Apparatus

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sensors Mode-S transponder

A84A55

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N633QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A84A55
Octal
52045125
Decimal
11,029,077
Country
US
Tail
N633QX
Type
E75L
No current signal · last broadcast 3h ago
Flights observed
725
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A84A55.

Country allocation

The ICAO 24-bit address A84A55 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
QXE2307 - 11 2026-07-09
QXE2285 - 9 2026-06-29
QXE2306 Horizon Air 8 2026-06-26
QXE2437 - 7 2026-06-30
QXE2308 - 7 2026-07-10
QXE2295 Horizon Air 7 2026-06-06
QXE2122 - 7 2026-07-03
QXE2095 - 7 2026-07-04
QXE2069 - 7 2026-06-26
QXE2315 Horizon Air 6 2026-06-25
QXE2298 - 6 2026-06-29
QXE2282 Horizon Air 6 2026-06-06
QXE2125 - 6 2026-07-11
QXE2116 - 6 2026-06-24
QXE2102 Horizon Air 6 2026-06-01
QXE2415 - 5 2026-07-06
QXE2346 - 5 2026-07-14
QXE2337 Horizon Air 5 2026-06-06
QXE2135 Horizon Air 5 2026-06-26
QXE2117 - 5 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 QXE2346 - Jul 14, 06:25 UTCJul 14, 06:40 UTC15m
2026-07-13 QXE2191 SEA → SEA Jul 13, 21:25 UTCJul 14, 05:00 UTC7h 35m
2026-07-13 QXE2143 - Jul 13, 18:15 UTCJul 13, 20:05 UTC1h 50m
2026-07-13 QXE2142 - Jul 13, 15:15 UTCJul 13, 17:25 UTC2h 10m
2026-07-13 QXE2067 PUW → SEA Jul 13, 12:50 UTCJul 13, 13:40 UTC50m
2026-07-13 QXE2067 PUW → SEA Jul 13, 12:48 UTCJul 13, 13:33 UTC45m
2026-07-13 QXE2364 - Jul 13, 06:15 UTCJul 13, 06:55 UTC40m
2026-07-13 QXE2066 SBP → SEA Jul 13, 03:15 UTCJul 13, 05:10 UTC1h 55m
2026-07-13 QXE2066 SBP → SEA Jul 13, 03:15 UTCJul 13, 04:55 UTC1h 40m
2026-07-13 QXE2064 SEA → SBP Jul 13, 00:05 UTCJul 13, 02:20 UTC2h 15m
2026-07-12 QXE2275 - Jul 12, 22:35 UTCJul 12, 23:00 UTC25m
2026-07-12 QXE2155 - Jul 12, 21:05 UTCJul 12, 21:20 UTC15m
2026-07-12 QXE2241 - Jul 12, 18:50 UTCJul 12, 19:20 UTC30m
2026-07-12 QXE2048 - Jul 12, 17:05 UTCJul 12, 17:30 UTC25m
2026-07-12 QXE2070 SAN → SFO Jul 12, 14:25 UTCJul 12, 15:30 UTC1h 5m
2026-07-12 QXE2201 LAX → BOI Jul 12, 03:13 UTCJul 12, 04:22 UTC1h 9m
2026-07-12 QXE2201 - Jul 12, 02:55 UTCJul 12, 03:15 UTC20m
2026-07-11 QXE2329 - Jul 11, 23:50 UTCJul 12, 01:35 UTC1h 45m
2026-07-11 QXE2125 PDX → MFR Jul 11, 22:10 UTCJul 11, 23:00 UTC50m
2026-07-11 QXE2125 PDX → MFR Jul 11, 22:10 UTCJul 11, 22:54 UTC44m
2026-07-11 QXE2365 - Jul 11, 19:35 UTCJul 11, 20:20 UTC45m
2026-07-11 QXE2126 - Jul 11, 18:05 UTCJul 11, 18:30 UTC25m
2026-07-11 QXE2002 YVR → PDX Jul 11, 16:01 UTCJul 11, 16:38 UTC37m
2026-07-11 QXE2002 YVR → PDX Jul 11, 15:50 UTCJul 11, 16:45 UTC55m
2026-07-11 QXE2009 SEA → YVR Jul 11, 03:05 UTCJul 11, 03:35 UTC30m
2026-07-10 QXE2131 PDX → GEG Jul 10, 21:25 UTCJul 11, 00:40 UTC3h 15m
2026-07-10 QXE2133 PDX → SFO Jul 10, 17:55 UTCJul 10, 19:55 UTC2h 0m
2026-07-10 QXE2068 - Jul 10, 14:55 UTCJul 10, 16:55 UTC2h 0m
2026-07-10 QXE2148 YYC → SEA Jul 10, 12:15 UTCJul 10, 13:35 UTC1h 20m
2026-07-10 QXE2147 - Jul 10, 04:10 UTCJul 10, 05:15 UTC1h 5m
2026-07-10 QXE2308 YYC → SEA Jul 10, 01:30 UTCJul 10, 03:00 UTC1h 30m
2026-07-09 QXE2307 SEA → YYC Jul 9, 23:10 UTCJul 10, 00:20 UTC1h 10m
2026-07-09 QXE2205 RNO → LAX Jul 9, 21:10 UTCJul 9, 21:45 UTC35m
2026-07-09 QXE2256 SJC → PDX Jul 9, 16:50 UTCJul 9, 18:15 UTC1h 25m
2026-07-09 QXE2256 SJC → PDX Jul 9, 16:50 UTCJul 9, 18:19 UTC1h 29m
2026-07-09 QXE2080 - Jul 9, 14:30 UTCJul 9, 15:55 UTC1h 25m
2026-07-09 QXE2053 PDX → SEA Jul 9, 12:25 UTCJul 9, 12:45 UTC20m
2026-07-09 QXE2047 - Jul 9, 06:00 UTCJul 9, 06:45 UTC45m
2026-07-09 QXE2313 - Jul 9, 03:00 UTCJul 9, 03:40 UTC40m
2026-07-09 QXE2302 SEA → PDX Jul 9, 01:25 UTCJul 9, 01:50 UTC25m
2026-07-08 QXE2350 GEG → SEA Jul 8, 23:00 UTCJul 8, 23:45 UTC45m
2026-07-08 QXE2349 SEA → GEG Jul 8, 21:10 UTCJul 8, 21:50 UTC40m
2026-07-08 QXE2262 GEG → SEA Jul 8, 19:10 UTCJul 8, 19:55 UTC45m
2026-07-08 QXE2262 GEG → SEA Jul 8, 19:00 UTCJul 8, 19:52 UTC52m
2026-07-08 QXE2200 RDM → SEA Jul 8, 17:25 UTCJul 8, 18:05 UTC40m
2026-07-08 QXE2012 YVR → SEA Jul 8, 15:25 UTCJul 8, 15:55 UTC30m
2026-07-08 QXE2009 SEA → YVR Jul 8, 03:50 UTCJul 8, 04:15 UTC25m
2026-07-08 QXE2016 - Jul 8, 01:30 UTCJul 8, 02:05 UTC35m
2026-07-07 QXE2007 SEA → YVR Jul 7, 23:28 UTCJul 7, 23:58 UTC30m
2026-07-07 QXE2007 SEA → YVR Jul 7, 23:30 UTCJul 8, 00:00 UTC30m

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 N633QX page for operator, model, and routing details .

Mode-S A84A55 frequently asked

What is Mode-S code A84A55?
A84A55 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N633QX.
Where is Mode-S A84A55 registered?
Mode-S code A84A55 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 A84A55 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A84A55, octal 52045125, decimal 11,029,077.
What flights does A84A55 operate?
Mode-S A84A55 has broadcast 20 distinct callsigns, including QXE2307, QXE2285, QXE2306, QXE2437, QXE2308.