr 16, 02:40 UTCApr 16, 03:04 UTC25m
2026-04-15 MVK47 - Apr 15, 23:10 UTCApr 15, 23:50 UTC40m
2026-04-15 MVK47 - Apr 15, 22:50 UTCApr 15, 23:00 UTC10m
2026-04-15 MVK47 - Apr 15, 19:05 UTCApr 15, 19:15 UTC10m
2026-04-15 MVK47 - Apr 15, 18:45 UTCApr 15, 18:55 UTC10m
2026-04-15 MVK47 - Apr 15, 17:30 UTCApr 15, 17:45 UTC15m
2026-04-15 MVK47 - Apr 15, 14:30 UTCApr 15, 14:40 UTC10m
2026-04-15 MVK47 - Apr 15, 13:01 UTCApr 15, 13:15 UTC15m
2026-04-15 MVK47 - Apr 15, 12:01 UTCApr 15, 12:55 UTC55m
2026-04-15 MVK47 - Apr 15, 03:50 UTCApr 15, 04:35 UTC45m
2026-04-15 MVK47 - Apr 15, 02:55 UTCApr 15, 03:10 UTC15m
2026-04-15 MVK47 - Apr 15, 02:20 UTCApr 15, 02:50 UTC30m
2026-04-14 MVK47 - Apr 14, 20:40 UTCApr 14, 20:50 UTC10m

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 N348MK page for operator, model, and routing details .

Mode-S A3DC23 frequently asked

What is Mode-S code A3DC23?
A3DC23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N348MK.
Where is Mode-S A3DC23 registered?
Mode-S code A3DC23 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 A3DC23 broadcasting right now?
No active broadcast right now. Last signal was 55m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3DC23, octal 50756043, decimal 10,738,723.
What flights does A3DC23 operate?
Mode-S A3DC23 has broadcast 1 distinct callsign, including MVK47.