Apparatus

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sensors Mode-S transponder

ACA948

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N915AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
ACA948
Octal
53124510
Decimal
11,315,528
Country
US
Tail
N915AK
Type
B39M
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
459
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S ACA948.

Country allocation

The ICAO 24-bit address ACA948 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
ASA1345 - 7 2026-07-13
ASA572 Alaska Airlines 6 2026-06-09
ASA396 Alaska Airlines 6 2026-06-24
ASA625 Alaska Airlines 5 2026-07-19
ASA299 - 5 2026-07-15
ASA21 - 5 2026-06-22
ASA1381 - 5 2026-07-15
ASA738 Alaska Airlines 4 2026-06-30
ASA638 - 4 2026-07-16
ASA577 Alaska Airlines 4 2026-06-18
ASA574 Alaska Airlines 4 2026-06-01
ASA424 Alaska Airlines 4 2026-04-23
ASA305 Alaska Airlines 4 2026-06-06
ASA205 Alaska Airlines 4 2026-05-29
ASA204 - 4 2026-07-12
ASA202 Alaska Airlines 4 2026-07-21
ASA1483 Alaska Airlines 4 2026-06-05
ASA1346 - 4 2026-07-15
ASA1339 Alaska Airlines 4 2026-06-02
ASA795 - 3 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA391 SAN → PDX Jul 26, 21:20 UTCJul 26, 22:00 UTC40m
2026-07-26 ASA385 BOS → SEA Jul 26, 15:50 UTCJul 26, 19:40 UTC3h 50m
2026-07-26 ASA279 SEA → BUR Jul 26, 13:25 UTCJul 26, 14:10 UTC45m
2026-07-26 ASA1342 PVR → SFO Jul 26, 03:30 UTCJul 26, 04:05 UTC35m
2026-07-26 ASA1342 PVR → SFO Jul 26, 03:25 UTCJul 26, 03:57 UTC32m
2026-07-25 ASA508 CVG → SEA Jul 25, 21:20 UTCJul 26, 01:55 UTC4h 35m
2026-07-25 ASA508 CVG → SEA Jul 25, 16:00 UTCJul 25, 19:30 UTC3h 30m
2026-07-25 ASA17 JFK → SEA Jul 25, 01:15 UTCJul 25, 06:45 UTC5h 30m
2026-07-24 ASA18 PDX → JFK Jul 24, 18:35 UTCJul 24, 23:05 UTC4h 30m
2026-07-24 ASA413 SFO → LAS Jul 24, 13:10 UTCJul 24, 17:00 UTC3h 50m
2026-07-24 ASA328 SEA → ORD Jul 24, 07:35 UTCJul 24, 10:55 UTC3h 20m
2026-07-24 ASA1681 LAS → SEA Jul 24, 03:45 UTCJul 24, 05:50 UTC2h 5m
2026-07-24 ASA1681 LAS → SEA Jul 24, 03:30 UTCJul 24, 05:34 UTC2h 4m
2026-07-23 ASA600 PDX → SFO Jul 23, 23:10 UTCJul 24, 01:15 UTC2h 5m
2026-07-23 ASA603 SAN → PDX Jul 23, 19:10 UTCJul 23, 21:40 UTC2h 30m
2026-07-23 ASA606 SEA → PHX Jul 23, 15:30 UTCJul 23, 17:55 UTC2h 25m
2026-07-21 ASA202 SEA → SNA Jul 21, 02:27 UTCJul 21, 03:03 UTC36m
2026-07-21 ASA202 SEA → SNA Jul 21, 02:20 UTCJul 21, 03:10 UTC50m
2026-07-20 ASA402 ANC → SEA Jul 20, 21:15 UTCJul 21, 00:25 UTC3h 10m
2026-07-20 ASA53 EWR → PDX Jul 20, 14:50 UTCJul 20, 19:25 UTC4h 35m
2026-07-20 ASA287 EWR → LAX Jul 20, 01:38 UTCJul 20, 06:46 UTC5h 8m
2026-07-20 ASA287 - Jul 20, 02:00 UTCJul 20, 06:00 UTC4h 0m
2026-07-19 ASA477 SEA → EWR Jul 19, 17:45 UTCJul 19, 22:00 UTC4h 15m
2026-07-19 ASA625 PHX → SEA Jul 19, 11:20 UTCJul 19, 15:20 UTC4h 0m
2026-07-19 ASA624 SEA → IND Jul 19, 06:00 UTCJul 19, 09:25 UTC3h 25m
2026-07-19 ASA758 SFO → SEA Jul 19, 01:50 UTCJul 19, 03:15 UTC1h 25m
2026-07-18 ASA236 SFO → LAS Jul 18, 23:10 UTCJul 19, 00:30 UTC1h 20m
2026-07-18 ASA576 - Jul 18, 19:10 UTCJul 18, 21:05 UTC1h 55m
2026-07-18 ASA9800 DCA → SFO Jul 18, 15:30 UTCJul 18, 17:55 UTC2h 25m
2026-07-18 ASA423 SEA → SAT Jul 18, 12:30 UTCJul 18, 13:30 UTC1h 0m
2026-07-18 ASA1524 DTW → SEA Jul 18, 05:40 UTCJul 18, 06:30 UTC50m
2026-07-18 ASA1524 DTW → SEA Jul 18, 05:38 UTCJul 18, 06:28 UTC50m
2026-07-18 ASA662 PHX → PDX Jul 18, 01:54 UTCJul 18, 04:15 UTC2h 21m
2026-07-17 ASA700 SEA → PHX Jul 17, 21:34 UTCJul 18, 00:29 UTC2h 55m
2026-07-17 ASA765 ANC → SEA Jul 17, 16:15 UTCJul 17, 19:20 UTC3h 5m
2026-07-17 ASA663 SEA → ANC Jul 17, 04:07 UTCJul 17, 06:53 UTC2h 46m
2026-07-17 ASA663 SEA → ANC Jul 17, 03:55 UTCJul 17, 07:05 UTC3h 10m
2026-07-17 ASA521 SJC → SEA Jul 17, 00:45 UTCJul 17, 02:25 UTC1h 40m
2026-07-16 ASA335 SEA → SJC Jul 16, 21:45 UTCJul 16, 23:35 UTC1h 50m
2026-07-16 ASA795 SMF → SEA Jul 16, 15:19 UTCJul 16, 16:55 UTC1h 35m
2026-07-16 ASA638 SEA → OVE Jul 16, 02:40 UTCJul 16, 04:00 UTC1h 20m
2026-07-16 ASA638 SEA → SMF Jul 16, 02:39 UTCJul 16, 04:10 UTC1h 31m
2026-07-15 ASA1381 SAN → SEA Jul 15, 22:50 UTCJul 16, 00:39 UTC1h 49m
2026-07-15 ASA1381 - Jul 15, 22:30 UTCJul 16, 00:40 UTC2h 10m
2026-07-15 ASA1346 SEA → SAN Jul 15, 18:50 UTCJul 15, 21:25 UTC2h 35m
2026-07-15 ASA299 EWR → SEA Jul 15, 11:40 UTCJul 15, 16:50 UTC5h 10m
2026-07-15 ASA1631 PDX → EWR Jul 15, 04:47 UTCJul 15, 09:11 UTC4h 24m
2026-07-15 ASA1631 PDX → EWR Jul 15, 04:50 UTCJul 15, 09:25 UTC4h 35m
2026-07-15 ASA253 - Jul 15, 02:30 UTCJul 15, 03:25 UTC55m
2026-07-14 ASA253 - Jul 14, 22:00 UTCJul 14, 22:25 UTC25m

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 N915AK page for operator, model, and routing details .

Mode-S ACA948 frequently asked

What is Mode-S code ACA948?
ACA948 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N915AK.
Where is Mode-S ACA948 registered?
Mode-S code ACA948 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 ACA948 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACA948, octal 53124510, decimal 11,315,528.
What flights does ACA948 operate?
Mode-S ACA948 has broadcast 20 distinct callsigns, including ASA1345, ASA572, ASA396, ASA625, ASA299.