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 Jul 26, 20:50 UTC
Flights observed
846
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

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
QXE2073 Horizon Air 14 2026-07-26
QXE2226 Horizon Air 10 2026-07-26
QXE2130 Horizon Air 10 2026-07-26
QXE2102 Horizon Air 10 2026-07-23
QXE2347 - 9 2026-07-06
QXE2179 - 9 2026-06-26
QXE2175 - 9 2026-06-21
QXE2158 Horizon Air 9 2026-07-22
QXE2277 Horizon Air 8 2026-07-26
QXE2079 - 8 2026-07-07
QXE2220 - 7 2026-07-09
QXE2084 Horizon Air 7 2026-06-05
QXE2074 Horizon Air 7 2026-07-26
QXE2060 Horizon Air 7 2026-07-26
QXE2039 Horizon Air 7 2026-07-25
QXE2372 - 6 2026-07-13
QXE2283 Horizon Air 6 2026-06-03
QXE2103 Horizon Air 6 2026-07-23
QXE2076 - 6 2026-07-07
QXE2072 Horizon Air 6 2026-07-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2038 PHX → SFO Jul 26, 20:05 UTCJul 26, 20:50 UTC45m
2026-07-26 QXE2074 PDX → SFO Jul 26, 17:45 UTCJul 26, 18:55 UTC1h 10m
2026-07-26 QXE2073 SFO → LAX Jul 26, 15:30 UTCJul 26, 16:25 UTC55m
2026-07-26 QXE2060 OAK → SEA Jul 26, 13:10 UTCJul 26, 13:55 UTC45m
2026-07-26 QXE2060 OAK → SEA Jul 26, 13:12 UTCJul 26, 13:55 UTC43m
2026-07-26 QXE2277 PDX → MCI Jul 26, 07:05 UTCJul 26, 07:50 UTC45m
2026-07-26 QXE2130 LAX → SEA Jul 26, 02:45 UTCJul 26, 04:00 UTC1h 15m
2026-07-26 QXE2226 SMF → SEA Jul 26, 00:15 UTCJul 26, 01:30 UTC1h 15m
2026-07-26 QXE2226 SMF → SEA Jul 26, 00:10 UTCJul 26, 01:28 UTC1h 18m
2026-07-25 QXE2039 PHX → SFO Jul 25, 22:00 UTCJul 25, 22:45 UTC45m
2026-07-25 QXE2039 PHX → SFO Jul 25, 21:54 UTCJul 25, 22:49 UTC55m
2026-07-25 QXE2038 PHX → SFO Jul 25, 20:10 UTCJul 25, 21:05 UTC55m
2026-07-25 QXE2074 PDX → SFO Jul 25, 18:05 UTCJul 25, 19:15 UTC1h 10m
2026-07-25 QXE2073 SFO → LAX Jul 25, 15:35 UTCJul 25, 16:35 UTC1h 0m
2026-07-25 QXE2060 OAK → SEA Jul 25, 13:20 UTCJul 25, 14:00 UTC40m
2026-07-25 QXE2277 PDX → MCI Jul 25, 07:20 UTCJul 25, 08:05 UTC45m
2026-07-25 QXE2130 LAX → SEA Jul 25, 02:40 UTCJul 25, 03:55 UTC1h 15m
2026-07-25 QXE2130 LAX → SEA Jul 25, 02:45 UTCJul 25, 04:01 UTC1h 16m
2026-07-25 QXE2226 SMF → SEA Jul 25, 00:15 UTCJul 25, 01:40 UTC1h 25m
2026-07-24 QXE2134 PSP → PAE Jul 24, 22:20 UTCJul 24, 23:10 UTC50m
2026-07-24 QXE2134 PSP → PAE Jul 24, 22:19 UTCJul 24, 23:06 UTC47m
2026-07-24 QXE2090 PDX → SEA Jul 24, 20:35 UTCJul 24, 21:20 UTC45m
2026-07-24 QXE2074 PDX → SFO Jul 24, 18:00 UTCJul 24, 19:10 UTC1h 10m
2026-07-24 QXE2073 SFO → LAX Jul 24, 15:35 UTCJul 24, 16:30 UTC55m
2026-07-24 QXE2130 LAX → SEA Jul 24, 02:35 UTCJul 24, 03:45 UTC1h 10m
2026-07-24 QXE2226 SMF → SEA Jul 24, 00:10 UTCJul 24, 01:35 UTC1h 25m
2026-07-23 QXE2134 PSP → PAE Jul 23, 22:25 UTCJul 23, 23:10 UTC45m
2026-07-23 QXE2090 PDX → SEA Jul 23, 20:50 UTCJul 23, 21:35 UTC45m
2026-07-23 QXE2074 PDX → SFO Jul 23, 18:05 UTCJul 23, 19:10 UTC1h 5m
2026-07-23 QXE2074 PDX → SFO Jul 23, 17:55 UTCJul 23, 19:10 UTC1h 15m
2026-07-23 QXE2073 - Jul 23, 15:40 UTCJul 23, 16:35 UTC55m
2026-07-23 QXE2060 - Jul 23, 13:10 UTCJul 23, 14:05 UTC55m
2026-07-23 QXE2277 ANC → FAI Jul 23, 07:10 UTCJul 23, 07:55 UTC45m
2026-07-23 QXE2099 SJC → PDX Jul 23, 05:35 UTCJul 23, 06:20 UTC45m
2026-07-23 QXE2085 BIL → SEA Jul 23, 04:00 UTCJul 23, 04:45 UTC45m
2026-07-23 QXE2102 SEA → OAK Jul 23, 02:15 UTCJul 23, 03:00 UTC45m
2026-07-23 QXE2103 RDM → SEA Jul 23, 00:39 UTCJul 23, 01:22 UTC43m
2026-07-23 QXE2103 RDM → SEA Jul 23, 00:40 UTCJul 23, 01:30 UTC50m
2026-07-22 QXE2160 SEA → MSO Jul 22, 21:40 UTCJul 22, 22:40 UTC1h 0m
2026-07-22 QXE2158 SNA → PDX Jul 22, 19:35 UTCJul 22, 20:30 UTC55m
2026-07-22 QXE2033 SJC → SEA Jul 22, 17:40 UTCJul 22, 18:35 UTC55m
2026-07-22 QXE2032 - Jul 22, 15:30 UTCJul 22, 16:20 UTC50m
2026-07-22 QXE2192 PDX → ANC Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-22 QXE2331 SEA → FCA Jul 22, 02:25 UTCJul 22, 03:35 UTC1h 10m
2026-07-22 QXE2258 SEA → PDX Jul 22, 00:15 UTCJul 22, 01:25 UTC1h 10m
2026-07-22 QXE2258 SEA → PDX Jul 22, 00:17 UTCJul 22, 01:25 UTC1h 8m
2026-07-21 QXE2169 ANC → BET Jul 21, 20:50 UTCJul 21, 23:10 UTC2h 20m
2026-07-21 QXE2146 - Jul 21, 18:25 UTCJul 21, 19:20 UTC55m
2026-07-21 QXE2398 SMF → SAN Jul 21, 13:05 UTCJul 21, 16:45 UTC3h 40m
2026-07-21 QXE2099 SJC → PDX Jul 21, 04:45 UTCJul 21, 05:35 UTC50m

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 Jul 26, 20:50 UTC.
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 QXE2073, QXE2226, QXE2130, QXE2102, QXE2347.