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 57m ago
Flights observed
610
Distinct callsigns
20
Country
US
Last broadcast
57m ago

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
QXE9986 Horizon Air 6 2026-05-27
QXE2251 - 6 2026-07-16
QXE2161 - 6 2026-06-23
QXE2117 - 6 2026-06-20
QXE2113 - 6 2026-07-04
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
QXE2407 - 5 2026-07-18
QXE2264 - 5 2026-07-17
QXE2142 Horizon Air 5 2026-06-07
QXE2137 - 5 2026-07-10
QXE2089 - 5 2026-07-02
QXE2074 - 5 2026-06-21
QXE2057 Horizon Air 5 2026-06-13
QXE2024 Horizon Air 5 2026-07-01
QXE2456 - 4 2026-07-07
QXE2452 - 4 2026-06-20
QXE2415 - 4 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 QXE2407 - Jul 18, 02:45 UTCJul 18, 03:00 UTC16m
2026-07-18 QXE2030 - Jul 18, 01:05 UTCJul 18, 01:54 UTC50m
2026-07-17 QXE2264 - Jul 17, 23:30 UTCJul 18, 00:19 UTC50m
2026-07-17 QXE2264 GEG → BOI Jul 17, 23:30 UTCJul 18, 00:24 UTC54m
2026-07-17 QXE2180 SEA → GEG Jul 17, 22:00 UTCJul 17, 22:40 UTC40m
2026-07-17 QXE2231 BOI → SEA Jul 17, 19:20 UTCJul 17, 20:29 UTC1h 10m
2026-07-17 QXE2231 BOI → SEA Jul 17, 19:19 UTCJul 17, 20:17 UTC58m
2026-07-17 QXE2230 - Jul 17, 17:15 UTCJul 17, 18:19 UTC1h 5m
2026-07-17 QXE2012 YVR → SEA Jul 17, 15:25 UTCJul 17, 15:55 UTC30m
2026-07-17 QXE2228 PDX → YVR Jul 17, 05:45 UTCJul 17, 06:35 UTC50m
2026-07-17 QXE2107 PAE → SFO Jul 17, 02:34 UTCJul 17, 03:10 UTC35m
2026-07-17 QXE2163 PDX → MFR Jul 17, 00:55 UTCJul 17, 01:39 UTC45m
2026-07-16 QXE2297 - Jul 16, 22:35 UTCJul 16, 23:40 UTC1h 5m
2026-07-16 QXE2368 - Jul 16, 19:30 UTCJul 16, 20:25 UTC55m
2026-07-16 QXE2368 PDX → BIL Jul 16, 19:29 UTCJul 16, 21:01 UTC1h 32m
2026-07-16 QXE2256 SJC → PDX Jul 16, 16:55 UTCJul 16, 18:19 UTC1h 25m
2026-07-16 QXE2080 PDX → SJC Jul 16, 14:35 UTCJul 16, 16:05 UTC1h 30m
2026-07-16 QXE2043 - Jul 16, 12:34 UTCJul 16, 13:10 UTC35m
2026-07-16 QXE2223 SAN → RDM Jul 16, 05:45 UTCJul 16, 07:30 UTC1h 45m
2026-07-16 QXE2223 SAN → RDM Jul 16, 05:43 UTCJul 16, 07:32 UTC1h 49m
2026-07-16 QXE2251 LAS → SAN Jul 16, 03:40 UTCJul 16, 04:30 UTC50m
2026-07-16 QXE2092 - Jul 16, 00:40 UTCJul 16, 01:30 UTC50m
2026-07-15 QXE2415 - Jul 15, 21:50 UTCJul 15, 23:35 UTC1h 45m
2026-07-15 QXE2415 - Jul 15, 21:25 UTCJul 15, 21:45 UTC20m
2026-07-15 QXE2086 SAN → RDM Jul 15, 17:35 UTCJul 15, 19:20 UTC1h 45m
2026-07-15 QXE2290 - Jul 15, 15:05 UTCJul 15, 16:25 UTC1h 20m
2026-07-15 QXE2289 - Jul 15, 05:00 UTCJul 15, 06:05 UTC1h 5m
2026-07-15 QXE2251 LAS → SAN Jul 15, 02:57 UTCJul 15, 03:30 UTC33m
2026-07-15 QXE2251 LAS → SAN Jul 15, 02:50 UTCJul 15, 03:45 UTC55m
2026-07-14 QXE2092 - Jul 14, 23:25 UTCJul 15, 00:15 UTC50m
2026-07-14 QXE2176 - Jul 14, 20:50 UTCJul 14, 21:30 UTC40m
2026-07-14 QXE2317 PDX → SBA Jul 14, 18:00 UTCJul 14, 20:00 UTC2h 0m
2026-07-14 QXE2298 OAK → PDX Jul 14, 15:00 UTCJul 14, 16:10 UTC1h 10m
2026-07-14 QXE2036 - Jul 14, 06:55 UTCJul 14, 08:25 UTC1h 30m
2026-07-14 QXE2036 PDX → OAK Jul 14, 06:52 UTCJul 14, 08:30 UTC1h 38m
2026-07-13 QXE2318 SBA → PDX Jul 13, 21:50 UTCJul 13, 23:30 UTC1h 40m
2026-07-13 QXE2177 SAN → SBA Jul 13, 20:21 UTCJul 13, 20:31 UTC10m
2026-07-13 QXE2177 - Jul 13, 20:00 UTCJul 13, 20:05 UTC5m
2026-07-13 QXE2101 SMF → SAN Jul 13, 17:50 UTCJul 13, 19:10 UTC1h 20m
2026-07-13 QXE2100 - Jul 13, 14:55 UTCJul 13, 16:05 UTC1h 10m
2026-07-13 QXE2174 SBA → SAN Jul 13, 13:05 UTCJul 13, 13:45 UTC40m
2026-07-13 QXE2029 - Jul 13, 01:05 UTCJul 13, 03:05 UTC2h 0m
2026-07-12 QXE2167 - Jul 12, 23:10 UTCJul 12, 23:40 UTC30m
2026-07-12 QXE2173 PDX → RDM Jul 12, 21:40 UTCJul 12, 22:10 UTC30m
2026-07-12 QXE2216 - Jul 12, 17:40 UTCJul 12, 20:05 UTC2h 25m
2026-07-12 QXE2215 PDX → TUS Jul 12, 14:05 UTCJul 12, 16:40 UTC2h 35m
2026-07-12 QXE2215 PDX → TUS Jul 12, 14:16 UTCJul 12, 16:44 UTC2h 28m
2026-07-12 QXE2335 SMF → PDX Jul 12, 02:20 UTCJul 12, 03:30 UTC1h 10m
2026-07-12 QXE2334 SAN → SMF Jul 12, 00:05 UTCJul 12, 01:15 UTC1h 10m
2026-07-11 QXE2187 - Jul 11, 20:30 UTCJul 11, 23:10 UTC2h 40m

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 57m ago.
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 QXE9986, QXE2251, QXE2161, QXE2117, QXE2113.