Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A1A24E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N204QS · BOMBARDIER CL-600 Challenger · operated by NETJETS SALES INC

Hex
A1A24E
Octal
50321116
Decimal
10,592,846
Country
US
Tail
N204QS
Type
CL60
No current signal · last broadcast 1d ago
Flights observed
3
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A1A24E.

Country allocation

The ICAO 24-bit address A1A24E 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
EJA204 NetJets 3 2026-04-13

Recent flights last 3

DateFlightRouteTakeoffLandingDuration
2026-04-13 EJA204 CMH → TVC Apr 13, 19:50 UTCApr 13, 20:00 UTC10m
2026-04-13 EJA204 CMH → TVC Apr 13, 19:05 UTCApr 13, 20:00 UTC55m
2026-04-12 EJA204 CMH → TVC Apr 12, 19:35 UTCApr 12, 20:15 UTC40m

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 N204QS page for operator, model, and routing details .

Mode-S A1A24E frequently asked

What is Mode-S code A1A24E?
A1A24E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N204QS.
Where is Mode-S A1A24E registered?
Mode-S code A1A24E 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 A1A24E 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 A1A24E, octal 50321116, decimal 10,592,846.
What flights does A1A24E operate?
Mode-S A1A24E has broadcast 1 distinct callsign, including EJA204.