Apparatus

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sensors Mode-S transponder

A2A686

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N270AK · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A2A686
Octal
50523206
Decimal
10,659,462
Country
US
Tail
N270AK
Type
B739
No current signal · last broadcast 8d ago
Flights observed
341
Distinct callsigns
20
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S A2A686.

Country allocation

The ICAO 24-bit address A2A686 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
ASA450 - 6 2026-07-01
ASA412 - 6 2026-06-15
ASA682 Alaska Airlines 5 2026-05-08
ASA356 - 5 2026-06-28
ASA1349 Alaska Airlines 5 2026-06-01
ASA778 Alaska Airlines 4 2026-05-03
ASA621 - 4 2026-06-26
ASA500 Alaska Airlines 4 2026-05-29
ASA230 Alaska Airlines 4 2026-06-09
ASA1600 Alaska Airlines 4 2026-06-20
ASA1367 Alaska Airlines 4 2026-05-28
ASA785 - 3 2026-06-16
ASA784 - 3 2026-06-24
ASA731 - 3 2026-06-26
ASA612 Alaska Airlines 3 2026-06-16
ASA565 Alaska Airlines 3 2026-05-22
ASA462 Alaska Airlines 3 2026-05-09
ASA440 Alaska Airlines 3 2026-06-11
ASA409 - 3 2026-07-01
ASA395 - 3 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 ASA9421 SEA → OKC Jul 5, 18:35 UTCJul 5, 21:35 UTC3h 0m
2026-07-04 ASA214 - Jul 4, 23:55 UTCJul 5, 01:25 UTC1h 30m
2026-07-04 ASA92 - Jul 4, 21:15 UTCJul 4, 22:35 UTC1h 20m
2026-07-04 ASA623 - Jul 4, 14:40 UTCJul 4, 19:20 UTC4h 40m
2026-07-04 ASA416 - Jul 4, 00:40 UTCJul 4, 04:45 UTC4h 5m
2026-07-03 ASA418 - Jul 3, 19:30 UTCJul 3, 22:45 UTC3h 15m
2026-07-03 ASA418 - Jul 3, 15:10 UTCJul 3, 18:05 UTC2h 55m
2026-07-03 ASA75 ANC → SEA Jul 3, 10:30 UTCJul 3, 13:15 UTC2h 45m
2026-07-03 ASA212 - Jul 3, 03:15 UTCJul 3, 07:40 UTC4h 25m
2026-07-03 ASA1385 SEA → SFO Jul 3, 00:05 UTCJul 3, 01:50 UTC1h 45m
2026-07-01 ASA450 - Jul 1, 22:50 UTCJul 2, 03:15 UTC4h 25m
2026-07-01 ASA450 SEA → CMH Jul 1, 17:30 UTCJul 1, 21:25 UTC3h 55m
2026-07-01 ASA409 IAD → SEA Jul 1, 10:20 UTCJul 1, 15:25 UTC5h 5m
2026-07-01 ASA409 IAD → SEA Jul 1, 10:17 UTCJul 1, 15:17 UTC5h 0m
2026-06-30 ASA406 SEA → IAD Jun 30, 23:20 UTCJul 1, 03:50 UTC4h 30m
2026-06-30 ASA475 SAN → SEA Jun 30, 19:10 UTCJun 30, 21:40 UTC2h 30m
2026-06-30 ASA1471 - Jun 30, 14:45 UTCJun 30, 17:00 UTC2h 15m
2026-06-29 ASA1338 - Jun 29, 14:19 UTCJun 29, 22:39 UTC8h 20m
2026-06-29 ASA590 SFO → ORD Jun 29, 05:15 UTCJun 29, 06:59 UTC1h 45m
2026-06-28 ASA356 - Jun 28, 20:50 UTCJun 29, 02:05 UTC5h 15m
2026-06-28 ASA239 SEA → EWR Jun 28, 14:39 UTCJun 28, 19:25 UTC4h 45m
2026-06-28 ASA98 - Jun 28, 09:45 UTCJun 28, 12:39 UTC2h 55m
2026-06-28 ASA212 - Jun 28, 03:40 UTCJun 28, 08:29 UTC4h 50m
2026-06-27 ASA1407 - Jun 27, 19:09 UTCJun 28, 01:44 UTC6h 35m
2026-06-27 ASA725 LAS → PDX Jun 27, 16:00 UTCJun 27, 17:44 UTC1h 45m
2026-06-27 ASA1498 ANC → SEA Jun 27, 09:00 UTCJun 27, 12:04 UTC3h 5m
2026-06-27 ASA1498 ANC → SEA Jun 27, 09:00 UTCJun 27, 11:56 UTC2h 56m
2026-06-27 ASA1532 PHX → ANC Jun 27, 02:14 UTCJun 27, 07:24 UTC5h 10m
2026-06-26 ASA731 PDX → PHX Jun 26, 21:55 UTCJun 27, 00:05 UTC2h 10m
2026-06-26 ASA621 SMF → PDX Jun 26, 19:08 UTCJun 26, 20:10 UTC1h 2m
2026-06-26 ASA621 SMF → PDX Jun 26, 18:54 UTCJun 26, 20:10 UTC1h 15m
2026-06-26 ASA485 PDX → SMF Jun 26, 15:20 UTCJun 26, 16:30 UTC1h 10m
2026-06-25 ASA1350 - Jun 25, 21:59 UTCJun 26, 02:50 UTC4h 50m
2026-06-25 ASA1350 BNA → PDX Jun 25, 22:10 UTCJun 26, 02:42 UTC4h 32m
2026-06-25 ASA1345 - Jun 25, 16:29 UTCJun 25, 20:14 UTC3h 45m
2026-06-25 ASA1529 SEA → RDU Jun 25, 12:15 UTCJun 25, 14:59 UTC2h 45m
2026-06-25 ASA1526 SEA → MSY Jun 25, 03:24 UTCJun 25, 05:44 UTC2h 20m
2026-06-24 ASA218 SFO → PDX Jun 24, 20:40 UTCJun 25, 01:44 UTC5h 5m
2026-06-24 ASA218 SFO → PDX Jun 24, 20:37 UTCJun 25, 01:45 UTC5h 8m
2026-06-24 ASA784 PDX → ATL Jun 24, 15:24 UTCJun 24, 19:20 UTC3h 55m
2026-06-24 ASA784 PDX → ATL Jun 24, 15:17 UTCJun 24, 19:09 UTC3h 52m
2026-06-24 ASA1457 - Jun 24, 06:50 UTCJun 24, 07:20 UTC30m
2026-06-24 ASA339 AUS → SEA Jun 24, 00:30 UTCJun 24, 04:24 UTC3h 55m
2026-06-23 ASA604 - Jun 23, 19:39 UTCJun 23, 23:10 UTC3h 30m
2026-06-23 ASA1533 - Jun 23, 15:09 UTCJun 23, 17:15 UTC2h 5m
2026-06-23 ASA1559 SEA → JNU Jun 23, 03:29 UTCJun 23, 05:24 UTC1h 55m
2026-06-23 ASA1559 SEA → JNU Jun 23, 03:31 UTCJun 23, 05:33 UTC2h 2m
2026-06-22 ASA494 - Jun 22, 21:54 UTCJun 23, 01:54 UTC4h 0m
2026-06-22 ASA494 - Jun 22, 17:15 UTCJun 22, 20:39 UTC3h 25m
2026-06-22 ASA554 PDX → ORD Jun 22, 12:15 UTCJun 22, 15:50 UTC3h 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 N270AK page for operator, model, and routing details .

Mode-S A2A686 frequently asked

What is Mode-S code A2A686?
A2A686 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N270AK.
Where is Mode-S A2A686 registered?
Mode-S code A2A686 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 A2A686 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2A686, octal 50523206, decimal 10,659,462.
What flights does A2A686 operate?
Mode-S A2A686 has broadcast 20 distinct callsigns, including ASA450, ASA412, ASA682, ASA356, ASA1349.