Apparatus

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sensors Mode-S transponder

AC7A5B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N903AK · BOEING 737 MAX 9 · operated by ALASKA AIRLINES INC

Hex
AC7A5B
Octal
53075133
Decimal
11,303,515
Country
US
Tail
N903AK
Type
B39M
No current signal · last broadcast 7h ago
Flights observed
337
Distinct callsigns
20
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S AC7A5B.

Country allocation

The ICAO 24-bit address AC7A5B 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
ASA786 - 6 2026-06-23
ASA507 Alaska Airlines 6 2026-05-14
ASA50 Alaska Airlines 6 2026-06-04
ASA299 Alaska Airlines 6 2026-05-08
ASA49 Alaska Airlines 5 2026-06-04
ASA272 Alaska Airlines 5 2026-05-31
ASA238 - 5 2026-06-26
ASA1421 - 5 2026-06-24
ASA781 - 4 2026-06-23
ASA650 Alaska Airlines 4 2026-05-10
ASA596 Alaska Airlines 4 2026-05-21
ASA561 Alaska Airlines 4 2026-06-01
ASA429 Alaska Airlines 4 2026-06-15
ASA274 Alaska Airlines 4 2026-06-05
ASA1493 Alaska Airlines 4 2026-04-18
ASA1365 Alaska Airlines 4 2026-06-10
ASA12 Alaska Airlines 4 2026-05-30
ASA90 Alaska Airlines 3 2026-06-11
ASA622 Alaska Airlines 3 2026-05-10
ASA60 Alaska Airlines 3 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ASA9433 - Jul 13, 18:10 UTCJul 13, 23:15 UTC5h 5m
2026-07-13 ASA9433 GSO → SEA Jul 13, 18:10 UTCJul 13, 22:56 UTC4h 46m
2026-06-27 ASA9423 - Jun 27, 18:15 UTCJun 27, 22:49 UTC4h 35m
2026-06-27 ASA9423 SEA → GSO Jun 27, 18:11 UTCJun 27, 22:41 UTC4h 30m
2026-06-26 ASA517 - Jun 26, 22:44 UTCJun 27, 04:29 UTC5h 45m
2026-06-26 ASA516 SEA → FLL Jun 26, 15:49 UTCJun 26, 21:15 UTC5h 25m
2026-06-26 ASA259 KOA → SEA Jun 26, 07:45 UTCJun 26, 13:10 UTC5h 25m
2026-06-26 ASA238 - Jun 26, 04:50 UTCJun 26, 05:05 UTC15m
2026-06-25 ASA238 - Jun 25, 23:34 UTCJun 26, 00:39 UTC1h 5m
2026-06-25 ASA603 - Jun 25, 18:39 UTCJun 25, 21:10 UTC2h 30m
2026-06-25 ASA746 PDX → PHX Jun 25, 01:24 UTCJun 25, 03:44 UTC2h 20m
2026-06-24 ASA325 - Jun 24, 19:49 UTCJun 25, 00:05 UTC4h 15m
2026-06-24 ASA324 PDX → ORD Jun 24, 14:29 UTCJun 24, 18:09 UTC3h 40m
2026-06-24 ASA1421 IAH → PDX Jun 24, 00:30 UTCJun 24, 04:01 UTC3h 31m
2026-06-24 ASA1421 - Jun 24, 00:09 UTCJun 24, 04:10 UTC4h 0m
2026-06-23 ASA438 SEA → IAH Jun 23, 18:55 UTCJun 23, 22:49 UTC3h 55m
2026-06-23 ASA786 - Jun 23, 16:39 UTCJun 23, 16:44 UTC5m
2026-06-23 ASA786 BWI → SEA Jun 23, 11:29 UTCJun 23, 16:23 UTC4h 54m
2026-06-23 ASA786 BWI → SEA Jun 23, 11:19 UTCJun 23, 16:44 UTC5h 25m
2026-06-23 ASA781 SEA → BWI Jun 23, 05:09 UTCJun 23, 09:34 UTC4h 25m
2026-06-23 ASA575 ONT → SEA Jun 23, 01:10 UTCJun 23, 03:20 UTC2h 10m
2026-06-22 ASA571 MCO → SAN Jun 22, 21:49 UTCJun 23, 00:00 UTC2h 10m
2026-06-22 ASA571 MCO → SAN Jun 22, 21:49 UTCJun 22, 23:57 UTC2h 8m
2026-06-22 ASA656 - Jun 22, 18:40 UTCJun 22, 20:14 UTC1h 35m
2026-06-22 ASA725 LAS → PDX Jun 22, 15:35 UTCJun 22, 17:15 UTC1h 40m
2026-06-22 ASA259 KOA → SEA Jun 22, 07:19 UTCJun 22, 12:25 UTC5h 5m
2026-06-22 ASA238 - Jun 22, 04:34 UTCJun 22, 04:49 UTC15m
2026-06-21 ASA238 SEA → KOA Jun 21, 23:27 UTCJun 22, 04:52 UTC5h 25m
2026-06-21 ASA238 - Jun 21, 23:24 UTCJun 22, 00:14 UTC50m
2026-06-21 ASA785 LAS → SEA Jun 21, 19:00 UTCJun 21, 20:50 UTC1h 50m
2026-06-21 ASA612 SEA → LAS Jun 21, 15:09 UTCJun 21, 17:05 UTC1h 55m
2026-06-21 ASA749 LAS → SEA Jun 21, 04:24 UTCJun 21, 06:29 UTC2h 5m
2026-06-21 ASA531 PDX → LAS Jun 21, 01:14 UTCJun 21, 03:05 UTC1h 50m
2026-06-20 ASA1633 SJC → PDX Jun 20, 21:40 UTCJun 20, 23:04 UTC1h 25m
2026-06-20 ASA1632 PDX → SJC Jun 20, 18:54 UTCJun 20, 20:20 UTC1h 25m
2026-06-20 ASA311 SEA → SFO Jun 20, 10:25 UTCJun 20, 16:00 UTC5h 35m
2026-06-20 ASA311 SEA → SFO Jun 20, 10:23 UTCJun 20, 15:58 UTC5h 35m
2026-06-19 ASA460 SEA → BOS Jun 19, 23:09 UTCJun 20, 03:54 UTC4h 45m
2026-06-19 ASA676 LAS → SEA Jun 19, 19:34 UTCJun 19, 21:34 UTC2h 0m
2026-06-19 ASA1628 PDX → LAS Jun 19, 16:09 UTCJun 19, 17:59 UTC1h 50m
2026-06-19 ASA1628 PDX → LAS Jun 19, 16:07 UTCJun 19, 17:54 UTC1h 47m
2026-06-18 ASA1490 - Jun 18, 14:20 UTCJun 19, 02:19 UTC11h 59m
2026-06-18 ASA1520 - Jun 18, 08:50 UTCJun 18, 12:05 UTC3h 15m
2026-06-18 ASA1549 SEA → FAI Jun 18, 03:55 UTCJun 18, 07:15 UTC3h 20m
2026-06-17 ASA313 SEA → DTW Jun 17, 21:50 UTCJun 18, 02:20 UTC4h 30m
2026-06-17 ASA313 SEA → DTW Jun 17, 16:45 UTCJun 17, 20:10 UTC3h 25m
2026-06-17 ASA491 RDU → SEA Jun 17, 13:35 UTCJun 17, 15:15 UTC1h 40m
2026-06-17 ASA706 SEA → OAK Jun 17, 00:45 UTCJun 17, 02:25 UTC1h 40m
2026-06-16 ASA286 SEA → SEA Jun 16, 19:00 UTCJun 16, 22:55 UTC3h 56m
2026-06-16 ASA277 BUR → SEA Jun 16, 11:45 UTCJun 16, 17:30 UTC5h 45m

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 N903AK page for operator, model, and routing details .

Mode-S AC7A5B frequently asked

What is Mode-S code AC7A5B?
AC7A5B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N903AK.
Where is Mode-S AC7A5B registered?
Mode-S code AC7A5B 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 AC7A5B broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC7A5B, octal 53075133, decimal 11,303,515.
What flights does AC7A5B operate?
Mode-S AC7A5B has broadcast 20 distinct callsigns, including ASA786, ASA507, ASA50, ASA299, ASA49.