Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4405F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N373QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, BANK OF UTAH TRUSTEE, BIM AIRCRAFT LLC, DAVITA INC

Hex
A4405F
Octal
51040137
Decimal
10,764,383
Country
US
Tail
N373QS
Type
E55P
Photo of N373QS
No current signal · last broadcast 1d ago
Flights observed
4
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A4405F.

Country allocation

The ICAO 24-bit address A4405F 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
EJA373 NetJets 4 2026-04-13

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-04-13 EJA373 MPV → TEB Apr 13, 20:25 UTCApr 13, 22:15 UTC1h 50m
2026-04-13 EJA373 MPV → TEB Apr 13, 16:15 UTCApr 13, 16:55 UTC40m
2026-04-13 EJA373 MPV → TEB Apr 13, 15:55 UTCApr 13, 16:15 UTC20m
2026-04-13 EJA373 MPV → TEB Apr 13, 14:10 UTCApr 13, 15:05 UTC55m

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 N373QS page for operator, model, and routing details .

Mode-S A4405F frequently asked

What is Mode-S code A4405F?
A4405F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N373QS.
Where is Mode-S A4405F registered?
Mode-S code A4405F 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 A4405F 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 A4405F, octal 51040137, decimal 10,764,383.
What flights does A4405F operate?
Mode-S A4405F has broadcast 1 distinct callsign, including EJA373.