Apparatus

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sensors Mode-S transponder

A6CA7F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N537AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A6CA7F
Octal
51545177
Decimal
10,930,815
Country
US
Tail
N537AS
Type
B738
No current signal · last broadcast 26d ago
Flights observed
114
Distinct callsigns
20
Country
US
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S A6CA7F.

Country allocation

The ICAO 24-bit address A6CA7F 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
ASA2 Alaska Airlines 5 2026-04-25
ASA15 Alaska Airlines 5 2026-04-18
ASA1497 Alaska Airlines 5 2026-05-01
ASA8 Alaska Airlines 4 2026-04-15
ASA7 Alaska Airlines 4 2026-04-16
ASA735 Alaska Airlines 3 2026-04-16
ASA41 Alaska Airlines 3 2026-04-15
ASA26 Alaska Airlines 3 2026-04-14
ASA1 Alaska Airlines 3 2026-04-26
ASA9421 Alaska Airlines 2 2026-05-03
ASA9 Alaska Airlines 2 2026-04-24
ASA89 Alaska Airlines 2 2026-04-20
ASA787 Alaska Airlines 2 2026-05-02
ASA718 Alaska Airlines 2 2026-04-16
ASA686 Alaska Airlines 2 2026-04-23
ASA68 Alaska Airlines 2 2026-04-19
ASA643 - 2 2026-04-14
ASA488 Alaska Airlines 2 2026-04-22
ASA47 Alaska Airlines 2 2026-04-21
ASA46 Alaska Airlines 2 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-03 ASA9421 SEA → GSO May 3, 20:20 UTCMay 4, 00:50 UTC4h 30m
2026-05-03 ASA9421 SEA → GSO May 3, 20:28 UTCMay 4, 00:44 UTC4h 16m
2026-05-02 ASA787 LAS → SEA May 2, 23:20 UTCMay 3, 04:55 UTC5h 34m
2026-05-02 ASA787 LAS → SEA May 2, 17:05 UTCMay 2, 21:45 UTC4h 40m
2026-05-02 ASA1310 SFO → DAL May 2, 02:55 UTCMay 2, 05:15 UTC2h 20m
2026-05-01 ASA773 EWR → SAN May 1, 23:15 UTCMay 2, 01:40 UTC2h 25m
2026-05-01 ASA1497 SAN → SEA May 1, 21:05 UTCMay 1, 21:45 UTC40m
2026-05-01 ASA1497 SAN → SEA May 1, 19:20 UTCMay 1, 20:05 UTC45m
2026-05-01 ASA762 PDX → PHX May 1, 15:45 UTCMay 1, 17:30 UTC1h 45m
2026-04-30 ASA242 MKE → SEA Apr 30, 23:55 UTCMay 1, 04:45 UTC4h 50m
2026-04-30 ASA258 SEA → LIH Apr 30, 16:15 UTCApr 30, 16:50 UTC35m
2026-04-30 ASA258 SEA → LIH Apr 30, 16:15 UTCApr 30, 21:45 UTC5h 30m
2026-04-30 ASA1320 PDX → ONT Apr 30, 03:00 UTCApr 30, 04:40 UTC1h 40m
2026-04-29 ASA669 RNO → SEA Apr 29, 23:50 UTCApr 30, 01:20 UTC1h 30m
2026-04-29 ASA1322 STS → SEA Apr 29, 20:20 UTCApr 29, 22:00 UTC1h 40m
2026-04-29 ASA1321 SEA → STS Apr 29, 17:25 UTCApr 29, 18:45 UTC1h 20m
2026-04-29 ASA387 MSP → SEA Apr 29, 12:10 UTCApr 29, 15:20 UTC3h 10m
2026-04-29 ASA386 SEA → MSP Apr 29, 01:40 UTCApr 29, 04:34 UTC2h 55m
2026-04-29 ASA386 SEA → MSP Apr 29, 01:39 UTCApr 29, 04:29 UTC2h 50m
2026-04-28 ASA760 SNA → SEA Apr 28, 21:40 UTCApr 29, 00:00 UTC2h 20m
2026-04-28 ASA588 LAS → SFO Apr 28, 18:35 UTCApr 28, 20:35 UTC2h 0m
2026-04-28 ASA399 MCO → SFO Apr 28, 14:10 UTCApr 28, 16:30 UTC2h 20m
2026-04-28 ASA399 MCO → SFO Apr 28, 14:09 UTCApr 28, 16:32 UTC2h 23m
2026-04-27 ASA397 MCO → SAN Apr 27, 23:00 UTCApr 28, 04:20 UTC5h 20m
2026-04-27 ASA441 MSY → SEA Apr 27, 16:20 UTCApr 27, 21:20 UTC5h 0m
2026-04-27 ASA652 RNO → SEA Apr 27, 03:55 UTCApr 27, 06:25 UTC2h 30m
2026-04-26 ASA623 PVR → SFO Apr 26, 23:55 UTCApr 27, 02:15 UTC2h 20m
2026-04-26 ASA1497 SAN → SEA Apr 26, 21:10 UTCApr 26, 21:50 UTC40m
2026-04-26 ASA1497 SAN → SEA Apr 26, 21:11 UTCApr 26, 21:45 UTC34m
2026-04-26 ASA1497 SAN → SEA Apr 26, 19:10 UTCApr 26, 19:55 UTC45m
2026-04-26 ASA1 DCA → SEA Apr 26, 17:35 UTCApr 26, 17:45 UTC10m
2026-04-26 ASA1 DCA → SEA Apr 26, 12:29 UTCApr 26, 17:16 UTC4h 47m
2026-04-26 ASA1 DCA → SEA Apr 26, 12:20 UTCApr 26, 17:45 UTC5h 25m
2026-04-25 ASA2 SEA → DCA Apr 25, 21:11 UTCApr 26, 01:25 UTC4h 14m
2026-04-25 ASA2 SEA → DCA Apr 25, 20:55 UTCApr 26, 01:25 UTC4h 30m
2026-04-25 ASA717 SAN → SFO Apr 25, 16:20 UTCApr 25, 18:30 UTC2h 10m
2026-04-25 ASA1389 SJD → SEA Apr 25, 04:40 UTCApr 25, 06:35 UTC1h 55m
2026-04-24 ASA9 DCA → PDX Apr 24, 21:55 UTCApr 25, 03:00 UTC5h 5m
2026-04-24 ASA9 DCA → PDX Apr 24, 21:55 UTCApr 25, 02:52 UTC4h 57m
2026-04-24 ASA4 SEA → DCA Apr 24, 15:25 UTCApr 24, 20:10 UTC4h 45m
2026-04-24 ASA687 LAS → PDX Apr 24, 03:05 UTCApr 24, 05:05 UTC2h 0m
2026-04-23 ASA686 SFO → LAS Apr 23, 23:00 UTCApr 24, 01:05 UTC2h 5m
2026-04-23 ASA686 SFO → LAS Apr 23, 23:00 UTCApr 24, 00:59 UTC1h 59m
2026-04-23 ASA1378 SFO → MZT Apr 23, 17:40 UTCApr 23, 20:10 UTC2h 30m
2026-04-23 ASA1378 SFO → MZT Apr 23, 17:52 UTCApr 23, 20:04 UTC2h 12m
2026-04-23 ASA1404 SEA → BZE Apr 23, 14:30 UTCApr 23, 16:30 UTC2h 0m
2026-04-23 ASA302 SJC → LIH Apr 23, 09:40 UTCApr 23, 12:45 UTC3h 5m
2026-04-23 ASA46 BET → ANC Apr 23, 04:35 UTCApr 23, 05:20 UTC45m
2026-04-23 ASA46 BET → ANC Apr 23, 04:20 UTCApr 23, 05:16 UTC56m
2026-04-23 ASA45 ANC → BET Apr 23, 02:25 UTCApr 23, 03:10 UTC45m

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 N537AS page for operator, model, and routing details .

Mode-S A6CA7F frequently asked

What is Mode-S code A6CA7F?
A6CA7F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N537AS.
Where is Mode-S A6CA7F registered?
Mode-S code A6CA7F 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 A6CA7F broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6CA7F, octal 51545177, decimal 10,930,815.
What flights does A6CA7F operate?
Mode-S A6CA7F has broadcast 20 distinct callsigns, including ASA2, ASA15, ASA1497, ASA8, ASA7.