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sensors Mode-S transponder

A59D63

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N461AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A59D63
Octal
51316543
Decimal
10,853,731
Country
US
Tail
N461AS
Type
B739
No current signal · last broadcast 1h ago
Flights observed
402
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A59D63.

Country allocation

The ICAO 24-bit address A59D63 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
ASA94 Alaska Airlines 8 2026-06-14
ASA616 - 6 2026-07-03
ASA333 - 5 2026-07-03
ASA1423 Alaska Airlines 5 2026-05-11
ASA1331 - 5 2026-07-03
ASA626 - 4 2026-06-15
ASA542 - 4 2026-04-14
ASA536 Alaska Airlines 4 2026-05-31
ASA365 Alaska Airlines 4 2026-05-10
ASA20 Alaska Airlines 4 2026-06-05
ASA18 Alaska Airlines 4 2026-05-19
ASA1457 - 4 2026-06-23
ASA1360 - 4 2026-06-30
ASA9823 - 3 2026-04-17
ASA785 - 3 2026-06-17
ASA688 Alaska Airlines 3 2026-06-05
ASA603 - 3 2026-06-19
ASA581 Alaska Airlines 3 2026-04-27
ASA568 - 3 2026-06-21
ASA555 - 3 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA1388 - Jul 14, 01:20 UTCJul 14, 02:45 UTC1h 25m
2026-07-13 ASA555 MSP → SEA Jul 13, 20:20 UTCJul 13, 23:35 UTC3h 15m
2026-07-13 ASA555 SEA → MSP Jul 13, 15:50 UTCJul 13, 18:40 UTC2h 50m
2026-07-13 ASA75 ANC → SEA Jul 13, 11:37 UTCJul 13, 14:10 UTC2h 33m
2026-07-13 ASA75 - Jul 13, 11:20 UTCJul 13, 14:20 UTC3h 0m
2026-07-13 ASA669 - Jul 13, 06:20 UTCJul 13, 09:25 UTC3h 5m
2026-07-12 ASA469 BNA → SEA Jul 12, 23:30 UTCJul 13, 03:45 UTC4h 15m
2026-07-12 ASA1376 PDX → BNA Jul 12, 17:45 UTCJul 12, 21:40 UTC3h 55m
2026-07-11 ASA646 DFW → PDX Jul 11, 22:55 UTCJul 12, 02:20 UTC3h 25m
2026-07-11 ASA392 PDX → DFW Jul 11, 18:15 UTCJul 11, 21:45 UTC3h 30m
2026-07-11 ASA413 - Jul 11, 12:55 UTCJul 11, 16:45 UTC3h 50m
2026-07-11 ASA328 SEA → ORD Jul 11, 07:25 UTCJul 11, 10:55 UTC3h 30m
2026-07-11 ASA550 DFW → SEA Jul 11, 02:00 UTCJul 11, 05:45 UTC3h 45m
2026-07-10 ASA380 SEA → MSP Jul 10, 21:50 UTCJul 11, 00:25 UTC2h 35m
2026-07-10 ASA1394 PDX → SAN Jul 10, 18:05 UTCJul 10, 20:15 UTC2h 10m
2026-07-10 ASA679 SJC → PDX Jul 10, 15:10 UTCJul 10, 16:30 UTC1h 20m
2026-07-10 ASA678 PDX → SJC Jul 10, 05:00 UTCJul 10, 06:30 UTC1h 30m
2026-07-10 ASA1807 DEN → PDX Jul 10, 01:25 UTCJul 10, 03:40 UTC2h 15m
2026-07-10 ASA1807 DEN → PDX Jul 10, 01:24 UTCJul 10, 03:40 UTC2h 16m
2026-07-09 ASA1809 PDX → DEN Jul 9, 21:45 UTCJul 9, 23:50 UTC2h 5m
2026-07-09 ASA1467 LAS → PDX Jul 9, 18:30 UTCJul 9, 20:00 UTC1h 30m
2026-07-09 ASA1467 LAS → PDX Jul 9, 18:10 UTCJul 9, 20:00 UTC1h 50m
2026-07-09 ASA627 PDX → LAS Jul 9, 14:55 UTCJul 9, 16:40 UTC1h 45m
2026-07-09 ASA1609 ANC → PDX Jul 9, 01:00 UTCJul 9, 04:00 UTC3h 0m
2026-07-08 ASA657 SEA → ANC Jul 8, 19:55 UTCJul 8, 23:25 UTC3h 30m
2026-07-08 ASA657 - Jul 8, 19:46 UTCJul 8, 23:11 UTC3h 25m
2026-07-08 ASA215 AUS → SEA Jul 8, 13:45 UTCJul 8, 17:35 UTC3h 50m
2026-07-08 ASA1370 PDX → AUS Jul 8, 01:05 UTCJul 8, 04:35 UTC3h 30m
2026-07-07 ASA267 ANC → PDX Jul 7, 20:10 UTCJul 7, 23:30 UTC3h 20m
2026-07-07 ASA1541 MSP → ANC Jul 7, 13:15 UTCJul 7, 18:30 UTC5h 15m
2026-07-07 ASA1541 MSP → ANC Jul 7, 13:12 UTCJul 7, 18:22 UTC5h 10m
2026-07-07 ASA1540 ANC → MSP Jul 7, 05:55 UTCJul 7, 11:00 UTC5h 5m
2026-07-07 ASA271 PDX → ANC Jul 7, 01:20 UTCJul 7, 04:30 UTC3h 10m
2026-07-06 ASA325 ORD → PDX Jul 6, 19:35 UTCJul 6, 23:20 UTC3h 45m
2026-07-06 ASA324 PDX → ORD Jul 6, 14:15 UTCJul 6, 18:15 UTC4h 0m
2026-07-06 ASA324 PDX → ORD Jul 6, 14:13 UTCJul 6, 17:30 UTC3h 17m
2026-07-06 ASA1807 DEN → PDX Jul 6, 02:10 UTCJul 6, 04:25 UTC2h 15m
2026-07-05 ASA1809 PDX → DEN Jul 5, 21:50 UTCJul 5, 23:50 UTC2h 0m
2026-07-05 ASA1467 LAS → PDX Jul 5, 18:15 UTCJul 5, 20:00 UTC1h 45m
2026-07-05 ASA627 PDX → LAS Jul 5, 14:50 UTCJul 5, 16:35 UTC1h 45m
2026-07-05 ASA1520 - Jul 5, 08:45 UTCJul 5, 12:05 UTC3h 20m
2026-07-05 ASA1880 - Jul 5, 03:30 UTCJul 5, 06:45 UTC3h 15m
2026-07-04 ASA402 ANC → SEA Jul 4, 21:10 UTCJul 5, 00:05 UTC2h 55m
2026-07-04 ASA53 - Jul 4, 14:40 UTCJul 4, 19:35 UTC4h 55m
2026-07-03 ASA333 - Jul 3, 22:25 UTCJul 4, 04:00 UTC5h 35m
2026-07-03 ASA1331 - Jul 3, 15:45 UTCJul 3, 20:25 UTC4h 40m
2026-07-03 ASA1331 LIR → LAX Jul 3, 15:07 UTCJul 3, 20:22 UTC5h 15m
2026-07-03 ASA616 - Jul 3, 07:15 UTCJul 3, 11:50 UTC4h 35m
2026-07-03 ASA616 LAX → LIR Jul 3, 07:10 UTCJul 3, 12:20 UTC5h 10m
2026-07-03 ASA333 - Jul 3, 02:35 UTCJul 3, 04:00 UTC1h 25m

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 N461AS page for operator, model, and routing details .

Mode-S A59D63 frequently asked

What is Mode-S code A59D63?
A59D63 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N461AS.
Where is Mode-S A59D63 registered?
Mode-S code A59D63 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 A59D63 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 A59D63, octal 51316543, decimal 10,853,731.
What flights does A59D63 operate?
Mode-S A59D63 has broadcast 20 distinct callsigns, including ASA94, ASA616, ASA333, ASA1423, ASA1331.