Apparatus

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sensors Mode-S transponder

A1638A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N189QS · BOMBARDIER BD-700 Global 7000/7500 · operated by J-M MANUFACTURING CO INC, BANK OF UTAH TRUSTEE, WH POINT INC, TVPX AIRCRAFT SOLUTIONS INC TRUSTEE, WAS AT LLC, ZALAZNICK CONSULTING LLC

Hex
A1638A
Octal
50261612
Decimal
10,576,778
Country
US
Tail
N189QS
Type
GL7T
No current signal · last broadcast 4d ago
Flights observed
44
Distinct callsigns
2
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A1638A.

Country allocation

The ICAO 24-bit address A1638A 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
EJA189 NetJets 33 2026-05-25
N189QS - 11 2026-05-22

Recent flights last 44

DateFlightRouteTakeoffLandingDuration
2026-05-25 EJA189 BUR → BED May 25, 18:35 UTCMay 25, 19:54 UTC1h 19m
2026-05-23 EJA189 BUR → BED May 23, 00:35 UTCMay 23, 01:45 UTC1h 10m
2026-05-22 N189QS - May 22, 21:40 UTCMay 22, 22:50 UTC1h 10m
2026-05-21 N189QS - May 21, 18:00 UTCMay 21, 19:25 UTC1h 25m
2026-05-21 EJA189 BUR → BED May 21, 14:30 UTCMay 21, 16:05 UTC1h 35m
2026-05-19 EJA189 BUR → BED May 19, 14:35 UTCMay 19, 17:20 UTC2h 45m
2026-05-18 EJA189 BUR → BED May 18, 16:25 UTCMay 18, 21:40 UTC5h 14m
2026-05-15 N189QS - May 15, 14:50 UTCMay 15, 16:15 UTC1h 25m
2026-05-15 N189QS - May 15, 08:10 UTCMay 15, 14:45 UTC6h 35m
2026-05-14 N189QS - May 14, 11:10 UTCMay 14, 12:25 UTC1h 15m
2026-05-12 N189QS - May 12, 04:25 UTCMay 12, 06:05 UTC1h 40m
2026-05-10 EJA189 BUR → BED May 10, 20:14 UTCMay 10, 22:55 UTC2h 40m
2026-05-10 EJA189 BUR → BED May 10, 18:05 UTCMay 10, 18:25 UTC20m
2026-05-09 EJA189 BUR → BED May 9, 19:35 UTCMay 9, 21:00 UTC1h 25m
2026-05-05 EJA189 BUR → BED May 5, 19:40 UTCMay 5, 20:10 UTC30m
2026-05-02 EJA189 BUR → BED May 2, 15:10 UTCMay 2, 17:50 UTC2h 40m
2026-05-01 N189QS - May 1, 07:45 UTCMay 1, 14:10 UTC6h 25m
2026-04-29 N189QS - Apr 29, 19:15 UTCApr 30, 04:20 UTC9h 4m
2026-04-28 EJA189 BUR → BED Apr 28, 01:25 UTCApr 28, 02:10 UTC45m
2026-04-22 N189QS ANC → SJC Apr 22, 17:45 UTCApr 22, 21:45 UTC4h 0m
2026-04-21 N189QS - Apr 21, 18:55 UTCApr 22, 01:25 UTC6h 30m
2026-04-21 EJA189 BUR → BED Apr 21, 14:10 UTCApr 21, 15:55 UTC1h 45m
2026-04-20 EJA189 BUR → BED Apr 20, 22:30 UTCApr 20, 23:10 UTC40m
2026-04-20 EJA189 BUR → BED Apr 20, 18:50 UTCApr 20, 21:35 UTC2h 45m
2026-04-20 EJA189 BUR → BED Apr 20, 15:00 UTCApr 20, 17:15 UTC2h 15m
2026-04-19 EJA189 BUR → BED Apr 19, 21:35 UTCApr 19, 22:15 UTC40m
2026-04-19 N189QS - Apr 19, 15:05 UTCApr 19, 20:40 UTC5h 35m
2026-04-18 EJA189 BUR → BED Apr 18, 19:15 UTCApr 18, 23:55 UTC4h 40m
2026-04-18 EJA189 BUR → BED Apr 18, 16:05 UTCApr 18, 16:35 UTC30m
2026-04-17 EJA189 BUR → BED Apr 17, 19:25 UTCApr 17, 20:15 UTC50m
2026-04-17 EJA189 BUR → BED Apr 17, 17:25 UTCApr 17, 17:40 UTC15m
2026-04-17 EJA189 BUR → BED Apr 17, 15:20 UTCApr 17, 17:15 UTC1h 55m
2026-04-16 EJA189 BUR → BED Apr 16, 01:10 UTCApr 16, 01:25 UTC15m
2026-04-16 EJA189 BUR → BED Apr 16, 00:05 UTCApr 16, 01:05 UTC1h 0m
2026-04-15 EJA189 BUR → BED Apr 15, 19:30 UTCApr 15, 20:20 UTC50m
2026-04-14 EJA189 BUR → BED Apr 14, 18:55 UTCApr 14, 19:05 UTC10m
2026-04-14 EJA189 BUR → BED Apr 14, 17:50 UTCApr 14, 18:45 UTC55m
2026-04-14 EJA189 BUR → BED Apr 14, 16:50 UTCApr 14, 17:05 UTC15m
2026-04-14 EJA189 BUR → BED Apr 14, 14:50 UTCApr 14, 16:45 UTC1h 55m
2026-04-14 EJA189 BUR → BED Apr 14, 14:20 UTCApr 14, 14:45 UTC25m
2026-04-14 EJA189 BUR → BED Apr 14, 12:00 UTCApr 14, 12:30 UTC30m
2026-04-13 EJA189 BUR → BED Apr 13, 19:55 UTCApr 13, 22:10 UTC2h 15m
2026-04-13 EJA189 BUR → BED Apr 13, 00:20 UTCApr 13, 00:40 UTC20m
2026-04-12 EJA189 BUR → BED Apr 12, 23:55 UTCApr 13, 00:40 UTC45m

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 N189QS page for operator, model, and routing details .

Mode-S A1638A frequently asked

What is Mode-S code A1638A?
A1638A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N189QS.
Where is Mode-S A1638A registered?
Mode-S code A1638A 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 A1638A broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1638A, octal 50261612, decimal 10,576,778.
What flights does A1638A operate?
Mode-S A1638A has broadcast 2 distinct callsigns, including EJA189, N189QS.