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sensors Mode-S transponder

A613E0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N491AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A613E0
Octal
51411740
Decimal
10,884,064
Country
US
Tail
N491AS
Type
B739
Broadcasting now · callsign ASA625 · 34,000 ft
Flights observed
449
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

Current position

A613E0 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A613E0 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
ASA742 - 6 2026-07-19
ASA753 - 5 2026-07-16
ASA700 Alaska Airlines 5 2026-05-15
ASA593 - 5 2026-07-19
ASA270 - 5 2026-06-22
ASA211 Alaska Airlines 5 2026-05-11
ASA787 Alaska Airlines 4 2026-06-07
ASA725 Alaska Airlines 4 2026-06-30
ASA682 Alaska Airlines 4 2026-06-08
ASA662 Alaska Airlines 4 2026-05-16
ASA650 - 4 2026-07-03
ASA637 Alaska Airlines 4 2026-06-09
ASA626 Alaska Airlines 4 2026-07-22
ASA622 Alaska Airlines 4 2026-04-23
ASA598 Alaska Airlines 4 2026-06-16
ASA389 - 4 2026-07-03
ASA383 Alaska Airlines 4 2026-06-07
ASA355 Alaska Airlines 4 2026-04-17
ASA352 Alaska Airlines 4 2026-05-31
ASA31 - 4 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1328 SEA → SFO Jul 26, 18:55 UTCJul 26, 20:40 UTC1h 45m
2026-07-26 ASA512 SFO → AUS Jul 26, 14:40 UTCJul 26, 16:55 UTC2h 15m
2026-07-26 ASA1548 ANC → SAN Jul 26, 00:00 UTCJul 26, 05:15 UTC5h 15m
2026-07-25 ASA1548 ANC → SAN Jul 25, 23:59 UTCJul 26, 05:07 UTC5h 8m
2026-07-25 ASA775 PDX → ANC Jul 25, 18:35 UTCJul 25, 21:45 UTC3h 10m
2026-07-25 ASA679 DEN → PDX Jul 25, 15:25 UTCJul 25, 16:45 UTC1h 20m
2026-07-25 ASA523 RNO → SEA Jul 25, 05:30 UTCJul 25, 07:25 UTC1h 55m
2026-07-24 ASA462 SEA → CMH Jul 24, 22:05 UTCJul 25, 03:45 UTC5h 40m
2026-07-24 ASA297 SAN → EWR Jul 24, 15:35 UTCJul 24, 20:25 UTC4h 50m
2026-07-24 ASA1412 SJD → SEA Jul 24, 08:20 UTCJul 24, 13:25 UTC5h 5m
2026-07-23 ASA94 ANC → SEA Jul 23, 23:50 UTCJul 24, 05:25 UTC5h 35m
2026-07-23 ASA35 JFK → SAN Jul 23, 16:55 UTCJul 23, 22:05 UTC5h 10m
2026-07-22 ASA16 SEA → JFK Jul 22, 21:35 UTCJul 23, 02:15 UTC4h 40m
2026-07-22 ASA720 SEA → OAK Jul 22, 17:20 UTCJul 22, 19:20 UTC2h 0m
2026-07-22 ASA488 SEA → IND Jul 22, 14:08 UTCJul 22, 15:58 UTC1h 50m
2026-07-22 ASA488 SEA → IND Jul 22, 13:50 UTCJul 22, 16:05 UTC2h 15m
2026-07-22 ASA90 FAI → ANC Jul 22, 01:45 UTCJul 22, 02:00 UTC15m
2026-07-22 ASA626 SFO → SEA Jul 22, 00:00 UTCJul 22, 00:15 UTC15m
2026-07-21 ASA626 SFO → SEA Jul 21, 18:35 UTCJul 21, 19:05 UTC30m
2026-07-21 ASA554 PDX → ORD Jul 21, 12:25 UTCJul 21, 15:35 UTC3h 10m
2026-07-21 ASA553 IAD → SFO Jul 21, 02:10 UTCJul 21, 05:15 UTC3h 5m
2026-07-21 ASA456 SFO → ORD Jul 21, 00:30 UTCJul 21, 00:35 UTC5m
2026-07-20 ASA456 SFO → ORD Jul 20, 22:25 UTCJul 21, 00:35 UTC2h 10m
2026-07-20 ASA456 SFO → ORD Jul 20, 22:17 UTCJul 21, 00:15 UTC1h 58m
2026-07-20 ASA209 LAX → SFO Jul 20, 19:05 UTCJul 20, 20:55 UTC1h 50m
2026-07-20 ASA317 DEN → SEA Jul 20, 14:50 UTCJul 20, 17:20 UTC2h 30m
2026-07-20 ASA1627 PDX → DEN Jul 20, 02:20 UTCJul 20, 04:20 UTC2h 0m
2026-07-19 ASA742 PHX → PDX Jul 19, 21:15 UTCJul 19, 23:25 UTC2h 10m
2026-07-19 ASA593 SEA → PHX Jul 19, 17:25 UTCJul 19, 19:50 UTC2h 25m
2026-07-19 ASA409 IAD → SEA Jul 19, 10:30 UTCJul 19, 15:30 UTC5h 0m
2026-07-18 ASA406 SEA → IAD Jul 18, 23:15 UTCJul 19, 03:55 UTC4h 40m
2026-07-18 ASA381 DTW → SEA Jul 18, 19:05 UTCJul 18, 21:25 UTC2h 20m
2026-07-18 ASA375 SEA → DEN Jul 18, 15:25 UTCJul 18, 17:35 UTC2h 10m
2026-07-18 ASA17 JFK → SEA Jul 18, 00:50 UTCJul 18, 06:05 UTC5h 16m
2026-07-18 ASA17 JFK → SEA Jul 18, 00:45 UTCJul 18, 05:58 UTC5h 13m
2026-07-17 ASA18 PDX → JFK Jul 17, 18:00 UTCJul 17, 22:45 UTC4h 45m
2026-07-17 ASA311 SEA → SFO Jul 17, 10:35 UTCJul 17, 16:10 UTC5h 35m
2026-07-16 ASA460 SEA → BOS Jul 16, 23:20 UTCJul 17, 03:50 UTC4h 30m
2026-07-16 ASA753 PDX → SEA Jul 16, 19:20 UTCJul 16, 19:50 UTC30m
2026-07-16 ASA753 PDX → SEA Jul 16, 19:17 UTCJul 16, 20:16 UTC59m
2026-07-16 ASA753 - Jul 16, 16:00 UTCJul 16, 18:25 UTC2h 25m
2026-07-16 ASA1412 - Jul 16, 08:15 UTCJul 16, 13:10 UTC4h 55m
2026-07-16 ASA1412 HNL → SAN Jul 16, 08:12 UTCJul 16, 13:10 UTC4h 58m
2026-07-15 ASA94 - Jul 15, 23:30 UTCJul 16, 05:10 UTC5h 40m
2026-07-15 ASA35 JFK → SAN Jul 15, 15:45 UTCJul 15, 20:35 UTC4h 50m
2026-07-14 ASA42 SFO → JFK Jul 14, 20:50 UTCJul 15, 02:00 UTC5h 9m
2026-07-14 ASA570 LAS → SFO Jul 14, 17:55 UTCJul 14, 19:15 UTC1h 20m
2026-07-14 ASA718 SFO → LAS Jul 14, 14:52 UTCJul 14, 15:45 UTC53m
2026-07-14 ASA718 SFO → LAS Jul 14, 14:40 UTCJul 14, 15:55 UTC1h 15m
2026-07-14 ASA1601 - Jul 14, 05:25 UTCJul 14, 05:35 UTC10m

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 N491AS page for operator, model, and routing details .

Mode-S A613E0 frequently asked

What is Mode-S code A613E0?
A613E0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N491AS.
Where is Mode-S A613E0 registered?
Mode-S code A613E0 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 A613E0 broadcasting right now?
Yes. Mode-S A613E0 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A613E0, octal 51411740, decimal 10,884,064.
What flights does A613E0 operate?
Mode-S A613E0 has broadcast 20 distinct callsigns, including ASA742, ASA753, ASA700, ASA593, ASA270.