Apparatus

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sensors Mode-S transponder

A6A300

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N527AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A6A300
Octal
51521400
Decimal
10,920,704
Country
US
Tail
N527AS
Type
B738
Broadcasting now · callsign ASA1449 · 850 ft
Flights observed
329
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Current position

A6A300 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6A300 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
ASA702 Alaska Airlines 6 2026-07-26
ASA1603 Alaska Airlines 6 2026-07-23
ASA760 Alaska Airlines 5 2026-07-18
ASA7 Alaska Airlines 5 2026-07-23
ASA699 - 5 2026-07-12
ASA658 Alaska Airlines 5 2026-07-26
ASA472 Alaska Airlines 5 2026-07-25
ASA1563 Alaska Airlines 5 2026-07-23
ASA88 - 4 2026-07-21
ASA8 Alaska Airlines 4 2026-07-23
ASA430 - 4 2026-07-18
ASA305 Alaska Airlines 4 2026-06-03
ASA224 - 4 2026-07-04
ASA1637 - 4 2026-06-29
ASA1405 - 4 2026-07-12
ASA1357 Alaska Airlines 4 2026-07-18
ASA1338 Alaska Airlines 4 2026-07-24
ASA89 - 3 2026-07-20
ASA712 - 3 2026-07-17
ASA660 Alaska Airlines 3 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA658 SEA → PHX Jul 26, 20:15 UTCJul 26, 21:45 UTC1h 30m
2026-07-26 ASA702 LAX → LAS Jul 26, 16:10 UTCJul 26, 18:20 UTC2h 10m
2026-07-26 ASA631 LAS → SFO Jul 26, 02:35 UTCJul 26, 05:00 UTC2h 25m
2026-07-26 ASA631 LAS → SFO Jul 26, 02:32 UTCJul 26, 04:58 UTC2h 26m
2026-07-25 ASA698 SEA → PHX Jul 25, 22:30 UTCJul 26, 00:30 UTC2h 0m
2026-07-25 ASA698 SEA → PHX Jul 25, 22:42 UTCJul 26, 00:16 UTC1h 34m
2026-07-25 ASA738 LAS → SEA Jul 25, 18:50 UTCJul 25, 21:00 UTC2h 10m
2026-07-25 ASA702 LAX → LAS Jul 25, 17:25 UTCJul 25, 17:30 UTC5m
2026-07-25 ASA702 LAX → LAS Jul 25, 15:10 UTCJul 25, 17:30 UTC2h 20m
2026-07-25 ASA702 LAX → LAS Jul 25, 15:05 UTCJul 25, 17:08 UTC2h 3m
2026-07-25 ASA472 SEA → STL Jul 25, 00:50 UTCJul 25, 03:15 UTC2h 25m
2026-07-25 ASA472 SEA → STL Jul 25, 00:48 UTCJul 25, 03:14 UTC2h 26m
2026-07-24 ASA1338 LAS → SJD Jul 24, 14:45 UTCJul 24, 22:35 UTC7h 50m
2026-07-23 ASA7 JFK → SEA Jul 23, 23:55 UTCJul 24, 05:20 UTC5h 25m
2026-07-23 ASA8 SEA → EWR Jul 23, 16:55 UTCJul 23, 21:30 UTC4h 35m
2026-07-23 ASA1603 LAX → SFO Jul 23, 14:40 UTCJul 23, 15:35 UTC55m
2026-07-23 ASA1603 LAX → SFO Jul 23, 14:38 UTCJul 23, 15:27 UTC49m
2026-07-23 ASA1563 ANC → LAX Jul 23, 07:55 UTCJul 23, 12:50 UTC4h 55m
2026-07-23 ASA1613 JNU → ANC Jul 23, 03:05 UTCJul 23, 04:30 UTC1h 25m
2026-07-23 ASA1537 SEA → MSO Jul 23, 00:45 UTCJul 23, 01:50 UTC1h 5m
2026-07-22 ASA83 SEA → ANC Jul 22, 19:55 UTCJul 22, 23:10 UTC3h 15m
2026-07-22 ASA702 LAX → LAS Jul 22, 15:20 UTCJul 22, 17:30 UTC2h 10m
2026-07-22 ASA472 SEA → STL Jul 22, 00:30 UTCJul 22, 03:05 UTC2h 35m
2026-07-21 ASA1311 SEA → SFO Jul 21, 17:25 UTCJul 21, 19:00 UTC1h 35m
2026-07-21 ASA1311 SEA → SFO Jul 21, 17:21 UTCJul 21, 18:49 UTC1h 28m
2026-07-21 ASA1448 SJC → PVR Jul 21, 14:35 UTCJul 21, 16:00 UTC1h 25m
2026-07-21 ASA1448 SJC → PVR Jul 21, 14:15 UTCJul 21, 16:00 UTC1h 45m
2026-07-21 ASA1518 SAN → ORD Jul 21, 02:50 UTCJul 21, 06:05 UTC3h 15m
2026-07-21 ASA88 - Jul 21, 00:50 UTCJul 21, 01:40 UTC50m
2026-07-20 ASA89 ANC → ADQ Jul 20, 22:55 UTCJul 20, 23:40 UTC45m
2026-07-20 ASA9660 ANC → ANC Jul 20, 17:20 UTCJul 20, 21:15 UTC3h 55m
2026-07-20 ASA1339 CUN → LAX Jul 20, 14:20 UTCJul 20, 15:10 UTC50m
2026-07-20 ASA1521 SAN → ORD Jul 20, 05:25 UTCJul 20, 08:50 UTC3h 25m
2026-07-20 ASA1421 SNA → SEA Jul 20, 00:00 UTCJul 20, 03:50 UTC3h 50m
2026-07-19 ASA438 SEA → IAH Jul 19, 18:45 UTCJul 19, 22:40 UTC3h 55m
2026-07-19 ASA795 DEN → PDX Jul 19, 15:00 UTCJul 19, 16:15 UTC1h 15m
2026-07-19 ASA638 SEA → TUS Jul 19, 02:35 UTCJul 19, 04:05 UTC1h 30m
2026-07-18 ASA760 SNA → SEA Jul 18, 22:05 UTCJul 19, 00:10 UTC2h 5m
2026-07-18 ASA1357 PVR → SFO Jul 18, 18:25 UTCJul 18, 20:50 UTC2h 25m
2026-07-18 ASA1325 - Jul 18, 14:05 UTCJul 18, 16:15 UTC2h 10m
2026-07-18 ASA631 LAS → SFO Jul 18, 02:50 UTCJul 18, 05:15 UTC2h 25m
2026-07-18 ASA430 PDX → SEA Jul 18, 00:55 UTCJul 18, 01:30 UTC35m
2026-07-18 ASA430 PDX → SEA Jul 18, 01:00 UTCJul 18, 01:22 UTC22m
2026-07-17 ASA712 - Jul 17, 21:20 UTCJul 17, 23:14 UTC1h 55m
2026-07-17 ASA588 - Jul 17, 18:00 UTCJul 17, 20:15 UTC2h 15m
2026-07-17 ASA588 PDX → SNA Jul 17, 17:58 UTCJul 17, 20:08 UTC2h 10m
2026-07-17 ASA750 - Jul 17, 14:15 UTCJul 17, 16:10 UTC1h 55m
2026-07-17 ASA518 - Jul 17, 03:05 UTCJul 17, 05:10 UTC2h 5m
2026-07-16 ASA1369 - Jul 16, 20:49 UTCJul 17, 01:49 UTC5h 0m
2026-07-16 ASA374 - Jul 16, 14:50 UTCJul 16, 19:25 UTC4h 35m

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 N527AS page for operator, model, and routing details .

Mode-S A6A300 frequently asked

What is Mode-S code A6A300?
A6A300 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N527AS.
Where is Mode-S A6A300 registered?
Mode-S code A6A300 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 A6A300 broadcasting right now?
Yes. Mode-S A6A300 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6A300, octal 51521400, decimal 10,920,704.
What flights does A6A300 operate?
Mode-S A6A300 has broadcast 20 distinct callsigns, including ASA702, ASA1603, ASA760, ASA7, ASA699.