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 ASA1631 · 35,000 ft
Flights observed
252
Distinct callsigns
20
Country
US
Last broadcast
1h ago

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
ASA535 - 4 2026-07-02
ASA774 Alaska Airlines 3 2026-06-03
ASA451 - 3 2026-07-11
ASA443 Alaska Airlines 3 2026-04-15
ASA400 - 3 2026-06-24
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
ASA9825 Alaska Airlines 2 2026-04-17
ASA98 Alaska Airlines 2 2026-06-10
ASA9665 - 2 2026-06-25
ASA780 Alaska Airlines 2 2026-06-03
ASA778 - 2 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA1631 - Jul 14, 04:45 UTCJul 14, 05:55 UTC1h 10m
2026-07-13 ASA1519 - Jul 13, 23:05 UTCJul 14, 02:10 UTC3h 5m
2026-07-13 ASA1525 - Jul 13, 18:40 UTCJul 13, 21:45 UTC3h 5m
2026-07-13 ASA1525 PDX → MCI Jul 13, 18:39 UTCJul 13, 21:40 UTC3h 1m
2026-07-13 ASA349 LAS → PDX Jul 13, 15:20 UTCJul 13, 17:00 UTC1h 40m
2026-07-13 ASA1636 - Jul 13, 08:15 UTCJul 13, 13:10 UTC4h 55m
2026-07-13 ASA1636 ANC → LAS Jul 13, 08:16 UTCJul 13, 13:00 UTC4h 44m
2026-07-13 ASA663 SEA → ANC Jul 13, 03:55 UTCJul 13, 07:01 UTC3h 5m
2026-07-12 ASA425 PHX → SEA Jul 12, 22:10 UTCJul 13, 00:30 UTC2h 20m
2026-07-12 ASA747 PAE → PHX Jul 12, 17:50 UTCJul 12, 20:30 UTC2h 40m
2026-07-12 ASA1572 LAS → PAE Jul 12, 14:35 UTCJul 12, 16:35 UTC2h 0m
2026-07-12 ASA704 SEA → LAS Jul 12, 03:40 UTCJul 12, 05:50 UTC2h 10m
2026-07-11 ASA289 PHX → SEA Jul 11, 23:10 UTCJul 12, 01:40 UTC2h 30m
2026-07-11 ASA1371 SEA → PHX Jul 11, 19:15 UTCJul 11, 21:45 UTC2h 30m
2026-07-11 ASA451 - Jul 11, 12:30 UTCJul 11, 17:00 UTC4h 30m
2026-07-11 ASA490 SEA → MSY Jul 11, 06:55 UTCJul 11, 10:55 UTC4h 0m
2026-07-10 ASA379 - Jul 10, 22:20 UTCJul 11, 03:35 UTC5h 15m
2026-07-10 ASA378 SEA → BWI Jul 10, 16:10 UTCJul 10, 20:50 UTC4h 40m
2026-07-10 ASA387 MSP → SEA Jul 10, 11:25 UTCJul 10, 14:30 UTC3h 5m
2026-07-09 ASA527 SNA → SEA Jul 9, 21:06 UTCJul 9, 23:44 UTC2h 38m
2026-07-09 ASA527 SNA → SEA Jul 9, 21:00 UTCJul 9, 23:45 UTC2h 45m
2026-07-09 ASA623 BNA → SEA Jul 9, 14:40 UTCJul 9, 19:10 UTC4h 30m
2026-07-09 ASA416 SEA → BNA Jul 9, 00:50 UTCJul 9, 04:40 UTC3h 50m
2026-07-08 ASA521 SJC → SEA Jul 8, 21:30 UTCJul 8, 23:10 UTC1h 40m
2026-07-08 ASA335 SEA → SJC Jul 8, 18:35 UTCJul 8, 20:15 UTC1h 40m
2026-07-08 ASA335 SEA → SJC Jul 8, 18:33 UTCJul 8, 20:14 UTC1h 41m
2026-07-08 ASA21 JFK → SEA Jul 8, 11:30 UTCJul 8, 16:50 UTC5h 20m
2026-07-07 ASA42 SFO → JFK Jul 7, 21:40 UTCJul 8, 02:50 UTC5h 10m
2026-07-07 ASA1445 PDX → SFO Jul 7, 18:45 UTCJul 7, 20:10 UTC1h 25m
2026-07-07 ASA679 SJC → PDX Jul 7, 15:05 UTCJul 7, 16:25 UTC1h 20m
2026-07-07 ASA678 PDX → SJC Jul 7, 05:00 UTCJul 7, 06:25 UTC1h 25m
2026-07-07 ASA779 LAS → PDX Jul 7, 01:35 UTCJul 7, 03:25 UTC1h 50m
2026-07-06 ASA776 - Jul 6, 23:10 UTCJul 7, 00:20 UTC1h 10m
2026-07-06 ASA41 JFK → SFO Jul 6, 16:25 UTCJul 6, 22:00 UTC5h 35m
2026-07-06 ASA211 - Jul 6, 05:00 UTCJul 6, 09:55 UTC4h 55m
2026-07-06 ASA634 LAS → SFO Jul 6, 01:55 UTCJul 6, 03:05 UTC1h 10m
2026-07-05 ASA778 PDX → LAS Jul 5, 22:20 UTCJul 6, 00:10 UTC1h 50m
2026-07-05 ASA778 PDX → LAS Jul 5, 22:06 UTCJul 5, 23:54 UTC1h 48m
2026-07-05 ASA576 SEA → DFW Jul 5, 18:35 UTCJul 5, 20:35 UTC2h 0m
2026-07-05 ASA577 PDX → SAN Jul 5, 14:40 UTCJul 5, 16:50 UTC2h 10m
2026-07-05 ASA609 LAX → PDX Jul 5, 09:35 UTCJul 5, 12:35 UTC3h 0m
2026-07-05 ASA39 SLC → ANC Jul 5, 02:45 UTCJul 5, 07:15 UTC4h 30m
2026-07-04 ASA368 SEA → SLC Jul 4, 22:00 UTCJul 4, 23:35 UTC1h 35m
2026-07-04 ASA315 ANC → SEA Jul 4, 17:10 UTCJul 4, 20:10 UTC3h 0m
2026-07-03 ASA657 SEA → ANC Jul 3, 19:35 UTCJul 3, 22:45 UTC3h 10m
2026-07-03 ASA1409 SMF → SEA Jul 3, 13:20 UTCJul 3, 14:55 UTC1h 35m
2026-07-03 ASA1427 SEA → SMF Jul 3, 04:10 UTCJul 3, 05:30 UTC1h 20m
2026-07-02 ASA535 DEN → SEA Jul 2, 23:35 UTCJul 3, 02:05 UTC2h 30m
2026-07-02 ASA535 SEA → DEN Jul 2, 19:45 UTCJul 2, 21:55 UTC2h 10m
2026-07-02 ASA348 ATL → SEA Jul 2, 13:18 UTCJul 2, 17:44 UTC4h 26m

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.