Apparatus

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sensors Mode-S transponder

A5BB1B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N469AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A5BB1B
Octal
51335433
Decimal
10,861,339
Country
US
Tail
N469AS
Type
B739
No current signal · last broadcast 11h ago
Flights observed
398
Distinct callsigns
20
Country
US
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S A5BB1B.

Country allocation

The ICAO 24-bit address A5BB1B 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
ASA20 Alaska Airlines 6 2026-04-20
ASA17 Alaska Airlines 6 2026-04-20
ASA670 Alaska Airlines 5 2026-05-07
ASA677 Alaska Airlines 4 2026-05-07
ASA457 - 4 2026-07-12
ASA432 - 4 2026-06-15
ASA343 - 4 2026-06-25
ASA312 Alaska Airlines 4 2026-05-04
ASA1424 Alaska Airlines 4 2026-06-08
ASA1411 - 4 2026-07-01
ASA1347 - 4 2026-07-02
ASA587 Alaska Airlines 3 2026-06-13
ASA56 - 3 2026-07-12
ASA546 Alaska Airlines 3 2026-05-15
ASA521 Alaska Airlines 3 2026-06-01
ASA517 Alaska Airlines 3 2026-05-26
ASA509 Alaska Airlines 3 2026-06-13
ASA502 Alaska Airlines 3 2026-06-07
ASA412 - 3 2026-07-10
ASA324 - 3 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA403 SMF → SEA Jul 14, 03:50 UTCJul 14, 05:15 UTC1h 25m
2026-07-14 ASA1622 PDX → SMF Jul 14, 01:15 UTCJul 14, 02:30 UTC1h 15m
2026-07-14 ASA1622 PDX → SMF Jul 14, 01:19 UTCJul 14, 02:30 UTC1h 11m
2026-07-13 ASA325 - Jul 13, 19:35 UTCJul 13, 23:15 UTC3h 40m
2026-07-13 ASA324 PDX → ORD Jul 13, 14:15 UTCJul 13, 18:05 UTC3h 50m
2026-07-13 ASA324 PDX → ORD Jul 13, 14:20 UTCJul 13, 17:42 UTC3h 22m
2026-07-13 ASA1397 - Jul 13, 01:45 UTCJul 13, 03:30 UTC1h 45m
2026-07-12 ASA56 - Jul 12, 19:15 UTCJul 13, 00:15 UTC5h 0m
2026-07-12 ASA694 FAI → ANC Jul 12, 16:20 UTCJul 12, 17:05 UTC45m
2026-07-12 ASA457 ANC → FAI Jul 12, 14:15 UTCJul 12, 14:55 UTC40m
2026-07-12 ASA771 SEA → ANC Jul 12, 04:35 UTCJul 12, 07:45 UTC3h 10m
2026-07-12 ASA771 - Jul 12, 04:43 UTCJul 12, 07:35 UTC2h 52m
2026-07-12 ASA214 ANN → SEA Jul 12, 01:05 UTCJul 12, 02:40 UTC1h 35m
2026-07-11 ASA92 - Jul 11, 22:30 UTCJul 11, 23:55 UTC1h 25m
2026-07-11 ASA9343 - Jul 11, 15:10 UTCJul 11, 19:35 UTC4h 25m
2026-07-11 ASA9341 - Jul 11, 13:00 UTCJul 11, 13:45 UTC45m
2026-07-10 ASA412 SEA → CVG Jul 10, 16:50 UTCJul 10, 22:25 UTC5h 35m
2026-07-10 ASA563 - Jul 10, 11:05 UTCJul 10, 14:20 UTC3h 15m
2026-07-10 ASA564 - Jul 10, 01:40 UTCJul 10, 04:40 UTC3h 0m
2026-07-09 ASA456 - Jul 9, 22:05 UTCJul 9, 23:55 UTC1h 50m
2026-07-09 ASA209 LAX → SFO Jul 9, 18:55 UTCJul 9, 20:50 UTC1h 55m
2026-07-09 ASA795 SMF → SEA Jul 9, 15:30 UTCJul 9, 17:00 UTC1h 30m
2026-07-09 ASA638 SEA → TUS Jul 9, 02:40 UTCJul 9, 04:00 UTC1h 20m
2026-07-08 ASA1381 - Jul 8, 22:35 UTCJul 9, 00:55 UTC2h 20m
2026-07-08 ASA35 JFK → SAN Jul 8, 15:45 UTCJul 8, 20:45 UTC5h 0m
2026-07-07 ASA36 SAN → JFK Jul 7, 21:35 UTCJul 8, 02:35 UTC5h 0m
2026-07-07 ASA673 - Jul 7, 15:35 UTCJul 7, 17:55 UTC2h 20m
2026-07-07 ASA673 GEG → SAN Jul 7, 15:31 UTCJul 7, 17:52 UTC2h 21m
2026-07-07 ASA1342 - Jul 7, 03:10 UTCJul 7, 03:50 UTC40m
2026-07-06 ASA503 LAX → SEA Jul 6, 22:00 UTCJul 7, 01:50 UTC3h 50m
2026-07-06 ASA422 SEA → AUS Jul 6, 16:15 UTCJul 6, 19:50 UTC3h 35m
2026-07-06 ASA461 - Jul 6, 12:35 UTCJul 6, 13:45 UTC1h 10m
2026-07-06 ASA458 SEA → BZN Jul 6, 04:01 UTCJul 6, 05:10 UTC1h 9m
2026-07-06 ASA458 - Jul 6, 04:05 UTCJul 6, 04:55 UTC50m
2026-07-05 ASA313 SEA → DTW Jul 5, 22:10 UTCJul 6, 02:30 UTC4h 20m
2026-07-05 ASA313 SEA → DTW Jul 5, 16:55 UTCJul 5, 20:40 UTC3h 45m
2026-07-05 ASA643 DEN → SEA Jul 5, 12:25 UTCJul 5, 14:45 UTC2h 20m
2026-07-05 ASA310 SEA → DEN Jul 5, 02:15 UTCJul 5, 04:20 UTC2h 5m
2026-07-04 ASA537 - Jul 4, 21:55 UTCJul 5, 00:00 UTC2h 5m
2026-07-04 ASA529 SEA → BUR Jul 4, 18:30 UTCJul 4, 20:35 UTC2h 5m
2026-07-04 ASA427 PDX → SEA Jul 4, 16:35 UTCJul 4, 17:05 UTC30m
2026-07-04 ASA662 PHX → PDX Jul 4, 01:05 UTCJul 4, 03:30 UTC2h 25m
2026-07-03 ASA700 SEA → PHX Jul 3, 21:10 UTCJul 3, 23:25 UTC2h 15m
2026-07-03 ASA765 ANC → SEA Jul 3, 16:10 UTCJul 3, 19:10 UTC3h 0m
2026-07-03 ASA1613 - Jul 3, 03:15 UTCJul 3, 04:45 UTC1h 30m
2026-07-03 ASA1537 - Jul 3, 00:55 UTCJul 3, 02:05 UTC1h 10m
2026-07-02 ASA1347 FAI → ANC Jul 2, 22:50 UTCJul 2, 23:35 UTC45m
2026-07-02 ASA1347 - Jul 2, 22:49 UTCJul 2, 23:36 UTC47m
2026-07-02 ASA1336 ANC → FAI Jul 2, 20:35 UTCJul 2, 21:20 UTC45m
2026-07-02 ASA1541 MSP → ANC Jul 2, 13:05 UTCJul 2, 18:15 UTC5h 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 N469AS page for operator, model, and routing details .

Mode-S A5BB1B frequently asked

What is Mode-S code A5BB1B?
A5BB1B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N469AS.
Where is Mode-S A5BB1B registered?
Mode-S code A5BB1B 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 A5BB1B broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5BB1B, octal 51335433, decimal 10,861,339.
What flights does A5BB1B operate?
Mode-S A5BB1B has broadcast 20 distinct callsigns, including ASA20, ASA17, ASA670, ASA677, ASA457.