Apparatus

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sensors Mode-S transponder

A19B2F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N202TW · PILATUS PC-12 · operated by TW LEASING LLC

Hex
A19B2F
Octal
50315457
Decimal
10,591,023
Country
US
Tail
N202TW
Type
PC12
No current signal · last broadcast 1d ago
Flights observed
8
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A19B2F.

Country allocation

The ICAO 24-bit address A19B2F 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
GPD202 Tradewind Aviation 8 2026-04-13

Recent flights last 8

DateFlightRouteTakeoffLandingDuration
2026-04-13 GPD202 HVN → OXC Apr 13, 22:00 UTCApr 13, 23:00 UTC1h 0m
2026-04-13 GPD202 HVN → OXC Apr 13, 19:50 UTCApr 13, 20:20 UTC30m
2026-04-13 GPD202 HVN → OXC Apr 13, 18:45 UTCApr 13, 20:10 UTC1h 25m
2026-04-13 GPD202 HVN → OXC Apr 13, 17:30 UTCApr 13, 18:15 UTC45m
2026-04-13 GPD202 HVN → OXC Apr 13, 16:15 UTCApr 13, 16:30 UTC15m
2026-04-13 GPD202 HVN → OXC Apr 13, 15:50 UTCApr 13, 16:30 UTC40m
2026-04-13 GPD202 HVN → OXC Apr 13, 15:20 UTCApr 13, 16:15 UTC55m
2026-04-12 GPD202 HVN → OXC Apr 12, 23:55 UTCApr 13, 00:25 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 N202TW page for operator, model, and routing details .

Mode-S A19B2F frequently asked

What is Mode-S code A19B2F?
A19B2F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N202TW.
Where is Mode-S A19B2F registered?
Mode-S code A19B2F 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 A19B2F broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A19B2F, octal 50315457, decimal 10,591,023.
What flights does A19B2F operate?
Mode-S A19B2F has broadcast 1 distinct callsign, including GPD202.