Apparatus

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sensors Mode-S transponder

A55731

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N443QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC, WESBURY BRIAN S, ITC-SW CAPITAL LLC, RAMSEY JOHN, NAVIENT SOLUTIONS LLC, NORMAN OUTDOOR LLC

Hex
A55731
Octal
51253461
Decimal
10,835,761
Country
US
Tail
N443QS
Type
E55P
No current signal · last broadcast 5h ago
Flights observed
143
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A55731.

Country allocation

The ICAO 24-bit address A55731 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
EJA443 NetJets 143 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 EJA443 SUN → SBA May 29, 21:30 UTCMay 30, 00:05 UTC2h 35m
2026-05-29 EJA443 SUN → SBA May 29, 19:10 UTCMay 29, 20:30 UTC1h 20m
2026-05-29 EJA443 SUN → SBA May 29, 16:35 UTCMay 29, 17:45 UTC1h 10m
2026-05-28 EJA443 SUN → SBA May 28, 23:00 UTCMay 29, 15:30 UTC16h 30m
2026-05-28 EJA443 SUN → SBA May 28, 17:30 UTCMay 28, 19:35 UTC2h 5m
2026-05-28 EJA443 SUN → SBA May 28, 14:15 UTCMay 28, 16:25 UTC2h 10m
2026-05-27 EJA443 SUN → SBA May 27, 22:40 UTCMay 27, 23:10 UTC30m
2026-05-27 EJA443 SUN → SBA May 27, 21:45 UTCMay 27, 22:05 UTC20m
2026-05-27 EJA443 SUN → SBA May 27, 17:30 UTCMay 27, 18:40 UTC1h 10m
2026-05-27 EJA443 SUN → SBA May 27, 14:50 UTCMay 27, 16:15 UTC1h 25m
2026-05-26 EJA443 SUN → SBA May 26, 19:45 UTCMay 26, 20:34 UTC50m
2026-05-26 EJA443 SUN → SBA May 26, 17:55 UTCMay 26, 18:59 UTC1h 5m
2026-05-26 EJA443 SUN → SBA May 26, 14:00 UTCMay 26, 14:14 UTC15m
2026-05-26 EJA443 SUN → SBA May 26, 11:34 UTCMay 26, 12:20 UTC45m
2026-05-25 EJA443 SUN → SBA May 25, 20:09 UTCMay 25, 21:04 UTC55m
2026-05-25 EJA443 SUN → SBA May 25, 17:20 UTCMay 25, 17:50 UTC30m
2026-05-25 EJA443 SUN → SBA May 25, 15:45 UTCMay 25, 16:25 UTC40m
2026-05-24 EJA443 SUN → SBA May 24, 20:10 UTCMay 24, 20:45 UTC35m
2026-05-24 EJA443 SUN → SBA May 24, 18:55 UTCMay 24, 19:25 UTC30m
2026-05-24 EJA443 SUN → SBA May 24, 16:40 UTCMay 24, 17:15 UTC35m
2026-05-24 EJA443 SUN → SBA May 24, 14:05 UTCMay 24, 14:45 UTC40m
2026-05-23 EJA443 SUN → SBA May 23, 20:05 UTCMay 23, 20:45 UTC40m
2026-05-23 EJA443 SUN → SBA May 23, 13:25 UTCMay 23, 15:55 UTC2h 30m
2026-05-23 EJA443 SUN → SBA May 23, 11:45 UTCMay 23, 12:00 UTC15m
2026-05-22 EJA443 SUN → SBA May 22, 19:30 UTCMay 22, 23:05 UTC3h 35m
2026-05-22 EJA443 SUN → SBA May 22, 17:20 UTCMay 22, 18:00 UTC40m
2026-05-22 EJA443 SUN → SBA May 22, 15:10 UTCMay 22, 16:30 UTC1h 20m
2026-05-22 EJA443 SUN → SBA May 22, 11:55 UTCMay 22, 13:20 UTC1h 25m
2026-05-21 EJA443 SUN → SBA May 21, 23:15 UTCMay 22, 00:20 UTC1h 5m
2026-05-21 EJA443 SUN → SBA May 21, 20:40 UTCMay 21, 22:30 UTC1h 50m
2026-05-21 EJA443 SUN → SBA May 21, 18:30 UTCMay 21, 19:15 UTC45m
2026-05-21 EJA443 SUN → SBA May 21, 14:25 UTCMay 21, 16:55 UTC2h 30m
2026-05-21 EJA443 SUN → SBA May 21, 13:10 UTCMay 21, 13:20 UTC10m
2026-05-20 EJA443 SUN → SBA May 20, 19:25 UTCMay 20, 21:15 UTC1h 50m
2026-05-20 EJA443 SUN → SBA May 20, 16:50 UTCMay 20, 17:25 UTC35m
2026-05-20 EJA443 SUN → SBA May 20, 15:05 UTCMay 20, 15:55 UTC50m
2026-05-20 EJA443 SUN → SBA May 20, 11:50 UTCMay 20, 14:15 UTC2h 25m
2026-05-18 EJA443 SUN → SBA May 18, 15:25 UTCMay 18, 16:30 UTC1h 5m
2026-05-16 EJA443 SUN → SBA May 16, 12:40 UTCMay 16, 13:55 UTC1h 15m
2026-05-15 EJA443 SUN → SBA May 15, 17:05 UTCMay 15, 17:40 UTC35m
2026-05-15 EJA443 SUN → SBA May 15, 15:10 UTCMay 15, 15:35 UTC25m
2026-05-14 EJA443 SUN → SBA May 14, 22:30 UTCMay 15, 00:20 UTC1h 50m
2026-05-14 EJA443 SUN → SBA May 14, 19:10 UTCMay 14, 21:50 UTC2h 40m
2026-05-13 EJA443 SUN → SBA May 13, 22:50 UTCMay 13, 23:55 UTC1h 5m
2026-05-13 EJA443 SUN → SBA May 13, 20:30 UTCMay 13, 21:30 UTC1h 0m
2026-05-13 EJA443 SUN → SBA May 13, 16:20 UTCMay 13, 18:30 UTC2h 10m
2026-05-11 EJA443 SUN → SBA May 11, 22:05 UTCMay 11, 22:35 UTC29m
2026-05-11 EJA443 SUN → SBA May 11, 19:30 UTCMay 11, 20:00 UTC30m
2026-05-11 EJA443 SUN → SBA May 11, 17:30 UTCMay 11, 18:20 UTC50m
2026-05-11 EJA443 SUN → SBA May 11, 14:55 UTCMay 11, 16:35 UTC1h 40m

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 N443QS page for operator, model, and routing details .

Mode-S A55731 frequently asked

What is Mode-S code A55731?
A55731 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N443QS.
Where is Mode-S A55731 registered?
Mode-S code A55731 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 A55731 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A55731, octal 51253461, decimal 10,835,761.
What flights does A55731 operate?
Mode-S A55731 has broadcast 1 distinct callsign, including EJA443.