Apparatus

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sensors Mode-S transponder

A9CECD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N731AL · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
A9CECD
Octal
52347315
Decimal
11,128,525
Country
US
Tail
N731AL
Type
B39M
No current signal · last broadcast Jul 26, 20:10 UTC
Flights observed
452
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Last known position

Most recent position reported by Mode-S A9CECD.

Country allocation

The ICAO 24-bit address A9CECD 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
ASA62 Alaska Airlines 20 2026-07-03
ASA238 - 9 2026-07-07
ASA49 Alaska Airlines 8 2026-07-24
ASA50 Alaska Airlines 7 2026-07-24
ASA306 Alaska Airlines 7 2026-04-18
ASA626 - 6 2026-07-10
ASA259 - 6 2026-07-07
ASA90 - 4 2026-07-11
ASA507 Alaska Airlines 4 2026-06-29
ASA500 Alaska Airlines 4 2026-04-30
ASA418 - 4 2026-07-20
ASA403 Alaska Airlines 4 2026-06-05
ASA1423 Alaska Airlines 4 2026-05-28
ASA1420 Alaska Airlines 4 2026-05-25
ASA1412 - 4 2026-07-17
ASA83 - 3 2026-07-02
ASA81 Alaska Airlines 3 2026-06-08
ASA798 - 3 2026-06-25
ASA765 - 3 2026-07-24
ASA707 Alaska Airlines 3 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA716 SFO → SAN Jul 26, 17:50 UTCJul 26, 20:05 UTC2h 15m
2026-07-25 ASA253 SBA → SEA Jul 25, 22:18 UTCJul 26, 03:12 UTC4h 54m
2026-07-25 ASA253 SBA → SEA Jul 25, 22:10 UTCJul 26, 03:10 UTC5h 0m
2026-07-25 ASA252 PDX → KOA Jul 25, 15:20 UTCJul 25, 20:40 UTC5h 20m
2026-07-25 ASA558 SEA → SAN Jul 25, 11:25 UTCJul 25, 12:10 UTC45m
2026-07-25 ASA223 SEA → FAI Jul 25, 02:30 UTCJul 25, 02:40 UTC10m
2026-07-24 ASA223 SEA → FAI Jul 24, 21:10 UTCJul 24, 22:05 UTC55m
2026-07-24 ASA223 SEA → FAI Jul 24, 21:08 UTCJul 25, 02:31 UTC5h 23m
2026-07-24 ASA765 ANC → SEA Jul 24, 16:10 UTCJul 24, 19:05 UTC2h 55m
2026-07-24 ASA50 BRW → ANC Jul 24, 12:15 UTCJul 24, 13:15 UTC1h 0m
2026-07-24 ASA49 SNA → PDX Jul 24, 05:35 UTCJul 24, 05:50 UTC15m
2026-07-24 ASA49 SNA → PDX Jul 24, 00:20 UTCJul 24, 01:10 UTC50m
2026-07-23 ASA433 IAD → SFO Jul 23, 18:45 UTCJul 23, 22:05 UTC3h 20m
2026-07-23 ASA395 MCO → SEA Jul 23, 11:20 UTCJul 23, 16:40 UTC5h 20m
2026-07-23 ASA707 LAX → PDX Jul 23, 04:25 UTCJul 23, 08:45 UTC4h 20m
2026-07-22 ASA25 BOS → SEA Jul 22, 21:35 UTCJul 23, 02:45 UTC5h 10m
2026-07-22 ASA20 SFO → JFK Jul 22, 14:40 UTCJul 22, 19:30 UTC4h 50m
2026-07-22 ASA404 KOA → SFO Jul 22, 02:00 UTCJul 22, 06:03 UTC4h 3m
2026-07-22 ASA404 - Jul 22, 01:45 UTCJul 22, 02:00 UTC15m
2026-07-21 ASA204 LAX → SFO Jul 21, 18:50 UTCJul 22, 00:30 UTC5h 40m
2026-07-21 ASA453 - Jul 21, 11:15 UTCJul 21, 15:00 UTC3h 45m
2026-07-21 ASA1573 SEA → IAH Jul 21, 00:50 UTCJul 21, 04:40 UTC3h 50m
2026-07-20 ASA418 - Jul 20, 19:30 UTCJul 20, 22:45 UTC3h 15m
2026-07-20 ASA418 - Jul 20, 15:05 UTCJul 20, 17:50 UTC2h 45m
2026-07-20 ASA495 SAT → SEA Jul 20, 04:30 UTCJul 20, 06:30 UTC2h 0m
2026-07-20 ASA492 SEA → LAX Jul 20, 00:35 UTCJul 20, 03:00 UTC2h 25m
2026-07-19 ASA521 AUS → SEA Jul 19, 21:45 UTCJul 19, 23:15 UTC1h 30m
2026-07-19 ASA521 AUS → SEA Jul 19, 21:44 UTCJul 19, 23:09 UTC1h 25m
2026-07-19 ASA335 SEA → SJC Jul 19, 18:50 UTCJul 19, 20:40 UTC1h 50m
2026-07-19 ASA651 - Jul 19, 15:20 UTCJul 19, 17:20 UTC2h 0m
2026-07-19 ASA91 - Jul 19, 04:30 UTCJul 19, 06:25 UTC1h 55m
2026-07-19 ASA665 PDX → ANC Jul 19, 00:45 UTCJul 19, 02:20 UTC1h 35m
2026-07-19 ASA665 PDX → ANC Jul 19, 00:45 UTCJul 19, 02:19 UTC1h 34m
2026-07-18 ASA368 SEA → SLC Jul 18, 22:05 UTCJul 18, 23:40 UTC1h 35m
2026-07-18 ASA664 LAS → SEA Jul 18, 19:05 UTCJul 18, 20:45 UTC1h 40m
2026-07-18 ASA360 SEA → SLC Jul 18, 16:05 UTCJul 18, 17:45 UTC1h 40m
2026-07-18 ASA462 - Jul 18, 06:35 UTCJul 18, 06:40 UTC5m
2026-07-18 ASA462 EWR → SEA Jul 18, 01:08 UTCJul 18, 06:20 UTC5h 12m
2026-07-18 ASA462 - Jul 18, 01:20 UTCJul 18, 06:40 UTC5h 21m
2026-07-17 ASA297 - Jul 17, 16:19 UTCJul 17, 21:10 UTC4h 50m
2026-07-17 ASA1412 - Jul 17, 13:40 UTCJul 17, 14:30 UTC50m
2026-07-17 ASA1412 - Jul 17, 09:30 UTCJul 17, 09:50 UTC20m
2026-07-17 ASA1412 HNL → SAN Jul 17, 09:27 UTCJul 17, 14:26 UTC4h 59m
2026-07-17 ASA94 - Jul 17, 02:39 UTCJul 17, 08:04 UTC5h 25m
2026-07-16 ASA1395 SJD → SAN Jul 16, 22:02 UTCJul 16, 23:48 UTC1h 46m
2026-07-16 ASA1414 SAN → SAN Jul 16, 18:59 UTCJul 16, 23:49 UTC4h 50m
2026-07-16 ASA1557 - Jul 16, 16:09 UTCJul 16, 17:25 UTC1h 15m
2026-07-16 ASA628 SEA → SFO Jul 16, 03:35 UTCJul 16, 06:00 UTC2h 25m
2026-07-15 ASA535 - Jul 15, 23:40 UTCJul 16, 02:10 UTC2h 30m
2026-07-15 ASA535 SEA → DEN Jul 15, 19:40 UTCJul 15, 22:20 UTC2h 40m

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 N731AL page for operator, model, and routing details .

Mode-S A9CECD frequently asked

What is Mode-S code A9CECD?
A9CECD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N731AL.
Where is Mode-S A9CECD registered?
Mode-S code A9CECD 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 A9CECD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9CECD, octal 52347315, decimal 11,128,525.
What flights does A9CECD operate?
Mode-S A9CECD has broadcast 20 distinct callsigns, including ASA62, ASA238, ASA49, ASA50, ASA306.