Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A8C840

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N665QX · operated by HORIZON AIR INDUSTRIES INC

Hex
A8C840
Octal
52144100
Decimal
11,061,312
Country
US
Tail
N665QX
Type
E75L
Broadcasting now · callsign QXE2150 · 33,000 ft
Flights observed
827
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Current position

A8C840 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A8C840 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
QXE2302 Horizon Air 10 2026-06-08
QXE2190 - 10 2026-07-18
QXE2117 - 9 2026-06-29
QXE2406 Horizon Air 8 2026-07-22
QXE2327 - 8 2026-07-10
QXE2100 - 8 2026-07-17
QXE2305 - 7 2026-07-20
QXE2282 Horizon Air 7 2026-07-17
QXE2209 - 7 2026-07-21
QXE2184 - 7 2026-07-13
QXE2081 - 7 2026-07-16
QXE2055 Horizon Air 7 2026-07-18
QXE2405 Horizon Air 6 2026-07-21
QXE2329 Horizon Air 6 2026-06-15
QXE2285 Horizon Air 6 2026-06-07
QXE2221 Horizon Air 6 2026-07-22
QXE2198 - 6 2026-07-13
QXE2187 - 6 2026-07-10
QXE2172 Horizon Air 6 2026-05-17
QXE2120 Horizon Air 6 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2133 PDX → SFO Jul 26, 18:45 UTCJul 26, 20:35 UTC1h 50m
2026-07-26 QXE2068 SFO → PAE Jul 26, 15:36 UTCJul 26, 17:46 UTC2h 10m
2026-07-26 QXE2068 SFO → PAE Jul 26, 15:40 UTCJul 26, 17:55 UTC2h 15m
2026-07-26 QXE2148 LAX → SFO Jul 26, 12:20 UTCJul 26, 13:45 UTC1h 25m
2026-07-26 QXE2147 SFO → LAX Jul 26, 04:17 UTCJul 26, 05:08 UTC51m
2026-07-26 QXE2147 SFO → LAX Jul 26, 04:05 UTCJul 26, 05:10 UTC1h 5m
2026-07-26 QXE2308 SJC → PDX Jul 26, 01:30 UTCJul 26, 03:00 UTC1h 30m
2026-07-25 QXE2307 GEG → SFO Jul 25, 23:25 UTCJul 26, 00:30 UTC1h 5m
2026-07-25 QXE2205 RNO → LAX Jul 25, 21:25 UTCJul 25, 22:00 UTC35m
2026-07-25 QXE2181 SEA → GEG Jul 25, 19:40 UTCJul 25, 20:15 UTC35m
2026-07-25 QXE2181 SEA → GEG Jul 25, 19:39 UTCJul 25, 20:15 UTC36m
2026-07-25 QXE2141 AUS → SJC Jul 25, 14:20 UTCJul 25, 18:15 UTC3h 55m
2026-07-25 QXE2227 PDX → SEA Jul 25, 12:35 UTCJul 25, 12:55 UTC20m
2026-07-25 QXE2299 RDD → SEA Jul 25, 06:25 UTCJul 25, 06:40 UTC15m
2026-07-24 QXE2306 LAX → GEG Jul 24, 20:35 UTCJul 24, 21:10 UTC35m
2026-07-24 QXE2306 LAX → GEG Jul 24, 19:05 UTCJul 24, 19:40 UTC35m
2026-07-24 QXE2166 BET → ANC Jul 24, 16:50 UTCJul 24, 18:00 UTC1h 10m
2026-07-24 QXE2166 BET → ANC Jul 24, 16:49 UTCJul 24, 17:50 UTC1h 1m
2026-07-24 QXE2161 PDX → BIL Jul 24, 14:05 UTCJul 24, 14:55 UTC50m
2026-07-24 QXE2161 PDX → BIL Jul 24, 14:01 UTCJul 24, 14:58 UTC57m
2026-07-23 QXE9991 PHX → LAS Jul 23, 20:25 UTCJul 23, 21:10 UTC45m
2026-07-23 QXE2070 SAN → SFO Jul 23, 14:40 UTCJul 23, 15:45 UTC1h 5m
2026-07-22 QXE2221 PDX → OAK Jul 22, 19:40 UTCJul 22, 22:00 UTC2h 20m
2026-07-22 QXE2437 PAE → SAN Jul 22, 15:05 UTCJul 22, 17:35 UTC2h 30m
2026-07-22 QXE2189 SAN → PAE Jul 22, 02:30 UTCJul 22, 04:50 UTC2h 20m
2026-07-22 QXE2406 FAI → ANC Jul 22, 00:20 UTCJul 22, 01:40 UTC1h 20m
2026-07-21 QXE2405 SJC → PDX Jul 21, 21:55 UTCJul 21, 23:10 UTC1h 15m
2026-07-21 QXE2209 - Jul 21, 19:35 UTCJul 21, 20:30 UTC55m
2026-07-21 QXE2089 - Jul 21, 17:45 UTCJul 21, 18:45 UTC1h 0m
2026-07-21 QXE2089 PDX → BOI Jul 21, 17:42 UTCJul 21, 18:41 UTC59m
2026-07-21 QXE2316 SJC → LAX Jul 21, 14:35 UTCJul 21, 16:15 UTC1h 40m
2026-07-21 QXE2316 SJC → LAX Jul 21, 14:49 UTCJul 21, 16:04 UTC1h 15m
2026-07-21 QXE2315 SEA → MSO Jul 21, 04:45 UTCJul 21, 06:30 UTC1h 45m
2026-07-21 QXE2371 PDX → ANC Jul 21, 02:35 UTCJul 21, 03:30 UTC55m
2026-07-21 QXE2104 PDX → BZN Jul 21, 00:40 UTCJul 21, 01:35 UTC55m
2026-07-20 QXE2318 RDM → SAN Jul 20, 21:50 UTCJul 20, 23:35 UTC1h 45m
2026-07-20 QXE2177 OAK → SEA Jul 20, 20:25 UTCJul 20, 21:05 UTC40m
2026-07-20 QXE2210 SJC → SEA Jul 20, 18:35 UTCJul 20, 19:25 UTC50m
2026-07-20 QXE2208 SEA → SFO Jul 20, 16:25 UTCJul 20, 17:10 UTC45m
2026-07-20 QXE2252 - Jul 20, 14:40 UTCJul 20, 15:25 UTC45m
2026-07-20 QXE2305 SAN → LAS Jul 20, 05:31 UTCJul 20, 06:14 UTC43m
2026-07-20 QXE2305 - Jul 20, 05:25 UTCJul 20, 06:20 UTC55m
2026-07-20 QXE2342 RDM → SEA Jul 20, 02:10 UTCJul 20, 04:15 UTC2h 5m
2026-07-19 QXE2026 - Jul 19, 23:30 UTCJul 20, 01:05 UTC1h 35m
2026-07-19 QXE2026 ONT → BOI Jul 19, 23:38 UTCJul 20, 01:03 UTC1h 25m
2026-07-19 QXE2025 - Jul 19, 20:50 UTCJul 19, 22:40 UTC1h 50m
2026-07-19 QXE2341 - Jul 19, 18:00 UTCJul 19, 19:55 UTC1h 55m
2026-07-19 QXE2224 - Jul 19, 14:35 UTCJul 19, 16:35 UTC2h 0m
2026-07-19 QXE2162 SFO → SNA Jul 19, 04:05 UTCJul 19, 05:40 UTC1h 35m
2026-07-19 QXE2284 SEA → FCA Jul 19, 01:10 UTCJul 19, 03:05 UTC1h 55m

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 N665QX page for operator, model, and routing details .

Mode-S A8C840 frequently asked

What is Mode-S code A8C840?
A8C840 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N665QX.
Where is Mode-S A8C840 registered?
Mode-S code A8C840 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 A8C840 broadcasting right now?
Yes. Mode-S A8C840 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8C840, octal 52144100, decimal 11,061,312.
What flights does A8C840 operate?
Mode-S A8C840 has broadcast 20 distinct callsigns, including QXE2302, QXE2190, QXE2117, QXE2406, QXE2327.