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
Broadcasting now · callsign ASA40 · 33,000 ft
Flights observed
438
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Current position

A5BB1B is currently broadcasting. Map zoomed to live position.

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
ASA56 - 4 2026-07-17
ASA457 - 4 2026-07-12
ASA432 - 4 2026-06-15
ASA343 - 4 2026-06-25
ASA324 Alaska Airlines 4 2026-07-24
ASA312 Alaska Airlines 4 2026-05-04
ASA1424 Alaska Airlines 4 2026-06-08
ASA1411 - 4 2026-07-01
ASA1397 - 4 2026-07-18
ASA1347 - 4 2026-07-02
ASA737 - 3 2026-07-20
ASA587 Alaska Airlines 3 2026-06-13
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1602 SFO → LAX Jul 26, 20:35 UTCJul 26, 21:30 UTC55m
2026-07-26 ASA526 PDX → MCO Jul 26, 17:25 UTCJul 26, 19:00 UTC1h 35m
2026-07-25 ASA1519 ANC → FAI Jul 25, 23:05 UTCJul 26, 02:20 UTC3h 15m
2026-07-25 ASA1525 MCO → SEA Jul 25, 18:50 UTCJul 25, 21:45 UTC2h 55m
2026-07-25 ASA562 SFO → LAS Jul 25, 14:30 UTCJul 25, 16:15 UTC1h 45m
2026-07-25 ASA559 SFO → SEA Jul 25, 01:19 UTCJul 25, 03:12 UTC1h 53m
2026-07-25 ASA559 SFO → SEA Jul 25, 01:15 UTCJul 25, 03:15 UTC2h 0m
2026-07-24 ASA325 ORD → PDX Jul 24, 20:00 UTCJul 24, 23:55 UTC3h 55m
2026-07-24 ASA324 SEA → SJC Jul 24, 14:50 UTCJul 24, 18:10 UTC3h 20m
2026-07-24 ASA1519 ANC → FAI Jul 24, 02:40 UTCJul 24, 05:50 UTC3h 10m
2026-07-23 ASA1525 MCO → SEA Jul 23, 22:40 UTCJul 24, 01:25 UTC2h 45m
2026-07-22 ASA301 LIH → SJC Jul 22, 21:50 UTCJul 23, 03:35 UTC5h 45m
2026-07-22 ASA295 SEA → MCO Jul 22, 15:05 UTCJul 22, 20:05 UTC5h 0m
2026-07-21 ASA230 EWR → SEA Jul 21, 23:30 UTCJul 22, 05:05 UTC5h 35m
2026-07-21 ASA314 SEA → EWR Jul 21, 06:45 UTCJul 21, 11:20 UTC4h 35m
2026-07-20 ASA737 IAD → SEA Jul 20, 23:00 UTCJul 21, 04:15 UTC5h 15m
2026-07-20 ASA737 SEA → IAD Jul 20, 16:50 UTCJul 20, 20:55 UTC4h 5m
2026-07-20 ASA387 MSP → SEA Jul 20, 11:36 UTCJul 20, 14:41 UTC3h 5m
2026-07-20 ASA387 MSP → SEA Jul 20, 11:20 UTCJul 20, 14:50 UTC3h 30m
2026-07-20 ASA386 SEA → MSP Jul 20, 02:25 UTCJul 20, 04:55 UTC2h 30m
2026-07-20 ASA386 SEA → MSP Jul 20, 02:23 UTCJul 20, 04:51 UTC2h 28m
2026-07-19 ASA402 ANC → SEA Jul 19, 21:35 UTCJul 20, 00:40 UTC3h 5m
2026-07-19 ASA53 - Jul 19, 15:20 UTCJul 19, 20:10 UTC4h 50m
2026-07-19 ASA617 LIR → LAX Jul 19, 00:57 UTCJul 19, 06:24 UTC5h 27m
2026-07-18 ASA1330 LAX → LIR Jul 18, 18:25 UTCJul 19, 06:40 UTC12h 15m
2026-07-18 ASA1611 - Jul 18, 13:25 UTCJul 18, 15:50 UTC2h 25m
2026-07-18 ASA1356 PDX → GEG Jul 18, 05:20 UTCJul 18, 06:10 UTC50m
2026-07-18 ASA1356 PDX → GEG Jul 18, 05:19 UTCJul 18, 06:01 UTC42m
2026-07-18 ASA1397 - Jul 18, 02:09 UTCJul 18, 02:45 UTC35m
2026-07-18 ASA1397 CUN → SAN Jul 18, 02:07 UTCJul 18, 03:57 UTC1h 50m
2026-07-17 ASA56 - Jul 17, 19:35 UTCJul 18, 00:29 UTC4h 55m
2026-07-17 ASA1615 PDX → ANC Jul 17, 14:35 UTCJul 17, 17:50 UTC3h 15m
2026-07-17 ASA1520 FAI → PDX Jul 17, 08:49 UTCJul 17, 12:19 UTC3h 30m
2026-07-17 ASA1520 FAI → PDX Jul 17, 08:49 UTCJul 17, 12:20 UTC3h 31m
2026-07-17 ASA1880 SFO → PHX Jul 17, 03:50 UTCJul 17, 07:00 UTC3h 10m
2026-07-16 ASA510 MSP → SEA Jul 16, 22:35 UTCJul 17, 01:45 UTC3h 10m
2026-07-16 ASA1429 - Jul 16, 17:49 UTCJul 16, 20:39 UTC2h 50m
2026-07-16 ASA1429 PDX → MSP Jul 16, 17:50 UTCJul 16, 20:35 UTC2h 45m
2026-07-15 ASA783 ATL → PDX Jul 15, 22:50 UTCJul 16, 03:15 UTC4h 25m
2026-07-15 ASA334 SEA → ATL Jul 15, 16:55 UTCJul 15, 21:25 UTC4h 30m
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

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?
Yes. Mode-S A5BB1B is currently airborne.
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, ASA56.