Apparatus

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sensors Mode-S transponder

A11BBA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1701T · PIPER PA-28-140/150/160/180 · operated by RD AIRE LLC

Hex
A11BBA
Octal
50215672
Decimal
10,558,394
Country
US
Tail
N1701T
Type
P28A
No current signal · last broadcast 23h ago
Flights observed
10
Distinct callsigns
1
Country
US
Last broadcast
23h ago

Last known position

Most recent position reported by Mode-S A11BBA.

Country allocation

The ICAO 24-bit address A11BBA 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
N1701T - 10 2026-04-13

Recent flights last 10

DateFlightRouteTakeoffLandingDuration
2026-04-13 N1701T - Apr 13, 21:25 UTCApr 13, 23:45 UTC2h 20m
2026-04-13 N1701T - Apr 13, 19:45 UTCApr 13, 20:05 UTC20m
2026-04-13 N1701T - Apr 13, 18:35 UTCApr 13, 18:45 UTC10m
2026-04-13 N1701T - Apr 13, 17:40 UTCApr 13, 17:50 UTC10m
2026-04-13 N1701T - Apr 13, 16:35 UTCApr 13, 16:50 UTC15m
2026-04-13 N1701T - Apr 13, 15:25 UTCApr 13, 15:50 UTC25m
2026-04-13 N1701T - Apr 13, 13:45 UTCApr 13, 14:00 UTC15m
2026-04-13 N1701T - Apr 13, 12:20 UTCApr 13, 13:00 UTC40m
2026-04-13 N1701T - Apr 13, 11:50 UTCApr 13, 12:15 UTC25m
2026-04-12 N1701T AUO → AUO Apr 12, 17:40 UTCApr 12, 18:10 UTC30m

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 N1701T page for operator, model, and routing details .

Mode-S A11BBA frequently asked

What is Mode-S code A11BBA?
A11BBA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1701T.
Where is Mode-S A11BBA registered?
Mode-S code A11BBA 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 A11BBA broadcasting right now?
No active broadcast right now. Last signal was 23h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A11BBA, octal 50215672, decimal 10,558,394.
What flights does A11BBA operate?
Mode-S A11BBA has broadcast 1 distinct callsign, including N1701T.