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
No current signal · last broadcast 1h ago
Flights observed
272
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A6A300.

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
ASA699 - 5 2026-07-12
ASA760 - 4 2026-06-18
ASA7 - 4 2026-06-29
ASA658 - 4 2026-06-28
ASA305 Alaska Airlines 4 2026-06-03
ASA224 - 4 2026-07-04
ASA1637 - 4 2026-06-29
ASA1603 Alaska Airlines 4 2026-06-29
ASA1563 - 4 2026-06-29
ASA1405 - 4 2026-07-12
ASA88 - 3 2026-07-03
ASA8 Alaska Airlines 3 2026-06-29
ASA660 Alaska Airlines 3 2026-05-29
ASA650 - 3 2026-07-10
ASA573 - 3 2026-06-19
ASA534 - 3 2026-07-07
ASA455 - 3 2026-07-08
ASA431 - 3 2026-07-04
ASA248 Alaska Airlines 3 2026-06-10
ASA226 Alaska Airlines 3 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASA515 - Jul 13, 22:00 UTCJul 14, 00:40 UTC2h 40m
2026-07-13 ASA514 PHX → PAE Jul 13, 18:15 UTCJul 13, 20:23 UTC2h 8m
2026-07-13 ASA514 PHX → PAE Jul 13, 18:00 UTCJul 13, 20:25 UTC2h 25m
2026-07-13 ASA1349 PDX → PHX Jul 13, 14:05 UTCJul 13, 16:30 UTC2h 25m
2026-07-13 ASA1520 - Jul 13, 08:55 UTCJul 13, 12:25 UTC3h 30m
2026-07-13 ASA1880 SEA → FAI Jul 13, 04:35 UTCJul 13, 07:45 UTC3h 10m
2026-07-13 ASA296 - Jul 13, 01:40 UTCJul 13, 02:40 UTC1h 0m
2026-07-12 ASA342 - Jul 12, 22:10 UTCJul 12, 23:05 UTC55m
2026-07-12 ASA1405 - Jul 12, 18:10 UTCJul 12, 19:55 UTC1h 45m
2026-07-12 ASA699 - Jul 12, 13:55 UTCJul 12, 16:25 UTC2h 30m
2026-07-11 ASA31 JFK → SEA Jul 11, 21:30 UTCJul 12, 03:05 UTC5h 35m
2026-07-11 ASA26 SEA → JFK Jul 11, 14:15 UTCJul 11, 19:05 UTC4h 50m
2026-07-10 ASA3 DCA → SEA Jul 10, 21:20 UTCJul 11, 02:35 UTC5h 15m
2026-07-10 ASA10 - Jul 10, 15:00 UTCJul 10, 19:45 UTC4h 45m
2026-07-10 ASA650 PHX → PDX Jul 10, 05:00 UTCJul 10, 07:15 UTC2h 15m
2026-07-10 ASA744 SEA → PHX Jul 10, 01:35 UTCJul 10, 03:55 UTC2h 20m
2026-07-09 ASA293 GEG → SEA Jul 9, 22:05 UTCJul 9, 22:45 UTC40m
2026-07-09 ASA449 SEA → GEG Jul 9, 20:20 UTCJul 9, 20:55 UTC35m
2026-07-09 ASA449 SEA → GEG Jul 9, 20:18 UTCJul 9, 20:53 UTC35m
2026-07-09 ASA47 ORD → ANC Jul 9, 15:15 UTCJul 9, 18:15 UTC3h 0m
2026-07-09 ASA47 ORD → ANC Jul 9, 15:12 UTCJul 9, 18:00 UTC2h 48m
2026-07-09 ASA1363 SEA → ANC Jul 9, 07:25 UTCJul 9, 10:40 UTC3h 15m
2026-07-09 ASA371 GEG → SEA Jul 9, 03:15 UTCJul 9, 04:00 UTC45m
2026-07-09 ASA1433 SEA → GEG Jul 9, 01:53 UTCJul 9, 02:08 UTC15m
2026-07-09 ASA1433 SEA → GEG Jul 9, 01:35 UTCJul 9, 02:15 UTC40m
2026-07-08 ASA1338 - Jul 8, 20:20 UTCJul 8, 22:00 UTC1h 40m
2026-07-08 ASA1338 SJD → SEA Jul 8, 18:57 UTCJul 8, 22:38 UTC3h 41m
2026-07-08 ASA455 - Jul 8, 15:05 UTCJul 8, 16:25 UTC1h 20m
2026-07-08 ASA455 SFO → SJD Jul 8, 15:19 UTCJul 8, 17:40 UTC2h 21m
2026-07-08 ASA1601 LAX → SFO Jul 8, 04:30 UTCJul 8, 05:25 UTC55m
2026-07-07 ASA534 - Jul 7, 23:25 UTCJul 7, 23:50 UTC25m
2026-07-07 ASA534 PVR → LAX Jul 7, 22:19 UTCJul 8, 00:55 UTC2h 36m
2026-07-07 ASA437 - Jul 7, 18:25 UTCJul 7, 19:40 UTC1h 15m
2026-07-07 ASA437 LAX → PVR Jul 7, 18:17 UTCJul 7, 20:59 UTC2h 42m
2026-07-07 ASA1611 GEG → LAX Jul 7, 13:35 UTCJul 7, 15:50 UTC2h 15m
2026-07-07 ASA1356 - Jul 7, 05:05 UTCJul 7, 05:50 UTC45m
2026-07-06 ASA1396 AUS → PDX Jul 6, 23:10 UTCJul 7, 02:50 UTC3h 40m
2026-07-06 ASA540 PDX → AUS Jul 6, 18:00 UTCJul 6, 21:45 UTC3h 45m
2026-07-06 ASA1641 RNO → PDX Jul 6, 15:15 UTCJul 6, 16:20 UTC1h 5m
2026-07-06 ASA1641 RNO → PDX Jul 6, 15:24 UTCJul 6, 16:22 UTC58m
2026-07-06 ASA1616 PDX → RNO Jul 6, 01:10 UTCJul 6, 02:25 UTC1h 15m
2026-07-05 ASA1383 BUR → PDX Jul 5, 21:40 UTCJul 5, 23:30 UTC1h 50m
2026-07-05 ASA1384 PDX → BUR Jul 5, 18:30 UTCJul 5, 20:25 UTC1h 55m
2026-07-05 ASA668 - Jul 5, 14:10 UTCJul 5, 16:05 UTC1h 55m
2026-07-05 ASA1523 - Jul 5, 03:35 UTCJul 5, 04:30 UTC55m
2026-07-04 ASA236 PDX → SFO Jul 4, 21:55 UTCJul 4, 23:20 UTC1h 25m
2026-07-04 ASA1567 ANC → PDX Jul 4, 17:10 UTCJul 4, 20:25 UTC3h 15m
2026-07-04 ASA224 - Jul 4, 15:00 UTCJul 4, 15:40 UTC40m
2026-07-04 ASA431 ANC → ADQ Jul 4, 02:30 UTCJul 4, 03:15 UTC45m
2026-07-03 ASA1565 PDX → ANC Jul 3, 21:45 UTCJul 4, 01:00 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 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?
No active broadcast right now. Last signal was 1h ago.
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 ASA699, ASA760, ASA7, ASA658, ASA305.