Apparatus

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sensors Mode-S transponder

A8A0C1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N655QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A8A0C1
Octal
52120301
Decimal
11,051,201
Country
US
Tail
N655QX
Type
E75L
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
824
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S A8A0C1.

Country allocation

The ICAO 24-bit address A8A0C1 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
QXE2175 - 12 2026-07-01
QXE2226 - 9 2026-07-16
QXE2120 Horizon Air 8 2026-06-07
QXE2094 Horizon Air 8 2026-07-24
QXE2152 Horizon Air 7 2026-07-23
QXE2138 Horizon Air 7 2026-07-19
QXE2117 Horizon Air 7 2026-05-09
QXE2371 - 6 2026-07-09
QXE2291 Horizon Air 6 2026-07-23
QXE2145 - 6 2026-06-23
QXE2123 - 6 2026-07-19
QXE2016 Horizon Air 6 2026-07-23
QXE2459 - 5 2026-07-16
QXE2443 Horizon Air 5 2026-05-19
QXE2415 - 5 2026-06-20
QXE2388 Horizon Air 5 2026-05-23
QXE2376 Horizon Air 5 2026-06-27
QXE2329 Horizon Air 5 2026-07-03
QXE2320 Horizon Air 5 2026-05-31
QXE2257 - 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2157 LAS → LAX Jul 26, 20:20 UTCJul 26, 21:40 UTC1h 20m
2026-07-26 QXE2399 SFO → PAE Jul 26, 18:10 UTCJul 26, 19:30 UTC1h 20m
2026-07-26 QXE2178 PDX → ONT Jul 26, 14:35 UTCJul 26, 16:15 UTC1h 40m
2026-07-26 QXE2029 LAX → SFO Jul 26, 00:55 UTCJul 26, 02:55 UTC2h 0m
2026-07-25 QXE2471 SLC → PDX Jul 25, 23:15 UTCJul 25, 23:50 UTC35m
2026-07-25 QXE2471 SLC → PDX Jul 25, 23:11 UTCJul 25, 23:44 UTC33m
2026-07-25 QXE2475 RDM → SEA Jul 25, 21:40 UTCJul 25, 22:10 UTC30m
2026-07-25 QXE2188 PDX → SEA Jul 25, 19:10 UTCJul 25, 20:30 UTC1h 20m
2026-07-25 QXE2188 PDX → SEA Jul 25, 19:07 UTCJul 25, 20:27 UTC1h 20m
2026-07-25 QXE2091 MFR → LAX Jul 25, 17:22 UTCJul 25, 18:10 UTC48m
2026-07-25 QXE2091 MFR → LAX Jul 25, 17:10 UTCJul 25, 18:10 UTC1h 0m
2026-07-25 QXE2253 RNO → SEA Jul 25, 15:20 UTCJul 25, 16:05 UTC45m
2026-07-25 QXE2253 RNO → SEA Jul 25, 15:15 UTCJul 25, 16:02 UTC47m
2026-07-25 QXE2305 SJC → PDX Jul 25, 05:35 UTCJul 25, 06:30 UTC55m
2026-07-25 QXE2342 RDM → SEA Jul 25, 02:15 UTCJul 25, 04:20 UTC2h 5m
2026-07-24 QXE2026 SMF → PDX Jul 24, 23:40 UTCJul 25, 01:10 UTC1h 30m
2026-07-24 QXE2025 PDX → SJC Jul 24, 20:50 UTCJul 24, 22:40 UTC1h 50m
2026-07-24 QXE2341 PDX → OAK Jul 24, 18:05 UTCJul 24, 19:50 UTC1h 45m
2026-07-24 QXE2224 SAN → PAE Jul 24, 14:45 UTCJul 24, 16:50 UTC2h 5m
2026-07-24 QXE2094 SEA → SMF Jul 24, 06:10 UTCJul 24, 06:50 UTC40m
2026-07-24 QXE2094 SEA → SMF Jul 24, 06:09 UTCJul 24, 06:58 UTC49m
2026-07-24 QXE2327 SJC → SEA Jul 24, 02:20 UTCJul 24, 03:35 UTC1h 15m
2026-07-23 QXE2322 SJC → PDX Jul 23, 23:50 UTCJul 24, 00:50 UTC1h 0m
2026-07-23 QXE2152 SEA → PUW Jul 23, 21:50 UTCJul 23, 22:35 UTC45m
2026-07-23 QXE2291 PDX → SMF Jul 23, 20:20 UTCJul 23, 21:00 UTC40m
2026-07-23 QXE2114 SJC → SEA Jul 23, 18:00 UTCJul 23, 19:00 UTC1h 0m
2026-07-23 QXE2111 SEA → PDX Jul 23, 16:05 UTCJul 23, 17:10 UTC1h 5m
2026-07-23 QXE2153 SFO → PHX Jul 23, 13:20 UTCJul 23, 14:20 UTC1h 0m
2026-07-23 QXE2154 PAE → SAN Jul 23, 04:10 UTCJul 23, 04:55 UTC45m
2026-07-23 QXE2016 SEA → OAK Jul 23, 01:25 UTCJul 23, 02:00 UTC35m
2026-07-22 QXE2007 - Jul 22, 23:35 UTCJul 23, 00:05 UTC30m
2026-07-22 QXE2000 ANC → OTZ Jul 22, 21:50 UTCJul 22, 22:05 UTC15m
2026-07-22 QXE2001 PSP → SFO Jul 22, 20:10 UTCJul 22, 20:25 UTC15m
2026-07-22 QXE2171 - Jul 22, 18:30 UTCJul 22, 19:05 UTC35m
2026-07-22 QXE2195 SEA → BIL Jul 22, 16:15 UTCJul 22, 16:45 UTC30m
2026-07-22 QXE2195 SEA → BIL Jul 22, 16:14 UTCJul 22, 16:50 UTC36m
2026-07-22 QXE2418 EUG → PDX Jul 22, 14:15 UTCJul 22, 14:45 UTC30m
2026-07-22 QXE2418 EUG → PDX Jul 22, 14:11 UTCJul 22, 14:44 UTC33m
2026-07-22 QXE2084 - Jul 22, 01:35 UTCJul 22, 03:25 UTC1h 50m
2026-07-21 QXE2353 - Jul 21, 23:10 UTCJul 22, 00:05 UTC55m
2026-07-21 QXE9985 GEG → SFO Jul 21, 18:10 UTCJul 21, 20:20 UTC2h 10m
2026-07-19 QXE2019 SEA → PDX Jul 19, 22:50 UTCJul 20, 01:25 UTC2h 35m
2026-07-19 QXE2019 SEA → PDX Jul 19, 22:46 UTCJul 20, 01:14 UTC2h 28m
2026-07-19 QXE2259 - Jul 19, 21:00 UTCJul 19, 21:45 UTC45m
2026-07-19 QXE2106 RDM → SFO Jul 19, 19:05 UTCJul 19, 20:05 UTC1h 0m
2026-07-19 QXE2106 RDM → SFO Jul 19, 19:03 UTCJul 19, 20:06 UTC1h 3m
2026-07-19 QXE2179 SAN → PAE Jul 19, 17:00 UTCJul 19, 17:40 UTC40m
2026-07-19 QXE2072 SEA → FCA Jul 19, 15:13 UTCJul 19, 16:02 UTC49m
2026-07-19 QXE2072 SEA → FCA Jul 19, 15:15 UTCJul 19, 16:05 UTC50m
2026-07-19 QXE2122 PDX → SFO Jul 19, 12:50 UTCJul 19, 13:55 UTC1h 5m

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 N655QX page for operator, model, and routing details .

Mode-S A8A0C1 frequently asked

What is Mode-S code A8A0C1?
A8A0C1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N655QX.
Where is Mode-S A8A0C1 registered?
Mode-S code A8A0C1 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 A8A0C1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8A0C1, octal 52120301, decimal 11,051,201.
What flights does A8A0C1 operate?
Mode-S A8A0C1 has broadcast 20 distinct callsigns, including QXE2175, QXE2226, QXE2120, QXE2094, QXE2152.