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sensors Mode-S transponder

A2C087

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N277AK · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A2C087
Octal
50540207
Decimal
10,666,119
Country
US
Tail
N277AK
Type
B739
Broadcasting now · callsign ASA1392 · 36,000 ft
Flights observed
275
Distinct callsigns
20
Country
US
Last broadcast
27m ago

Current position

A2C087 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2C087 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
ASA412 - 8 2026-06-27
ASA365 - 5 2026-07-11
ASA25 Alaska Airlines 5 2026-05-15
ASA352 Alaska Airlines 4 2026-05-27
ASA317 - 4 2026-07-02
ASA211 Alaska Airlines 4 2026-04-25
ASA1496 Alaska Airlines 4 2026-05-24
ASA9450 Alaska Airlines 3 2026-06-26
ASA726 Alaska Airlines 3 2026-05-23
ASA701 Alaska Airlines 3 2026-05-11
ASA602 - 3 2026-07-01
ASA500 Alaska Airlines 3 2026-04-13
ASA415 - 3 2026-07-01
ASA414 Alaska Airlines 3 2026-07-01
ASA410 Alaska Airlines 3 2026-04-17
ASA18 Alaska Airlines 3 2026-05-21
ASA1367 Alaska Airlines 3 2026-05-23
ASA99 Alaska Airlines 2 2026-05-24
ASA780 - 2 2026-07-12
ASA776 Alaska Airlines 2 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA1392 - Jul 14, 01:35 UTCJul 14, 01:45 UTC10m
2026-07-13 ASA1447 - Jul 13, 20:35 UTCJul 14, 00:10 UTC3h 35m
2026-07-13 ASA1446 CUN → LAX Jul 13, 14:15 UTCJul 13, 18:05 UTC3h 50m
2026-07-13 ASA201 IAD → SAN Jul 13, 00:15 UTCJul 13, 04:55 UTC4h 40m
2026-07-12 ASA506 - Jul 12, 17:55 UTCJul 12, 22:30 UTC4h 35m
2026-07-12 ASA1557 - Jul 12, 15:20 UTCJul 12, 16:35 UTC1h 15m
2026-07-12 ASA291 - Jul 12, 05:20 UTCJul 12, 06:25 UTC1h 5m
2026-07-12 ASA780 DFW → SAN Jul 12, 01:05 UTCJul 12, 03:30 UTC2h 25m
2026-07-12 ASA780 DFW → SAN Jul 12, 01:05 UTCJul 12, 03:29 UTC2h 24m
2026-07-11 ASA549 SEA → DFW Jul 11, 20:20 UTCJul 11, 23:35 UTC3h 15m
2026-07-11 ASA549 SEA → DFW Jul 11, 20:20 UTCJul 11, 23:24 UTC3h 4m
2026-07-11 ASA365 DFW → SEA Jul 11, 14:33 UTCJul 11, 17:46 UTC3h 13m
2026-07-11 ASA365 DFW → SEA Jul 11, 14:20 UTCJul 11, 18:00 UTC3h 40m
2026-07-11 ASA424 - Jul 11, 01:45 UTCJul 11, 05:10 UTC3h 25m
2026-07-10 ASA1464 OAK → SEA Jul 10, 22:05 UTCJul 10, 23:40 UTC1h 35m
2026-07-10 ASA1328 SEA → SFO Jul 10, 18:55 UTCJul 10, 20:40 UTC1h 45m
2026-07-10 ASA82 ANC → SEA Jul 10, 14:05 UTCJul 10, 17:15 UTC3h 10m
2026-07-10 ASA1363 SEA → ANC Jul 10, 07:35 UTCJul 10, 10:30 UTC2h 55m
2026-07-10 ASA647 STL → SEA Jul 10, 01:40 UTCJul 10, 05:30 UTC3h 50m
2026-07-09 ASA647 SEA → STL Jul 9, 21:00 UTCJul 10, 00:30 UTC3h 30m
2026-07-09 ASA637 - Jul 9, 16:40 UTCJul 9, 19:15 UTC2h 35m
2026-07-09 ASA632 SEA → PHX Jul 9, 03:20 UTCJul 9, 05:40 UTC2h 20m
2026-07-08 ASA503 LAX → SEA Jul 8, 21:55 UTCJul 9, 01:50 UTC3h 55m
2026-07-08 ASA422 SEA → AUS Jul 8, 17:08 UTCJul 8, 20:19 UTC3h 11m
2026-07-08 ASA422 SEA → AUS Jul 8, 17:00 UTCJul 8, 20:35 UTC3h 35m
2026-07-08 ASA1529 SEA → RDU Jul 8, 12:30 UTCJul 8, 15:15 UTC2h 45m
2026-07-08 ASA1526 SEA → MSY Jul 8, 03:35 UTCJul 8, 06:05 UTC2h 30m
2026-07-07 ASA535 DEN → SEA Jul 7, 23:15 UTCJul 8, 01:40 UTC2h 25m
2026-07-07 ASA535 SEA → DEN Jul 7, 18:55 UTCJul 7, 21:35 UTC2h 40m
2026-07-07 ASA277 BUR → SEA Jul 7, 12:00 UTCJul 7, 17:15 UTC5h 15m
2026-07-07 ASA522 SEA → BNA Jul 7, 05:50 UTCJul 7, 10:25 UTC4h 35m
2026-07-06 ASA462 EWR → SEA Jul 6, 22:25 UTCJul 7, 04:10 UTC5h 45m
2026-07-06 ASA297 - Jul 6, 15:45 UTCJul 6, 20:45 UTC5h 0m
2026-07-05 ASA397 - Jul 5, 23:35 UTCJul 6, 04:00 UTC4h 25m
2026-07-05 ASA396 PDX → SJC Jul 5, 20:55 UTCJul 5, 21:45 UTC50m
2026-07-05 ASA396 PDX → SJC Jul 5, 17:25 UTCJul 5, 20:45 UTC3h 20m
2026-07-05 ASA1680 SMF → SAN Jul 5, 14:35 UTCJul 5, 15:50 UTC1h 15m
2026-07-05 ASA1621 SAN → SMF Jul 5, 03:00 UTCJul 5, 04:10 UTC1h 10m
2026-07-04 ASA1312 - Jul 4, 22:05 UTCJul 5, 00:10 UTC2h 5m
2026-07-04 ASA576 SEA → DFW Jul 4, 18:10 UTCJul 4, 20:10 UTC2h 0m
2026-07-04 ASA577 PDX → SAN Jul 4, 14:40 UTCJul 4, 16:50 UTC2h 10m
2026-07-04 ASA525 - Jul 4, 02:00 UTCJul 4, 03:20 UTC1h 20m
2026-07-04 ASA1610 - Jul 4, 00:00 UTCJul 4, 00:50 UTC50m
2026-07-03 ASA1604 SFO → LAX Jul 3, 21:10 UTCJul 3, 22:10 UTC1h 0m
2026-07-03 ASA227 JFK → SFO Jul 3, 14:15 UTCJul 3, 19:45 UTC5h 30m
2026-07-03 ASA227 JFK → SFO Jul 3, 14:12 UTCJul 3, 19:40 UTC5h 28m
2026-07-03 ASA22 SEA → JFK Jul 3, 06:40 UTCJul 3, 11:25 UTC4h 45m
2026-07-03 ASA339 AUS → SEA Jul 3, 00:25 UTCJul 3, 04:15 UTC3h 50m
2026-07-02 ASA604 SEA → AUS Jul 2, 19:00 UTCJul 2, 22:40 UTC3h 40m
2026-07-02 ASA317 DEN → SEA Jul 2, 14:50 UTCJul 2, 17:25 UTC2h 35m

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 N277AK page for operator, model, and routing details .

Mode-S A2C087 frequently asked

What is Mode-S code A2C087?
A2C087 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N277AK.
Where is Mode-S A2C087 registered?
Mode-S code A2C087 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 A2C087 broadcasting right now?
Yes. Mode-S A2C087 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2C087, octal 50540207, decimal 10,666,119.
What flights does A2C087 operate?
Mode-S A2C087 has broadcast 20 distinct callsigns, including ASA412, ASA365, ASA25, ASA352, ASA317.