Apparatus

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sensors Mode-S transponder

A2B919

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N275AK · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A2B919
Octal
50534431
Decimal
10,664,217
Country
US
Tail
N275AK
Type
B739
Broadcasting now · callsign ASA700 · 29,550 ft
Flights observed
307
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Current position

A2B919 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2B919 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
ASA326 Alaska Airlines 9 2026-04-16
ASA442 Alaska Airlines 5 2026-06-07
ASA211 - 5 2026-07-06
ASA625 Alaska Airlines 4 2026-05-31
ASA62 Alaska Airlines 4 2026-06-23
ASA587 Alaska Airlines 4 2026-07-26
ASA535 - 4 2026-07-02
ASA774 Alaska Airlines 3 2026-06-03
ASA757 - 3 2026-07-20
ASA510 - 3 2026-07-15
ASA451 - 3 2026-07-11
ASA443 Alaska Airlines 3 2026-04-15
ASA400 - 3 2026-06-24
ASA310 Alaska Airlines 3 2026-07-25
ASA299 - 3 2026-07-14
ASA295 Alaska Airlines 3 2026-06-10
ASA281 Alaska Airlines 3 2026-06-17
ASA1638 Alaska Airlines 3 2026-06-30
ASA1617 Alaska Airlines 3 2026-06-30
ASA1533 - 3 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA1371 MZT → SFO Jul 26, 19:45 UTCJul 26, 22:15 UTC2h 30m
2026-07-26 ASA587 ORD → SEA Jul 26, 14:06 UTCJul 26, 17:39 UTC3h 33m
2026-07-26 ASA587 ORD → SEA Jul 26, 13:50 UTCJul 26, 17:55 UTC4h 5m
2026-07-26 ASA1724 ANC → ORD Jul 26, 05:35 UTCJul 26, 11:15 UTC5h 41m
2026-07-26 ASA257 SJC → KOA Jul 26, 00:15 UTCJul 26, 02:29 UTC2h 14m
2026-07-25 ASA1558 ANC → ADK Jul 25, 20:20 UTCJul 26, 02:45 UTC6h 25m
2026-07-25 ASA432 LAX → SEA Jul 25, 13:35 UTCJul 25, 18:30 UTC4h 55m
2026-07-25 ASA310 PDX → SJC Jul 25, 02:20 UTCJul 25, 04:25 UTC2h 5m
2026-07-24 ASA425 SFO → BOS Jul 24, 22:00 UTCJul 25, 00:30 UTC2h 30m
2026-07-24 ASA747 PSP → PDX Jul 24, 17:40 UTCJul 24, 20:15 UTC2h 35m
2026-07-24 ASA1572 LAS → PAE Jul 24, 14:20 UTCJul 24, 16:20 UTC2h 0m
2026-07-24 ASA531 LAX → PDX Jul 24, 01:20 UTCJul 24, 03:10 UTC1h 50m
2026-07-23 ASA229 LAS → SEA Jul 23, 23:10 UTCJul 24, 00:00 UTC50m
2026-07-23 ASA229 LAS → SEA Jul 23, 23:05 UTCJul 24, 00:00 UTC55m
2026-07-23 ASA441 MSY → SEA Jul 23, 20:50 UTCJul 23, 21:50 UTC1h 0m
2026-07-23 ASA441 MSY → SEA Jul 23, 20:47 UTCJul 23, 21:47 UTC1h 0m
2026-07-23 ASA317 BOS → SEA Jul 23, 16:30 UTCJul 23, 18:55 UTC2h 25m
2026-07-23 ASA317 BOS → SEA Jul 23, 16:28 UTCJul 23, 18:37 UTC2h 9m
2026-07-23 ASA642 SEA → DEN Jul 23, 05:15 UTCJul 23, 07:25 UTC2h 10m
2026-07-22 ASA508 CVG → SEA Jul 22, 21:15 UTCJul 23, 01:50 UTC4h 35m
2026-07-22 ASA508 CVG → SEA Jul 22, 16:10 UTCJul 22, 19:50 UTC3h 40m
2026-07-22 ASA643 DEN → SEA Jul 22, 12:15 UTCJul 22, 14:30 UTC2h 15m
2026-07-22 ASA643 DEN → SEA Jul 22, 12:13 UTCJul 22, 14:15 UTC2h 2m
2026-07-21 ASA602 SEA → SFO Jul 21, 23:45 UTCJul 22, 02:15 UTC2h 30m
2026-07-21 ASA415 LAX → SEA Jul 21, 18:20 UTCJul 21, 21:55 UTC3h 35m
2026-07-21 ASA414 SFO → LAS Jul 21, 13:10 UTCJul 21, 16:30 UTC3h 20m
2026-07-21 ASA403 SMF → SEA Jul 21, 03:55 UTCJul 21, 05:10 UTC1h 15m
2026-07-21 ASA1622 PDX → SMF Jul 21, 01:20 UTCJul 21, 02:30 UTC1h 10m
2026-07-20 ASA756 LAS → PDX Jul 20, 21:45 UTCJul 20, 23:30 UTC1h 45m
2026-07-20 ASA757 - Jul 20, 20:10 UTCJul 20, 20:20 UTC10m
2026-07-20 ASA757 - Jul 20, 18:05 UTCJul 20, 20:15 UTC2h 10m
2026-07-20 ASA757 PDX → LAS Jul 20, 18:03 UTCJul 20, 19:54 UTC1h 51m
2026-07-19 ASA290 PDX → EWR Jul 19, 22:05 UTCJul 20, 03:35 UTC5h 30m
2026-07-19 ASA239 LIH → SJC Jul 19, 15:10 UTCJul 19, 20:25 UTC5h 15m
2026-07-18 ASA1391 SJD → SEA Jul 18, 17:25 UTCJul 19, 03:30 UTC10h 5m
2026-07-18 ASA701 LAS → SEA Jul 18, 13:35 UTCJul 18, 15:35 UTC2h 0m
2026-07-18 ASA701 LAS → SEA Jul 18, 13:33 UTCJul 18, 15:29 UTC1h 56m
2026-07-18 ASA468 - Jul 18, 05:50 UTCJul 18, 06:55 UTC1h 5m
2026-07-18 ASA1601 LAX → SFO Jul 18, 03:10 UTCJul 18, 04:05 UTC55m
2026-07-17 ASA1406 LAX → ZLO Jul 17, 19:35 UTCJul 18, 00:45 UTC5h 10m
2026-07-17 ASA673 GEG → SAN Jul 17, 15:29 UTCJul 17, 18:05 UTC2h 35m
2026-07-17 ASA1342 SEA → GEG Jul 17, 03:20 UTCJul 17, 03:59 UTC40m
2026-07-16 ASA698 LAS → SEA Jul 16, 23:49 UTCJul 17, 01:55 UTC2h 5m
2026-07-16 ASA738 SEA → LAS Jul 16, 20:15 UTCJul 16, 22:19 UTC2h 5m
2026-07-16 ASA645 PHX → SEA Jul 16, 14:40 UTCJul 16, 17:20 UTC2h 40m
2026-07-16 ASA644 SEA → PHX Jul 16, 04:05 UTCJul 16, 06:50 UTC2h 45m
2026-07-15 ASA510 MSP → SEA Jul 15, 23:00 UTCJul 16, 02:15 UTC3h 15m
2026-07-15 ASA1429 PDX → MSP Jul 15, 18:50 UTCJul 15, 21:45 UTC2h 55m
2026-07-15 ASA511 PHX → PDX Jul 15, 15:10 UTCJul 15, 17:20 UTC2h 10m
2026-07-15 ASA1550 - Jul 15, 07:30 UTCJul 15, 12:45 UTC5h 15m

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 N275AK page for operator, model, and routing details .

Mode-S A2B919 frequently asked

What is Mode-S code A2B919?
A2B919 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N275AK.
Where is Mode-S A2B919 registered?
Mode-S code A2B919 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 A2B919 broadcasting right now?
Yes. Mode-S A2B919 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B919, octal 50534431, decimal 10,664,217.
What flights does A2B919 operate?
Mode-S A2B919 has broadcast 20 distinct callsigns, including ASA326, ASA442, ASA211, ASA625, ASA62.