Apparatus

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sensors Mode-S transponder

A4B1C7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N401QS · EMBRAER EMB-505 Phenom 300 · operated by NETJETS SALES INC

Hex
A4B1C7
Octal
51130707
Decimal
10,793,415
Country
US
Tail
N401QS
Type
E55P
No current signal · last broadcast 38m ago
Flights observed
159
Distinct callsigns
2
Country
US
Last broadcast
38m ago

Last known position

Most recent position reported by Mode-S A4B1C7.

Country allocation

The ICAO 24-bit address A4B1C7 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 2 distinct

Callsign Airline Flights Last seen
EJA401 NetJets 157 2026-06-11
N401QS - 2 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-11 EJA401 DAL → TUS Jun 11, 01:20 UTCJun 11, 01:45 UTC25m
2026-06-10 EJA401 DAL → TUS Jun 10, 23:15 UTCJun 10, 23:25 UTC10m
2026-06-10 EJA401 DAL → TUS Jun 10, 17:25 UTCJun 10, 22:00 UTC4h 35m
2026-06-10 EJA401 DAL → TUS Jun 10, 15:15 UTCJun 10, 16:15 UTC1h 0m
2026-06-09 EJA401 DAL → TUS Jun 9, 23:10 UTCJun 10, 01:00 UTC1h 50m
2026-06-09 EJA401 DAL → TUS Jun 9, 19:55 UTCJun 9, 20:45 UTC50m
2026-06-09 EJA401 DAL → TUS Jun 9, 19:00 UTCJun 9, 19:30 UTC30m
2026-06-08 EJA401 DAL → TUS Jun 8, 17:10 UTCJun 8, 19:25 UTC2h 15m
2026-06-08 EJA401 DAL → TUS Jun 8, 13:30 UTCJun 8, 15:50 UTC2h 20m
2026-06-08 EJA401 DAL → TUS Jun 8, 00:20 UTCJun 8, 01:45 UTC1h 25m
2026-06-07 EJA401 DAL → TUS Jun 7, 18:25 UTCJun 7, 19:55 UTC1h 30m
2026-06-07 EJA401 DAL → TUS Jun 7, 16:40 UTCJun 7, 17:00 UTC20m
2026-06-07 EJA401 DAL → TUS Jun 7, 15:20 UTCJun 7, 15:45 UTC25m
2026-06-06 EJA401 DAL → TUS Jun 6, 21:15 UTCJun 6, 23:44 UTC2h 30m
2026-06-06 EJA401 DAL → TUS Jun 6, 18:09 UTCJun 6, 19:10 UTC1h 0m
2026-06-05 EJA401 DAL → TUS Jun 5, 16:15 UTCJun 5, 17:05 UTC50m
2026-06-05 EJA401 DAL → TUS Jun 5, 14:05 UTCJun 5, 14:50 UTC45m
2026-06-04 EJA401 DAL → TUS Jun 4, 21:30 UTCJun 4, 22:10 UTC40m
2026-06-04 EJA401 DAL → TUS Jun 4, 19:15 UTCJun 4, 19:40 UTC25m
2026-06-04 EJA401 DAL → TUS Jun 4, 15:50 UTCJun 4, 17:20 UTC1h 30m
2026-06-04 EJA401 DAL → TUS Jun 4, 13:30 UTCJun 4, 14:20 UTC50m
2026-06-03 EJA401 DAL → TUS Jun 3, 21:00 UTCJun 3, 22:45 UTC1h 45m
2026-06-03 EJA401 DAL → TUS Jun 3, 15:20 UTCJun 3, 16:30 UTC1h 10m
2026-06-03 EJA401 DAL → TUS Jun 3, 14:15 UTCJun 3, 14:35 UTC20m
2026-06-03 EJA401 DAL → TUS Jun 3, 12:35 UTCJun 3, 13:15 UTC40m
2026-06-02 EJA401 DAL → TUS Jun 2, 21:50 UTCJun 2, 22:30 UTC40m
2026-06-02 EJA401 DAL → TUS Jun 2, 19:35 UTCJun 2, 20:50 UTC1h 15m
2026-06-02 EJA401 DAL → TUS Jun 2, 15:05 UTCJun 2, 15:20 UTC15m
2026-06-02 EJA401 DAL → TUS Jun 2, 12:35 UTCJun 2, 14:00 UTC1h 25m
2026-06-01 EJA401 DAL → TUS Jun 1, 22:25 UTCJun 1, 23:25 UTC1h 0m
2026-06-01 EJA401 DAL → TUS Jun 1, 17:15 UTCJun 1, 17:50 UTC35m
2026-06-01 EJA401 DAL → TUS Jun 1, 15:10 UTCJun 1, 16:25 UTC1h 15m
2026-06-01 EJA401 DAL → TUS Jun 1, 13:20 UTCJun 1, 13:50 UTC30m
2026-05-31 EJA401 DAL → TUS May 31, 21:50 UTCMay 31, 22:20 UTC30m
2026-05-31 EJA401 DAL → TUS May 31, 18:00 UTCMay 31, 20:45 UTC2h 45m
2026-05-31 EJA401 DAL → TUS May 31, 16:10 UTCMay 31, 16:20 UTC10m
2026-05-31 EJA401 DAL → TUS May 31, 13:05 UTCMay 31, 15:05 UTC2h 0m
2026-05-30 EJA401 DAL → TUS May 30, 17:10 UTCMay 30, 19:20 UTC2h 10m
2026-05-30 EJA401 DAL → TUS May 30, 13:25 UTCMay 30, 14:10 UTC45m
2026-05-29 EJA401 DAL → TUS May 29, 20:10 UTCMay 29, 21:45 UTC1h 35m
2026-05-29 EJA401 DAL → TUS May 29, 17:15 UTCMay 29, 18:25 UTC1h 10m
2026-05-29 EJA401 DAL → TUS May 29, 15:55 UTCMay 29, 16:25 UTC30m
2026-05-29 EJA401 DAL → TUS May 29, 14:10 UTCMay 29, 14:25 UTC15m
2026-05-28 EJA401 DAL → TUS May 28, 23:50 UTCMay 29, 00:35 UTC45m
2026-05-28 EJA401 DAL → TUS May 28, 22:35 UTCMay 28, 23:00 UTC25m
2026-05-28 EJA401 DAL → TUS May 28, 20:15 UTCMay 28, 20:50 UTC35m
2026-05-28 EJA401 DAL → TUS May 28, 16:05 UTCMay 28, 19:10 UTC3h 5m
2026-05-27 EJA401 DAL → TUS May 27, 21:45 UTCMay 28, 00:00 UTC2h 15m
2026-05-27 EJA401 DAL → TUS May 27, 20:05 UTCMay 27, 20:35 UTC30m
2026-05-27 EJA401 DAL → TUS May 27, 18:15 UTCMay 27, 18:55 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 N401QS page for operator, model, and routing details .

Mode-S A4B1C7 frequently asked

What is Mode-S code A4B1C7?
A4B1C7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N401QS.
Where is Mode-S A4B1C7 registered?
Mode-S code A4B1C7 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 A4B1C7 broadcasting right now?
No active broadcast right now. Last signal was 38m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B1C7, octal 51130707, decimal 10,793,415.
What flights does A4B1C7 operate?
Mode-S A4B1C7 has broadcast 2 distinct callsigns, including EJA401, N401QS.