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 15d ago
Flights observed
176
Distinct callsigns
2
Country
US
Last broadcast
15d 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 - 172 2026-07-02
N643QS - 4 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-02 EJA643 STL → BGR Jul 2, 19:30 UTCJul 2, 22:00 UTC2h 30m
2026-07-02 EJA643 - Jul 2, 16:50 UTCJul 2, 18:35 UTC1h 45m
2026-06-30 EJA643 - Jun 30, 15:15 UTCJun 30, 16:50 UTC1h 35m
2026-06-29 EJA643 - Jun 29, 21:24 UTCJun 30, 00:00 UTC2h 35m
2026-06-28 EJA643 - Jun 28, 15:14 UTCJun 28, 18:14 UTC3h 0m
2026-06-28 EJA643 - Jun 28, 00:30 UTCJun 28, 01:10 UTC40m
2026-06-27 EJA643 - Jun 27, 17:09 UTCJun 27, 23:34 UTC6h 25m
2026-06-22 EJA643 - Jun 22, 23:45 UTCJun 23, 00:54 UTC1h 10m
2026-06-22 EJA643 - Jun 22, 21:30 UTCJun 22, 22:30 UTC1h 0m
2026-06-22 EJA643 - Jun 22, 20:00 UTCJun 22, 20:44 UTC45m
2026-06-22 EJA643 - Jun 22, 14:55 UTCJun 22, 18:54 UTC4h 0m
2026-06-19 EJA643 CNW → DAL Jun 19, 18:49 UTCJun 19, 19:39 UTC50m
2026-06-19 EJA643 - Jun 19, 16:34 UTCJun 19, 17:29 UTC55m
2026-06-19 EJA643 - Jun 19, 12:44 UTCJun 19, 15:29 UTC2h 45m
2026-06-19 EJA643 - Jun 19, 00:20 UTCJun 19, 00:45 UTC25m
2026-06-18 EJA643 - Jun 18, 21:05 UTCJun 18, 23:25 UTC2h 20m
2026-06-18 EJA643 - Jun 18, 18:30 UTCJun 18, 19:45 UTC1h 15m
2026-06-18 EJA643 - Jun 18, 16:35 UTCJun 18, 17:25 UTC50m
2026-06-17 EJA643 - Jun 17, 22:05 UTCJun 18, 00:35 UTC2h 30m
2026-06-17 EJA643 - Jun 17, 18:56 UTCJun 17, 20:30 UTC1h 35m
2026-06-17 EJA643 - Jun 17, 15:50 UTCJun 17, 16:40 UTC50m
2026-06-17 EJA643 MOD → SJC Jun 17, 02:25 UTCJun 17, 03:35 UTC1h 10m
2026-06-16 EJA643 MOD → SJC Jun 16, 20:20 UTCJun 16, 21:10 UTC50m
2026-06-16 EJA643 MOD → SJC Jun 16, 16:30 UTCJun 16, 18:05 UTC1h 35m
2026-06-15 EJA643 MOD → SJC Jun 15, 21:30 UTCJun 15, 23:04 UTC1h 35m
2026-06-15 EJA643 MOD → SJC Jun 15, 18:29 UTCJun 15, 20:04 UTC1h 35m
2026-06-14 EJA643 MOD → SJC Jun 14, 19:25 UTCJun 14, 20:10 UTC45m
2026-06-14 EJA643 MOD → SJC Jun 14, 17:25 UTCJun 14, 18:10 UTC45m
2026-06-14 EJA643 MOD → SJC Jun 14, 14:15 UTCJun 14, 15:55 UTC1h 40m
2026-06-14 EJA643 MOD → SJC Jun 14, 00:00 UTCJun 14, 00:50 UTC50m
2026-06-13 EJA643 MOD → SJC Jun 13, 21:10 UTCJun 13, 22:45 UTC1h 35m
2026-06-13 EJA643 MOD → SJC Jun 13, 19:40 UTCJun 13, 20:10 UTC30m
2026-06-12 EJA643 MOD → SJC Jun 12, 17:40 UTCJun 12, 17:55 UTC15m
2026-06-12 EJA643 MOD → SJC Jun 12, 15:20 UTCJun 12, 16:40 UTC1h 20m
2026-06-12 EJA643 MOD → SJC Jun 12, 11:25 UTCJun 12, 14:15 UTC2h 50m
2026-06-11 EJA643 MOD → SJC Jun 11, 17:55 UTCJun 11, 18:40 UTC45m
2026-06-11 EJA643 MOD → SJC Jun 11, 16:05 UTCJun 11, 16:50 UTC45m
2026-06-11 EJA643 MOD → SJC Jun 11, 14:20 UTCJun 11, 15:05 UTC45m
2026-06-11 EJA643 MOD → SJC Jun 11, 11:10 UTCJun 11, 12:35 UTC1h 25m
2026-06-10 EJA643 MOD → SJC Jun 10, 21:55 UTCJun 10, 22:10 UTC15m
2026-06-10 EJA643 MOD → SJC Jun 10, 18:05 UTCJun 10, 19:30 UTC1h 25m
2026-06-10 EJA643 MOD → SJC Jun 10, 15:30 UTCJun 10, 17:25 UTC1h 55m
2026-06-10 EJA643 MOD → SJC Jun 10, 13:20 UTCJun 10, 13:50 UTC30m
2026-06-10 EJA643 MOD → SJC Jun 10, 11:45 UTCJun 10, 12:30 UTC45m
2026-06-09 EJA643 MOD → SJC Jun 9, 19:20 UTCJun 9, 20:25 UTC1h 5m
2026-06-09 EJA643 MOD → SJC Jun 9, 17:30 UTCJun 9, 18:20 UTC50m
2026-06-09 EJA643 MOD → SJC Jun 9, 14:35 UTCJun 9, 15:50 UTC1h 15m
2026-06-09 EJA643 MOD → SJC Jun 9, 11:45 UTCJun 9, 13:55 UTC2h 10m
2026-06-08 EJA643 MOD → SJC Jun 8, 15:30 UTCJun 8, 18:15 UTC2h 45m
2026-06-08 EJA643 MOD → SJC Jun 8, 13:20 UTCJun 8, 13:55 UTC35m

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 15d 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.