Apparatus

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sensors Mode-S transponder

AC9E23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N912AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
AC9E23
Octal
53117043
Decimal
11,312,675
Country
US
Tail
N912AK
Type
B39M
No current signal · last broadcast 19d ago
Flights observed
323
Distinct callsigns
20
Country
US
Last broadcast
19d ago

Last known position

Most recent position reported by Mode-S AC9E23.

Country allocation

The ICAO 24-bit address AC9E23 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
ASA50 Alaska Airlines 6 2026-05-06
ASA12 Alaska Airlines 6 2026-06-07
ASA459 - 5 2026-06-16
ASA34 Alaska Airlines 5 2026-04-20
ASA647 Alaska Airlines 4 2026-06-17
ASA436 Alaska Airlines 4 2026-04-17
ASA405 Alaska Airlines 4 2026-04-15
ASA240 Alaska Airlines 4 2026-05-25
ASA782 Alaska Airlines 3 2026-05-10
ASA705 Alaska Airlines 3 2026-04-29
ASA605 Alaska Airlines 3 2026-05-17
ASA522 Alaska Airlines 3 2026-04-16
ASA415 Alaska Airlines 3 2026-05-05
ASA414 Alaska Airlines 3 2026-05-05
ASA38 Alaska Airlines 3 2026-04-17
ASA354 Alaska Airlines 3 2026-05-13
ASA314 Alaska Airlines 3 2026-04-28
ASA293 Alaska Airlines 3 2026-06-10
ASA280 Alaska Airlines 3 2026-04-13
ASA253 Alaska Airlines 3 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-24 ASA9420 - Jun 24, 17:40 UTCJun 24, 22:00 UTC4h 20m
2026-06-24 ASA519 - Jun 24, 12:20 UTCJun 24, 16:14 UTC3h 55m
2026-06-24 ASA520 - Jun 24, 06:20 UTCJun 24, 09:45 UTC3h 25m
2026-06-24 ASA1368 - Jun 24, 02:20 UTCJun 24, 04:34 UTC2h 15m
2026-06-23 ASA1406 - Jun 23, 23:05 UTCJun 24, 00:20 UTC1h 15m
2026-06-23 ASA1360 LAX → SJD Jun 23, 18:50 UTCJun 23, 20:44 UTC1h 54m
2026-06-23 ASA717 - Jun 23, 14:35 UTCJun 23, 16:50 UTC2h 15m
2026-06-23 ASA495 - Jun 23, 04:35 UTCJun 23, 06:39 UTC2h 5m
2026-06-23 ASA492 SEA → LAX Jun 23, 00:35 UTCJun 23, 02:55 UTC2h 20m
2026-06-22 ASA580 BUR → SEA Jun 22, 20:39 UTCJun 22, 22:40 UTC2h 0m
2026-06-22 ASA426 SEA → BUR Jun 22, 17:10 UTCJun 22, 19:19 UTC2h 10m
2026-06-22 ASA453 - Jun 22, 11:14 UTCJun 22, 15:24 UTC4h 10m
2026-06-22 ASA1579 SEA → IAH Jun 22, 01:05 UTCJun 22, 04:34 UTC3h 30m
2026-06-21 ASA580 BUR → SEA Jun 21, 20:40 UTCJun 21, 22:49 UTC2h 10m
2026-06-21 ASA426 SEA → BUR Jun 21, 16:49 UTCJun 21, 18:54 UTC2h 5m
2026-06-21 ASA387 MSP → SEA Jun 21, 11:20 UTCJun 21, 14:34 UTC3h 15m
2026-06-20 ASA527 SNA → SEA Jun 20, 20:59 UTCJun 20, 23:42 UTC2h 43m
2026-06-20 ASA623 - Jun 20, 14:39 UTCJun 20, 19:19 UTC4h 40m
2026-06-20 ASA416 SFO → DAL Jun 20, 00:49 UTCJun 20, 04:29 UTC3h 40m
2026-06-19 ASA790 SEA → EWR Jun 19, 23:39 UTCJun 20, 00:04 UTC25m
2026-06-19 ASA790 SEA → EWR Jun 19, 21:44 UTCJun 19, 23:25 UTC1h 40m
2026-06-19 ASA570 LAS → SFO Jun 19, 17:49 UTCJun 19, 18:59 UTC1h 10m
2026-06-19 ASA718 - Jun 19, 14:39 UTCJun 19, 15:49 UTC1h 10m
2026-06-19 ASA718 SFO → LAS Jun 19, 14:52 UTCJun 19, 15:38 UTC46m
2026-06-19 ASA1601 LAX → SFO Jun 19, 05:30 UTCJun 19, 06:24 UTC55m
2026-06-18 ASA546 - Jun 18, 19:40 UTCJun 19, 01:04 UTC5h 24m
2026-06-18 ASA673 GEG → SAN Jun 18, 15:25 UTCJun 18, 17:35 UTC2h 10m
2026-06-18 ASA1342 PVR → SFO Jun 18, 03:10 UTCJun 18, 03:45 UTC35m
2026-06-18 ASA1342 PVR → SFO Jun 18, 03:18 UTCJun 18, 03:39 UTC21m
2026-06-17 ASA503 LAX → SEA Jun 17, 21:35 UTCJun 18, 01:20 UTC3h 45m
2026-06-17 ASA422 SEA → AUS Jun 17, 16:25 UTCJun 17, 19:55 UTC3h 30m
2026-06-17 ASA647 LAS → PDX Jun 17, 01:00 UTCJun 17, 05:05 UTC4h 5m
2026-06-16 ASA647 LAS → PDX Jun 16, 20:30 UTCJun 16, 23:35 UTC3h 5m
2026-06-16 ASA459 BOS → SEA Jun 16, 11:25 UTCJun 16, 17:00 UTC5h 35m
2026-06-16 ASA255 CLE → SEA Jun 16, 04:25 UTCJun 16, 09:04 UTC4h 40m
2026-06-15 ASA389 BOS → SAN Jun 15, 20:59 UTCJun 16, 02:45 UTC5h 45m
2026-06-15 ASA358 PDX → BOS Jun 15, 14:30 UTCJun 15, 19:25 UTC4h 55m
2026-06-15 ASA1566 BOI → PDX Jun 15, 12:10 UTCJun 15, 13:05 UTC55m
2026-06-15 ASA1524 DTW → SEA Jun 15, 05:20 UTCJun 15, 06:15 UTC55m
2026-06-15 ASA525 LAX → SEA Jun 15, 02:35 UTCJun 15, 03:55 UTC1h 20m
2026-06-15 ASA1610 - Jun 15, 00:20 UTCJun 15, 01:20 UTC1h 0m
2026-06-14 ASA487 - Jun 14, 18:40 UTCJun 14, 20:50 UTC2h 10m
2026-06-14 ASA670 PDX → LAS Jun 14, 11:15 UTCJun 14, 16:35 UTC5h 20m
2026-06-14 ASA677 SEA → RDU Jun 14, 05:01 UTCJun 14, 09:20 UTC4h 19m
2026-06-14 ASA677 SEA → RDU Jun 14, 04:55 UTCJun 14, 09:25 UTC4h 30m
2026-06-14 ASA1508 FAI → SEA Jun 14, 00:05 UTCJun 14, 03:15 UTC3h 10m
2026-06-14 ASA1508 FAI → SEA Jun 14, 00:01 UTCJun 14, 02:58 UTC2h 57m
2026-06-13 ASA1507 - Jun 13, 19:35 UTCJun 13, 22:55 UTC3h 20m
2026-06-13 ASA614 LAX → SEA Jun 13, 03:25 UTCJun 13, 05:35 UTC2h 9m
2026-06-12 ASA1300 SJC → SEA Jun 12, 23:30 UTCJun 13, 01:40 UTC2h 10m

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 N912AK page for operator, model, and routing details .

Mode-S AC9E23 frequently asked

What is Mode-S code AC9E23?
AC9E23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N912AK.
Where is Mode-S AC9E23 registered?
Mode-S code AC9E23 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 AC9E23 broadcasting right now?
No active broadcast right now. Last signal was 19d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC9E23, octal 53117043, decimal 11,312,675.
What flights does AC9E23 operate?
Mode-S AC9E23 has broadcast 20 distinct callsigns, including ASA50, ASA12, ASA459, ASA34, ASA647.