Apparatus

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sensors Mode-S transponder

A871CF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N643QS · CESSNA 560XL Citation XLS · operated by NETJETS SALES INC

Hex
A871CF
Octal
52070717
Decimal
11,039,183
Country
US
Tail
N643QS
Type
C56X
No current signal · last broadcast 1h ago
Flights observed
116
Distinct callsigns
2
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A871CF.

Country allocation

The ICAO 24-bit address A871CF 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
EJA643 NetJets 112 2026-06-02
N643QS - 4 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 N643QS AUS → DAL Jun 2, 23:50 UTCJun 3, 01:05 UTC1h 15m
2026-06-02 EJA643 MOD → SJC Jun 2, 16:20 UTCJun 2, 16:30 UTC10m
2026-06-01 EJA643 MOD → SJC Jun 1, 22:55 UTCJun 1, 23:30 UTC35m
2026-06-01 EJA643 MOD → SJC Jun 1, 20:50 UTCJun 1, 21:20 UTC30m
2026-06-01 EJA643 MOD → SJC Jun 1, 16:55 UTCJun 1, 17:25 UTC30m
2026-06-01 EJA643 MOD → SJC Jun 1, 13:30 UTCJun 1, 14:05 UTC35m
2026-05-31 EJA643 MOD → SJC May 31, 23:05 UTCJun 1, 00:20 UTC1h 15m
2026-05-31 EJA643 MOD → SJC May 31, 20:20 UTCMay 31, 21:45 UTC1h 25m
2026-05-31 EJA643 MOD → SJC May 31, 17:50 UTCMay 31, 18:40 UTC50m
2026-05-28 EJA643 MOD → SJC May 28, 01:45 UTCMay 28, 02:50 UTC1h 5m
2026-05-27 EJA643 MOD → SJC May 27, 22:20 UTCMay 27, 23:15 UTC55m
2026-05-27 EJA643 MOD → SJC May 27, 00:49 UTCMay 27, 01:34 UTC45m
2026-05-26 EJA643 MOD → SJC May 26, 22:44 UTCMay 26, 23:25 UTC40m
2026-05-26 EJA643 MOD → SJC May 26, 20:09 UTCMay 26, 20:40 UTC30m
2026-05-26 EJA643 MOD → SJC May 26, 18:30 UTCMay 26, 19:15 UTC45m
2026-05-26 EJA643 MOD → SJC May 26, 15:05 UTCMay 26, 17:20 UTC2h 15m
2026-05-25 EJA643 MOD → SJC May 25, 21:24 UTCMay 25, 22:15 UTC50m
2026-05-25 EJA643 MOD → SJC May 25, 17:55 UTCMay 25, 18:40 UTC45m
2026-05-22 EJA643 MOD → SJC May 22, 22:05 UTCMay 22, 22:25 UTC20m
2026-05-22 EJA643 MOD → SJC May 22, 20:05 UTCMay 22, 20:55 UTC50m
2026-05-22 EJA643 MOD → SJC May 22, 16:45 UTCMay 22, 18:40 UTC1h 55m
2026-05-20 EJA643 MOD → SJC May 20, 21:25 UTCMay 20, 22:05 UTC40m
2026-05-20 EJA643 MOD → SJC May 20, 18:00 UTCMay 20, 19:10 UTC1h 10m
2026-05-20 EJA643 MOD → SJC May 20, 14:00 UTCMay 20, 16:05 UTC2h 5m
2026-05-20 EJA643 MOD → SJC May 20, 12:05 UTCMay 20, 12:50 UTC45m
2026-05-19 EJA643 MOD → SJC May 19, 19:40 UTCMay 19, 23:45 UTC4h 5m
2026-05-19 EJA643 MOD → SJC May 19, 15:50 UTCMay 19, 17:40 UTC1h 50m
2026-05-19 EJA643 MOD → SJC May 19, 13:10 UTCMay 19, 14:50 UTC1h 40m
2026-05-18 EJA643 MOD → SJC May 18, 22:30 UTCMay 18, 23:40 UTC1h 10m
2026-05-18 EJA643 MOD → SJC May 18, 20:00 UTCMay 18, 21:35 UTC1h 35m
2026-05-14 EJA643 MOD → SJC May 14, 23:10 UTCMay 15, 00:45 UTC1h 35m
2026-05-14 EJA643 MOD → SJC May 14, 21:00 UTCMay 14, 21:40 UTC40m
2026-05-14 EJA643 MOD → SJC May 14, 20:05 UTCMay 14, 20:25 UTC20m
2026-05-14 EJA643 MOD → SJC May 14, 16:55 UTCMay 14, 18:55 UTC2h 0m
2026-05-13 EJA643 MOD → SJC May 13, 23:05 UTCMay 13, 23:40 UTC35m
2026-05-13 EJA643 MOD → SJC May 13, 19:40 UTCMay 13, 19:50 UTC10m
2026-05-13 EJA643 MOD → SJC May 13, 17:50 UTCMay 13, 18:50 UTC1h 0m
2026-05-13 EJA643 MOD → SJC May 13, 16:15 UTCMay 13, 16:50 UTC35m
2026-05-13 EJA643 MOD → SJC May 13, 12:15 UTCMay 13, 14:55 UTC2h 40m
2026-05-12 EJA643 MOD → SJC May 12, 22:15 UTCMay 13, 00:25 UTC2h 10m
2026-05-12 EJA643 MOD → SJC May 12, 15:05 UTCMay 12, 17:55 UTC2h 50m
2026-05-12 EJA643 MOD → SJC May 12, 13:15 UTCMay 12, 14:05 UTC50m
2026-05-11 EJA643 MOD → SJC May 11, 20:20 UTCMay 11, 20:50 UTC30m
2026-05-11 EJA643 MOD → SJC May 11, 15:00 UTCMay 11, 17:05 UTC2h 5m
2026-05-11 EJA643 MOD → SJC May 11, 13:40 UTCMay 11, 14:05 UTC25m
2026-05-11 EJA643 MOD → SJC May 11, 11:20 UTCMay 11, 13:00 UTC1h 40m
2026-05-09 EJA643 MOD → SJC May 9, 18:45 UTCMay 9, 19:10 UTC25m
2026-05-09 EJA643 MOD → SJC May 9, 15:55 UTCMay 9, 16:55 UTC1h 0m
2026-05-09 EJA643 MOD → SJC May 9, 13:00 UTCMay 9, 15:10 UTC2h 10m
2026-05-08 EJA643 MOD → SJC May 8, 21:25 UTCMay 8, 22:45 UTC1h 20m

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 N643QS page for operator, model, and routing details .

Mode-S A871CF frequently asked

What is Mode-S code A871CF?
A871CF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N643QS.
Where is Mode-S A871CF registered?
Mode-S code A871CF 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 A871CF broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A871CF, octal 52070717, decimal 11,039,183.
What flights does A871CF operate?
Mode-S A871CF has broadcast 2 distinct callsigns, including EJA643, N643QS.