Apparatus

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sensors Mode-S transponder

A831B2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N627QX · EMBRAER ERJ-170-200 (long wing) · operated by HORIZON AIR INDUSTRIES INC

Hex
A831B2
Octal
52030662
Decimal
11,022,770
Country
US
Tail
N627QX
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
808
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A831B2.

Country allocation

The ICAO 24-bit address A831B2 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 Horizon Air 13 2026-07-26
QXE2187 - 9 2026-06-29
QXE2180 - 9 2026-07-14
QXE2102 Horizon Air 8 2026-06-08
QXE2443 Horizon Air 7 2026-05-31
QXE2050 - 7 2026-07-06
QXE2437 - 6 2026-07-01
QXE2432 - 6 2026-07-16
QXE2405 - 6 2026-07-10
QXE2400 - 6 2026-07-12
QXE2281 Horizon Air 6 2026-06-21
QXE2190 - 6 2026-06-23
QXE2138 Horizon Air 6 2026-07-23
QXE2100 Horizon Air 6 2026-07-26
QXE2075 - 6 2026-07-15
QXE2025 Horizon Air 6 2026-05-19
QXE2018 Horizon Air 6 2026-07-07
QXE2016 Horizon Air 6 2026-06-18
QXE2416 - 5 2026-06-21
QXE2412 Horizon Air 5 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 QXE2024 SAN → PAE Jul 26, 20:45 UTCJul 26, 21:45 UTC1h 0m
2026-07-26 QXE2101 LAX → SFO Jul 26, 17:20 UTCJul 26, 18:35 UTC1h 15m
2026-07-26 QXE2100 SEA → PSC Jul 26, 15:00 UTCJul 26, 16:10 UTC1h 10m
2026-07-26 QXE2100 SEA → PSC Jul 26, 14:57 UTCJul 26, 16:09 UTC1h 12m
2026-07-26 QXE2174 PDX → SFO Jul 26, 13:05 UTCJul 26, 13:50 UTC45m
2026-07-26 QXE2175 SJC → PDX Jul 26, 05:45 UTCJul 26, 06:25 UTC40m
2026-07-26 QXE2229 PDX → SFO Jul 26, 03:30 UTCJul 26, 04:45 UTC1h 15m
2026-07-26 QXE2082 OAK → SEA Jul 26, 01:00 UTCJul 26, 02:35 UTC1h 35m
2026-07-26 QXE2082 OAK → SEA Jul 26, 00:59 UTCJul 26, 02:30 UTC1h 31m
2026-07-25 QXE2297 PHX → PAE Jul 25, 22:25 UTCJul 25, 23:40 UTC1h 15m
2026-07-25 QXE2368 SEA → YVR Jul 25, 19:20 UTCJul 25, 20:40 UTC1h 20m
2026-07-25 QXE2368 SEA → YVR Jul 25, 19:29 UTCJul 25, 20:47 UTC1h 18m
2026-07-25 QXE2256 PDX → OAK Jul 25, 16:55 UTCJul 25, 18:15 UTC1h 20m
2026-07-25 QXE2256 PDX → OAK Jul 25, 16:50 UTCJul 25, 18:23 UTC1h 33m
2026-07-25 QXE2080 ANC → PDX Jul 25, 14:25 UTCJul 25, 16:05 UTC1h 40m
2026-07-25 QXE2043 PDX → SBP Jul 25, 12:30 UTCJul 25, 13:00 UTC30m
2026-07-25 QXE2223 SJC → BOI Jul 25, 04:25 UTCJul 25, 06:15 UTC1h 50m
2026-07-25 QXE2296 RNO → LAS Jul 25, 02:35 UTCJul 25, 03:25 UTC50m
2026-07-24 QXE2260 SFO → SNA Jul 24, 23:57 UTCJul 25, 00:40 UTC43m
2026-07-24 QXE2260 SFO → SNA Jul 24, 23:55 UTCJul 25, 00:35 UTC40m
2026-07-24 QXE2176 AKN → ANC Jul 24, 21:35 UTCJul 24, 22:20 UTC45m
2026-07-24 QXE2317 PAE → SFO Jul 24, 18:25 UTCJul 24, 20:25 UTC2h 0m
2026-07-24 QXE2002 PSP → SFO Jul 24, 16:00 UTCJul 24, 16:50 UTC50m
2026-07-24 QXE2009 PHX → SFO Jul 24, 03:15 UTCJul 24, 03:50 UTC35m
2026-07-23 QXE2286 PDX → SEA Jul 23, 23:45 UTCJul 24, 01:00 UTC1h 15m
2026-07-23 QXE2287 LAX → SFO Jul 23, 21:35 UTCJul 23, 22:55 UTC1h 20m
2026-07-23 QXE2287 LAX → SFO Jul 23, 21:32 UTCJul 23, 22:51 UTC1h 19m
2026-07-23 QXE2276 LAX → SFO Jul 23, 18:25 UTCJul 23, 20:00 UTC1h 35m
2026-07-23 QXE2271 SEA → OAK Jul 23, 15:55 UTCJul 23, 17:15 UTC1h 20m
2026-07-23 QXE2165 ANC → BET Jul 23, 13:30 UTCJul 23, 14:05 UTC35m
2026-07-23 QXE2165 ANC → BET Jul 23, 13:39 UTCJul 23, 13:55 UTC16m
2026-07-23 QXE2417 SEA → OAK Jul 23, 05:30 UTCJul 23, 06:00 UTC30m
2026-07-23 QXE2138 SFO → PAE Jul 23, 02:35 UTCJul 23, 03:40 UTC1h 5m
2026-07-23 QXE2123 SJC → SEA Jul 23, 00:25 UTCJul 23, 01:10 UTC45m
2026-07-22 QXE2014 SBP → PDX Jul 22, 22:30 UTCJul 22, 23:00 UTC30m
2026-07-22 QXE2005 MRY → SEA Jul 22, 20:35 UTCJul 22, 21:05 UTC30m
2026-07-22 QXE2005 MRY → SEA Jul 22, 20:34 UTCJul 22, 20:55 UTC21m
2026-07-22 QXE2069 SFO → PDX Jul 22, 16:22 UTCJul 22, 17:05 UTC43m
2026-07-22 QXE2069 SFO → PDX Jul 22, 16:25 UTCJul 22, 17:15 UTC50m
2026-07-22 QXE2135 PAE → LAX Jul 22, 14:30 UTCJul 22, 15:10 UTC40m
2026-07-22 QXE2227 PDX → SEA Jul 22, 12:30 UTCJul 22, 12:55 UTC25m
2026-07-22 QXE2066 SBP → SEA Jul 22, 03:00 UTCJul 22, 05:00 UTC2h 0m
2026-07-22 QXE2064 PDX → SEA Jul 22, 00:10 UTCJul 22, 02:10 UTC2h 0m
2026-07-22 QXE2064 PDX → SEA Jul 22, 00:05 UTCJul 22, 02:10 UTC2h 5m
2026-07-21 QXE2275 SJC → PDX Jul 21, 22:10 UTCJul 21, 22:40 UTC30m
2026-07-21 QXE2275 SJC → PDX Jul 21, 22:00 UTCJul 21, 22:29 UTC29m
2026-07-21 QXE2155 - Jul 21, 20:35 UTCJul 21, 20:50 UTC15m
2026-07-21 QXE2155 SEA → EAT Jul 21, 20:30 UTCJul 21, 20:54 UTC24m
2026-07-21 QXE2241 PAE → SFO Jul 21, 18:43 UTCJul 21, 19:08 UTC25m
2026-07-21 QXE2048 PDX → SFO Jul 21, 17:10 UTCJul 21, 17:35 UTC25m

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 N627QX page for operator, model, and routing details .

Mode-S A831B2 frequently asked

What is Mode-S code A831B2?
A831B2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N627QX.
Where is Mode-S A831B2 registered?
Mode-S code A831B2 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 A831B2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A831B2, octal 52030662, decimal 11,022,770.
What flights does A831B2 operate?
Mode-S A831B2 has broadcast 20 distinct callsigns, including QXE2175, QXE2187, QXE2180, QXE2102, QXE2443.