Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 QXE2328 · 36,000 ft
Flights observed
763
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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 - 13 2026-06-19
QXE2330 - 8 2026-07-02
QXE2286 - 7 2026-07-10
QXE2120 Horizon Air 7 2026-05-29
QXE2007 - 7 2026-06-19
QXE2154 Horizon Air 6 2026-06-09
QXE2148 - 6 2026-06-29
QXE2136 - 6 2026-06-25
QXE2086 Horizon Air 6 2026-05-30
QXE2081 - 6 2026-06-26
QXE2016 Horizon Air 6 2026-06-20
QXE2013 - 6 2026-07-05
QXE2004 - 6 2026-07-05
QXE2452 - 5 2026-07-10
QXE2415 Horizon Air 5 2026-05-20
QXE2329 Horizon Air 5 2026-07-01
QXE2325 - 5 2026-07-09
QXE2314 Horizon Air 5 2026-04-20
QXE2284 - 5 2026-07-12
QXE2276 Horizon Air 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QXE2278 - Jul 14, 16:50 UTCJul 14, 19:20 UTC2h 30m
2026-07-14 QXE9988 - Jul 14, 15:10 UTCJul 14, 15:20 UTC10m
2026-07-14 QXE2189 - Jul 14, 04:00 UTCJul 14, 06:15 UTC2h 15m
2026-07-14 QXE2406 SMF → SAN Jul 14, 01:05 UTCJul 14, 02:30 UTC1h 25m
2026-07-13 QXE2405 PDX → SMF Jul 13, 22:05 UTCJul 13, 23:25 UTC1h 20m
2026-07-13 QXE2269 ABQ → PDX Jul 13, 17:50 UTCJul 13, 20:15 UTC2h 25m
2026-07-13 QXE2268 - Jul 13, 14:15 UTCJul 13, 16:45 UTC2h 30m
2026-07-13 QXE2023 - Jul 13, 07:10 UTCJul 13, 08:20 UTC1h 10m
2026-07-13 QXE2248 - Jul 13, 03:25 UTCJul 13, 05:35 UTC2h 10m
2026-07-12 QXE2279 LAX → PAE Jul 12, 23:25 UTCJul 13, 01:35 UTC2h 10m
2026-07-12 QXE2323 EUG → LAX Jul 12, 20:15 UTCJul 12, 22:20 UTC2h 5m
2026-07-12 QXE2324 - Jul 12, 17:45 UTCJul 12, 19:20 UTC1h 35m
2026-07-12 QXE2075 - Jul 12, 14:15 UTCJul 12, 16:15 UTC2h 0m
2026-07-12 QXE2075 RDM → LAX Jul 12, 14:12 UTCJul 12, 16:02 UTC1h 50m
2026-07-12 QXE2162 - Jul 12, 04:25 UTCJul 12, 06:01 UTC1h 35m
2026-07-12 QXE2284 - Jul 12, 01:20 UTCJul 12, 03:20 UTC2h 0m
2026-07-11 QXE2061 SEA → BOI Jul 11, 23:25 UTCJul 12, 00:25 UTC1h 0m
2026-07-11 QXE2055 - Jul 11, 20:00 UTCJul 11, 21:45 UTC1h 45m
2026-07-11 QXE2054 - Jul 11, 17:25 UTCJul 11, 18:50 UTC1h 25m
2026-07-11 QXE2108 - Jul 11, 15:30 UTCJul 11, 16:05 UTC35m
2026-07-11 QXE2432 SEA → PDX Jul 11, 13:45 UTCJul 11, 14:15 UTC30m
2026-07-11 QXE2431 - Jul 11, 12:10 UTCJul 11, 12:40 UTC30m
2026-07-11 QXE2377 SEA → PDX Jul 11, 06:45 UTCJul 11, 07:20 UTC35m
2026-07-11 QXE2309 PUW → SEA Jul 11, 03:55 UTCJul 11, 04:50 UTC55m
2026-07-11 QXE2293 - Jul 11, 02:30 UTCJul 11, 03:10 UTC40m
2026-07-10 QXE2286 - Jul 10, 23:35 UTCJul 11, 00:45 UTC1h 10m
2026-07-10 QXE2287 SEA → RDD Jul 10, 21:10 UTCJul 10, 22:30 UTC1h 20m
2026-07-10 QXE2336 - Jul 10, 18:10 UTCJul 10, 19:45 UTC1h 35m
2026-07-10 QXE2337 - Jul 10, 15:35 UTCJul 10, 17:00 UTC1h 25m
2026-07-10 QXE2452 MFR → SEA Jul 10, 13:15 UTCJul 10, 14:15 UTC1h 0m
2026-07-10 QXE2266 PDX → MFR Jul 10, 05:10 UTCJul 10, 05:50 UTC40m
2026-07-10 QXE2266 PDX → MFR Jul 10, 05:07 UTCJul 10, 05:47 UTC40m
2026-07-10 QXE2387 SJC → SAN Jul 10, 03:45 UTCJul 10, 04:15 UTC30m
2026-07-10 QXE2339 EUG → SEA Jul 10, 00:50 UTCJul 10, 01:40 UTC50m
2026-07-09 QXE2338 SEA → EUG Jul 9, 22:55 UTCJul 9, 23:45 UTC50m
2026-07-09 QXE2400 - Jul 9, 21:05 UTCJul 9, 21:55 UTC50m
2026-07-09 QXE2400 SEA → RDM Jul 9, 19:20 UTCJul 9, 20:00 UTC40m
2026-07-09 QXE2325 - Jul 9, 16:40 UTCJul 9, 17:55 UTC1h 15m
2026-07-09 QXE2325 SUN → SEA Jul 9, 16:27 UTCJul 9, 17:39 UTC1h 12m
2026-07-09 QXE2202 - Jul 9, 14:15 UTCJul 9, 15:10 UTC55m
2026-07-09 QXE2065 PDX → SFO Jul 9, 12:15 UTCJul 9, 13:00 UTC45m
2026-07-09 QXE2272 - Jul 9, 02:15 UTCJul 9, 04:30 UTC2h 15m
2026-07-09 QXE2272 SNA → GEG Jul 9, 02:12 UTCJul 9, 04:27 UTC2h 15m
2026-07-08 QXE2019 SEA → PDX Jul 8, 22:45 UTCJul 9, 01:10 UTC2h 25m
2026-07-08 QXE2259 - Jul 8, 21:05 UTCJul 8, 21:50 UTC45m
2026-07-08 QXE2106 RDM → SFO Jul 8, 19:15 UTCJul 8, 20:10 UTC55m
2026-07-08 QXE2076 - Jul 8, 17:15 UTCJul 8, 18:00 UTC45m
2026-07-08 QXE2079 SEA → RDM Jul 8, 15:40 UTCJul 8, 16:20 UTC40m
2026-07-08 QXE2347 - Jul 8, 13:30 UTCJul 8, 13:55 UTC25m
2026-07-08 QXE2346 - Jul 8, 06:30 UTCJul 8, 06:50 UTC20m

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, QXE2286, QXE2120, QXE2007.