Apparatus

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sensors Mode-S transponder

A81F1F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N622QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A81F1F
Octal
52017437
Decimal
11,018,015
Country
US
Tail
N622QX
Type
E75L
No current signal · last broadcast 9h ago
Flights observed
720
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A81F1F.

Country allocation

The ICAO 24-bit address A81F1F 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
QXE2306 - 8 2026-07-10
QXE2001 - 8 2026-07-03
QXE2328 - 7 2026-07-02
QXE2172 - 7 2026-07-14
QXE2121 - 7 2026-06-28
QXE2099 Horizon Air 7 2026-05-02
QXE2084 - 7 2026-07-10
QXE2421 - 6 2026-07-14
QXE2353 - 6 2026-07-09
QXE2352 - 6 2026-07-01
QXE2287 - 6 2026-07-07
QXE2117 - 6 2026-06-30
QXE2115 - 6 2026-06-25
QXE2109 - 6 2026-07-01
QXE2088 - 6 2026-07-03
QXE2011 - 6 2026-07-09
QXE2000 - 6 2026-07-03
QXE2347 - 5 2026-06-19
QXE2346 - 5 2026-06-19
QXE2330 - 5 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 QXE2189 SAN → PAE Jul 15, 02:10 UTCJul 15, 04:30 UTC2h 20m
2026-07-14 QXE2406 - Jul 14, 23:55 UTCJul 15, 01:10 UTC1h 15m
2026-07-14 QXE2405 - Jul 14, 21:45 UTCJul 14, 23:05 UTC1h 19m
2026-07-14 QXE2216 - Jul 14, 17:40 UTCJul 14, 20:05 UTC2h 25m
2026-07-14 QXE2215 - Jul 14, 14:10 UTCJul 14, 16:50 UTC2h 40m
2026-07-14 QXE2377 - Jul 14, 06:50 UTCJul 14, 07:25 UTC35m
2026-07-14 QXE2377 SEA → PDX Jul 14, 06:48 UTCJul 14, 07:26 UTC38m
2026-07-14 QXE2421 PDX → SEA Jul 14, 04:50 UTCJul 14, 05:20 UTC30m
2026-07-14 QXE2218 - Jul 14, 03:10 UTCJul 14, 03:35 UTC25m
2026-07-14 QXE2218 RDM → PDX Jul 14, 03:21 UTCJul 14, 03:35 UTC14m
2026-07-14 QXE2172 - Jul 14, 01:55 UTCJul 14, 02:25 UTC30m
2026-07-13 QXE2297 - Jul 13, 23:10 UTCJul 14, 00:55 UTC1h 45m
2026-07-13 QXE2368 - Jul 13, 20:50 UTCJul 13, 21:40 UTC50m
2026-07-13 QXE2333 SLC → PDX Jul 13, 18:05 UTCJul 13, 19:35 UTC1h 30m
2026-07-13 QXE2333 - Jul 13, 15:25 UTCJul 13, 17:00 UTC1h 35m
2026-07-13 QXE2432 - Jul 13, 14:05 UTCJul 13, 14:35 UTC30m
2026-07-13 QXE2431 - Jul 13, 12:10 UTCJul 13, 12:35 UTC25m
2026-07-13 QXE9990 - Jul 13, 07:30 UTCJul 13, 08:35 UTC1h 5m
2026-07-13 QXE9990 STS → PDX Jul 13, 07:28 UTCJul 13, 08:33 UTC1h 5m
2026-07-11 QXE2458 - Jul 11, 23:25 UTCJul 12, 00:40 UTC1h 15m
2026-07-11 QXE2458 LAS → STS Jul 11, 23:24 UTCJul 12, 00:51 UTC1h 27m
2026-07-11 QXE2459 - Jul 11, 21:15 UTCJul 11, 22:30 UTC1h 15m
2026-07-11 QXE2330 - Jul 11, 17:55 UTCJul 11, 19:20 UTC1h 25m
2026-07-11 QXE2232 - Jul 11, 14:15 UTCJul 11, 16:05 UTC1h 50m
2026-07-11 QXE2232 ONT → PDX Jul 11, 14:18 UTCJul 11, 16:05 UTC1h 47m
2026-07-11 QXE2301 - Jul 11, 05:50 UTCJul 11, 07:55 UTC2h 5m
2026-07-11 QXE2372 - Jul 11, 02:35 UTCJul 11, 03:10 UTC35m
2026-07-11 QXE2016 YVR → SEA Jul 11, 00:40 UTCJul 11, 01:15 UTC35m
2026-07-10 QXE2007 SEA → YVR Jul 10, 22:45 UTCJul 10, 23:20 UTC35m
2026-07-10 QXE2306 - Jul 10, 20:20 UTCJul 10, 21:00 UTC40m
2026-07-10 QXE2306 - Jul 10, 18:35 UTCJul 10, 19:05 UTC30m
2026-07-10 QXE2166 - Jul 10, 16:10 UTCJul 10, 17:30 UTC1h 20m
2026-07-10 QXE2161 - Jul 10, 14:10 UTCJul 10, 15:00 UTC50m
2026-07-10 QXE2377 SEA → PDX Jul 10, 06:35 UTCJul 10, 07:10 UTC35m
2026-07-10 QXE2084 - Jul 10, 04:05 UTCJul 10, 05:20 UTC1h 15m
2026-07-10 QXE2084 BIL → SEA Jul 10, 03:28 UTCJul 10, 05:12 UTC1h 44m
2026-07-09 QXE2353 - Jul 9, 23:20 UTCJul 10, 00:15 UTC55m
2026-07-09 QXE2133 PDX → SFO Jul 9, 18:10 UTCJul 9, 20:10 UTC2h 0m
2026-07-09 QXE2068 SEA → SBP Jul 9, 15:30 UTCJul 9, 17:25 UTC1h 55m
2026-07-09 QXE2011 YVR → SEA Jul 9, 13:20 UTCJul 9, 13:45 UTC25m
2026-07-09 QXE2009 SEA → YVR Jul 9, 03:25 UTCJul 9, 04:00 UTC35m
2026-07-09 QXE2016 YVR → SEA Jul 9, 01:15 UTCJul 9, 01:40 UTC25m
2026-07-08 QXE2007 SEA → YVR Jul 8, 23:25 UTCJul 8, 23:55 UTC30m
2026-07-08 QXE2205 RNO → LAX Jul 8, 21:20 UTCJul 8, 21:50 UTC30m
2026-07-08 QXE2181 SEA → PDX Jul 8, 19:50 UTCJul 8, 20:25 UTC35m
2026-07-08 QXE2141 AUS → SJC Jul 8, 14:20 UTCJul 8, 18:15 UTC3h 55m
2026-07-08 QXE2227 PDX → SEA Jul 8, 12:35 UTCJul 8, 12:55 UTC20m
2026-07-08 QXE2227 PDX → SEA Jul 8, 12:25 UTCJul 8, 12:49 UTC24m
2026-07-08 QXE2299 RDD → SEA Jul 8, 06:30 UTCJul 8, 06:45 UTC15m
2026-07-07 QXE2286 - Jul 7, 23:40 UTCJul 8, 00:55 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 N622QX page for operator, model, and routing details .

Mode-S A81F1F frequently asked

What is Mode-S code A81F1F?
A81F1F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N622QX.
Where is Mode-S A81F1F registered?
Mode-S code A81F1F 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 A81F1F broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A81F1F, octal 52017437, decimal 11,018,015.
What flights does A81F1F operate?
Mode-S A81F1F has broadcast 20 distinct callsigns, including QXE2306, QXE2001, QXE2328, QXE2172, QXE2121.