Apparatus

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sensors Mode-S transponder

A8103E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N619AS · BOEING 737-700 · operated by ALASKA AIRLINES INC

Hex
A8103E
Octal
52010076
Decimal
11,014,206
Country
US
Tail
N619AS
Type
B737
No current signal · last broadcast Jul 26, 20:00 UTC
Flights observed
565
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

Last known position

Most recent position reported by Mode-S A8103E.

Country allocation

The ICAO 24-bit address A8103E 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
ASA66 - 34 2026-07-21
ASA73 Alaska Airlines 32 2026-07-23
ASA62 Alaska Airlines 31 2026-06-02
ASA61 - 31 2026-07-03
ASA65 - 28 2026-06-22
ASA70 Alaska Airlines 24 2026-07-23
ASA69 Alaska Airlines 13 2026-07-25
ASA64 Alaska Airlines 13 2026-06-06
ASA60 Alaska Airlines 12 2026-07-25
ASA55 - 11 2026-07-16
ASA697 Alaska Airlines 10 2026-07-25
ASA67 Alaska Airlines 8 2026-05-13
ASA288 Alaska Airlines 8 2026-05-23
ASA1528 - 8 2026-07-12
ASA614 Alaska Airlines 7 2026-06-02
ASA51 Alaska Airlines 7 2026-07-22
ASA350 - 7 2026-07-19
ASA310 Alaska Airlines 7 2026-06-02
ASA229 Alaska Airlines 7 2026-05-23
ASA1839 Alaska Airlines 7 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA796 SJC → LAX Jul 26, 18:05 UTCJul 26, 19:50 UTC1h 45m
2026-07-26 ASA292 SFO → EWR Jul 26, 15:28 UTCJul 26, 16:53 UTC1h 25m
2026-07-26 ASA292 SFO → EWR Jul 26, 15:20 UTCJul 26, 16:50 UTC1h 30m
2026-07-25 ASA697 MSO → SEA Jul 25, 23:10 UTCJul 26, 00:10 UTC1h 0m
2026-07-25 ASA697 MSO → SEA Jul 25, 23:01 UTCJul 25, 23:59 UTC58m
2026-07-25 ASA697 MSO → SEA Jul 25, 20:40 UTCJul 25, 21:30 UTC50m
2026-07-25 ASA60 KTN → SEA Jul 25, 17:50 UTCJul 25, 19:20 UTC1h 30m
2026-07-25 ASA60 KTN → SEA Jul 25, 17:38 UTCJul 25, 19:03 UTC1h 25m
2026-07-25 ASA60 KTN → SEA Jul 25, 15:40 UTCJul 25, 16:15 UTC35m
2026-07-25 ASA69 SEA → KTN Jul 25, 04:35 UTCJul 25, 05:10 UTC35m
2026-07-25 ASA69 SEA → KTN Jul 25, 04:48 UTCJul 25, 05:14 UTC26m
2026-07-25 ASA69 SEA → KTN Jul 25, 02:20 UTCJul 25, 03:35 UTC1h 15m
2026-07-24 ASA697 MSO → SEA Jul 24, 23:25 UTCJul 25, 00:25 UTC1h 0m
2026-07-24 ASA697 MSO → SEA Jul 24, 23:14 UTCJul 25, 00:24 UTC1h 10m
2026-07-24 ASA697 MSO → SEA Jul 24, 20:55 UTCJul 24, 21:40 UTC45m
2026-07-24 ASA60 KTN → SEA Jul 24, 17:25 UTCJul 24, 18:50 UTC1h 25m
2026-07-24 ASA60 KTN → SEA Jul 24, 15:40 UTCJul 24, 16:15 UTC35m
2026-07-24 ASA69 SEA → KTN Jul 24, 05:15 UTCJul 24, 05:45 UTC30m
2026-07-24 ASA69 SEA → KTN Jul 24, 02:50 UTCJul 24, 04:10 UTC1h 20m
2026-07-23 ASA1839 FAI → SEA Jul 23, 20:30 UTCJul 23, 23:45 UTC3h 15m
2026-07-23 ASA466 ANC → FAI Jul 23, 18:35 UTCJul 23, 19:35 UTC1h 0m
2026-07-23 ASA73 JNU → ANC Jul 23, 15:40 UTCJul 23, 17:20 UTC1h 40m
2026-07-23 ASA73 JNU → ANC Jul 23, 14:15 UTCJul 23, 14:30 UTC15m
2026-07-23 ASA70 ANC → JNU Jul 23, 06:10 UTCJul 23, 06:25 UTC15m
2026-07-23 ASA70 ANC → JNU Jul 23, 04:00 UTCJul 23, 05:10 UTC1h 10m
2026-07-23 ASA52 ANC → LAS Jul 23, 01:20 UTCJul 23, 02:30 UTC1h 10m
2026-07-22 ASA51 ANC → BRW Jul 22, 22:29 UTCJul 23, 00:05 UTC1h 36m
2026-07-22 ASA51 ANC → BRW Jul 22, 22:30 UTCJul 23, 01:30 UTC3h 0m
2026-07-22 ASA225 BUR → PDX Jul 22, 00:27 UTCJul 22, 03:12 UTC2h 45m
2026-07-22 ASA225 BUR → PDX Jul 22, 00:10 UTCJul 22, 03:30 UTC3h 20m
2026-07-21 ASA332 SJC → SEA Jul 21, 19:47 UTCJul 21, 22:37 UTC2h 50m
2026-07-21 ASA232 SEA → SJC Jul 21, 17:40 UTCJul 21, 18:06 UTC26m
2026-07-21 ASA231 LAS → SFO Jul 21, 15:49 UTCJul 21, 16:20 UTC31m
2026-07-21 ASA66 - Jul 21, 02:50 UTCJul 21, 04:55 UTC2h 5m
2026-07-21 ASA66 JNU → SEA Jul 21, 02:43 UTCJul 22, 01:30 UTC22h 47m
2026-07-21 ASA66 - Jul 21, 00:50 UTCJul 21, 01:25 UTC35m
2026-07-20 ASA66 - Jul 20, 23:10 UTCJul 20, 23:45 UTC35m
2026-07-20 ASA66 ANC → CDV Jul 20, 21:25 UTCJul 20, 22:00 UTC35m
2026-07-20 ASA357 BOS → SFO Jul 20, 17:00 UTCJul 20, 20:00 UTC3h 0m
2026-07-20 ASA1554 JNU → SEA Jul 20, 13:25 UTCJul 20, 15:25 UTC2h 0m
2026-07-20 ASA71 - Jul 20, 05:00 UTCJul 20, 07:00 UTC2h 0m
2026-07-19 ASA272 ANC → SEA Jul 19, 23:50 UTCJul 20, 03:05 UTC3h 15m
2026-07-19 ASA1415 LIR → LAX Jul 19, 21:45 UTCJul 19, 22:35 UTC50m
2026-07-19 ASA1552 SEA → FAI Jul 19, 17:10 UTCJul 19, 20:30 UTC3h 20m
2026-07-19 ASA1552 SEA → FAI Jul 19, 17:09 UTCJul 19, 20:30 UTC3h 21m
2026-07-19 ASA364 BOS → SEA Jul 19, 14:25 UTCJul 19, 15:15 UTC50m
2026-07-19 ASA364 BOS → SEA Jul 19, 14:25 UTCJul 19, 14:57 UTC32m
2026-07-19 ASA350 SEA → GEG Jul 19, 06:25 UTCJul 19, 07:00 UTC35m
2026-07-19 ASA350 SEA → GEG Jul 19, 06:21 UTCJul 19, 06:54 UTC33m
2026-07-19 ASA371 FLL → SFO Jul 19, 02:55 UTCJul 19, 03:45 UTC50m

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 N619AS page for operator, model, and routing details .

Mode-S A8103E frequently asked

What is Mode-S code A8103E?
A8103E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N619AS.
Where is Mode-S A8103E registered?
Mode-S code A8103E 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 A8103E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8103E, octal 52010076, decimal 11,014,206.
What flights does A8103E operate?
Mode-S A8103E has broadcast 20 distinct callsigns, including ASA66, ASA73, ASA62, ASA61, ASA65.