Apparatus

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sensors Mode-S transponder

A8B964

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N661QX · operated by HORIZON AIR INDUSTRIES INC

Hex
A8B964
Octal
52134544
Decimal
11,057,508
Country
US
Tail
N661QX
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
683
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A8B964.

Country allocation

The ICAO 24-bit address A8B964 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
QXE2333 Horizon Air 8 2026-07-25
QXE2113 Horizon Air 8 2026-07-26
QXE9986 Horizon Air 6 2026-05-27
QXE2452 - 6 2026-07-19
QXE2407 Horizon Air 6 2026-07-23
QXE2251 - 6 2026-07-16
QXE2161 - 6 2026-06-23
QXE2117 - 6 2026-06-20
QXE2030 Horizon Air 6 2026-07-23
QXE2018 Horizon Air 6 2026-07-02
QXE2003 Horizon Air 6 2026-04-18
QXE2445 Horizon Air 5 2026-04-29
QXE2408 Horizon Air 5 2026-06-08
QXE2275 - 5 2026-07-19
QXE2264 - 5 2026-07-17
QXE2167 Horizon Air 5 2026-07-23
QXE2155 - 5 2026-07-19
QXE2142 Horizon Air 5 2026-06-07
QXE2137 - 5 2026-07-10
QXE2100 Horizon Air 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2056 SEA → SJC Jul 26, 22:05 UTCJul 26, 23:00 UTC55m
2026-07-26 QXE2283 PSP → SFO Jul 26, 19:25 UTCJul 26, 20:35 UTC1h 10m
2026-07-26 QXE2186 YYC → SEA Jul 26, 15:40 UTCJul 26, 17:45 UTC2h 5m
2026-07-26 QXE2267 SEA → OAK Jul 26, 13:10 UTCJul 26, 14:00 UTC50m
2026-07-26 QXE2312 SJC → PDX Jul 26, 06:00 UTCJul 26, 06:40 UTC41m
2026-07-26 QXE2213 PAE → SFO Jul 26, 03:30 UTCJul 26, 04:40 UTC1h 10m
2026-07-26 QXE2113 SFO → PDX Jul 26, 00:45 UTCJul 26, 02:25 UTC1h 40m
2026-07-26 QXE2113 SFO → PDX Jul 26, 00:44 UTCJul 26, 02:19 UTC1h 35m
2026-07-25 QXE2077 SJC → PDX Jul 25, 23:05 UTCJul 25, 23:30 UTC25m
2026-07-25 QXE2077 SJC → PDX Jul 25, 23:02 UTCJul 25, 23:37 UTC35m
2026-07-25 QXE2078 PAE → SFO Jul 25, 21:45 UTCJul 25, 22:10 UTC25m
2026-07-25 QXE2333 SFO → SAN Jul 25, 17:35 UTCJul 25, 19:05 UTC1h 30m
2026-07-25 QXE2333 SFO → SAN Jul 25, 15:05 UTCJul 25, 16:35 UTC1h 30m
2026-07-25 QXE2333 SFO → SAN Jul 25, 15:01 UTCJul 25, 16:26 UTC1h 25m
2026-07-25 QXE2331 SEA → FCA Jul 25, 02:15 UTCJul 25, 03:15 UTC1h 0m
2026-07-25 QXE2331 SEA → FCA Jul 25, 02:10 UTCJul 25, 03:17 UTC1h 7m
2026-07-24 QXE2258 SEA → PDX Jul 24, 23:50 UTCJul 25, 01:05 UTC1h 15m
2026-07-24 QXE2101 LAX → SFO Jul 24, 19:20 UTCJul 24, 20:35 UTC1h 15m
2026-07-24 QXE2100 SEA → PSC Jul 24, 17:00 UTCJul 24, 18:10 UTC1h 10m
2026-07-24 QXE2229 PDX → SFO Jul 24, 04:00 UTCJul 24, 05:25 UTC1h 25m
2026-07-24 QXE2082 OAK → SEA Jul 24, 00:50 UTCJul 24, 02:20 UTC1h 30m
2026-07-23 QXE2167 LAX → SJC Jul 23, 23:25 UTCJul 23, 23:55 UTC30m
2026-07-23 QXE2173 SFO → PDX Jul 23, 21:40 UTCJul 23, 22:10 UTC30m
2026-07-23 QXE2365 LAX → SFO Jul 23, 19:45 UTCJul 23, 20:25 UTC40m
2026-07-23 QXE2126 SJC → SEA Jul 23, 18:10 UTCJul 23, 18:50 UTC40m
2026-07-23 QXE2397 SBA → SEA Jul 23, 14:10 UTCJul 23, 16:00 UTC1h 50m
2026-07-23 QXE2396 SFO → PAE Jul 23, 06:30 UTCJul 23, 08:25 UTC1h 55m
2026-07-23 QXE2396 SFO → PAE Jul 23, 06:25 UTCJul 23, 08:23 UTC1h 58m
2026-07-23 QXE2407 PSP → SFO Jul 23, 03:20 UTCJul 23, 04:15 UTC55m
2026-07-23 QXE2030 GEG → SFO Jul 23, 01:40 UTCJul 23, 02:25 UTC45m
2026-07-22 QXE2061 SBP → SEA Jul 22, 23:40 UTCJul 23, 00:40 UTC1h 0m
2026-07-22 QXE2055 GEG → SFO Jul 22, 19:55 UTCJul 22, 21:35 UTC1h 40m
2026-07-22 QXE2054 OAK → PDX Jul 22, 17:20 UTCJul 22, 18:20 UTC1h 0m
2026-07-22 QXE2012 RDM → SFO Jul 22, 15:25 UTCJul 22, 15:55 UTC30m
2026-07-22 QXE2228 PAE → SFO Jul 22, 04:55 UTCJul 22, 05:25 UTC30m
2026-07-22 QXE2304 YVR → SEA Jul 22, 00:51 UTCJul 22, 01:52 UTC1h 1m
2026-07-22 QXE2304 YVR → SEA Jul 22, 00:40 UTCJul 22, 01:55 UTC1h 15m
2026-07-21 QXE2035 LAX → PDX Jul 21, 22:15 UTCJul 21, 23:45 UTC1h 30m
2026-07-21 QXE2333 SFO → SAN Jul 21, 19:50 UTCJul 21, 21:20 UTC1h 30m
2026-07-21 QXE2333 SFO → SAN Jul 21, 19:48 UTCJul 21, 21:15 UTC1h 27m
2026-07-21 QXE2333 SFO → SAN Jul 21, 17:25 UTCJul 21, 18:55 UTC1h 30m
2026-07-21 QXE2218 MSO → SEA Jul 21, 02:55 UTCJul 21, 03:20 UTC25m
2026-07-21 QXE2172 SEA → YKM Jul 21, 01:25 UTCJul 21, 01:50 UTC25m
2026-07-20 QXE2471 - Jul 20, 23:10 UTCJul 20, 23:45 UTC35m
2026-07-20 QXE2475 RDM → SEA Jul 20, 21:50 UTCJul 20, 22:20 UTC30m
2026-07-20 QXE2181 SEA → GEG Jul 20, 19:40 UTCJul 20, 20:15 UTC35m
2026-07-20 QXE2141 AUS → SJC Jul 20, 14:20 UTCJul 20, 18:25 UTC4h 5m
2026-07-20 QXE2300 PDX → ONT Jul 20, 12:25 UTCJul 20, 13:00 UTC35m
2026-07-20 QXE2245 - Jul 20, 06:10 UTCJul 20, 06:45 UTC35m
2026-07-20 QXE2327 SJC → SEA Jul 20, 02:40 UTCJul 20, 03:55 UTC1h 15m

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 N661QX page for operator, model, and routing details .

Mode-S A8B964 frequently asked

What is Mode-S code A8B964?
A8B964 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N661QX.
Where is Mode-S A8B964 registered?
Mode-S code A8B964 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 A8B964 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B964, octal 52134544, decimal 11,057,508.
What flights does A8B964 operate?
Mode-S A8B964 has broadcast 20 distinct callsigns, including QXE2333, QXE2113, QXE9986, QXE2452, QXE2407.