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 4h ago
Flights observed
352
Distinct callsigns
20
Country
US
Last broadcast
4h 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
QXE2286 Horizon Air 7 2026-05-09
QXE2443 Horizon Air 6 2026-05-10
QXE2430 Horizon Air 6 2026-05-09
QXE2347 Horizon Air 5 2026-05-09
QXE2148 Horizon Air 5 2026-05-29
QXE2352 Horizon Air 4 2026-05-10
QXE2329 Horizon Air 4 2026-05-19
QXE2328 Horizon Air 4 2026-05-19
QXE2308 Horizon Air 4 2026-05-25
QXE2282 - 4 2026-04-14
QXE2264 Horizon Air 4 2026-05-21
QXE2257 Horizon Air 4 2026-05-03
QXE2178 Horizon Air 4 2026-05-15
QXE2177 Horizon Air 4 2026-05-14
QXE2138 Horizon Air 4 2026-05-12
QXE2117 Horizon Air 4 2026-05-16
QXE2113 Horizon Air 4 2026-05-12
QXE2101 Horizon Air 4 2026-05-24
QXE2091 Horizon Air 4 2026-05-26
QXE2045 Horizon Air 4 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 QXE2422 GEG → PDX May 30, 03:27 UTCMay 30, 05:31 UTC2h 4m
2026-05-30 QXE2422 GEG → PDX May 30, 03:30 UTCMay 30, 05:35 UTC2h 5m
2026-05-30 QXE2415 SFO → PSP May 30, 01:10 UTCMay 30, 02:20 UTC1h 10m
2026-05-29 QXE2434 PDX → MSP May 29, 22:05 UTCMay 30, 00:05 UTC2h 0m
2026-05-29 QXE2298 SLC → SAN May 29, 20:15 UTCMay 29, 21:00 UTC45m
2026-05-29 QXE2148 LAX → SFO May 29, 18:00 UTCMay 29, 19:20 UTC1h 20m
2026-05-29 QXE2148 LAX → SFO May 29, 16:00 UTCMay 29, 16:50 UTC50m
2026-05-29 QXE2457 BIL → SEA May 29, 12:45 UTCMay 29, 13:45 UTC1h 0m
2026-05-29 QXE2457 BIL → SEA May 29, 12:10 UTCMay 29, 13:39 UTC1h 29m
2026-05-29 QXE2367 SEA → PSC May 29, 03:55 UTCMay 29, 04:55 UTC1h 0m
2026-05-29 QXE2226 SMF → SEA May 29, 01:05 UTCMay 29, 02:25 UTC1h 20m
2026-05-29 QXE2226 SMF → SEA May 29, 01:03 UTCMay 29, 02:16 UTC1h 13m
2026-05-28 QXE2226 SMF → SEA May 28, 22:50 UTCMay 29, 00:00 UTC1h 10m
2026-05-28 QXE2372 LAX → SFO May 28, 18:15 UTCMay 28, 21:45 UTC3h 30m
2026-05-28 QXE2002 PSP → SFO May 28, 16:10 UTCMay 28, 17:00 UTC50m
2026-05-28 QXE2008 SFO → LAX May 28, 05:00 UTCMay 28, 05:45 UTC45m
2026-05-28 QXE2225 SJC → BOI May 28, 02:15 UTCMay 28, 03:00 UTC45m
2026-05-28 QXE2225 SJC → BOI May 28, 02:11 UTCMay 28, 02:50 UTC39m
2026-05-28 QXE2225 SJC → BOI May 28, 00:45 UTCMay 28, 01:25 UTC40m
2026-05-27 QXE2394 SEA → PSC May 27, 22:45 UTCMay 27, 23:45 UTC1h 0m
2026-05-27 QXE2327 SJC → SEA May 27, 20:55 UTCMay 27, 21:40 UTC45m
2026-05-27 QXE2325 PDX → SFO May 27, 18:50 UTCMay 27, 19:55 UTC1h 5m
2026-05-27 QXE2405 SJC → PDX May 27, 17:00 UTCMay 27, 17:35 UTC35m
2026-05-27 QXE2180 SAN → SFO May 27, 14:40 UTCMay 27, 15:40 UTC1h 0m
2026-05-27 QXE2413 BUR → SFO May 27, 04:34 UTCMay 27, 05:35 UTC1h 0m
2026-05-27 QXE2203 SMF → SEA May 27, 00:25 UTCMay 27, 01:49 UTC1h 25m
2026-05-26 QXE2441 SJC → SEA May 26, 22:05 UTCMay 26, 23:25 UTC1h 20m
2026-05-26 QXE2354 SFO → PSP May 26, 20:30 UTCMay 26, 20:57 UTC27m
2026-05-26 QXE2186 YYC → SEA May 26, 17:20 UTCMay 26, 19:10 UTC1h 50m
2026-05-26 QXE2186 YYC → SEA May 26, 14:30 UTCMay 26, 16:10 UTC1h 40m
2026-05-26 QXE2091 MFR → LAX May 26, 12:40 UTCMay 26, 13:00 UTC20m
2026-05-26 QXE2091 MFR → LAX May 26, 12:29 UTCMay 26, 12:55 UTC26m
2026-05-26 QXE2456 SEA → SFO May 26, 06:49 UTCMay 26, 07:05 UTC15m
2026-05-26 QXE2408 ANC → FAI May 26, 03:55 UTCMay 26, 05:54 UTC2h 0m
2026-05-26 QXE2408 ANC → FAI May 26, 01:00 UTCMay 26, 03:00 UTC2h 0m
2026-05-25 QXE2275 SJC → PDX May 25, 23:14 UTCMay 25, 23:49 UTC35m
2026-05-25 QXE2155 SAN → PAE May 25, 20:24 UTCMay 25, 20:40 UTC15m
2026-05-25 QXE2308 SJC → PDX May 25, 17:50 UTCMay 25, 19:15 UTC1h 25m
2026-05-25 QXE2308 SJC → PDX May 25, 15:15 UTCMay 25, 16:20 UTC1h 5m
2026-05-25 QXE2171 PDX → OAK May 25, 13:20 UTCMay 25, 13:45 UTC25m
2026-05-25 QXE2172 SEA → YKM May 25, 06:45 UTCMay 25, 07:00 UTC15m
2026-05-25 QXE2142 SEA → EUG May 25, 03:40 UTCMay 25, 05:10 UTC1h 30m
2026-05-25 QXE2142 SEA → EUG May 25, 01:55 UTCMay 25, 02:30 UTC35m
2026-05-24 QXE2006 OAK → PDX May 24, 20:55 UTCMay 24, 21:30 UTC35m
2026-05-24 QXE2006 OAK → PDX May 24, 20:51 UTCMay 24, 21:24 UTC33m
2026-05-24 QXE2217 LAX → SFO May 24, 18:05 UTCMay 24, 19:25 UTC1h 20m
2026-05-24 QXE2217 LAX → SFO May 24, 15:20 UTCMay 24, 16:40 UTC1h 20m
2026-05-24 QXE2101 LAX → SFO May 24, 13:05 UTCMay 24, 13:40 UTC35m
2026-05-24 QXE2100 SEA → PSC May 24, 07:10 UTCMay 24, 07:35 UTC25m
2026-05-24 QXE2237 PDX → SFO May 24, 01:55 UTCMay 24, 05:30 UTC3h 35m

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 4h 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 QXE2286, QXE2443, QXE2430, QXE2347, QXE2148.