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
Transponder active on ground
Flights observed
704
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
QXE2179 - 7 2026-07-01
QXE2298 - 6 2026-07-09
QXE2283 Horizon Air 6 2026-06-09
QXE2249 - 6 2026-07-13
QXE2166 - 6 2026-07-11
QXE2101 Horizon Air 6 2026-06-14
QXE2087 - 6 2026-07-02
QXE2000 - 6 2026-06-18
QXE2403 Horizon Air 5 2026-06-03
QXE2332 Horizon Air 5 2026-06-03
QXE2331 - 5 2026-06-21
QXE2330 - 5 2026-07-03
QXE2297 - 5 2026-07-10
QXE2274 - 5 2026-07-04
QXE2258 Horizon Air 5 2026-06-20
QXE2184 - 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 QXE2062 - Jul 13, 22:05 UTCJul 14, 02:15 UTC4h 10m
2026-07-13 QXE2139 - Jul 13, 18:25 UTCJul 13, 20:25 UTC2h 0m
2026-07-13 QXE2249 SFO → PAE Jul 13, 15:35 UTCJul 13, 17:00 UTC1h 25m
2026-07-13 QXE2249 SFO → PAE Jul 13, 15:32 UTCJul 13, 17:02 UTC1h 30m
2026-07-13 QXE2112 PDX → SFO Jul 13, 05:50 UTCJul 13, 07:30 UTC1h 40m
2026-07-13 QXE2407 GEG → PDX Jul 13, 03:30 UTCJul 13, 04:20 UTC50m
2026-07-13 QXE2030 - Jul 13, 02:01 UTCJul 13, 02:45 UTC45m
2026-07-13 QXE2264 - Jul 13, 00:05 UTCJul 13, 00:55 UTC50m
2026-07-12 QXE2180 SEA → GEG Jul 12, 22:05 UTCJul 12, 22:58 UTC53m
2026-07-12 QXE2235 BOI → SEA Jul 12, 19:45 UTCJul 12, 20:22 UTC37m
2026-07-12 QXE2235 - Jul 12, 19:25 UTCJul 12, 20:25 UTC1h 0m
2026-07-12 QXE2230 - Jul 12, 17:35 UTCJul 12, 18:40 UTC1h 5m
2026-07-12 QXE2108 - Jul 12, 15:35 UTCJul 12, 16:05 UTC30m
2026-07-12 QXE2432 SEA → PDX Jul 12, 13:50 UTCJul 12, 14:20 UTC30m
2026-07-12 QXE2431 - Jul 12, 12:10 UTCJul 12, 12:40 UTC30m
2026-07-12 QXE2387 SEA → PDX Jul 12, 03:30 UTCJul 12, 04:05 UTC35m
2026-07-12 QXE2387 SEA → PDX Jul 12, 03:30 UTCJul 12, 03:59 UTC29m
2026-07-12 QXE2402 SMF → SEA Jul 12, 00:30 UTCJul 12, 01:50 UTC1h 20m
2026-07-11 QXE2401 SEA → SMF Jul 11, 22:01 UTCJul 11, 23:35 UTC1h 35m
2026-07-11 QXE2401 SEA → SMF Jul 11, 21:57 UTCJul 11, 23:29 UTC1h 32m
2026-07-11 QXE2306 - Jul 11, 20:20 UTCJul 11, 20:55 UTC35m
2026-07-11 QXE2306 - Jul 11, 18:55 UTCJul 11, 19:25 UTC30m
2026-07-11 QXE2166 - Jul 11, 16:25 UTCJul 11, 17:40 UTC1h 15m
2026-07-11 QXE2166 BOI → SEA Jul 11, 16:24 UTCJul 11, 17:32 UTC1h 8m
2026-07-11 QXE2161 - Jul 11, 14:15 UTCJul 11, 15:10 UTC55m
2026-07-11 QXE2218 - Jul 11, 03:10 UTCJul 11, 03:40 UTC30m
2026-07-11 QXE2172 - Jul 11, 01:55 UTCJul 11, 02:25 UTC30m
2026-07-10 QXE2297 - Jul 10, 21:55 UTCJul 10, 23:35 UTC1h 40m
2026-07-10 QXE2368 - Jul 10, 19:20 UTCJul 10, 20:55 UTC1h 35m
2026-07-10 QXE2256 SJC → PDX Jul 10, 16:50 UTCJul 10, 18:10 UTC1h 20m
2026-07-10 QXE2080 - Jul 10, 14:30 UTCJul 10, 15:55 UTC1h 25m
2026-07-10 QXE2098 MFR → PDX Jul 10, 12:30 UTCJul 10, 13:10 UTC40m
2026-07-10 QXE2098 MFR → PDX Jul 10, 12:28 UTCJul 10, 13:18 UTC50m
2026-07-10 QXE2461 - Jul 10, 05:50 UTCJul 10, 06:50 UTC1h 0m
2026-07-10 QXE2352 - Jul 10, 03:35 UTCJul 10, 04:40 UTC1h 5m
2026-07-10 QXE2104 - Jul 10, 01:45 UTCJul 10, 02:35 UTC50m
2026-07-10 QXE2104 PDX → BOI Jul 10, 01:43 UTCJul 10, 02:38 UTC55m
2026-07-09 QXE2003 YVR → PDX Jul 9, 21:15 UTCJul 9, 22:00 UTC45m
2026-07-09 QXE2225 - Jul 9, 19:15 UTCJul 9, 20:10 UTC55m
2026-07-09 QXE2298 OAK → PDX Jul 9, 14:55 UTCJul 9, 16:20 UTC1h 25m
2026-07-09 QXE2298 OAK → PDX Jul 9, 14:54 UTCJul 9, 16:14 UTC1h 20m
2026-07-09 QXE2190 SAN → OAK Jul 9, 00:22 UTCJul 9, 01:11 UTC49m
2026-07-09 QXE2190 - Jul 9, 00:05 UTCJul 9, 01:15 UTC1h 10m
2026-07-08 QXE2320 - Jul 8, 20:15 UTCJul 8, 23:05 UTC2h 50m
2026-07-08 QXE2321 LAX → SEA Jul 8, 16:30 UTCJul 8, 19:10 UTC2h 40m
2026-07-08 QXE2045 - Jul 8, 14:20 UTCJul 8, 15:10 UTC50m
2026-07-08 QXE2049 PDX → OAK Jul 8, 05:30 UTCJul 8, 06:25 UTC55m
2026-07-08 QXE2342 RDM → SEA Jul 8, 02:30 UTCJul 8, 04:25 UTC1h 55m
2026-07-08 QXE2026 - Jul 8, 00:00 UTCJul 8, 01:35 UTC1h 35m
2026-07-07 QXE2025 - Jul 7, 20:55 UTCJul 7, 22:45 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 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?
Mode-S A87CF9 is currently broadcasting from the ground.
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, QXE2179.