Apparatus

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sensors Mode-S transponder

A87942

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N645QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A87942
Octal
52074502
Decimal
11,041,090
Country
US
Tail
N645QX
Type
E75L
Broadcasting now · callsign QXE2103 · 4,050 ft
Flights observed
851
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Current position

A87942 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A87942 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
QXE2001 Horizon Air 14 2026-07-23
QXE2330 - 8 2026-07-02
QXE2007 Horizon Air 8 2026-07-23
QXE2286 - 7 2026-07-10
QXE2120 Horizon Air 7 2026-05-29
QXE2081 - 7 2026-07-14
QXE2016 Horizon Air 7 2026-07-24
QXE2013 Horizon Air 7 2026-07-21
QXE2004 - 7 2026-07-21
QXE2421 Horizon Air 6 2026-07-26
QXE2328 - 6 2026-07-14
QXE2314 - 6 2026-07-16
QXE2195 Horizon Air 6 2026-07-23
QXE2175 - 6 2026-07-18
QXE2154 Horizon Air 6 2026-06-09
QXE2148 - 6 2026-06-29
QXE2136 - 6 2026-06-25
QXE2110 Horizon Air 6 2026-07-25
QXE2086 Horizon Air 6 2026-05-30
QXE2010 Horizon Air 6 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2359 PDX → MSO Jul 26, 22:00 UTCJul 26, 22:25 UTC25m
2026-07-26 QXE2149 SFO → LAX Jul 26, 20:25 UTCJul 26, 20:55 UTC30m
2026-07-26 QXE2207 PAE → PSP Jul 26, 17:50 UTCJul 26, 18:55 UTC1h 5m
2026-07-26 QXE2183 RDM → SFO Jul 26, 16:00 UTCJul 26, 16:45 UTC45m
2026-07-26 QXE2347 YVR → PDX Jul 26, 13:30 UTCJul 26, 13:55 UTC25m
2026-07-26 QXE2346 PDX → SEA Jul 26, 06:20 UTCJul 26, 06:30 UTC10m
2026-07-26 QXE2421 LAX → PAE Jul 26, 04:40 UTCJul 26, 05:10 UTC30m
2026-07-26 QXE2421 LAX → PAE Jul 26, 04:35 UTCJul 26, 05:04 UTC29m
2026-07-26 QXE2302 SEA → SMF Jul 26, 01:20 UTCJul 26, 01:50 UTC30m
2026-07-25 QXE2110 SAN → SFO Jul 25, 23:10 UTCJul 26, 00:15 UTC1h 5m
2026-07-25 QXE2105 SFO → SEA Jul 25, 21:10 UTCJul 25, 21:55 UTC45m
2026-07-25 QXE2262 RDM → SEA Jul 25, 19:00 UTCJul 25, 19:40 UTC40m
2026-07-25 QXE2200 RDM → SEA Jul 25, 17:20 UTCJul 25, 18:00 UTC40m
2026-07-25 QXE2200 RDM → SEA Jul 25, 17:16 UTCJul 25, 17:56 UTC40m
2026-07-25 QXE2012 RDM → SFO Jul 25, 15:15 UTCJul 25, 15:45 UTC30m
2026-07-25 QXE2010 IDA → SEA Jul 25, 06:30 UTCJul 25, 07:05 UTC35m
2026-07-24 QXE2016 SEA → OAK Jul 24, 01:05 UTCJul 24, 01:30 UTC25m
2026-07-23 QXE2007 SJC → AUS Jul 23, 23:15 UTCJul 23, 23:50 UTC35m
2026-07-23 QXE2000 ANC → OTZ Jul 23, 21:40 UTCJul 23, 22:05 UTC25m
2026-07-23 QXE2001 PSP → SFO Jul 23, 20:15 UTCJul 23, 20:30 UTC15m
2026-07-23 QXE2171 RLD → SEA Jul 23, 18:05 UTCJul 23, 18:45 UTC40m
2026-07-23 QXE2195 SEA → BIL Jul 23, 16:35 UTCJul 23, 17:05 UTC30m
2026-07-23 QXE2418 EUG → PDX Jul 23, 14:15 UTCJul 23, 14:50 UTC35m
2026-07-23 QXE2403 - Jul 23, 06:40 UTCJul 23, 07:15 UTC35m
2026-07-23 QXE2066 SBP → SEA Jul 23, 03:05 UTCJul 23, 04:55 UTC1h 50m
2026-07-23 QXE2066 SBP → SEA Jul 23, 03:01 UTCJul 23, 04:47 UTC1h 46m
2026-07-23 QXE2064 PDX → SEA Jul 23, 00:10 UTCJul 23, 02:20 UTC2h 10m
2026-07-22 QXE2359 PDX → MSO Jul 22, 22:05 UTCJul 22, 22:35 UTC30m
2026-07-22 QXE2149 SFO → LAX Jul 22, 20:35 UTCJul 22, 21:00 UTC25m
2026-07-22 QXE2159 - Jul 22, 18:10 UTCJul 22, 19:15 UTC1h 5m
2026-07-22 QXE2031 MFR → SEA Jul 22, 16:00 UTCJul 22, 16:40 UTC40m
2026-07-22 QXE2404 PDX → GEG Jul 22, 14:15 UTCJul 22, 15:00 UTC45m
2026-07-22 QXE2387 SJC → SAN Jul 22, 03:40 UTCJul 22, 04:15 UTC35m
2026-07-21 QXE2310 SEA → YVR Jul 21, 21:15 UTCJul 22, 00:50 UTC3h 35m
2026-07-21 QXE2013 PDX → BZN Jul 21, 19:20 UTCJul 21, 19:55 UTC35m
2026-07-21 QXE2004 - Jul 21, 17:40 UTCJul 21, 18:10 UTC30m
2026-07-21 QXE2027 RDM → SEA Jul 21, 14:25 UTCJul 21, 15:10 UTC45m
2026-07-21 QXE2223 SJC → BOI Jul 21, 04:00 UTCJul 21, 05:45 UTC1h 45m
2026-07-21 QXE2296 RNO → LAS Jul 21, 02:05 UTCJul 21, 02:55 UTC50m
2026-07-20 QXE2260 SFO → SNA Jul 20, 23:20 UTCJul 21, 00:00 UTC39m
2026-07-20 QXE2176 AKN → ANC Jul 20, 21:05 UTCJul 20, 21:30 UTC25m
2026-07-20 QXE2176 AKN → ANC Jul 20, 21:05 UTCJul 20, 21:50 UTC45m
2026-07-20 QXE2317 PAE → SFO Jul 20, 18:10 UTCJul 20, 20:05 UTC1h 55m
2026-07-20 QXE2317 PAE → SFO Jul 20, 18:07 UTCJul 20, 20:02 UTC1h 55m
2026-07-20 QXE2002 - Jul 20, 16:00 UTCJul 20, 16:45 UTC45m
2026-07-20 QXE2010 IDA → SEA Jul 20, 07:20 UTCJul 20, 07:50 UTC30m
2026-07-20 QXE2010 IDA → SEA Jul 20, 07:17 UTCJul 20, 07:45 UTC28m
2026-07-20 QXE2352 PSP → SFO Jul 20, 03:55 UTCJul 20, 05:05 UTC1h 10m
2026-07-20 QXE2109 - Jul 20, 00:55 UTCJul 20, 01:55 UTC1h 0m
2026-07-19 QXE2119 SAN → SFO Jul 19, 22:45 UTCJul 19, 23:30 UTC45m

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 N645QX page for operator, model, and routing details .

Mode-S A87942 frequently asked

What is Mode-S code A87942?
A87942 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N645QX.
Where is Mode-S A87942 registered?
Mode-S code A87942 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 A87942 broadcasting right now?
Yes. Mode-S A87942 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A87942, octal 52074502, decimal 11,041,090.
What flights does A87942 operate?
Mode-S A87942 has broadcast 20 distinct callsigns, including QXE2001, QXE2330, QXE2007, QXE2286, QXE2120.