Apparatus

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sensors Mode-S transponder

A61F05

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N494AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A61F05
Octal
51417405
Decimal
10,886,917
Country
US
Tail
N494AS
Type
B739
No current signal · last broadcast 8h ago
Flights observed
415
Distinct callsigns
20
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A61F05.

Country allocation

The ICAO 24-bit address A61F05 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
ASA270 - 7 2026-06-16
ASA742 - 6 2026-07-04
ASA698 - 6 2026-07-06
ASA401 - 6 2026-06-23
ASA305 Alaska Airlines 6 2026-04-16
ASA253 Alaska Airlines 6 2026-06-09
ASA252 Alaska Airlines 6 2026-06-09
ASA210 Alaska Airlines 5 2026-05-20
ASA21 Alaska Airlines 5 2026-06-13
ASA777 - 4 2026-07-02
ASA738 Alaska Airlines 4 2026-07-06
ASA528 - 4 2026-07-08
ASA503 Alaska Airlines 4 2026-07-01
ASA462 Alaska Airlines 4 2026-04-14
ASA449 Alaska Airlines 4 2026-05-16
ASA1380 Alaska Airlines 4 2026-06-04
ASA1305 - 4 2026-07-11
ASA1303 Alaska Airlines 4 2026-05-23
ASA782 Alaska Airlines 3 2026-04-17
ASA607 Alaska Airlines 3 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASA487 SEA → LAX Jul 13, 19:30 UTCJul 13, 21:55 UTC2h 25m
2026-07-13 ASA640 TPA → SEA Jul 13, 12:15 UTCJul 13, 17:25 UTC5h 10m
2026-07-13 ASA639 SEA → TPA Jul 13, 05:15 UTCJul 13, 10:10 UTC4h 55m
2026-07-13 ASA1413 SJC → SEA Jul 13, 01:15 UTCJul 13, 02:45 UTC1h 30m
2026-07-12 ASA1366 SEA → SJC Jul 12, 21:45 UTCJul 12, 23:35 UTC1h 50m
2026-07-12 ASA720 BUR → SEA Jul 12, 17:20 UTCJul 12, 19:10 UTC1h 50m
2026-07-12 ASA488 SEA → BUR Jul 12, 13:45 UTCJul 12, 16:05 UTC2h 20m
2026-07-12 ASA1509 FAI → SEA Jul 12, 08:20 UTCJul 12, 11:35 UTC3h 15m
2026-07-12 ASA284 - Jul 12, 01:15 UTCJul 12, 03:15 UTC2h 0m
2026-07-12 ASA284 SEA → FAI Jul 12, 01:15 UTCJul 12, 04:28 UTC3h 13m
2026-07-11 ASA1305 - Jul 11, 21:35 UTCJul 11, 23:15 UTC1h 40m
2026-07-11 ASA1305 LAX → SEA Jul 11, 21:31 UTCJul 11, 23:22 UTC1h 51m
2026-07-11 ASA1602 SFO → LAX Jul 11, 17:35 UTCJul 11, 18:35 UTC1h 0m
2026-07-11 ASA526 PDX → SFO Jul 11, 14:30 UTCJul 11, 16:05 UTC1h 35m
2026-07-11 ASA526 PDX → SFO Jul 11, 14:28 UTCJul 11, 15:57 UTC1h 29m
2026-07-11 ASA710 GEG → PDX Jul 11, 12:15 UTCJul 11, 13:05 UTC50m
2026-07-11 ASA566 SAN → GEG Jul 11, 03:30 UTCJul 11, 05:40 UTC2h 10m
2026-07-10 ASA1638 TPA → SAN Jul 10, 21:45 UTCJul 11, 02:00 UTC4h 15m
2026-07-10 ASA1639 SAN → TPA Jul 10, 16:00 UTCJul 10, 20:30 UTC4h 30m
2026-07-09 ASA474 RDU → SAN Jul 9, 23:30 UTCJul 10, 03:55 UTC4h 25m
2026-07-09 ASA434 - Jul 9, 17:05 UTCJul 9, 21:30 UTC4h 25m
2026-07-09 ASA1623 SJC → SAN Jul 9, 14:25 UTCJul 9, 15:30 UTC1h 5m
2026-07-09 ASA678 PDX → SJC Jul 9, 04:40 UTCJul 9, 06:05 UTC1h 25m
2026-07-09 ASA649 BUR → PDX Jul 9, 01:25 UTCJul 9, 03:15 UTC1h 50m
2026-07-08 ASA1386 PDX → BUR Jul 8, 22:15 UTCJul 9, 00:05 UTC1h 50m
2026-07-08 ASA235 - Jul 8, 19:55 UTCJul 8, 21:10 UTC1h 15m
2026-07-08 ASA528 SEA → SFO Jul 8, 17:00 UTCJul 8, 18:45 UTC1h 45m
2026-07-08 ASA643 DEN → SEA Jul 8, 12:15 UTCJul 8, 14:45 UTC2h 30m
2026-07-08 ASA1619 SAN → DEN Jul 8, 03:20 UTCJul 8, 05:10 UTC1h 50m
2026-07-07 ASA1638 TPA → SAN Jul 7, 21:45 UTCJul 8, 02:05 UTC4h 20m
2026-07-07 ASA1639 SAN → TPA Jul 7, 15:40 UTCJul 7, 19:55 UTC4h 15m
2026-07-07 ASA1617 DEN → SAN Jul 7, 12:05 UTCJul 7, 14:00 UTC1h 55m
2026-07-07 ASA310 SEA → DEN Jul 7, 02:45 UTCJul 7, 04:55 UTC2h 10m
2026-07-06 ASA698 LAS → SEA Jul 6, 23:09 UTCJul 7, 00:53 UTC1h 44m
2026-07-06 ASA698 LAS → SEA Jul 6, 23:00 UTCJul 7, 01:00 UTC2h 0m
2026-07-06 ASA738 LAS → SEA Jul 6, 19:33 UTCJul 6, 21:27 UTC1h 54m
2026-07-06 ASA738 LAS → SEA Jul 6, 19:35 UTCJul 6, 21:40 UTC2h 5m
2026-07-06 ASA1533 - Jul 6, 15:20 UTCJul 6, 17:35 UTC2h 15m
2026-07-06 ASA1559 SEA → JNU Jul 6, 03:05 UTCJul 6, 05:05 UTC2h 0m
2026-07-05 ASA698 LAS → SEA Jul 5, 22:42 UTCJul 6, 00:28 UTC1h 46m
2026-07-05 ASA698 LAS → SEA Jul 5, 22:35 UTCJul 6, 00:35 UTC2h 0m
2026-07-05 ASA738 LAS → SEA Jul 5, 19:00 UTCJul 5, 21:05 UTC2h 5m
2026-07-05 ASA479 LAS → SEA Jul 5, 14:30 UTCJul 5, 16:35 UTC2h 5m
2026-07-05 ASA531 PDX → LAS Jul 5, 01:05 UTCJul 5, 02:55 UTC1h 50m
2026-07-04 ASA742 PHX → PDX Jul 4, 21:20 UTCJul 4, 23:40 UTC2h 20m
2026-07-04 ASA593 SEA → PHX Jul 4, 17:25 UTCJul 4, 19:40 UTC2h 15m
2026-07-04 ASA473 STL → SEA Jul 4, 11:05 UTCJul 4, 14:55 UTC3h 50m
2026-07-04 ASA615 SEA → STL Jul 4, 01:25 UTCJul 4, 05:00 UTC3h 35m
2026-07-03 ASA585 - Jul 3, 21:15 UTCJul 3, 23:40 UTC2h 25m
2026-07-03 ASA1367 SEA → LAX Jul 3, 17:35 UTCJul 3, 19:40 UTC2h 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 N494AS page for operator, model, and routing details .

Mode-S A61F05 frequently asked

What is Mode-S code A61F05?
A61F05 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N494AS.
Where is Mode-S A61F05 registered?
Mode-S code A61F05 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 A61F05 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A61F05, octal 51417405, decimal 10,886,917.
What flights does A61F05 operate?
Mode-S A61F05 has broadcast 20 distinct callsigns, including ASA270, ASA742, ASA698, ASA401, ASA305.