Apparatus

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sensors Mode-S transponder

A959B4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N701QS · BOMBARDIER BD-100 Challenger 350 · operated by NETJETS SALES INC, DELAMARTER BRIAN RICK, COX AVIATION LLC, HFC ACCEPTANCE LLC, GIPSON JAMES, MAIR AIR 2 LLC

Hex
A959B4
Octal
52254664
Decimal
11,098,548
Country
US
Tail
N701QS
Type
CL35
No current signal · last broadcast 7d ago
Flights observed
65
Distinct callsigns
2
Country
US
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S A959B4.

Country allocation

The ICAO 24-bit address A959B4 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
EJA701 NetJets 61 2026-05-22
N701QS - 4 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-22 EJA701 APA → YUL May 22, 14:15 UTCMay 22, 14:30 UTC15m
2026-05-21 EJA701 APA → YUL May 21, 22:10 UTCMay 22, 00:05 UTC1h 55m
2026-05-21 EJA701 APA → YUL May 21, 19:40 UTCMay 21, 20:55 UTC1h 15m
2026-05-21 EJA701 APA → YUL May 21, 18:25 UTCMay 21, 18:55 UTC30m
2026-05-21 EJA701 APA → YUL May 21, 16:15 UTCMay 21, 17:20 UTC1h 5m
2026-05-21 EJA701 APA → YUL May 21, 01:10 UTCMay 21, 03:10 UTC2h 0m
2026-05-20 EJA701 APA → YUL May 20, 21:55 UTCMay 21, 00:10 UTC2h 15m
2026-05-20 EJA701 APA → YUL May 20, 19:00 UTCMay 20, 19:15 UTC15m
2026-05-20 EJA701 APA → YUL May 20, 13:55 UTCMay 20, 15:50 UTC1h 55m
2026-05-20 EJA701 APA → YUL May 20, 12:10 UTCMay 20, 13:10 UTC1h 0m
2026-05-13 EJA701 APA → YUL May 13, 02:15 UTCMay 13, 04:20 UTC2h 5m
2026-05-12 EJA701 APA → YUL May 12, 22:40 UTCMay 13, 01:30 UTC2h 50m
2026-05-11 EJA701 APA → YUL May 11, 17:00 UTCMay 11, 19:20 UTC2h 20m
2026-05-11 EJA701 APA → YUL May 11, 11:25 UTCMay 11, 14:40 UTC3h 15m
2026-05-11 EJA701 APA → YUL May 11, 00:30 UTCMay 11, 02:40 UTC2h 10m
2026-05-10 EJA701 APA → YUL May 10, 20:20 UTCMay 10, 22:49 UTC2h 30m
2026-05-09 EJA701 APA → YUL May 9, 09:45 UTCMay 9, 10:40 UTC55m
2026-05-09 EJA701 APA → YUL May 9, 07:50 UTCMay 9, 08:55 UTC1h 5m
2026-05-09 EJA701 APA → YUL May 9, 00:35 UTCMay 9, 01:15 UTC40m
2026-05-08 EJA701 APA → YUL May 8, 18:45 UTCMay 8, 23:15 UTC4h 30m
2026-05-08 EJA701 APA → YUL May 8, 15:05 UTCMay 8, 16:00 UTC55m
2026-05-07 EJA701 APA → YUL May 7, 20:45 UTCMay 8, 00:40 UTC3h 55m
2026-05-07 EJA701 APA → YUL May 7, 17:30 UTCMay 7, 18:55 UTC1h 25m
2026-05-07 EJA701 APA → YUL May 7, 14:45 UTCMay 7, 16:10 UTC1h 25m
2026-05-06 EJA701 APA → YUL May 6, 20:55 UTCMay 7, 02:10 UTC5h 15m
2026-05-04 EJA701 APA → YUL May 4, 14:30 UTCMay 4, 16:50 UTC2h 20m
2026-05-03 EJA701 APA → YUL May 3, 20:55 UTCMay 3, 21:14 UTC20m
2026-05-03 N701QS - May 3, 19:30 UTCMay 3, 20:05 UTC35m
2026-05-03 N701QS - May 3, 17:29 UTCMay 3, 17:50 UTC20m
2026-05-03 N701QS - May 3, 14:55 UTCMay 3, 15:10 UTC15m
2026-05-03 N701QS - May 3, 13:10 UTCMay 3, 13:35 UTC25m
2026-05-02 EJA701 APA → YUL May 2, 14:50 UTCMay 2, 17:35 UTC2h 45m
2026-05-02 EJA701 APA → YUL May 2, 13:20 UTCMay 2, 13:35 UTC15m
2026-05-01 EJA701 APA → YUL May 1, 17:10 UTCMay 1, 19:40 UTC2h 30m
2026-05-01 EJA701 APA → YUL May 1, 14:00 UTCMay 1, 16:00 UTC2h 0m
2026-05-01 EJA701 APA → YUL May 1, 11:20 UTCMay 1, 12:35 UTC1h 15m
2026-04-27 EJA701 APA → YUL Apr 27, 23:05 UTCApr 28, 02:50 UTC3h 45m
2026-04-26 EJA701 APA → YUL Apr 26, 19:50 UTCApr 27, 01:40 UTC5h 50m
2026-04-26 EJA701 APA → YUL Apr 26, 14:20 UTCApr 26, 16:50 UTC2h 30m
2026-04-25 EJA701 APA → YUL Apr 25, 22:15 UTCApr 26, 00:10 UTC1h 55m
2026-04-24 EJA701 APA → YUL Apr 24, 19:00 UTCApr 24, 20:50 UTC1h 50m
2026-04-24 EJA701 APA → YUL Apr 24, 15:50 UTCApr 24, 18:05 UTC2h 15m
2026-04-24 EJA701 APA → YUL Apr 24, 14:25 UTCApr 24, 14:55 UTC30m
2026-04-24 EJA701 APA → YUL Apr 24, 12:15 UTCApr 24, 12:50 UTC35m
2026-04-23 EJA701 APA → YUL Apr 23, 10:05 UTCApr 23, 10:50 UTC45m
2026-04-22 EJA701 APA → YUL Apr 22, 19:55 UTCApr 22, 20:50 UTC55m
2026-04-22 EJA701 APA → YUL Apr 22, 14:15 UTCApr 22, 17:20 UTC3h 5m
2026-04-21 EJA701 APA → YUL Apr 21, 19:05 UTCApr 21, 20:45 UTC1h 40m
2026-04-20 EJA701 APA → YUL Apr 20, 21:50 UTCApr 20, 22:25 UTC35m
2026-04-20 EJA701 APA → YUL Apr 20, 17:10 UTCApr 20, 20:45 UTC3h 35m

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 N701QS page for operator, model, and routing details .

Mode-S A959B4 frequently asked

What is Mode-S code A959B4?
A959B4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N701QS.
Where is Mode-S A959B4 registered?
Mode-S code A959B4 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 A959B4 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A959B4, octal 52254664, decimal 11,098,548.
What flights does A959B4 operate?
Mode-S A959B4 has broadcast 2 distinct callsigns, including EJA701, N701QS.