Apparatus

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sensors Mode-S transponder

A87CF9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N646QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A87CF9
Octal
52076371
Decimal
11,042,041
Country
US
Tail
N646QX
Type
E75L
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
821
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S A87CF9.

Country allocation

The ICAO 24-bit address A87CF9 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 20 distinct

Callsign Airline Flights Last seen
QXE2285 Horizon Air 14 2026-06-03
QXE2003 - 9 2026-07-09
QXE2344 Horizon Air 8 2026-06-03
QXE2098 - 8 2026-07-10
QXE2277 - 7 2026-07-18
QXE2179 - 7 2026-07-01
QXE2000 Horizon Air 7 2026-07-26
QXE2404 Horizon Air 6 2026-07-25
QXE2398 Horizon Air 6 2026-07-19
QXE2298 - 6 2026-07-09
QXE2283 Horizon Air 6 2026-06-09
QXE2249 - 6 2026-07-13
QXE2226 - 6 2026-07-19
QXE2166 - 6 2026-07-11
QXE2158 - 6 2026-07-15
QXE2101 Horizon Air 6 2026-06-14
QXE2087 - 6 2026-07-02
QXE2015 Horizon Air 6 2026-07-25
QXE2461 Horizon Air 5 2026-07-26
QXE2420 - 5 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2000 ANC → OTZ Jul 26, 21:20 UTCJul 26, 21:45 UTC25m
2026-07-26 QXE2001 PSP → SFO Jul 26, 19:40 UTCJul 26, 19:50 UTC10m
2026-07-26 QXE2171 PDX → OAK Jul 26, 17:50 UTCJul 26, 18:30 UTC40m
2026-07-26 QXE2195 SEA → BIL Jul 26, 16:16 UTCJul 26, 16:49 UTC33m
2026-07-26 QXE2195 SEA → BIL Jul 26, 16:20 UTCJul 26, 16:50 UTC30m
2026-07-26 QXE2452 MFR → SEA Jul 26, 13:10 UTCJul 26, 14:10 UTC1h 0m
2026-07-26 QXE2452 MFR → SEA Jul 26, 13:08 UTCJul 26, 14:02 UTC54m
2026-07-26 QXE2461 SEA → MFR Jul 26, 05:50 UTCJul 26, 06:55 UTC1h 6m
2026-07-26 QXE2461 SEA → MFR Jul 26, 05:48 UTCJul 26, 06:46 UTC58m
2026-07-26 QXE2352 PSP → SFO Jul 26, 03:00 UTCJul 26, 04:05 UTC1h 5m
2026-07-26 QXE2109 SJC → PDX Jul 26, 00:55 UTCJul 26, 01:50 UTC55m
2026-07-25 QXE2015 GEG → BOI Jul 25, 23:17 UTCJul 25, 23:39 UTC22m
2026-07-25 QXE2015 GEG → BOI Jul 25, 23:20 UTCJul 25, 23:45 UTC25m
2026-07-25 QXE2006 OAK → PDX Jul 25, 21:33 UTCJul 25, 22:09 UTC36m
2026-07-25 QXE2006 OAK → PDX Jul 25, 21:35 UTCJul 25, 22:10 UTC35m
2026-07-25 QXE2159 RDM → SEA Jul 25, 18:00 UTCJul 25, 19:10 UTC1h 10m
2026-07-25 QXE2031 MFR → SEA Jul 25, 16:05 UTCJul 25, 16:50 UTC45m
2026-07-25 QXE2404 PDX → GEG Jul 25, 14:15 UTCJul 25, 15:00 UTC45m
2026-07-25 QXE2404 PDX → GEG Jul 25, 14:12 UTCJul 25, 14:54 UTC42m
2026-07-25 QXE2387 SJC → SAN Jul 25, 03:55 UTCJul 25, 04:25 UTC30m
2026-07-25 QXE2366 SFO → LAX Jul 25, 01:45 UTCJul 25, 02:30 UTC45m
2026-07-25 QXE2366 SFO → LAX Jul 25, 01:41 UTCJul 25, 02:14 UTC33m
2026-07-25 QXE2367 SEA → PSC Jul 25, 00:15 UTCJul 25, 00:45 UTC30m
2026-07-24 QXE2359 PDX → MSO Jul 24, 22:00 UTCJul 24, 22:20 UTC20m
2026-07-24 QXE2149 SFO → LAX Jul 24, 20:30 UTCJul 24, 20:55 UTC25m
2026-07-24 QXE2159 RDM → SEA Jul 24, 18:00 UTCJul 24, 19:10 UTC1h 10m
2026-07-24 QXE2031 MFR → SEA Jul 24, 15:55 UTCJul 24, 16:45 UTC50m
2026-07-24 QXE2404 PDX → GEG Jul 24, 14:10 UTCJul 24, 14:55 UTC45m
2026-07-24 QXE2053 PDX → SEA Jul 24, 12:30 UTCJul 24, 12:55 UTC25m
2026-07-24 QXE2047 MRY → SEA Jul 24, 06:00 UTCJul 24, 06:40 UTC40m
2026-07-24 QXE2313 PAE → SFO Jul 24, 02:55 UTCJul 24, 03:25 UTC30m
2026-07-24 QXE2302 SEA → SMF Jul 24, 01:15 UTCJul 24, 01:45 UTC30m
2026-07-23 QXE2350 PDX → GEG Jul 23, 23:05 UTCJul 23, 23:50 UTC45m
2026-07-23 QXE2349 YYC → SEA Jul 23, 21:05 UTCJul 23, 21:45 UTC40m
2026-07-23 QXE2262 RDM → SEA Jul 23, 18:55 UTCJul 23, 19:40 UTC45m
2026-07-23 QXE2262 RDM → SEA Jul 23, 18:58 UTCJul 23, 19:35 UTC37m
2026-07-23 QXE2200 RDM → SEA Jul 23, 17:25 UTCJul 23, 18:00 UTC35m
2026-07-23 QXE2200 RDM → SEA Jul 23, 17:17 UTCJul 23, 18:01 UTC44m
2026-07-23 QXE2027 PDX → SFO Jul 23, 14:30 UTCJul 23, 15:20 UTC50m
2026-07-23 QXE2094 SEA → SMF Jul 23, 07:05 UTCJul 23, 07:45 UTC40m
2026-07-22 QXE2191 SAN → SFO Jul 22, 22:00 UTCJul 23, 05:50 UTC7h 50m
2026-07-22 QXE2143 OAK → PDX Jul 22, 18:15 UTCJul 22, 20:15 UTC2h 0m
2026-07-22 QXE2142 SEA → EUG Jul 22, 15:10 UTCJul 22, 17:15 UTC2h 5m
2026-07-22 QXE2067 PUW → SEA Jul 22, 12:50 UTCJul 22, 13:45 UTC55m
2026-07-22 QXE2352 PSP → SFO Jul 22, 03:05 UTCJul 22, 04:10 UTC1h 5m
2026-07-22 QXE2109 SJC → PDX Jul 22, 01:10 UTCJul 22, 02:15 UTC1h 5m
2026-07-21 QXE2117 SJC → PDX Jul 21, 20:45 UTCJul 22, 00:00 UTC3h 15m
2026-07-21 QXE2117 SJC → PDX Jul 21, 16:50 UTCJul 21, 19:55 UTC3h 5m
2026-07-21 QXE2420 - Jul 21, 14:30 UTCJul 21, 15:00 UTC30m
2026-07-21 QXE2420 PDX → SEA Jul 21, 14:35 UTCJul 21, 14:51 UTC16m

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 N646QX page for operator, model, and routing details .

Mode-S A87CF9 frequently asked

What is Mode-S code A87CF9?
A87CF9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N646QX.
Where is Mode-S A87CF9 registered?
Mode-S code A87CF9 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 A87CF9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A87CF9, octal 52076371, decimal 11,042,041.
What flights does A87CF9 operate?
Mode-S A87CF9 has broadcast 20 distinct callsigns, including QXE2285, QXE2003, QXE2344, QXE2098, QXE2277.