Apparatus

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sensors Mode-S transponder

A5320B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N434AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A5320B
Octal
51231013
Decimal
10,826,251
Country
US
Tail
N434AS
Type
B739
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
454
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A5320B.

Country allocation

The ICAO 24-bit address A5320B 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
ASA683 - 5 2026-07-08
ASA304 Alaska Airlines 5 2026-05-02
ASA201 Alaska Airlines 5 2026-05-06
ASA748 - 4 2026-07-17
ASA695 Alaska Airlines 4 2026-06-27
ASA574 Alaska Airlines 4 2026-05-26
ASA506 Alaska Airlines 4 2026-05-06
ASA369 Alaska Airlines 4 2026-04-16
ASA365 Alaska Airlines 4 2026-06-14
ASA357 Alaska Airlines 4 2026-04-15
ASA353 Alaska Airlines 4 2026-05-29
ASA289 - 4 2026-07-12
ASA277 Alaska Airlines 4 2026-07-10
ASA1477 - 4 2026-07-07
ASA1315 - 4 2026-06-27
ASA786 Alaska Airlines 3 2026-06-10
ASA719 Alaska Airlines 3 2026-05-17
ASA718 - 3 2026-06-23
ASA700 - 3 2026-07-13
ASA649 Alaska Airlines 3 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA787 LAS → SEA Jul 26, 22:15 UTCJul 26, 22:45 UTC30m
2026-07-26 ASA787 LAS → SEA Jul 26, 16:05 UTCJul 26, 20:35 UTC4h 30m
2026-07-25 ASA246 SJC → PDX Jul 25, 21:15 UTCJul 25, 22:15 UTC1h 0m
2026-07-25 ASA202 SEA → SNA Jul 25, 02:30 UTCJul 25, 03:20 UTC50m
2026-07-24 ASA537 BOS → SEA Jul 24, 22:15 UTCJul 25, 00:15 UTC2h 0m
2026-07-24 ASA529 LAS → SFO Jul 24, 18:50 UTCJul 24, 21:00 UTC2h 10m
2026-07-24 ASA459 BOS → SEA Jul 24, 11:30 UTCJul 24, 17:20 UTC5h 50m
2026-07-24 ASA255 CLE → SEA Jul 24, 04:15 UTCJul 24, 09:15 UTC5h 0m
2026-07-23 ASA389 SAN → SJC Jul 23, 21:15 UTCJul 24, 03:00 UTC5h 45m
2026-07-23 ASA358 PDX → BOS Jul 23, 14:40 UTCJul 23, 19:25 UTC4h 45m
2026-07-23 ASA1457 LAS → PAE Jul 23, 05:45 UTCJul 23, 06:15 UTC30m
2026-07-23 ASA1457 LAS → PAE Jul 23, 05:44 UTCJul 23, 06:15 UTC31m
2026-07-23 ASA481 SEA → BZE Jul 23, 02:05 UTCJul 23, 03:29 UTC1h 24m
2026-07-23 ASA481 SEA → BZE Jul 23, 01:55 UTCJul 23, 03:40 UTC1h 45m
2026-07-22 ASA319 BOS → SFO Jul 22, 22:55 UTCJul 23, 00:45 UTC1h 50m
2026-07-22 ASA664 LAS → SEA Jul 22, 19:05 UTCJul 22, 20:35 UTC1h 30m
2026-07-22 ASA360 SJD → SFO Jul 22, 16:05 UTCJul 22, 17:40 UTC1h 35m
2026-07-22 ASA499 PDX → SEA Jul 22, 13:30 UTCJul 22, 13:55 UTC25m
2026-07-22 ASA779 LAS → PDX Jul 22, 01:35 UTCJul 22, 03:20 UTC1h 45m
2026-07-21 ASA776 LAS → SFO Jul 21, 23:15 UTCJul 22, 00:30 UTC1h 15m
2026-07-21 ASA9803 LAS → SFO Jul 21, 18:20 UTCJul 21, 20:10 UTC1h 50m
2026-07-21 ASA557 PDX → LAX Jul 21, 11:15 UTCJul 21, 14:15 UTC3h 0m
2026-07-21 ASA556 SFO → IAD Jul 21, 02:22 UTCJul 21, 04:55 UTC2h 33m
2026-07-21 ASA556 SFO → IAD Jul 21, 02:25 UTCJul 21, 05:00 UTC2h 35m
2026-07-20 ASA796 SJC → LAX Jul 20, 17:30 UTCJul 20, 19:05 UTC1h 35m
2026-07-20 ASA292 SFO → EWR Jul 20, 14:30 UTCJul 20, 16:05 UTC1h 35m
2026-07-20 ASA259 KOA → SEA Jul 20, 07:25 UTCJul 20, 12:35 UTC5h 10m
2026-07-20 ASA238 - Jul 20, 05:00 UTCJul 20, 05:20 UTC20m
2026-07-19 ASA238 - Jul 19, 23:45 UTCJul 20, 00:35 UTC50m
2026-07-19 ASA381 DTW → SEA Jul 19, 19:10 UTCJul 19, 21:30 UTC2h 20m
2026-07-19 ASA375 SEA → DEN Jul 19, 15:30 UTCJul 19, 17:35 UTC2h 5m
2026-07-19 ASA1333 PVR → PDX Jul 19, 03:35 UTCJul 19, 06:30 UTC2h 55m
2026-07-18 ASA318 SEA → SJC Jul 18, 22:05 UTCJul 19, 02:15 UTC4h 10m
2026-07-18 ASA321 SJC → SEA Jul 18, 16:30 UTCJul 18, 20:40 UTC4h 10m
2026-07-18 ASA39 JFK → SFO Jul 18, 03:10 UTCJul 18, 07:20 UTC4h 10m
2026-07-18 ASA373 SEA → SLC Jul 18, 00:15 UTCJul 18, 02:00 UTC1h 45m
2026-07-17 ASA384 SEA → BOS Jul 17, 21:10 UTCJul 17, 22:40 UTC1h 30m
2026-07-17 ASA383 SEA → FAT Jul 17, 17:58 UTCJul 17, 19:51 UTC1h 53m
2026-07-17 ASA383 - Jul 17, 18:00 UTCJul 17, 19:49 UTC1h 50m
2026-07-17 ASA748 - Jul 17, 14:20 UTCJul 17, 16:19 UTC2h 0m
2026-07-17 ASA1389 - Jul 17, 04:54 UTCJul 17, 07:00 UTC2h 5m
2026-07-16 ASA783 ATL → PDX Jul 16, 23:10 UTCJul 17, 03:30 UTC4h 20m
2026-07-16 ASA334 LAX → PDX Jul 16, 16:44 UTCJul 16, 21:10 UTC4h 25m
2026-07-16 ASA1409 SMF → SEA Jul 16, 13:20 UTCJul 16, 14:50 UTC1h 30m
2026-07-16 ASA447 - Jul 16, 02:30 UTCJul 16, 06:30 UTC4h 0m
2026-07-15 ASA448 - Jul 15, 20:40 UTCJul 15, 22:45 UTC2h 5m
2026-07-15 ASA448 SMF → ANC Jul 15, 20:39 UTCJul 16, 00:41 UTC4h 2m
2026-07-15 ASA1380 SEA → SMF Jul 15, 18:00 UTCJul 15, 19:30 UTC1h 30m
2026-07-15 ASA554 OKC → SEA Jul 15, 12:10 UTCJul 15, 15:20 UTC3h 10m
2026-07-15 ASA553 SEA → OKC Jul 15, 01:50 UTCJul 15, 05:05 UTC3h 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 N434AS page for operator, model, and routing details .

Mode-S A5320B frequently asked

What is Mode-S code A5320B?
A5320B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N434AS.
Where is Mode-S A5320B registered?
Mode-S code A5320B 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 A5320B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5320B, octal 51231013, decimal 10,826,251.
What flights does A5320B operate?
Mode-S A5320B has broadcast 20 distinct callsigns, including ASA683, ASA304, ASA201, ASA748, ASA695.