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 1h ago
Flights observed
717
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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 - 11 2026-07-13
QXE2113 - 10 2026-07-09
QXE2286 - 9 2026-06-26
QXE2076 - 8 2026-07-13
QXE2347 - 7 2026-06-30
QXE2329 - 7 2026-07-09
QXE2275 - 7 2026-06-30
QXE2443 Horizon Air 6 2026-05-10
QXE2430 Horizon Air 6 2026-05-09
QXE2399 Horizon Air 6 2026-06-23
QXE2328 Horizon Air 6 2026-06-02
QXE2306 Horizon Air 6 2026-06-28
QXE2276 - 6 2026-07-12
QXE2271 - 6 2026-07-12
QXE2178 - 6 2026-06-21
QXE2155 - 6 2026-06-30
QXE2117 - 6 2026-07-04
QXE2006 - 6 2026-06-15
QXE2001 - 6 2026-06-25
QXE2346 - 5 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QXE2365 - Jul 14, 19:35 UTCJul 14, 19:45 UTC10m
2026-07-14 QXE2126 - Jul 14, 18:05 UTCJul 14, 18:35 UTC30m
2026-07-14 QXE2095 SMF → PDX Jul 14, 15:25 UTCJul 14, 16:30 UTC1h 5m
2026-07-14 QXE2095 SMF → PDX Jul 14, 15:22 UTCJul 14, 16:27 UTC1h 5m
2026-07-14 QXE2156 - Jul 14, 13:15 UTCJul 14, 14:25 UTC1h 10m
2026-07-14 QXE2034 - Jul 14, 03:30 UTCJul 14, 04:35 UTC1h 5m
2026-07-14 QXE2339 EUG → SEA Jul 14, 01:02 UTCJul 14, 01:29 UTC27m
2026-07-14 QXE2339 EUG → SEA Jul 14, 00:50 UTCJul 14, 01:30 UTC40m
2026-07-13 QXE2338 - Jul 13, 23:05 UTCJul 13, 23:50 UTC45m
2026-07-13 QXE2400 - Jul 13, 21:25 UTCJul 13, 22:05 UTC40m
2026-07-13 QXE2400 RDM → SEA Jul 13, 21:22 UTCJul 13, 21:56 UTC34m
2026-07-13 QXE2400 - Jul 13, 19:45 UTCJul 13, 20:30 UTC45m
2026-07-13 QXE2076 RDM → SEA Jul 13, 17:00 UTCJul 13, 17:45 UTC45m
2026-07-13 QXE2076 RDM → SEA Jul 13, 17:00 UTCJul 13, 17:41 UTC41m
2026-07-13 QXE2079 - Jul 13, 15:10 UTCJul 13, 15:55 UTC45m
2026-07-13 QXE2122 - Jul 13, 12:50 UTCJul 13, 14:00 UTC1h 10m
2026-07-13 QXE2121 SEA → FCA Jul 13, 05:26 UTCJul 13, 06:17 UTC51m
2026-07-13 QXE2121 - Jul 13, 05:25 UTCJul 13, 06:15 UTC50m
2026-07-13 QXE2017 YVR → SEA Jul 13, 03:33 UTCJul 13, 03:55 UTC22m
2026-07-13 QXE2017 - Jul 13, 03:10 UTCJul 13, 03:15 UTC5m
2026-07-13 QXE2008 - Jul 13, 01:20 UTCJul 13, 01:50 UTC30m
2026-07-12 QXE2097 - Jul 12, 23:30 UTCJul 13, 00:10 UTC40m
2026-07-12 QXE2097 ALW → SEA Jul 12, 23:30 UTCJul 13, 00:03 UTC33m
2026-07-12 QXE2115 - Jul 12, 21:55 UTCJul 12, 22:30 UTC35m
2026-07-12 QXE2276 - Jul 12, 18:10 UTCJul 12, 20:01 UTC1h 50m
2026-07-12 QXE2271 - Jul 12, 15:35 UTCJul 12, 15:45 UTC10m
2026-07-12 QXE2271 SEA → YEG Jul 12, 15:37 UTCJul 12, 16:45 UTC1h 8m
2026-07-12 QXE2046 EUG → SEA Jul 12, 13:15 UTCJul 12, 13:55 UTC40m
2026-07-12 QXE2047 SEA → EUG Jul 12, 06:10 UTCJul 12, 06:55 UTC45m
2026-07-11 QXE2191 SEA → SEA Jul 11, 21:30 UTCJul 12, 05:01 UTC7h 30m
2026-07-11 QXE2143 OAK → PDX Jul 11, 18:10 UTCJul 11, 20:10 UTC2h 0m
2026-07-11 QXE2142 - Jul 11, 15:05 UTCJul 11, 17:15 UTC2h 10m
2026-07-11 QXE2142 SEA → SBA Jul 11, 15:02 UTCJul 11, 17:20 UTC2h 18m
2026-07-11 QXE2067 PUW → SEA Jul 11, 13:00 UTCJul 11, 13:50 UTC50m
2026-07-11 QXE2364 - Jul 11, 05:55 UTCJul 11, 06:35 UTC40m
2026-07-11 QXE2128 - Jul 11, 01:40 UTCJul 11, 03:20 UTC1h 40m
2026-07-10 QXE2129 - Jul 10, 22:40 UTCJul 11, 00:35 UTC1h 55m
2026-07-10 QXE2014 YVR → SEA Jul 10, 20:55 UTCJul 10, 21:30 UTC35m
2026-07-10 QXE2005 SEA → YVR Jul 10, 19:00 UTCJul 10, 19:35 UTC35m
2026-07-10 QXE2070 SAN → SFO Jul 10, 14:25 UTCJul 10, 15:35 UTC1h 10m
2026-07-10 QXE2201 LAX → LAS Jul 10, 03:05 UTCJul 10, 04:40 UTC1h 35m
2026-07-10 QXE2201 LAX → LAS Jul 10, 03:01 UTCJul 10, 04:45 UTC1h 44m
2026-07-09 QXE2329 - Jul 9, 23:55 UTCJul 10, 01:25 UTC1h 30m
2026-07-09 QXE2329 MFR → LAX Jul 9, 23:52 UTCJul 10, 01:16 UTC1h 24m
2026-07-09 QXE2125 PDX → MFR Jul 9, 22:20 UTCJul 9, 23:00 UTC40m
2026-07-09 QXE2042 - Jul 9, 20:30 UTCJul 9, 21:25 UTC55m
2026-07-09 QXE2168 - Jul 9, 16:55 UTCJul 9, 19:10 UTC2h 15m
2026-07-09 QXE2174 PDX → SFO Jul 9, 13:16 UTCJul 9, 13:37 UTC21m
2026-07-09 QXE2174 PDX → SFO Jul 9, 13:00 UTCJul 9, 13:35 UTC35m
2026-07-09 QXE2175 - Jul 9, 06:05 UTCJul 9, 06:45 UTC40m

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 1h ago.
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, QXE2113, QXE2286, QXE2076, QXE2347.