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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
Broadcasting now · callsign ASA624 · 35,000 ft
Flights observed
446
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A715C6 is currently broadcasting. Map zoomed to live position.

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
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
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
ASA230 - 4 2026-07-07
ASA224 - 4 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ASA481 SJC → SEA Jul 14, 02:25 UTCJul 14, 03:55 UTC1h 30m
2026-07-13 ASA319 SEA → SJC Jul 13, 23:00 UTCJul 14, 01:00 UTC2h 0m
2026-07-13 ASA293 GEG → SEA Jul 13, 20:50 UTCJul 13, 21:45 UTC55m
2026-07-13 ASA449 SEA → GEG Jul 13, 18:55 UTCJul 13, 19:35 UTC40m
2026-07-13 ASA427 - Jul 13, 17:00 UTCJul 13, 17:25 UTC25m
2026-07-12 ASA1519 - Jul 12, 23:05 UTCJul 13, 02:20 UTC3h 15m
2026-07-12 ASA1525 - Jul 12, 18:35 UTCJul 12, 21:35 UTC3h 0m
2026-07-12 ASA750 - Jul 12, 15:05 UTCJul 12, 16:55 UTC1h 50m
2026-07-12 ASA518 PDX → SNA Jul 12, 03:05 UTCJul 12, 05:20 UTC2h 15m
2026-07-11 ASA1369 - Jul 11, 20:50 UTCJul 12, 01:55 UTC5h 5m
2026-07-11 ASA374 - Jul 11, 14:55 UTCJul 11, 19:35 UTC4h 40m
2026-07-11 ASA1520 FAI → PDX Jul 11, 08:40 UTCJul 11, 12:15 UTC3h 35m
2026-07-11 ASA1880 SEA → FAI Jul 11, 03:40 UTCJul 11, 06:55 UTC3h 15m
2026-07-10 ASA508 - Jul 10, 21:20 UTCJul 11, 01:45 UTC4h 25m
2026-07-10 ASA508 SEA → CVG Jul 10, 16:10 UTCJul 10, 20:05 UTC3h 55m
2026-07-10 ASA279 GEG → SEA Jul 10, 13:25 UTCJul 10, 14:05 UTC40m
2026-07-10 ASA566 - Jul 10, 04:00 UTCJul 10, 06:10 UTC2h 10m
2026-07-10 ASA566 SAN → GEG Jul 10, 03:58 UTCJul 10, 06:11 UTC2h 13m
2026-07-09 ASA1638 TPA → SAN Jul 9, 21:55 UTCJul 10, 02:25 UTC4h 30m
2026-07-09 ASA1639 SAN → TPA Jul 9, 15:45 UTCJul 9, 20:05 UTC4h 20m
2026-07-09 ASA1617 DEN → SAN Jul 9, 12:15 UTCJul 9, 14:10 UTC1h 55m
2026-07-09 ASA310 SEA → DEN Jul 9, 02:10 UTCJul 9, 04:15 UTC2h 5m
2026-07-08 ASA537 BUR → SEA Jul 8, 22:10 UTCJul 9, 00:20 UTC2h 10m
2026-07-08 ASA537 BUR → SEA Jul 8, 22:07 UTCJul 9, 00:06 UTC1h 59m
2026-07-08 ASA529 SEA → BUR Jul 8, 18:40 UTCJul 8, 20:40 UTC2h 0m
2026-07-08 ASA529 SEA → BUR Jul 8, 18:36 UTCJul 8, 20:37 UTC2h 1m
2026-07-08 ASA444 BUR → SEA Jul 8, 14:20 UTCJul 8, 16:25 UTC2h 5m
2026-07-08 ASA1408 SJC → GDL Jul 8, 02:35 UTCJul 8, 04:45 UTC2h 10m
2026-07-07 ASA697 - Jul 7, 23:40 UTCJul 8, 00:40 UTC1h 0m
2026-07-07 ASA697 - Jul 7, 21:20 UTCJul 7, 22:10 UTC50m
2026-07-07 ASA230 EWR → SEA Jul 7, 14:00 UTCJul 7, 19:10 UTC5h 10m
2026-07-07 ASA314 SEA → EWR Jul 7, 06:05 UTCJul 7, 10:50 UTC4h 45m
2026-07-07 ASA9822 ANC → SEA Jul 7, 00:35 UTCJul 7, 03:50 UTC3h 15m
2026-07-04 ASA1637 LAS → ANC Jul 4, 23:45 UTCJul 5, 04:45 UTC5h 0m
2026-07-04 ASA658 SEA → LAS Jul 4, 20:15 UTCJul 4, 22:15 UTC2h 0m
2026-07-04 ASA1468 SMF → SEA Jul 4, 17:35 UTCJul 4, 19:00 UTC1h 25m
2026-07-04 ASA682 SEA → SMF Jul 4, 14:35 UTCJul 4, 15:55 UTC1h 20m
2026-07-03 ASA356 EWR → SEA Jul 3, 23:15 UTCJul 4, 04:50 UTC5h 35m
2026-07-03 ASA239 SEA → EWR Jul 3, 15:05 UTCJul 3, 19:55 UTC4h 50m
2026-07-03 ASA1498 ANC → SEA Jul 3, 09:00 UTCJul 3, 11:50 UTC2h 50m
2026-07-02 ASA51 ANC → ANC Jul 2, 22:35 UTCJul 3, 02:50 UTC4h 15m
2026-07-02 ASA1528 SEA → BUR Jul 2, 19:30 UTCJul 2, 20:50 UTC1h 20m
2026-07-02 ASA1527 ANC → OTZ Jul 2, 17:10 UTCJul 2, 18:25 UTC1h 15m
2026-07-02 ASA1527 ANC → OTZ Jul 2, 17:06 UTCJul 2, 18:23 UTC1h 17m
2026-07-02 ASA9341 ANC → ANC Jul 2, 00:45 UTCJul 2, 04:40 UTC3h 55m
2026-07-01 ASA43 - Jul 1, 22:05 UTCJul 1, 22:50 UTC45m
2026-07-01 ASA43 - Jul 1, 19:55 UTCJul 1, 20:40 UTC45m
2026-07-01 ASA79 SEA → ANC Jul 1, 15:15 UTCJul 1, 18:30 UTC3h 15m
2026-07-01 ASA1508 FAI → SEA Jul 1, 00:05 UTCJul 1, 03:15 UTC3h 10m
2026-06-30 ASA1507 SEA → FAI Jun 30, 19:30 UTCJun 30, 22:55 UTC3h 25m

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?
Yes. Mode-S A715C6 is currently airborne.
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.