Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign ASA280 · 37,000 ft
Flights observed
453
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Current position

A59D63 is currently broadcasting. Map zoomed to live position.

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
2026-07-26 ASA731 SEA → SFO Jul 26, 22:40 UTCJul 26, 22:45 UTC5m
2026-07-26 ASA251 GEG → PDX Jul 26, 20:10 UTCJul 26, 21:00 UTC50m
2026-07-26 ASA250 PDX → GEG Jul 26, 18:15 UTCJul 26, 18:55 UTC40m
2026-07-26 ASA1410 SEA → SNA Jul 26, 14:35 UTCJul 26, 15:45 UTC1h 10m
2026-07-26 ASA634 LAS → SFO Jul 26, 05:00 UTCJul 26, 06:15 UTC1h 15m
2026-07-26 ASA1458 EWR → SFO Jul 26, 00:30 UTCJul 26, 02:35 UTC2h 5m
2026-07-25 ASA580 PSP → SEA Jul 25, 20:35 UTCJul 25, 22:35 UTC2h 0m
2026-07-25 ASA426 SEA → JFK Jul 25, 17:05 UTCJul 25, 19:15 UTC2h 10m
2026-07-25 ASA625 PHX → SEA Jul 25, 11:20 UTCJul 25, 15:35 UTC4h 15m
2026-07-25 ASA624 SEA → IND Jul 25, 05:55 UTCJul 25, 09:15 UTC3h 20m
2026-07-25 ASA417 PIT → SEA Jul 25, 01:10 UTCJul 25, 03:25 UTC2h 15m
2026-07-24 ASA1395 SJD → SAN Jul 24, 22:05 UTCJul 24, 23:05 UTC1h 0m
2026-07-24 ASA1414 SAN → SJD Jul 24, 18:20 UTCJul 24, 19:25 UTC1h 5m
2026-07-24 ASA1414 SAN → SJD Jul 24, 18:17 UTCJul 24, 20:12 UTC1h 55m
2026-07-24 ASA1557 SFO → SAN Jul 24, 15:30 UTCJul 24, 16:45 UTC1h 15m
2026-07-24 ASA1601 LAX → SFO Jul 24, 03:45 UTCJul 24, 04:55 UTC1h 10m
2026-07-24 ASA1523 LAX → SJO Jul 24, 00:40 UTCJul 24, 01:40 UTC1h 0m
2026-07-23 ASA680 SEA → SFO Jul 23, 21:00 UTCJul 23, 22:50 UTC1h 50m
2026-07-23 ASA680 SEA → SFO Jul 23, 20:57 UTCJul 23, 22:41 UTC1h 44m
2026-07-23 ASA1468 SEA → LAX Jul 23, 17:37 UTCJul 23, 18:49 UTC1h 12m
2026-07-23 ASA1468 SEA → LAX Jul 23, 17:40 UTCJul 23, 19:05 UTC1h 25m
2026-07-23 ASA682 SEA → DEN Jul 23, 14:45 UTCJul 23, 16:10 UTC1h 25m
2026-07-23 ASA532 LAX → PDX Jul 23, 01:20 UTCJul 23, 04:45 UTC3h 25m
2026-07-22 ASA527 SNA → SEA Jul 22, 21:15 UTCJul 23, 00:00 UTC2h 45m
2026-07-22 ASA765 - Jul 22, 16:10 UTCJul 22, 19:10 UTC3h 0m
2026-07-22 ASA667 SEA → RDM Jul 22, 04:20 UTCJul 22, 05:25 UTC1h 5m
2026-07-21 ASA391 SAN → PDX Jul 21, 21:20 UTCJul 22, 02:10 UTC4h 50m
2026-07-21 ASA385 BOS → SEA Jul 21, 19:25 UTCJul 21, 19:30 UTC5m
2026-07-21 ASA385 BOS → SEA Jul 21, 15:28 UTCJul 21, 19:08 UTC3h 40m
2026-07-21 ASA385 BOS → SEA Jul 21, 15:35 UTCJul 21, 19:30 UTC3h 55m
2026-07-21 ASA54 ANC → SEA Jul 21, 09:50 UTCJul 21, 13:00 UTC3h 10m
2026-07-21 ASA667 SEA → RDM Jul 21, 04:25 UTCJul 21, 07:20 UTC2h 55m
2026-07-21 ASA1413 GDL → LAX Jul 21, 01:05 UTCJul 21, 02:40 UTC1h 35m
2026-07-20 ASA1366 SEA → SJC Jul 20, 21:45 UTCJul 20, 23:35 UTC1h 50m
2026-07-20 ASA230 EWR → SEA Jul 20, 13:35 UTCJul 20, 19:10 UTC5h 35m
2026-07-20 ASA314 SEA → EWR Jul 20, 06:10 UTCJul 20, 10:30 UTC4h 20m
2026-07-19 ASA737 IAD → SEA Jul 19, 22:45 UTCJul 20, 04:00 UTC5h 15m
2026-07-19 ASA737 SEA → IAD Jul 19, 16:50 UTCJul 19, 21:05 UTC4h 15m
2026-07-17 ASA282 - Jul 17, 04:59 UTCJul 17, 06:29 UTC1h 30m
2026-07-17 ASA393 - Jul 17, 01:49 UTCJul 17, 03:34 UTC1h 45m
2026-07-16 ASA580 BUR → SEA Jul 16, 21:35 UTCJul 16, 23:44 UTC2h 10m
2026-07-16 ASA426 SEA → BUR Jul 16, 17:49 UTCJul 16, 20:08 UTC2h 19m
2026-07-16 ASA426 SEA → BUR Jul 16, 17:49 UTCJul 16, 20:09 UTC2h 20m
2026-07-15 ASA305 - Jul 15, 22:50 UTCJul 16, 04:30 UTC5h 40m
2026-07-15 ASA305 SEA → MIA Jul 15, 16:05 UTCJul 15, 21:30 UTC5h 25m
2026-07-14 ASA226 - Jul 14, 23:15 UTCJul 15, 02:20 UTC3h 5m
2026-07-14 ASA433 SEA → ANC Jul 14, 18:25 UTCJul 14, 21:45 UTC3h 20m
2026-07-14 ASA795 SMF → SEA Jul 14, 15:35 UTCJul 14, 16:50 UTC1h 15m
2026-07-14 ASA795 SMF → SEA Jul 14, 15:25 UTCJul 14, 16:42 UTC1h 17m
2026-07-14 ASA1621 - Jul 14, 05:20 UTCJul 14, 06:25 UTC1h 5m

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?
Yes. Mode-S A59D63 is currently airborne.
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.