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 Jul 26, 19:55 UTC
Flights observed
469
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:55 UTC

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
ASA200 Alaska Airlines 4 2026-07-20
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1618 SAN → DEN Jul 26, 17:50 UTCJul 26, 19:45 UTC1h 55m
2026-07-26 ASA1618 SAN → DEN Jul 26, 14:35 UTCJul 26, 16:30 UTC1h 55m
2026-07-26 ASA217 SJC → SEA Jul 26, 00:35 UTCJul 26, 05:10 UTC4h 35m
2026-07-25 ASA506 SEA → BOS Jul 25, 18:55 UTCJul 25, 23:25 UTC4h 30m
2026-07-25 ASA506 SEA → BOS Jul 25, 18:51 UTCJul 25, 23:15 UTC4h 24m
2026-07-25 ASA1557 SFO → SAN Jul 25, 16:10 UTCJul 25, 17:25 UTC1h 15m
2026-07-25 ASA404 SEA → ORD Jul 25, 06:40 UTCJul 25, 07:30 UTC50m
2026-07-25 ASA404 SEA → ORD Jul 25, 03:00 UTCJul 25, 03:10 UTC10m
2026-07-25 ASA204 LAX → SFO Jul 25, 01:25 UTCJul 25, 01:45 UTC20m
2026-07-24 ASA204 LAX → SFO Jul 24, 20:15 UTCJul 24, 21:00 UTC45m
2026-07-24 ASA795 DEN → PDX Jul 24, 16:45 UTCJul 24, 18:10 UTC1h 25m
2026-07-24 ASA638 SEA → TUS Jul 24, 03:45 UTCJul 24, 05:05 UTC1h 20m
2026-07-23 ASA1574 DFW → SEA Jul 23, 21:55 UTCJul 24, 01:35 UTC3h 40m
2026-07-23 ASA545 SAN → DFW Jul 23, 17:22 UTCJul 23, 19:43 UTC2h 21m
2026-07-23 ASA545 - Jul 23, 17:15 UTCJul 23, 19:55 UTC2h 40m
2026-07-23 ASA1348 SEA → PHL Jul 23, 00:25 UTCJul 23, 02:55 UTC2h 30m
2026-07-22 ASA1338 - Jul 22, 19:50 UTCJul 22, 22:15 UTC2h 25m
2026-07-22 ASA1338 SJD → SEA Jul 22, 18:41 UTCJul 22, 22:06 UTC3h 25m
2026-07-22 ASA455 RSW → SEA Jul 22, 14:30 UTCJul 22, 16:25 UTC1h 55m
2026-07-22 ASA455 RSW → SEA Jul 22, 14:42 UTCJul 22, 17:17 UTC2h 35m
2026-07-21 ASA570 SAN → SEA Jul 21, 18:20 UTCJul 21, 19:30 UTC1h 10m
2026-07-21 ASA570 SAN → SEA Jul 21, 18:19 UTCJul 21, 19:18 UTC59m
2026-07-21 ASA718 LAS → SFO Jul 21, 14:40 UTCJul 21, 15:50 UTC1h 10m
2026-07-21 ASA619 PHX → SEA Jul 21, 02:00 UTCJul 21, 03:55 UTC1h 55m
2026-07-20 ASA513 KOA → SEA Jul 20, 18:23 UTCJul 20, 23:12 UTC4h 49m
2026-07-20 ASA513 KOA → SEA Jul 20, 18:15 UTCJul 20, 23:30 UTC5h 15m
2026-07-20 ASA200 SJC → SJD Jul 20, 02:05 UTCJul 20, 07:40 UTC5h 35m
2026-07-19 ASA456 SFO → ORD Jul 19, 22:10 UTCJul 20, 00:10 UTC2h 0m
2026-07-19 ASA456 SFO → ORD Jul 19, 22:04 UTCJul 19, 23:53 UTC1h 49m
2026-07-19 ASA209 LAX → SFO Jul 19, 18:47 UTCJul 19, 20:56 UTC2h 9m
2026-07-19 ASA209 LAX → SFO Jul 19, 18:50 UTCJul 19, 20:45 UTC1h 55m
2026-07-19 ASA670 PDX → LAS Jul 19, 11:50 UTCJul 19, 16:50 UTC5h 0m
2026-07-19 ASA677 LAS → SEA Jul 19, 05:30 UTCJul 19, 09:55 UTC4h 25m
2026-07-19 ASA268 ANC → SEA Jul 19, 00:45 UTCJul 19, 03:45 UTC3h 0m
2026-07-18 ASA657 SEA → ANC Jul 18, 19:51 UTCJul 18, 23:10 UTC3h 19m
2026-07-18 ASA657 SEA → ANC Jul 18, 19:55 UTCJul 18, 23:10 UTC3h 15m
2026-07-18 ASA348 ATL → SEA Jul 18, 13:19 UTCJul 18, 17:48 UTC4h 29m
2026-07-18 ASA348 ATL → SEA Jul 18, 13:20 UTCJul 18, 18:00 UTC4h 40m
2026-07-18 ASA464 SEA → ATL Jul 18, 06:40 UTCJul 18, 11:00 UTC4h 20m
2026-07-18 ASA501 - Jul 18, 02:05 UTCJul 18, 05:15 UTC3h 11m
2026-07-17 ASA497 - Jul 17, 21:44 UTCJul 18, 00:45 UTC3h 0m
2026-07-17 ASA637 - Jul 17, 16:49 UTCJul 17, 19:15 UTC2h 25m
2026-07-17 ASA644 SEA → PHX Jul 17, 04:25 UTCJul 17, 07:00 UTC2h 35m
2026-07-16 ASA1574 DFW → SEA Jul 16, 21:53 UTCJul 17, 01:14 UTC3h 21m
2026-07-16 ASA1574 DFW → SEA Jul 16, 21:55 UTCJul 17, 01:29 UTC3h 35m
2026-07-16 ASA545 - Jul 16, 17:05 UTCJul 16, 19:40 UTC2h 35m
2026-07-16 ASA1470 ORD → SAN Jul 16, 11:34 UTCJul 16, 15:05 UTC3h 30m
2026-07-16 ASA376 PDX → ORD Jul 16, 06:10 UTCJul 16, 09:40 UTC3h 30m
2026-07-16 ASA1807 DEN → PDX Jul 16, 01:30 UTCJul 16, 03:40 UTC2h 10m
2026-07-15 ASA1809 PDX → DEN Jul 15, 21:45 UTCJul 15, 23:55 UTC2h 10m

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 Jul 26, 19:55 UTC.
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.