Apparatus

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sensors Mode-S transponder

A8609F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N639QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A8609F
Octal
52060237
Decimal
11,034,783
Country
US
Tail
N639QX
Type
E75L
No current signal · last broadcast Jul 26, 19:50 UTC
Flights observed
819
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Last known position

Most recent position reported by Mode-S A8609F.

Country allocation

The ICAO 24-bit address A8609F 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
QXE2400 - 13 2026-07-17
QXE2286 Horizon Air 11 2026-07-22
QXE2113 - 10 2026-07-09
QXE2347 - 9 2026-07-23
QXE2076 - 8 2026-07-13
QXE2399 - 7 2026-07-16
QXE2346 Horizon Air 7 2026-07-23
QXE2329 - 7 2026-07-09
QXE2328 Horizon Air 7 2026-07-20
QXE2275 - 7 2026-06-30
QXE2001 Horizon Air 7 2026-07-25
QXE2443 Horizon Air 6 2026-05-10
QXE2430 Horizon Air 6 2026-05-09
QXE2306 Horizon Air 6 2026-06-28
QXE2287 Horizon Air 6 2026-07-22
QXE2276 - 6 2026-07-12
QXE2271 - 6 2026-07-12
QXE2202 - 6 2026-07-17
QXE2182 - 6 2026-07-17
QXE2178 - 6 2026-06-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2397 SBA → SEA Jul 26, 18:00 UTCJul 26, 19:45 UTC1h 45m
2026-07-26 QXE2396 SFO → PAE Jul 26, 04:45 UTCJul 26, 06:50 UTC2h 6m
2026-07-26 QXE2372 LAX → SFO Jul 26, 02:50 UTCJul 26, 03:20 UTC30m
2026-07-26 QXE2016 SEA → OAK Jul 26, 01:00 UTCJul 26, 01:35 UTC35m
2026-07-25 QXE2007 SJC → AUS Jul 25, 23:15 UTCJul 25, 23:50 UTC35m
2026-07-25 QXE2000 ANC → OTZ Jul 25, 21:30 UTCJul 25, 22:00 UTC30m
2026-07-25 QXE2001 PSP → SFO Jul 25, 20:05 UTCJul 25, 20:15 UTC10m
2026-07-25 QXE2171 PDX → OAK Jul 25, 17:50 UTCJul 25, 18:25 UTC35m
2026-07-25 QXE2195 SEA → BIL Jul 25, 16:20 UTCJul 25, 16:50 UTC30m
2026-07-25 QXE2195 SEA → BIL Jul 25, 16:14 UTCJul 25, 16:48 UTC34m
2026-07-25 QXE2165 ANC → BET Jul 25, 13:30 UTCJul 25, 14:05 UTC35m
2026-07-25 QXE2403 SJC → SEA Jul 25, 05:55 UTCJul 25, 06:25 UTC30m
2026-07-25 QXE2403 SJC → SEA Jul 25, 05:53 UTCJul 25, 06:25 UTC32m
2026-07-25 QXE2327 SJC → SEA Jul 25, 02:35 UTCJul 25, 03:55 UTC1h 20m
2026-07-25 QXE2322 SJC → PDX Jul 25, 00:15 UTCJul 25, 01:15 UTC1h 0m
2026-07-25 QXE2322 SJC → PDX Jul 25, 00:14 UTCJul 25, 01:27 UTC1h 13m
2026-07-24 QXE2119 SAN → SFO Jul 24, 22:05 UTCJul 24, 22:50 UTC45m
2026-07-24 QXE2020 SFO → PHX Jul 24, 19:00 UTCJul 24, 21:10 UTC2h 10m
2026-07-24 QXE2020 SFO → PHX Jul 24, 19:02 UTCJul 24, 21:11 UTC2h 9m
2026-07-24 QXE2270 SEA → FCA Jul 24, 15:15 UTCJul 24, 17:55 UTC2h 40m
2026-07-24 QXE2116 SNA → PAE Jul 24, 02:45 UTCJul 24, 05:05 UTC2h 20m
2026-07-23 QXE2019 SEA → PDX Jul 23, 23:10 UTCJul 24, 01:50 UTC2h 40m
2026-07-23 QXE2259 SAN → SFO Jul 23, 21:30 UTCJul 23, 22:10 UTC40m
2026-07-23 QXE2259 SAN → SFO Jul 23, 21:33 UTCJul 23, 22:09 UTC36m
2026-07-23 QXE2106 RDM → SFO Jul 23, 19:30 UTCJul 23, 20:30 UTC1h 0m
2026-07-23 QXE2179 SAN → PAE Jul 23, 17:00 UTCJul 23, 17:50 UTC50m
2026-07-23 QXE2072 SEA → FCA Jul 23, 15:05 UTCJul 23, 15:55 UTC50m
2026-07-23 QXE2072 SEA → FCA Jul 23, 15:02 UTCJul 23, 15:50 UTC48m
2026-07-23 QXE2347 - Jul 23, 13:35 UTCJul 23, 13:55 UTC20m
2026-07-23 QXE2347 YKM → SEA Jul 23, 13:24 UTCJul 23, 13:46 UTC22m
2026-07-23 QXE2346 PDX → SEA Jul 23, 07:00 UTCJul 23, 07:20 UTC20m
2026-07-23 QXE2346 PDX → SEA Jul 23, 07:00 UTCJul 23, 07:12 UTC12m
2026-07-23 QXE2309 GEG → SEA Jul 23, 03:33 UTCJul 23, 04:20 UTC47m
2026-07-23 QXE2309 GEG → SEA Jul 23, 03:35 UTCJul 23, 04:30 UTC55m
2026-07-23 QXE2293 PAE → SFO Jul 23, 01:45 UTCJul 23, 02:25 UTC40m
2026-07-23 QXE2293 PAE → SFO Jul 23, 01:44 UTCJul 23, 02:29 UTC45m
2026-07-22 QXE2286 PDX → SEA Jul 22, 23:40 UTCJul 23, 00:45 UTC1h 5m
2026-07-22 QXE2287 LAX → SFO Jul 22, 21:30 UTCJul 22, 22:50 UTC1h 20m
2026-07-22 QXE2013 PDX → BZN Jul 22, 19:40 UTCJul 22, 20:15 UTC35m
2026-07-22 QXE2004 SEA → YVR Jul 22, 17:30 UTCJul 22, 18:00 UTC30m
2026-07-22 QXE2420 PDX → SEA Jul 22, 14:30 UTCJul 22, 15:00 UTC30m
2026-07-22 QXE2043 PDX → SBP Jul 22, 12:43 UTCJul 22, 12:56 UTC13m
2026-07-22 QXE2043 PDX → SBP Jul 22, 12:30 UTCJul 22, 12:55 UTC25m
2026-07-22 QXE2057 SJC → PDX Jul 22, 05:10 UTCJul 22, 05:25 UTC15m
2026-07-22 QXE2057 SJC → PDX Jul 22, 05:08 UTCJul 22, 05:39 UTC31m
2026-07-22 QXE2127 SEA → OAK Jul 22, 00:45 UTCJul 22, 01:50 UTC1h 5m
2026-07-21 QXE2206 BOI → SEA Jul 21, 22:15 UTCJul 21, 23:30 UTC1h 15m
2026-07-21 QXE2003 SEA → OAK Jul 21, 19:50 UTCJul 21, 20:40 UTC50m
2026-07-21 QXE2225 - Jul 21, 18:00 UTCJul 21, 18:40 UTC40m
2026-07-21 QXE2225 PDX → YVR Jul 21, 17:55 UTCJul 21, 18:37 UTC42m

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 N639QX page for operator, model, and routing details .

Mode-S A8609F frequently asked

What is Mode-S code A8609F?
A8609F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N639QX.
Where is Mode-S A8609F registered?
Mode-S code A8609F 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 A8609F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8609F, octal 52060237, decimal 11,034,783.
What flights does A8609F operate?
Mode-S A8609F has broadcast 20 distinct callsigns, including QXE2400, QXE2286, QXE2113, QXE2347, QXE2076.