Apparatus

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sensors Mode-S transponder

A7B3C2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N596AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A7B3C2
Octal
51731702
Decimal
10,990,530
Country
US
Tail
N596AS
Type
B738
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
341
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A7B3C2.

Country allocation

The ICAO 24-bit address A7B3C2 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
ASA67 - 10 2026-06-29
ASA64 Alaska Airlines 4 2026-06-13
ASA88 - 3 2026-07-14
ASA798 Alaska Airlines 3 2026-06-09
ASA756 - 3 2026-07-22
ASA750 Alaska Airlines 3 2026-07-05
ASA697 Alaska Airlines 3 2026-05-01
ASA654 - 3 2026-07-11
ASA60 Alaska Airlines 3 2026-06-10
ASA6 Alaska Airlines 3 2026-07-23
ASA52 Alaska Airlines 3 2026-05-04
ASA518 Alaska Airlines 3 2026-07-21
ASA493 Alaska Airlines 3 2026-04-24
ASA429 Alaska Airlines 3 2026-06-08
ASA383 - 3 2026-06-25
ASA17 - 3 2026-06-20
ASA1425 Alaska Airlines 3 2026-05-02
ASA1378 Alaska Airlines 3 2026-05-02
ASA1321 Alaska Airlines 3 2026-05-16
ASA1320 Alaska Airlines 3 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA510 PDX → BNA Jul 26, 22:15 UTCJul 26, 22:30 UTC15m
2026-07-26 ASA1429 SJD → SFO Jul 26, 17:45 UTCJul 26, 20:25 UTC2h 40m
2026-07-26 ASA668 DEN → PDX Jul 26, 14:35 UTCJul 26, 16:25 UTC1h 50m
2026-07-26 ASA452 ORD → SFO Jul 26, 12:00 UTCJul 26, 12:45 UTC45m
2026-07-25 ASA476 SEA → LAX Jul 25, 23:25 UTCJul 26, 04:45 UTC5h 20m
2026-07-25 ASA9801 SEA → SFO Jul 25, 15:35 UTCJul 25, 20:15 UTC4h 40m
2026-07-23 ASA6 LAX → DCA Jul 23, 19:05 UTCJul 23, 23:30 UTC4h 25m
2026-07-23 ASA1329 OAK → SEA Jul 23, 16:10 UTCJul 23, 17:10 UTC1h 0m
2026-07-23 ASA1329 OAK → SEA Jul 23, 16:09 UTCJul 23, 17:01 UTC52m
2026-07-23 ASA1625 LAX → SFO Jul 23, 13:25 UTCJul 23, 14:25 UTC1h 0m
2026-07-23 ASA278 FAI → ANC Jul 23, 01:10 UTCJul 23, 03:15 UTC2h 5m
2026-07-22 ASA756 LAS → PDX Jul 22, 21:30 UTCJul 22, 23:20 UTC1h 50m
2026-07-22 ASA756 LAS → PDX Jul 22, 21:28 UTCJul 22, 23:14 UTC1h 46m
2026-07-22 ASA757 PDX → LAS Jul 22, 18:00 UTCJul 22, 19:55 UTC1h 55m
2026-07-22 ASA1410 - Jul 22, 14:40 UTCJul 22, 15:50 UTC1h 10m
2026-07-22 ASA788 KOA → SFO Jul 22, 02:15 UTCJul 22, 02:30 UTC15m
2026-07-21 ASA258 - Jul 21, 19:00 UTCJul 22, 00:35 UTC5h 35m
2026-07-21 ASA1325 - Jul 21, 14:10 UTCJul 21, 16:15 UTC2h 5m
2026-07-21 ASA518 SEA → SLC Jul 21, 03:19 UTCJul 21, 05:05 UTC1h 46m
2026-07-21 ASA518 SEA → SLC Jul 21, 03:05 UTCJul 21, 05:10 UTC2h 5m
2026-07-20 ASA1369 - Jul 20, 20:35 UTCJul 21, 01:40 UTC5h 5m
2026-07-20 ASA374 SJD → SJC Jul 20, 14:40 UTCJul 20, 18:55 UTC4h 15m
2026-07-20 ASA1519 ANC → FAI Jul 20, 01:20 UTCJul 20, 04:30 UTC3h 10m
2026-07-19 ASA1525 MCO → SEA Jul 19, 21:20 UTCJul 20, 00:00 UTC2h 40m
2026-07-19 ASA1405 BZE → SEA Jul 19, 18:15 UTCJul 19, 20:05 UTC1h 50m
2026-07-19 ASA1405 BZE → SEA Jul 19, 18:12 UTCJul 19, 20:09 UTC1h 57m
2026-07-19 ASA699 SEA → SNA Jul 19, 14:24 UTCJul 19, 16:43 UTC2h 19m
2026-07-19 ASA699 - Jul 19, 14:20 UTCJul 19, 16:50 UTC2h 30m
2026-07-19 ASA54 - Jul 19, 09:55 UTCJul 19, 12:50 UTC2h 55m
2026-07-19 ASA1320 PDX → ONT Jul 19, 01:50 UTCJul 19, 06:55 UTC5h 5m
2026-07-19 ASA1320 PDX → ONT Jul 19, 01:50 UTCJul 19, 06:51 UTC5h 1m
2026-07-18 ASA1320 PDX → ONT Jul 18, 19:40 UTCJul 19, 00:25 UTC4h 45m
2026-07-18 ASA79 SEA → ANC Jul 18, 14:50 UTCJul 18, 18:10 UTC3h 20m
2026-07-17 ASA234 FAI → SEA Jul 17, 23:00 UTCJul 18, 04:15 UTC5h 16m
2026-07-17 ASA220 SAN → LIH Jul 17, 15:35 UTCJul 17, 21:03 UTC5h 28m
2026-07-17 ASA220 - Jul 17, 15:15 UTCJul 17, 15:55 UTC40m
2026-07-17 ASA780 DFW → SAN Jul 17, 05:10 UTCJul 17, 07:40 UTC2h 30m
2026-07-16 ASA549 ZIH → SFO Jul 16, 23:59 UTCJul 17, 03:15 UTC3h 16m
2026-07-16 ASA549 ZIH → SFO Jul 16, 23:59 UTCJul 17, 03:30 UTC3h 30m
2026-07-16 ASA702 - Jul 16, 15:19 UTCJul 16, 17:35 UTC2h 15m
2026-07-16 ASA702 SNA → SEA Jul 16, 15:27 UTCJul 16, 17:16 UTC1h 49m
2026-07-16 ASA472 SEA → SNA Jul 16, 00:48 UTCJul 16, 03:02 UTC2h 14m
2026-07-16 ASA472 - Jul 16, 00:30 UTCJul 16, 03:05 UTC2h 35m
2026-07-15 ASA332 ANC → SEA Jul 15, 19:47 UTCJul 15, 22:28 UTC2h 41m
2026-07-15 ASA332 - Jul 15, 19:40 UTCJul 15, 22:45 UTC3h 5m
2026-07-15 ASA232 - Jul 15, 17:25 UTCJul 15, 18:15 UTC50m
2026-07-15 ASA231 - Jul 15, 15:40 UTCJul 15, 16:25 UTC45m
2026-07-15 ASA1363 SEA → ANC Jul 15, 07:10 UTCJul 15, 10:20 UTC3h 10m
2026-07-15 ASA1363 SEA → ANC Jul 15, 07:06 UTCJul 15, 10:16 UTC3h 10m
2026-07-15 ASA400 SBA → SEA Jul 15, 02:45 UTCJul 15, 04:35 UTC1h 50m

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 N596AS page for operator, model, and routing details .

Mode-S A7B3C2 frequently asked

What is Mode-S code A7B3C2?
A7B3C2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N596AS.
Where is Mode-S A7B3C2 registered?
Mode-S code A7B3C2 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 A7B3C2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7B3C2, octal 51731702, decimal 10,990,530.
What flights does A7B3C2 operate?
Mode-S A7B3C2 has broadcast 20 distinct callsigns, including ASA67, ASA64, ASA88, ASA798, ASA756.