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sensors Mode-S transponder

A3D1AB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N345UH · ROBINSON R-22 Mariner · operated by UHI INC

Hex
A3D1AB
Octal
50750653
Decimal
10,736,043
Country
US
Tail
N345UH
Type
R22
No current signal · last broadcast Jul 24, 17:30 UTC
Flights observed
60
Distinct callsigns
1
Country
US
Last broadcast
Jul 24, 17:30 UTC

Last known position

Most recent position reported by Mode-S A3D1AB.

Country allocation

The ICAO 24-bit address A3D1AB 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
N345UH - 60 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N345UH - Jul 24, 16:30 UTCJul 24, 17:30 UTC1h 0m
2026-07-23 N345UH - Jul 23, 05:15 UTCJul 23, 05:50 UTC35m
2026-07-23 N345UH - Jul 23, 03:40 UTCJul 23, 04:25 UTC45m
2026-07-20 N345UH - Jul 20, 14:35 UTCJul 20, 15:50 UTC1h 15m
2026-07-16 N345UH - Jul 16, 15:14 UTCJul 16, 15:40 UTC25m
2026-07-16 N345UH - Jul 16, 14:45 UTCJul 16, 15:10 UTC25m
2026-07-15 N345UH - Jul 15, 18:50 UTCJul 15, 19:30 UTC40m
2026-07-15 N345UH - Jul 15, 15:35 UTCJul 15, 16:00 UTC25m
2026-07-15 N345UH - Jul 15, 15:10 UTCJul 15, 15:25 UTC15m
2026-07-14 N345UH - Jul 14, 15:10 UTCJul 14, 15:45 UTC35m
2026-07-14 N345UH - Jul 14, 14:45 UTCJul 14, 15:05 UTC20m
2026-07-13 N345UH - Jul 13, 18:30 UTCJul 13, 19:15 UTC45m
2026-07-13 N345UH - Jul 13, 14:50 UTCJul 13, 15:45 UTC55m
2026-07-08 N345UH - Jul 8, 18:40 UTCJul 8, 19:20 UTC40m
2026-07-08 N345UH - Jul 8, 16:45 UTCJul 8, 17:25 UTC40m
2026-07-08 N345UH - Jul 8, 14:45 UTCJul 8, 15:30 UTC45m
2026-07-07 N345UH - Jul 7, 22:00 UTCJul 7, 22:10 UTC10m
2026-07-07 N345UH - Jul 7, 16:45 UTCJul 7, 17:30 UTC45m
2026-07-07 N345UH - Jul 7, 15:00 UTCJul 7, 15:45 UTC45m
2026-07-06 N345UH - Jul 6, 18:40 UTCJul 6, 19:20 UTC40m
2026-07-06 N345UH - Jul 6, 14:50 UTCJul 6, 15:40 UTC50m
2026-07-02 N345UH - Jul 2, 17:10 UTCJul 2, 17:55 UTC45m
2026-07-02 N345UH - Jul 2, 14:50 UTCJul 2, 15:55 UTC1h 5m
2026-07-01 N345UH - Jul 1, 16:05 UTCJul 1, 17:15 UTC1h 10m
2026-06-30 N345UH - Jun 30, 19:05 UTCJun 30, 19:45 UTC40m
2026-06-30 N345UH - Jun 30, 14:55 UTCJun 30, 15:50 UTC55m
2026-06-29 N345UH - Jun 29, 19:20 UTCJun 29, 19:29 UTC10m
2026-06-29 N345UH - Jun 29, 18:49 UTCJun 29, 19:05 UTC15m
2026-06-29 N345UH - Jun 29, 14:44 UTCJun 29, 15:34 UTC50m
2026-06-26 N345UH - Jun 26, 16:30 UTCJun 26, 17:19 UTC50m
2026-06-26 N345UH - Jun 26, 14:55 UTCJun 26, 15:34 UTC40m
2026-06-25 N345UH - Jun 25, 16:45 UTCJun 25, 17:39 UTC55m
2026-06-25 N345UH - Jun 25, 14:55 UTCJun 25, 15:34 UTC40m
2026-06-25 N345UH - Jun 25, 11:35 UTCJun 25, 12:15 UTC40m
2026-06-24 N345UH - Jun 24, 18:25 UTCJun 24, 19:00 UTC35m
2026-06-24 N345UH - Jun 24, 14:50 UTCJun 24, 15:29 UTC40m
2026-06-23 N345UH - Jun 23, 17:39 UTCJun 23, 18:25 UTC45m
2026-06-23 N345UH - Jun 23, 14:59 UTCJun 23, 15:34 UTC35m
2026-06-22 N345UH - Jun 22, 18:44 UTCJun 22, 19:29 UTC45m
2026-06-22 N345UH - Jun 22, 14:55 UTCJun 22, 15:35 UTC40m
2026-06-19 N345UH - Jun 19, 16:44 UTCJun 19, 17:19 UTC35m
2026-06-18 N345UH - Jun 18, 19:20 UTCJun 18, 19:30 UTC10m
2026-06-18 N345UH - Jun 18, 18:45 UTCJun 18, 19:10 UTC25m
2026-06-18 N345UH - Jun 18, 16:45 UTCJun 18, 17:21 UTC36m
2026-06-18 N345UH - Jun 18, 14:40 UTCJun 18, 15:25 UTC45m
2026-06-17 N345UH - Jun 17, 18:30 UTCJun 17, 19:10 UTC40m
2026-06-17 N345UH - Jun 17, 15:05 UTCJun 17, 15:40 UTC35m
2026-06-10 N345UH - Jun 10, 14:55 UTCJun 10, 15:50 UTC55m
2026-06-09 N345UH - Jun 9, 19:20 UTCJun 9, 19:50 UTC30m
2026-06-09 N345UH - Jun 9, 17:05 UTCJun 9, 17:50 UTC45m

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 N345UH page for operator, model, and routing details .

Mode-S A3D1AB frequently asked

What is Mode-S code A3D1AB?
A3D1AB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N345UH.
Where is Mode-S A3D1AB registered?
Mode-S code A3D1AB 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 A3D1AB broadcasting right now?
No active broadcast right now. Last signal was Jul 24, 17:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3D1AB, octal 50750653, decimal 10,736,043.
What flights does A3D1AB operate?
Mode-S A3D1AB has broadcast 1 distinct callsign, including N345UH.