Apparatus

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sensors Mode-S transponder

A6594F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N508SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A6594F
Octal
51454517
Decimal
10,901,839
Country
US
Tail
N508SY
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
651
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A6594F.

Country allocation

The ICAO 24-bit address A6594F 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
SKW4985 SkyWest Airlines 18 2026-05-20
SKW4975 SkyWest Airlines 18 2026-07-20
SKW6415 - 14 2026-07-14
SKW6409 - 14 2026-07-01
SKW6330 - 14 2026-07-04
SKW4958 SkyWest Airlines 14 2026-07-26
SKW6381 - 13 2026-06-28
SKW6366 - 11 2026-06-30
SKW4913 SkyWest Airlines 11 2026-05-03
SKW4908 - 11 2026-06-26
SKW6278 - 10 2026-06-26
SKW5005 - 10 2026-06-23
SKW4915 - 10 2026-07-09
SKW6371 SkyWest Airlines 9 2026-05-05
SKW6293 - 9 2026-06-29
SKW6265 - 9 2026-06-26
SKW4982 SkyWest Airlines 9 2026-05-28
SKW6482 - 8 2026-07-01
SKW6368 - 8 2026-07-21
SKW6241 SkyWest Airlines 8 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4934 PHX → MFR Jul 26, 20:40 UTCJul 26, 21:45 UTC1h 5m
2026-07-26 SKW4995 DFW → LAW Jul 26, 18:15 UTCJul 26, 19:25 UTC1h 10m
2026-07-26 SKW4995 DFW → LAW Jul 26, 16:15 UTCJul 26, 17:10 UTC55m
2026-07-26 SKW6404 SFO → PHX Jul 26, 13:00 UTCJul 26, 14:40 UTC1h 40m
2026-07-26 SKW6260 LAX → SFO Jul 26, 05:20 UTCJul 26, 06:15 UTC55m
2026-07-26 SKW4958 ORD → MKE Jul 26, 01:05 UTCJul 26, 03:00 UTC1h 55m
2026-07-25 SKW4958 ORD → MKE Jul 25, 21:20 UTCJul 25, 23:25 UTC2h 5m
2026-07-25 SKW4977 HRL → ORD Jul 25, 15:40 UTCJul 25, 20:00 UTC4h 20m
2026-07-25 SKW6227 MCI → ORD Jul 25, 11:15 UTCJul 25, 14:15 UTC3h 0m
2026-07-25 SKW6224 ABQ → LAX Jul 25, 01:45 UTCJul 25, 04:35 UTC2h 50m
2026-07-24 SKW6221 FAT → PHX Jul 24, 23:25 UTCJul 25, 00:25 UTC1h 0m
2026-07-24 SKW6221 FAT → PHX Jul 24, 23:22 UTCJul 25, 00:24 UTC1h 2m
2026-07-24 SKW6221 FAT → PHX Jul 24, 21:20 UTCJul 24, 22:20 UTC1h 0m
2026-07-24 SKW4887 RNO → LAX Jul 24, 18:20 UTCJul 24, 19:45 UTC1h 25m
2026-07-24 SKW4887 RNO → LAX Jul 24, 18:19 UTCJul 24, 19:53 UTC1h 34m
2026-07-24 SKW4887 RNO → LAX Jul 24, 15:40 UTCJul 24, 17:20 UTC1h 40m
2026-07-24 SKW4919 SBA → PHX Jul 24, 13:10 UTCJul 24, 14:40 UTC1h 30m
2026-07-24 SKW4919 SBA → PHX Jul 24, 13:08 UTCJul 24, 14:38 UTC1h 30m
2026-07-24 SKW296Y LAX → ABQ Jul 24, 03:15 UTCJul 24, 04:45 UTC1h 30m
2026-07-24 SKW4946 ORD → BUF Jul 24, 01:20 UTCJul 24, 02:05 UTC45m
2026-07-23 SKW6190 ORD → DTW Jul 23, 23:30 UTCJul 23, 23:45 UTC15m
2026-07-23 SKW6190 ORD → DTW Jul 23, 23:29 UTCJul 24, 00:13 UTC44m
2026-07-23 SKW6188 ORD → DTW Jul 23, 21:10 UTCJul 23, 22:10 UTC1h 0m
2026-07-23 SKW6188 ORD → DTW Jul 23, 21:16 UTCJul 23, 22:05 UTC49m
2026-07-23 SKW6188 ORD → DTW Jul 23, 19:20 UTCJul 23, 20:15 UTC55m
2026-07-23 SKW6336 PHX → ICT Jul 23, 16:40 UTCJul 23, 17:35 UTC55m
2026-07-23 SKW6336 PHX → ICT Jul 23, 14:20 UTCJul 23, 15:15 UTC55m
2026-07-23 SKW4958 ORD → MKE Jul 23, 03:30 UTCJul 23, 05:30 UTC2h 0m
2026-07-23 SKW4958 ORD → MKE Jul 23, 00:20 UTCJul 23, 02:30 UTC2h 10m
2026-07-22 SKW4887 - Jul 22, 18:25 UTCJul 22, 20:00 UTC1h 35m
2026-07-22 SKW4887 - Jul 22, 15:45 UTCJul 22, 17:25 UTC1h 40m
2026-07-22 SKW6294 SFO → LAX Jul 22, 13:40 UTCJul 22, 14:35 UTC55m
2026-07-22 SKW6294 SFO → LAX Jul 22, 13:35 UTCJul 22, 14:33 UTC58m
2026-07-22 SKW4958 ORD → MKE Jul 22, 00:55 UTCJul 22, 02:50 UTC1h 55m
2026-07-21 SKW4958 ORD → MKE Jul 21, 21:10 UTCJul 21, 23:20 UTC2h 10m
2026-07-21 SKW4977 - Jul 21, 15:35 UTCJul 21, 20:05 UTC4h 30m
2026-07-21 SKW6227 MCI → ORD Jul 21, 11:05 UTCJul 21, 14:30 UTC3h 25m
2026-07-21 SKW6420 SEA → LAX Jul 21, 02:45 UTCJul 21, 05:15 UTC2h 30m
2026-07-21 SKW6368 - Jul 21, 01:15 UTCJul 21, 01:40 UTC25m
2026-07-21 SKW6368 TUS → PHX Jul 21, 01:13 UTCJul 21, 01:39 UTC26m
2026-07-20 SKW6368 PHX → TUS Jul 20, 23:45 UTCJul 21, 00:25 UTC40m
2026-07-20 SKW4906 PHX → TUS Jul 20, 19:36 UTCJul 20, 22:04 UTC2h 28m
2026-07-20 SKW4906 PHX → TUS Jul 20, 16:05 UTCJul 20, 22:05 UTC6h 0m
2026-07-20 SKW6360 - Jul 20, 12:30 UTCJul 20, 14:40 UTC2h 10m
2026-07-20 SKW6292 ORD → ICT Jul 20, 03:50 UTCJul 20, 05:50 UTC2h 0m
2026-07-20 SKW4975 SJT → DFW Jul 20, 01:15 UTCJul 20, 02:10 UTC55m
2026-07-19 SKW4975 SJT → DFW Jul 19, 22:50 UTCJul 19, 23:35 UTC45m
2026-07-19 SKW6416 LAX → SFO Jul 19, 19:43 UTCJul 19, 21:44 UTC2h 1m
2026-07-19 SKW6416 LAX → SFO Jul 19, 16:25 UTCJul 19, 21:45 UTC5h 20m
2026-07-19 SKW4900 - Jul 19, 14:15 UTCJul 19, 14:45 UTC30m

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 N508SY page for operator, model, and routing details .

Mode-S A6594F frequently asked

What is Mode-S code A6594F?
A6594F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N508SY.
Where is Mode-S A6594F registered?
Mode-S code A6594F 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 A6594F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6594F, octal 51454517, decimal 10,901,839.
What flights does A6594F operate?
Mode-S A6594F has broadcast 20 distinct callsigns, including SKW4985, SKW4975, SKW6415, SKW6409, SKW6330.