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
Broadcasting now · callsign QXE2182 · 35,000 ft
Flights observed
824
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:20 UTC

Current position

A84A55 is currently broadcasting. Map zoomed to live position.

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 Horizon Air 11 2026-07-26
QXE2306 Horizon Air 8 2026-06-26
QXE2095 Horizon Air 8 2026-07-24
QXE2437 - 7 2026-06-30
QXE2315 - 7 2026-07-16
QXE2308 - 7 2026-07-10
QXE2298 Horizon Air 7 2026-07-25
QXE2295 Horizon Air 7 2026-06-06
QXE2122 - 7 2026-07-03
QXE2117 Horizon Air 7 2026-07-18
QXE2069 - 7 2026-06-26
QXE2420 - 6 2026-07-18
QXE2337 - 6 2026-07-23
QXE2282 Horizon Air 6 2026-06-06
QXE2125 - 6 2026-07-11
QXE2116 - 6 2026-06-24
QXE2102 Horizon Air 6 2026-06-01
QXE2006 Horizon Air 6 2026-07-19
QXE2415 - 5 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2281 - Jul 26, 16:20 UTCJul 26, 17:15 UTC55m
2026-07-26 QXE2288 OAK → SAN Jul 26, 14:00 UTCJul 26, 15:10 UTC1h 10m
2026-07-26 QXE2285 LAX → SJC Jul 26, 04:38 UTCJul 26, 05:42 UTC1h 4m
2026-07-26 QXE2285 LAX → SJC Jul 26, 04:40 UTCJul 26, 05:45 UTC1h 5m
2026-07-26 QXE2058 SNA → PDX Jul 26, 02:20 UTCJul 26, 03:35 UTC1h 15m
2026-07-26 QXE2314 SAN → SFO Jul 26, 00:20 UTCJul 26, 01:20 UTC1h 0m
2026-07-25 QXE2050 FAI → ANC Jul 25, 21:10 UTCJul 25, 23:10 UTC2h 0m
2026-07-25 QXE2050 FAI → ANC Jul 25, 20:44 UTCJul 25, 23:06 UTC2h 22m
2026-07-25 QXE2022 RDM → SFO Jul 25, 18:35 UTCJul 25, 21:15 UTC2h 40m
2026-07-25 QXE2022 RDM → SFO Jul 25, 18:32 UTCJul 25, 19:45 UTC1h 13m
2026-07-25 QXE2298 SLC → SAN Jul 25, 14:55 UTCJul 25, 16:10 UTC1h 15m
2026-07-25 QXE2036 MSO → SEA Jul 25, 03:05 UTCJul 25, 04:35 UTC1h 30m
2026-07-25 QXE2036 MSO → SEA Jul 25, 03:02 UTCJul 25, 04:33 UTC1h 31m
2026-07-25 QXE2127 SEA → OAK Jul 25, 00:45 UTCJul 25, 01:45 UTC1h 0m
2026-07-25 QXE2127 SEA → OAK Jul 25, 00:39 UTCJul 25, 01:48 UTC1h 9m
2026-07-24 QXE2206 BOI → SEA Jul 24, 22:10 UTCJul 24, 23:20 UTC1h 10m
2026-07-24 QXE2365 LAX → SFO Jul 24, 19:45 UTCJul 24, 20:25 UTC40m
2026-07-24 QXE2126 SJC → SEA Jul 24, 18:05 UTCJul 24, 18:35 UTC30m
2026-07-24 QXE2095 SMF → PDX Jul 24, 15:40 UTCJul 24, 16:45 UTC1h 5m
2026-07-24 QXE2156 SFO → PDX Jul 24, 13:15 UTCJul 24, 14:25 UTC1h 10m
2026-07-24 QXE2034 SJC → PDX Jul 24, 03:15 UTCJul 24, 04:15 UTC1h 0m
2026-07-24 QXE2034 SJC → PDX Jul 24, 03:21 UTCJul 24, 04:14 UTC53m
2026-07-23 QXE2311 SEA → SEA Jul 23, 21:45 UTCJul 24, 01:10 UTC3h 25m
2026-07-23 QXE2336 SEA → PSC Jul 23, 17:50 UTCJul 23, 19:35 UTC1h 45m
2026-07-23 QXE2337 - Jul 23, 15:25 UTCJul 23, 16:50 UTC1h 25m
2026-07-23 QXE2011 PHX → SFO Jul 23, 13:20 UTCJul 23, 13:45 UTC25m
2026-07-23 QXE2228 PAE → SFO Jul 23, 05:20 UTCJul 23, 06:10 UTC50m
2026-07-23 QXE2056 SEA → SJC Jul 23, 00:50 UTCJul 23, 02:30 UTC1h 40m
2026-07-22 QXE2056 SEA → SJC Jul 22, 21:55 UTCJul 22, 23:45 UTC1h 50m
2026-07-22 QXE2003 SEA → OAK Jul 22, 20:00 UTCJul 22, 20:45 UTC45m
2026-07-22 QXE2225 - Jul 22, 18:05 UTCJul 22, 18:45 UTC40m
2026-07-22 QXE2397 - Jul 22, 14:10 UTCJul 22, 16:00 UTC1h 50m
2026-07-22 QXE2396 SFO → PAE Jul 22, 04:40 UTCJul 22, 05:25 UTC45m
2026-07-22 QXE2107 PAE → SFO Jul 22, 02:40 UTCJul 22, 03:20 UTC40m
2026-07-22 QXE2163 SJC → LAX Jul 22, 01:05 UTCJul 22, 01:45 UTC40m
2026-07-21 QXE2081 MFR → PDX Jul 21, 23:00 UTCJul 21, 23:40 UTC40m
2026-07-21 QXE2328 ABQ → PDX Jul 21, 20:30 UTCJul 21, 22:00 UTC1h 30m
2026-07-21 QXE2278 GEG → PDX Jul 21, 16:55 UTCJul 21, 19:15 UTC2h 20m
2026-07-21 QXE2278 GEG → PDX Jul 21, 16:50 UTCJul 21, 19:08 UTC2h 18m
2026-07-21 QXE2189 SAN → PAE Jul 21, 02:25 UTCJul 21, 04:50 UTC2h 25m
2026-07-21 QXE2406 FAI → ANC Jul 21, 00:00 UTCJul 21, 01:15 UTC1h 15m
2026-07-20 QXE2405 - Jul 20, 21:50 UTCJul 20, 23:05 UTC1h 15m
2026-07-20 QXE2216 BOI → SFO Jul 20, 17:35 UTCJul 20, 20:05 UTC2h 30m
2026-07-20 QXE2215 SAN → SFO Jul 20, 14:10 UTCJul 20, 16:45 UTC2h 35m
2026-07-20 QXE2053 PDX → SEA Jul 20, 12:30 UTCJul 20, 12:50 UTC20m
2026-07-20 QXE2047 - Jul 20, 06:05 UTCJul 20, 06:50 UTC45m
2026-07-20 QXE2047 SEA → EUG Jul 20, 06:00 UTCJul 20, 06:49 UTC49m
2026-07-20 QXE2017 AUS → SJC Jul 20, 02:55 UTCJul 20, 03:25 UTC30m
2026-07-20 QXE2008 SEA → YVR Jul 20, 00:45 UTCJul 20, 01:15 UTC30m
2026-07-19 QXE2015 - Jul 19, 22:50 UTCJul 19, 23:20 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?
Yes. Mode-S A84A55 is currently airborne.
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, QXE2095, QXE2437.