Apparatus

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sensors Mode-S transponder

A8A478

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N656QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A8A478
Octal
52122170
Decimal
11,052,152
Country
US
Tail
N656QX
Type
E75L
No current signal · last broadcast 1h ago
Flights observed
750
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A8A478.

Country allocation

The ICAO 24-bit address A8A478 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
QXE2347 - 9 2026-07-06
QXE2179 - 9 2026-06-26
QXE2175 - 9 2026-06-21
QXE2102 - 8 2026-06-25
QXE2079 - 8 2026-07-07
QXE2073 Horizon Air 8 2026-07-08
QXE2220 - 7 2026-07-09
QXE2158 - 7 2026-06-26
QXE2084 Horizon Air 7 2026-06-05
QXE2372 - 6 2026-07-13
QXE2283 Horizon Air 6 2026-06-03
QXE2076 - 6 2026-07-07
QXE2072 Horizon Air 6 2026-07-08
QXE2050 Horizon Air 6 2026-05-29
QXE2025 - 6 2026-07-03
QXE2457 - 5 2026-07-08
QXE2437 Horizon Air 5 2026-06-09
QXE2412 Horizon Air 5 2026-05-27
QXE2404 - 5 2026-07-11
QXE2336 Horizon Air 5 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QXE2191 - Jul 14, 21:30 UTCJul 15, 00:00 UTC2h 29m
2026-07-14 QXE2143 SBA → SEA Jul 14, 18:10 UTCJul 14, 20:00 UTC1h 50m
2026-07-14 QXE2142 SEA → SBA Jul 14, 15:13 UTCJul 14, 17:27 UTC2h 14m
2026-07-14 QXE2142 SEA → SBA Jul 14, 15:15 UTCJul 14, 17:25 UTC2h 10m
2026-07-14 QXE2067 PUW → SEA Jul 14, 12:50 UTCJul 14, 13:40 UTC50m
2026-07-14 QXE2364 - Jul 14, 06:20 UTCJul 14, 07:00 UTC40m
2026-07-14 QXE2364 SEA → PUW Jul 14, 06:22 UTCJul 14, 06:51 UTC29m
2026-07-14 QXE2352 - Jul 14, 04:10 UTCJul 14, 05:10 UTC1h 0m
2026-07-14 QXE2104 - Jul 14, 00:35 UTCJul 14, 01:30 UTC55m
2026-07-13 QXE2167 - Jul 13, 23:10 UTCJul 13, 23:40 UTC30m
2026-07-13 QXE2173 - Jul 13, 21:40 UTCJul 13, 22:10 UTC30m
2026-07-13 QXE2173 PDX → RDM Jul 13, 21:39 UTCJul 13, 22:07 UTC28m
2026-07-13 QXE2397 - Jul 13, 18:40 UTCJul 13, 20:25 UTC1h 45m
2026-07-13 QXE2301 - Jul 13, 05:05 UTCJul 13, 07:15 UTC2h 10m
2026-07-13 QXE2372 - Jul 13, 03:25 UTCJul 13, 03:45 UTC20m
2026-07-13 QXE2372 SEA → PDX Jul 13, 03:10 UTCJul 13, 03:45 UTC35m
2026-07-13 QXE2372 SEA → PDX Jul 13, 02:44 UTCJul 13, 03:10 UTC26m
2026-07-12 QXE2310 - Jul 12, 21:50 UTCJul 13, 01:20 UTC3h 30m
2026-07-12 QXE2013 YVR → SEA Jul 12, 19:01 UTCJul 12, 19:35 UTC35m
2026-07-12 QXE2004 SEA → YVR Jul 12, 17:10 UTCJul 12, 17:45 UTC35m
2026-07-12 QXE2004 SEA → YVR Jul 12, 17:07 UTCJul 12, 17:38 UTC31m
2026-07-12 QXE2012 - Jul 12, 15:10 UTCJul 12, 15:35 UTC25m
2026-07-12 QXE2228 PDX → YVR Jul 12, 05:01 UTCJul 12, 05:45 UTC45m
2026-07-12 QXE2228 PDX → YVR Jul 12, 05:04 UTCJul 12, 05:42 UTC38m
2026-07-12 QXE2372 SEA → PDX Jul 12, 02:35 UTCJul 12, 03:10 UTC35m
2026-07-11 QXE2286 RDD → SEA Jul 11, 22:30 UTCJul 11, 23:45 UTC1h 15m
2026-07-11 QXE2286 RDD → SEA Jul 11, 22:30 UTCJul 11, 23:34 UTC1h 4m
2026-07-11 QXE2287 SEA → RDD Jul 11, 20:15 UTCJul 11, 21:40 UTC1h 25m
2026-07-11 QXE2159 - Jul 11, 17:55 UTCJul 11, 19:05 UTC1h 10m
2026-07-11 QXE2031 GEG → BOI Jul 11, 16:00 UTCJul 11, 16:50 UTC50m
2026-07-11 QXE2404 - Jul 11, 14:25 UTCJul 11, 15:10 UTC45m
2026-07-11 QXE2404 PDX → GEG Jul 11, 14:19 UTCJul 11, 14:59 UTC40m
2026-07-11 QXE2053 EUG → PDX Jul 11, 12:30 UTCJul 11, 12:55 UTC25m
2026-07-11 QXE2047 - Jul 11, 06:01 UTCJul 11, 06:50 UTC50m
2026-07-11 QXE2313 PDX → SEA Jul 11, 02:50 UTCJul 11, 03:15 UTC25m
2026-07-11 QXE2302 - Jul 11, 01:10 UTCJul 11, 01:50 UTC40m
2026-07-10 QXE2359 - Jul 10, 21:55 UTCJul 10, 22:20 UTC25m
2026-07-10 QXE2149 - Jul 10, 20:15 UTCJul 10, 20:40 UTC25m
2026-07-10 QXE2159 BOI → SEA Jul 10, 17:55 UTCJul 10, 19:00 UTC1h 5m
2026-07-10 QXE2031 MFR → SEA Jul 10, 15:55 UTCJul 10, 16:45 UTC50m
2026-07-10 QXE2404 - Jul 10, 14:15 UTCJul 10, 15:05 UTC50m
2026-07-10 QXE2056 SEA → SJC Jul 10, 00:30 UTCJul 10, 02:10 UTC1h 40m
2026-07-09 QXE2056 SEA → SJC Jul 9, 21:40 UTCJul 9, 23:20 UTC1h 40m
2026-07-09 QXE2181 SEA → PDX Jul 9, 19:35 UTCJul 9, 20:05 UTC30m
2026-07-09 QXE2181 SEA → PDX Jul 9, 19:35 UTCJul 9, 20:03 UTC28m
2026-07-09 QXE2141 AUS → SJC Jul 9, 14:30 UTCJul 9, 18:20 UTC3h 50m
2026-07-09 QXE2220 - Jul 9, 00:55 UTCJul 9, 04:35 UTC3h 40m
2026-07-08 QXE2217 SEA → TUL Jul 8, 20:45 UTCJul 8, 23:55 UTC3h 10m
2026-07-08 QXE2073 SFO → LAX Jul 8, 17:50 UTCJul 8, 18:35 UTC45m
2026-07-08 QXE2073 SFO → LAX Jul 8, 17:55 UTCJul 8, 18:30 UTC35m

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 N656QX page for operator, model, and routing details .

Mode-S A8A478 frequently asked

What is Mode-S code A8A478?
A8A478 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N656QX.
Where is Mode-S A8A478 registered?
Mode-S code A8A478 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 A8A478 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 A8A478, octal 52122170, decimal 11,052,152.
What flights does A8A478 operate?
Mode-S A8A478 has broadcast 20 distinct callsigns, including QXE2347, QXE2179, QXE2175, QXE2102, QXE2079.