Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A21C82

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N235QS · BOMBARDIER CL-600 Challenger · operated by NETJETS SALES INC, EDWARDS LIFESCIENCES LLC, HULSIZER AVIATION LLC, DAY MICHAEL, NJ18 LLC, RICHARD A FRIEDMAN LLC

Hex
A21C82
Octal
50416202
Decimal
10,624,130
Country
US
Tail
N235QS
Type
CL60
No current signal · last broadcast 2d ago
Flights observed
93
Distinct callsigns
2
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A21C82.

Country allocation

The ICAO 24-bit address A21C82 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
EJA235 NetJets 76 2026-05-28
N235QS - 17 2026-05-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-28 EJA235 SFO → IAD May 28, 01:00 UTCMay 28, 01:50 UTC50m
2026-05-27 EJA235 SFO → IAD May 27, 22:40 UTCMay 27, 23:35 UTC55m
2026-05-27 EJA235 SFO → IAD May 27, 16:25 UTCMay 27, 17:45 UTC1h 20m
2026-05-26 EJA235 SFO → IAD May 26, 23:19 UTCMay 27, 00:59 UTC1h 40m
2026-05-26 EJA235 SFO → IAD May 26, 21:29 UTCMay 26, 22:25 UTC55m
2026-05-26 EJA235 SFO → IAD May 26, 17:44 UTCMay 26, 19:55 UTC2h 10m
2026-05-26 EJA235 SFO → IAD May 26, 14:45 UTCMay 26, 16:00 UTC1h 15m
2026-05-25 EJA235 SFO → IAD May 25, 21:30 UTCMay 25, 22:49 UTC1h 20m
2026-05-25 EJA235 SFO → IAD May 25, 18:40 UTCMay 25, 19:15 UTC35m
2026-05-25 EJA235 SFO → IAD May 25, 17:05 UTCMay 25, 17:45 UTC40m
2026-05-25 EJA235 SFO → IAD May 25, 15:15 UTCMay 25, 15:30 UTC15m
2026-05-24 EJA235 SFO → IAD May 24, 15:05 UTCMay 24, 17:15 UTC2h 10m
2026-05-23 EJA235 SFO → IAD May 23, 14:50 UTCMay 23, 15:45 UTC55m
2026-05-23 EJA235 SFO → IAD May 23, 11:50 UTCMay 23, 13:00 UTC1h 10m
2026-05-22 EJA235 SFO → IAD May 22, 02:10 UTCMay 22, 02:30 UTC20m
2026-05-20 EJA235 SFO → IAD May 20, 17:15 UTCMay 20, 19:05 UTC1h 50m
2026-05-20 EJA235 SFO → IAD May 20, 15:00 UTCMay 20, 15:25 UTC25m
2026-05-20 EJA235 SFO → IAD May 20, 13:05 UTCMay 20, 14:25 UTC1h 20m
2026-05-18 EJA235 SFO → IAD May 18, 00:55 UTCMay 18, 02:55 UTC2h 0m
2026-05-17 EJA235 SFO → IAD May 17, 22:40 UTCMay 17, 23:25 UTC45m
2026-05-16 EJA235 SFO → IAD May 16, 12:05 UTCMay 16, 12:16 UTC10m
2026-05-15 N235QS - May 15, 19:40 UTCMay 15, 20:20 UTC40m
2026-05-15 N235QS - May 15, 16:10 UTCMay 15, 16:45 UTC35m
2026-05-15 EJA235 SFO → IAD May 15, 13:40 UTCMay 15, 14:05 UTC25m
2026-05-14 EJA235 SFO → IAD May 14, 18:00 UTCMay 14, 19:30 UTC1h 30m
2026-05-14 EJA235 SFO → IAD May 14, 15:30 UTCMay 14, 16:15 UTC45m
2026-05-13 EJA235 SFO → IAD May 13, 20:55 UTCMay 13, 21:35 UTC40m
2026-05-13 EJA235 SFO → IAD May 13, 19:35 UTCMay 13, 20:30 UTC55m
2026-05-13 EJA235 SFO → IAD May 13, 14:40 UTCMay 13, 15:25 UTC45m
2026-05-13 EJA235 SFO → IAD May 13, 13:31 UTCMay 13, 14:00 UTC30m
2026-05-12 EJA235 SFO → IAD May 12, 19:50 UTCMay 12, 22:05 UTC2h 15m
2026-05-12 EJA235 SFO → IAD May 12, 17:00 UTCMay 12, 18:35 UTC1h 35m
2026-05-12 EJA235 SFO → IAD May 12, 14:50 UTCMay 12, 16:05 UTC1h 15m
2026-05-11 N235QS - May 11, 17:00 UTCMay 11, 17:50 UTC50m
2026-05-10 N235QS CLD → AUS May 10, 19:05 UTCMay 11, 17:50 UTC22h 46m
2026-05-10 EJA235 SFO → IAD May 10, 13:40 UTCMay 10, 16:20 UTC2h 40m
2026-05-06 EJA235 SFO → IAD May 6, 01:10 UTCMay 6, 02:55 UTC1h 45m
2026-05-05 EJA235 SFO → IAD May 5, 21:15 UTCMay 6, 00:25 UTC3h 10m
2026-05-05 EJA235 SFO → IAD May 5, 19:10 UTCMay 5, 20:05 UTC55m
2026-05-04 EJA235 SFO → IAD May 4, 20:10 UTCMay 4, 22:20 UTC2h 10m
2026-05-04 EJA235 SFO → IAD May 4, 14:05 UTCMay 4, 15:35 UTC1h 30m
2026-05-04 EJA235 SFO → IAD May 4, 04:44 UTCMay 4, 06:10 UTC1h 25m
2026-05-04 N235QS - May 4, 03:15 UTCMay 4, 03:45 UTC30m
2026-05-03 N235QS - May 3, 23:04 UTCMay 3, 23:15 UTC10m
2026-05-02 N235QS - May 2, 22:40 UTCMay 2, 23:10 UTC30m
2026-05-02 N235QS - May 2, 16:35 UTCMay 2, 21:10 UTC4h 35m
2026-05-01 EJA235 SFO → IAD May 1, 23:00 UTCMay 2, 00:05 UTC1h 5m
2026-04-30 EJA235 SFO → IAD Apr 30, 22:45 UTCMay 1, 03:10 UTC4h 25m
2026-04-30 EJA235 SFO → IAD Apr 30, 19:20 UTCApr 30, 20:30 UTC1h 10m
2026-04-30 EJA235 SFO → IAD Apr 30, 16:25 UTCApr 30, 18:15 UTC1h 50m

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 N235QS page for operator, model, and routing details .

Mode-S A21C82 frequently asked

What is Mode-S code A21C82?
A21C82 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N235QS.
Where is Mode-S A21C82 registered?
Mode-S code A21C82 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 A21C82 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21C82, octal 50416202, decimal 10,624,130.
What flights does A21C82 operate?
Mode-S A21C82 has broadcast 2 distinct callsigns, including EJA235, N235QS.