Apparatus

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sensors Mode-S transponder

A675A9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N515SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A675A9
Octal
51472651
Decimal
10,909,097
Country
US
Tail
N515SY
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
672
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A675A9.

Country allocation

The ICAO 24-bit address A675A9 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
SKW6353 SkyWest Airlines 17 2026-05-12
SKW4925 - 16 2026-07-16
SKW6336 SkyWest Airlines 15 2026-06-18
SKW4975 SkyWest Airlines 15 2026-07-26
SKW4934 SkyWest Airlines 15 2026-07-22
SKW6188 - 14 2026-06-18
SKW6332 SkyWest Airlines 13 2026-07-26
SKW4995 SkyWest Airlines 13 2026-07-22
SKW6415 - 12 2026-07-16
SKW6409 SkyWest Airlines 12 2026-05-31
SKW6404 SkyWest Airlines 12 2026-07-22
SKW4944 - 12 2026-07-15
SKW6435 - 11 2026-07-14
SKW6253 SkyWest Airlines 11 2026-07-26
SKW4983 SkyWest Airlines 11 2026-07-24
SKW4982 SkyWest Airlines 11 2026-07-24
SKW4915 - 11 2026-07-15
SKW6475 SkyWest Airlines 10 2026-07-26
SKW6307 - 10 2026-07-02
SKW6221 - 10 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6253 ORD → SGF Jul 26, 20:35 UTCJul 26, 22:15 UTC1h 40m
2026-07-26 SKW6253 ORD → SGF Jul 26, 17:30 UTCJul 26, 19:25 UTC1h 55m
2026-07-26 SKW6475 PHX → DRO Jul 26, 14:31 UTCJul 26, 16:27 UTC1h 56m
2026-07-26 SKW6332 LAX → AUS Jul 26, 04:40 UTCJul 26, 06:15 UTC1h 35m
2026-07-26 SKW6332 LAX → AUS Jul 26, 04:40 UTCJul 26, 06:16 UTC1h 36m
2026-07-26 SKW4975 SJT → DFW Jul 26, 02:50 UTCJul 26, 03:50 UTC1h 0m
2026-07-26 SKW4975 SJT → DFW Jul 26, 00:40 UTCJul 26, 01:40 UTC1h 0m
2026-07-25 SKW6416 LAX → SFO Jul 25, 19:38 UTCJul 25, 22:03 UTC2h 25m
2026-07-25 SKW6416 LAX → SFO Jul 25, 16:15 UTCJul 25, 22:15 UTC6h 0m
2026-07-25 SKW4900 LAX → PDX Jul 25, 14:15 UTCJul 25, 14:40 UTC25m
2026-07-25 SKW6370 FAR → ORD Jul 25, 02:35 UTCJul 25, 03:00 UTC25m
2026-07-24 SKW4948 YUM → PHX Jul 24, 21:00 UTCJul 24, 22:50 UTC1h 50m
2026-07-24 SKW4948 YUM → PHX Jul 24, 18:10 UTCJul 24, 19:50 UTC1h 40m
2026-07-24 SKW4983 CID → PHX Jul 24, 14:15 UTCJul 24, 16:55 UTC2h 40m
2026-07-24 SKW4983 CID → PHX Jul 24, 14:03 UTCJul 24, 17:13 UTC3h 10m
2026-07-24 SKW4982 STL → DFW Jul 24, 02:05 UTCJul 24, 04:40 UTC2h 35m
2026-07-23 SKW6220 BFL → PHX Jul 23, 22:40 UTCJul 24, 01:10 UTC2h 30m
2026-07-23 SKW6220 BFL → PHX Jul 23, 18:30 UTCJul 23, 19:35 UTC1h 5m
2026-07-23 SKW6475 PHX → DRO Jul 23, 14:25 UTCJul 23, 16:15 UTC1h 50m
2026-07-23 SKW6475 PHX → DRO Jul 23, 14:24 UTCJul 23, 16:19 UTC1h 55m
2026-07-23 SKW6332 LAX → AUS Jul 23, 02:50 UTCJul 23, 04:30 UTC1h 40m
2026-07-22 SKW4934 PHX → MFR Jul 22, 23:30 UTCJul 23, 01:15 UTC1h 45m
2026-07-22 SKW4934 PHX → MFR Jul 22, 20:50 UTCJul 22, 22:30 UTC1h 40m
2026-07-22 SKW4995 DFW → LAW Jul 22, 18:15 UTCJul 22, 19:15 UTC1h 0m
2026-07-22 SKW4995 DFW → LAW Jul 22, 16:20 UTCJul 22, 17:15 UTC55m
2026-07-22 SKW6404 SFO → PHX Jul 22, 13:05 UTCJul 22, 14:45 UTC1h 40m
2026-07-22 SKW6404 SFO → PHX Jul 22, 13:01 UTCJul 22, 14:44 UTC1h 43m
2026-07-22 SKW6260 LAX → SFO Jul 22, 01:30 UTCJul 22, 02:20 UTC50m
2026-07-21 SKW6366 - Jul 21, 20:40 UTCJul 21, 23:35 UTC2h 55m
2026-07-21 SKW6366 - Jul 21, 16:45 UTCJul 21, 19:35 UTC2h 50m
2026-07-21 SKW6293 - Jul 21, 11:45 UTCJul 21, 15:05 UTC3h 20m
2026-07-21 SKW5000 ORD → FSD Jul 21, 01:45 UTCJul 21, 05:10 UTC3h 25m
2026-07-20 SKW6221 - Jul 20, 23:45 UTCJul 21, 00:45 UTC1h 0m
2026-07-20 SKW6221 - Jul 20, 21:25 UTCJul 20, 22:15 UTC50m
2026-07-20 SKW4977 - Jul 20, 15:35 UTCJul 20, 20:00 UTC4h 25m
2026-07-20 SKW6393 TUS → LAX Jul 20, 13:10 UTCJul 20, 14:20 UTC1h 10m
2026-07-20 SKW6370 PHX → TUS Jul 20, 02:30 UTCJul 20, 03:00 UTC30m
2026-07-19 SKW6253 MFR → PHX Jul 19, 21:25 UTCJul 19, 23:25 UTC2h 0m
2026-07-19 SKW6253 PHX → MFR Jul 19, 17:25 UTCJul 19, 19:15 UTC1h 50m
2026-07-19 SKW6253 PHX → MFR Jul 19, 17:22 UTCJul 19, 19:14 UTC1h 52m
2026-07-19 SKW6475 PHX → DRO Jul 19, 14:25 UTCJul 19, 16:10 UTC1h 45m
2026-07-19 SKW6332 - Jul 19, 05:25 UTCJul 19, 07:25 UTC2h 0m
2026-07-19 SKW6332 PHX → BOI Jul 19, 05:24 UTCJul 19, 07:06 UTC1h 42m
2026-07-19 SKW4975 - Jul 19, 03:30 UTCJul 19, 04:30 UTC1h 0m
2026-07-19 SKW4975 - Jul 19, 01:35 UTCJul 19, 02:20 UTC45m
2026-07-18 SKW4948 - Jul 18, 22:35 UTCJul 19, 00:25 UTC1h 50m
2026-07-18 SKW4948 - Jul 18, 19:20 UTCJul 18, 20:55 UTC1h 35m
2026-07-18 SKW6360 - Jul 18, 12:25 UTCJul 18, 14:40 UTC2h 15m
2026-07-18 SKW6292 - Jul 18, 04:00 UTCJul 18, 06:10 UTC2h 10m
2026-07-18 SKW4975 - Jul 18, 01:15 UTCJul 18, 02:00 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 N515SY page for operator, model, and routing details .

Mode-S A675A9 frequently asked

What is Mode-S code A675A9?
A675A9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N515SY.
Where is Mode-S A675A9 registered?
Mode-S code A675A9 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 A675A9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A675A9, octal 51472651, decimal 10,909,097.
What flights does A675A9 operate?
Mode-S A675A9 has broadcast 20 distinct callsigns, including SKW6353, SKW4925, SKW6336, SKW4975, SKW4934.