Apparatus

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sensors Mode-S transponder

A7AC54

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N594AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A7AC54
Octal
51726124
Decimal
10,988,628
Country
US
Tail
N594AS
Type
B738
Transponder active on ground
Flights observed
338
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S A7AC54.

Country allocation

The ICAO 24-bit address A7AC54 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
ASA208 Alaska Airlines 7 2026-04-16
ASA334 Alaska Airlines 6 2026-07-17
ASA9 - 5 2026-07-10
ASA6 - 5 2026-07-06
ASA549 Alaska Airlines 5 2026-07-22
ASA717 - 4 2026-06-19
ASA64 - 4 2026-06-18
ASA5 - 4 2026-07-07
ASA231 Alaska Airlines 4 2026-06-29
ASA1618 Alaska Airlines 4 2026-06-25
ASA1522 - 4 2026-07-07
ASA1389 - 4 2026-07-18
ASA95 Alaska Airlines 3 2026-05-21
ASA92 Alaska Airlines 3 2026-05-21
ASA91 - 3 2026-07-21
ASA783 Alaska Airlines 3 2026-07-17
ASA780 Alaska Airlines 3 2026-07-23
ASA773 - 3 2026-07-20
ASA691 Alaska Airlines 3 2026-04-17
ASA482 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA630 LAS → SFO Jul 26, 19:45 UTCJul 26, 21:10 UTC1h 25m
2026-07-26 ASA1607 LAX → SFO Jul 26, 17:40 UTCJul 26, 18:30 UTC50m
2026-07-25 ASA534 SFO → AUS Jul 25, 22:52 UTCJul 26, 01:16 UTC2h 24m
2026-07-25 ASA437 CMH → SEA Jul 25, 18:40 UTCJul 26, 01:25 UTC6h 45m
2026-07-25 ASA1611 GEG → LAX Jul 25, 14:15 UTCJul 25, 16:40 UTC2h 25m
2026-07-25 ASA566 FAT → SEA Jul 25, 03:35 UTCJul 25, 05:40 UTC2h 5m
2026-07-24 ASA1638 TPA → SAN Jul 24, 22:00 UTCJul 25, 02:05 UTC4h 5m
2026-07-24 ASA1639 SAN → TPA Jul 24, 16:05 UTCJul 24, 20:30 UTC4h 25m
2026-07-24 ASA1617 DEN → SAN Jul 24, 12:20 UTCJul 24, 14:15 UTC1h 55m
2026-07-24 ASA1619 SAN → DEN Jul 24, 03:35 UTCJul 24, 05:25 UTC1h 50m
2026-07-24 ASA266 SJC → PDX Jul 24, 00:55 UTCJul 24, 01:30 UTC35m
2026-07-23 ASA266 SJC → PDX Jul 23, 20:35 UTCJul 23, 20:45 UTC10m
2026-07-23 ASA266 SJC → PDX Jul 23, 20:35 UTCJul 24, 01:30 UTC4h 55m
2026-07-23 ASA693 PDX → SFO Jul 23, 19:20 UTCJul 23, 19:30 UTC10m
2026-07-23 ASA693 PDX → SFO Jul 23, 14:20 UTCJul 23, 15:00 UTC40m
2026-07-23 ASA291 MCI → SEA Jul 23, 05:40 UTCJul 23, 06:45 UTC1h 5m
2026-07-23 ASA780 SEA → ABQ Jul 23, 01:40 UTCJul 23, 04:00 UTC2h 20m
2026-07-23 ASA780 SEA → ABQ Jul 23, 01:35 UTCJul 23, 04:02 UTC2h 27m
2026-07-23 ASA780 SEA → ABQ Jul 23, 01:20 UTCJul 23, 01:25 UTC5m
2026-07-22 ASA549 ZIH → SFO Jul 22, 20:05 UTCJul 22, 23:30 UTC3h 25m
2026-07-22 ASA549 ZIH → SFO Jul 22, 20:00 UTCJul 22, 23:22 UTC3h 22m
2026-07-22 ASA339 SFO → JFK Jul 22, 00:30 UTCJul 22, 04:10 UTC3h 40m
2026-07-21 ASA604 LAS → LAX Jul 21, 19:40 UTCJul 21, 23:15 UTC3h 35m
2026-07-21 ASA604 LAS → LAX Jul 21, 19:37 UTCJul 21, 23:16 UTC3h 39m
2026-07-21 ASA651 PHX → SEA Jul 21, 15:10 UTCJul 21, 17:15 UTC2h 5m
2026-07-21 ASA91 SEA → SIT Jul 21, 05:33 UTCJul 21, 07:25 UTC1h 52m
2026-07-21 ASA91 - Jul 21, 05:35 UTCJul 21, 07:20 UTC1h 45m
2026-07-21 ASA774 SNA → SEA Jul 21, 01:15 UTCJul 21, 03:25 UTC2h 10m
2026-07-21 ASA774 SNA → SEA Jul 21, 01:10 UTCJul 21, 03:13 UTC2h 3m
2026-07-20 ASA773 - Jul 20, 21:35 UTCJul 20, 23:55 UTC2h 20m
2026-07-20 ASA1311 SEA → SFO Jul 20, 17:35 UTCJul 20, 19:05 UTC1h 30m
2026-07-20 ASA1448 SJC → PVR Jul 20, 14:15 UTCJul 20, 16:05 UTC1h 50m
2026-07-20 ASA550 EWR → SFO Jul 20, 02:20 UTCJul 20, 05:55 UTC3h 35m
2026-07-20 ASA549 ZIH → SFO Jul 20, 00:03 UTCJul 20, 00:27 UTC24m
2026-07-19 ASA549 ZIH → SFO Jul 19, 23:55 UTCJul 20, 00:30 UTC35m
2026-07-19 ASA549 ZIH → SFO Jul 19, 19:40 UTCJul 19, 22:45 UTC3h 5m
2026-07-19 ASA215 AUS → SEA Jul 19, 14:00 UTCJul 19, 17:45 UTC3h 45m
2026-07-19 ASA1370 PVR → SFO Jul 19, 01:05 UTCJul 19, 04:45 UTC3h 40m
2026-07-18 ASA1402 SAN → PDX Jul 18, 21:50 UTCJul 18, 23:28 UTC1h 38m
2026-07-18 ASA1402 - Jul 18, 21:35 UTCJul 18, 23:00 UTC1h 25m
2026-07-18 ASA547 - Jul 18, 19:00 UTCJul 18, 19:30 UTC30m
2026-07-18 ASA547 SJD → SAN Jul 18, 17:40 UTCJul 18, 19:29 UTC1h 49m
2026-07-18 ASA1360 LAX → SJD Jul 18, 14:32 UTCJul 18, 16:21 UTC1h 49m
2026-07-18 ASA1360 - Jul 18, 14:15 UTCJul 18, 15:00 UTC45m
2026-07-18 ASA1389 - Jul 18, 05:20 UTCJul 18, 07:20 UTC2h 0m
2026-07-17 ASA783 ATL → PDX Jul 17, 23:35 UTCJul 18, 04:05 UTC4h 31m
2026-07-17 ASA334 LAX → PDX Jul 17, 21:34 UTCJul 17, 21:55 UTC20m
2026-07-17 ASA334 LAX → PDX Jul 17, 17:18 UTCJul 17, 21:18 UTC4h 0m
2026-07-17 ASA334 LAX → PDX Jul 17, 16:59 UTCJul 17, 21:55 UTC4h 55m
2026-07-17 ASA701 LAS → SEA Jul 17, 13:58 UTCJul 17, 15:27 UTC1h 29m

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 N594AS page for operator, model, and routing details .

Mode-S A7AC54 frequently asked

What is Mode-S code A7AC54?
A7AC54 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N594AS.
Where is Mode-S A7AC54 registered?
Mode-S code A7AC54 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 A7AC54 broadcasting right now?
Mode-S A7AC54 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7AC54, octal 51726124, decimal 10,988,628.
What flights does A7AC54 operate?
Mode-S A7AC54 has broadcast 20 distinct callsigns, including ASA208, ASA334, ASA9, ASA6, ASA549.