Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A715C6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N556AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A715C6
Octal
51612706
Decimal
10,950,086
Country
US
Tail
N556AS
Type
B738
No current signal · last broadcast Jul 26, 19:15 UTC
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:15 UTC

Last known position

Most recent position reported by Mode-S A715C6.

Country allocation

The ICAO 24-bit address A715C6 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
ASA46 Alaska Airlines 8 2026-06-01
ASA760 - 6 2026-06-24
ASA494 Alaska Airlines 6 2026-04-16
ASA766 Alaska Airlines 5 2026-05-21
ASA45 Alaska Airlines 5 2026-06-01
ASA230 Alaska Airlines 5 2026-07-24
ASA89 Alaska Airlines 4 2026-05-31
ASA759 Alaska Airlines 4 2026-05-28
ASA709 Alaska Airlines 4 2026-05-08
ASA699 Alaska Airlines 4 2026-06-15
ASA645 Alaska Airlines 4 2026-04-13
ASA64 Alaska Airlines 4 2026-06-02
ASA634 Alaska Airlines 4 2026-05-27
ASA629 Alaska Airlines 4 2026-05-09
ASA588 - 4 2026-07-16
ASA542 Alaska Airlines 4 2026-05-21
ASA431 - 4 2026-06-29
ASA415 Alaska Airlines 4 2026-05-25
ASA350 - 4 2026-06-19
ASA317 Alaska Airlines 4 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA570 SAN → SEA Jul 26, 17:55 UTCJul 26, 19:10 UTC1h 15m
2026-07-26 ASA718 LAS → SFO Jul 26, 15:30 UTCJul 26, 16:35 UTC1h 5m
2026-07-26 ASA791 EWR → SEA Jul 26, 01:20 UTCJul 26, 03:15 UTC1h 55m
2026-07-25 ASA579 SAN → SEA Jul 25, 18:15 UTCJul 25, 22:20 UTC4h 5m
2026-07-25 ASA578 LAX → PDX Jul 25, 13:15 UTCJul 25, 16:30 UTC3h 15m
2026-07-25 445 - Jul 25, 05:00 UTCJul 25, 06:55 UTC1h 55m
2026-07-25 689 - Jul 25, 02:55 UTCJul 25, 03:05 UTC10m
2026-07-25 690 - Jul 25, 01:05 UTCJul 25, 01:15 UTC10m
2026-07-24 ASA435 SEA → SFO Jul 24, 21:50 UTCJul 24, 23:45 UTC1h 55m
2026-07-24 ASA230 SMF → SEA Jul 24, 13:50 UTCJul 24, 19:20 UTC5h 30m
2026-07-24 ASA314 PDX → SFO Jul 24, 06:05 UTCJul 24, 10:25 UTC4h 20m
2026-07-23 ASA521 AUS → SEA Jul 23, 22:35 UTCJul 24, 00:20 UTC1h 45m
2026-07-23 ASA521 AUS → SEA Jul 23, 22:00 UTCJul 24, 00:06 UTC2h 6m
2026-07-23 ASA335 SJC → SAN Jul 23, 18:35 UTCJul 23, 20:30 UTC1h 55m
2026-07-23 ASA21 JFK → SEA Jul 23, 11:20 UTCJul 23, 17:00 UTC5h 40m
2026-07-22 ASA36 SAN → JFK Jul 22, 21:30 UTCJul 23, 02:30 UTC5h 0m
2026-07-22 ASA1618 SAN → DEN Jul 22, 17:45 UTCJul 22, 19:45 UTC2h 0m
2026-07-22 ASA1618 SAN → DEN Jul 22, 14:10 UTCJul 22, 16:05 UTC1h 55m
2026-07-22 ASA336 PDX → FLL Jul 22, 02:35 UTCJul 22, 05:05 UTC2h 30m
2026-07-22 ASA336 PDX → FLL Jul 22, 02:30 UTCJul 22, 04:58 UTC2h 28m
2026-07-21 ASA1340 SJC → GDL Jul 21, 23:35 UTCJul 22, 01:00 UTC1h 25m
2026-07-21 ASA1522 SAN → SEA Jul 21, 21:20 UTCJul 21, 22:15 UTC55m
2026-07-21 ASA581 SEA → PSP Jul 21, 14:40 UTCJul 21, 16:35 UTC1h 55m
2026-07-21 ASA779 LAS → PDX Jul 21, 01:50 UTCJul 21, 03:40 UTC1h 50m
2026-07-20 ASA776 LAS → SFO Jul 20, 23:10 UTCJul 21, 00:25 UTC1h 15m
2026-07-20 ASA9804 SEA → SFO Jul 20, 20:45 UTCJul 20, 21:40 UTC55m
2026-07-20 ASA717 SAN → SFO Jul 20, 14:40 UTCJul 20, 17:00 UTC2h 20m
2026-07-20 ASA329 ORD → SEA Jul 20, 02:25 UTCJul 20, 06:30 UTC4h 5m
2026-07-20 ASA329 ORD → SEA Jul 20, 02:24 UTCJul 20, 06:14 UTC3h 50m
2026-07-19 ASA410 - Jul 19, 20:25 UTCJul 19, 23:40 UTC3h 15m
2026-07-19 ASA365 DFW → SEA Jul 19, 14:15 UTCJul 19, 18:10 UTC3h 55m
2026-07-19 ASA424 SEA → DFW Jul 19, 01:20 UTCJul 19, 04:45 UTC3h 25m
2026-07-18 ASA330 ABQ → SEA Jul 18, 20:55 UTCJul 18, 23:30 UTC2h 35m
2026-07-18 ASA327 SEA → ABQ Jul 18, 17:15 UTCJul 18, 19:45 UTC2h 30m
2026-07-18 ASA1365 - Jul 18, 13:25 UTCJul 18, 15:25 UTC2h 0m
2026-07-18 ASA1365 LAX → SEA Jul 18, 13:23 UTCJul 18, 15:18 UTC1h 55m
2026-07-18 ASA1390 SEA → LAX Jul 18, 04:46 UTCJul 18, 06:56 UTC2h 10m
2026-07-18 ASA1390 - Jul 18, 04:35 UTCJul 18, 06:55 UTC2h 20m
2026-07-17 ASA510 MSP → SEA Jul 17, 22:10 UTCJul 18, 01:20 UTC3h 10m
2026-07-17 ASA1429 SJD → SFO Jul 17, 17:50 UTCJul 17, 20:40 UTC2h 50m
2026-07-17 ASA562 BUR → PDX Jul 17, 14:24 UTCJul 17, 16:10 UTC1h 45m
2026-07-17 ASA559 PDX → BUR Jul 17, 01:05 UTCJul 17, 03:10 UTC2h 5m
2026-07-16 ASA712 - Jul 16, 21:19 UTCJul 16, 23:10 UTC1h 50m
2026-07-16 ASA588 - Jul 16, 17:49 UTCJul 16, 20:05 UTC2h 15m
2026-07-16 ASA1629 LAS → PDX Jul 16, 14:10 UTCJul 16, 16:00 UTC1h 50m
2026-07-16 ASA605 - Jul 16, 01:30 UTCJul 16, 03:50 UTC2h 20m
2026-07-15 ASA674 PHX → PAE Jul 15, 22:05 UTCJul 16, 00:30 UTC2h 25m
2026-07-15 ASA674 PHX → PAE Jul 15, 22:04 UTCJul 16, 00:36 UTC2h 32m
2026-07-15 ASA716 PDX → PHX Jul 15, 17:55 UTCJul 15, 20:40 UTC2h 45m
2026-07-15 ASA668 - Jul 15, 14:35 UTCJul 15, 16:20 UTC1h 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 N556AS page for operator, model, and routing details .

Mode-S A715C6 frequently asked

What is Mode-S code A715C6?
A715C6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N556AS.
Where is Mode-S A715C6 registered?
Mode-S code A715C6 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 A715C6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A715C6, octal 51612706, decimal 10,950,086.
What flights does A715C6 operate?
Mode-S A715C6 has broadcast 20 distinct callsigns, including ASA46, ASA760, ASA494, ASA766, ASA45.