Apparatus

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sensors Mode-S transponder

A64A73

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N504SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A64A73
Octal
51445163
Decimal
10,898,035
Country
US
Tail
N504SY
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
582
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A64A73.

Country allocation

The ICAO 24-bit address A64A73 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
SKW6409 - 20 2026-07-18
SKW6240 SkyWest Airlines 14 2026-05-15
SKW4982 - 12 2026-07-10
SKW4944 SkyWest Airlines 12 2026-07-26
SKW6415 SkyWest Airlines 11 2026-07-23
SKW5011 SkyWest Airlines 11 2026-05-14
SKW4983 - 11 2026-07-10
SKW4995 - 10 2026-06-28
SKW4977 SkyWest Airlines 10 2026-07-24
SKW4971 - 10 2026-07-14
SKW4915 SkyWest Airlines 10 2026-07-26
SKW4906 SkyWest Airlines 10 2026-07-26
SKW6404 SkyWest Airlines 9 2026-07-25
SKW6361 SkyWest Airlines 9 2026-06-01
SKW6360 SkyWest Airlines 9 2026-07-23
SKW6293 - 9 2026-07-06
SKW6221 - 9 2026-07-15
SKW4975 SkyWest Airlines 9 2026-07-23
SKW4925 SkyWest Airlines 9 2026-07-23
SKW6336 SkyWest Airlines 8 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4906 PHX → TUS Jul 26, 16:30 UTCJul 26, 22:05 UTC5h 35m
2026-07-26 SKW6401 MFR → PHX Jul 26, 12:35 UTCJul 26, 14:40 UTC2h 5m
2026-07-26 SKW4915 ORD → MLI Jul 26, 04:30 UTCJul 26, 06:30 UTC2h 0m
2026-07-26 SKW4944 PHX → PSC Jul 26, 02:25 UTCJul 26, 03:35 UTC1h 10m
2026-07-26 SKW4944 PHX → PSC Jul 26, 00:30 UTCJul 26, 01:30 UTC1h 0m
2026-07-25 SKW6253 ORD → SGF Jul 25, 20:50 UTCJul 25, 23:10 UTC2h 20m
2026-07-25 SKW6253 ORD → SGF Jul 25, 18:00 UTCJul 25, 20:00 UTC2h 0m
2026-07-25 SKW6404 SFO → PHX Jul 25, 13:05 UTCJul 25, 14:40 UTC1h 35m
2026-07-25 SKW6404 SFO → PHX Jul 25, 13:03 UTCJul 25, 14:40 UTC1h 37m
2026-07-25 SKW6260 LAX → SFO Jul 25, 05:45 UTCJul 25, 06:45 UTC1h 0m
2026-07-25 SKW6260 LAX → SFO Jul 25, 05:44 UTCJul 25, 06:52 UTC1h 8m
2026-07-25 SKW4958 ORD → MKE Jul 25, 01:05 UTCJul 25, 03:10 UTC2h 5m
2026-07-24 SKW4958 ORD → MKE Jul 24, 21:20 UTCJul 24, 23:45 UTC2h 25m
2026-07-24 SKW4977 HRL → ORD Jul 24, 15:45 UTCJul 24, 20:05 UTC4h 20m
2026-07-24 SKW6227 MCI → ORD Jul 24, 11:15 UTCJul 24, 14:25 UTC3h 10m
2026-07-24 SKW6420 SEA → LAX Jul 24, 02:30 UTCJul 24, 04:45 UTC2h 15m
2026-07-23 SKW6415 LCH → DFW Jul 23, 23:50 UTCJul 24, 01:00 UTC1h 10m
2026-07-23 SKW6415 LCH → DFW Jul 23, 21:55 UTCJul 23, 23:05 UTC1h 10m
2026-07-23 SKW4925 PHX → HMO Jul 23, 19:25 UTCJul 23, 20:20 UTC55m
2026-07-23 SKW4925 PHX → HMO Jul 23, 17:30 UTCJul 23, 18:25 UTC55m
2026-07-23 SKW6360 ORD → LEX Jul 23, 12:30 UTCJul 23, 14:45 UTC2h 15m
2026-07-23 SKW6360 ORD → LEX Jul 23, 12:24 UTCJul 23, 14:42 UTC2h 18m
2026-07-23 SKW6292 ORD → ICT Jul 23, 03:55 UTCJul 23, 06:00 UTC2h 5m
2026-07-23 SKW4975 SJT → DFW Jul 23, 01:25 UTCJul 23, 02:25 UTC1h 0m
2026-07-22 SKW4975 SJT → DFW Jul 22, 22:45 UTCJul 22, 23:35 UTC50m
2026-07-22 SKW6416 LAX → SFO Jul 22, 16:30 UTCJul 22, 21:30 UTC5h 0m
2026-07-22 SKW4900 - Jul 22, 14:15 UTCJul 22, 14:40 UTC25m
2026-07-22 SKW6370 FAR → ORD Jul 22, 02:40 UTCJul 22, 03:10 UTC30m
2026-07-22 SKW6370 FAR → ORD Jul 22, 02:31 UTCJul 22, 03:01 UTC30m
2026-07-21 SKW4893 YUM → PHX Jul 21, 13:40 UTCJul 21, 15:55 UTC2h 15m
2026-07-21 SKW6224 ABQ → LAX Jul 21, 01:45 UTCJul 21, 04:35 UTC2h 50m
2026-07-20 SKW6278 PHX → BFL Jul 20, 21:00 UTCJul 20, 23:45 UTC2h 45m
2026-07-20 SKW6278 PHX → BFL Jul 20, 17:05 UTCJul 20, 20:00 UTC2h 55m
2026-07-20 SKW6482 - Jul 20, 12:30 UTCJul 20, 15:20 UTC2h 50m
2026-07-20 SKW6187 - Jul 20, 01:30 UTCJul 20, 04:35 UTC3h 5m
2026-07-19 SKW6366 - Jul 19, 20:40 UTCJul 19, 23:15 UTC2h 35m
2026-07-19 SKW6366 - Jul 19, 17:05 UTCJul 19, 19:55 UTC2h 50m
2026-07-19 SKW4895 - Jul 19, 12:40 UTCJul 19, 15:35 UTC2h 55m
2026-07-19 SKW4898 LAX → OKC Jul 19, 01:25 UTCJul 19, 04:10 UTC2h 45m
2026-07-18 SKW6409 - Jul 18, 21:05 UTCJul 19, 00:00 UTC2h 55m
2026-07-18 SKW6409 - Jul 18, 16:50 UTCJul 18, 19:30 UTC2h 40m
2026-07-18 SKW6185 AUS → LAX Jul 18, 12:24 UTCJul 18, 15:11 UTC2h 47m
2026-07-18 SKW6185 - Jul 18, 12:25 UTCJul 18, 12:45 UTC20m
2026-07-18 SKW4979 - Jul 18, 00:35 UTCJul 18, 03:15 UTC2h 41m
2026-07-18 SKW4979 LAX → AUS Jul 18, 00:33 UTCJul 18, 03:14 UTC2h 41m
2026-07-17 SKW6188 - Jul 17, 22:35 UTCJul 17, 23:30 UTC55m
2026-07-17 SKW6188 SFO → LAX Jul 17, 22:19 UTCJul 17, 23:29 UTC1h 10m
2026-07-17 SKW6188 - Jul 17, 20:15 UTCJul 17, 21:10 UTC55m
2026-07-17 SKW6336 PHX → ICT Jul 17, 18:00 UTCJul 17, 19:00 UTC1h 0m
2026-07-17 SKW6336 PHX → ICT Jul 17, 17:56 UTCJul 17, 18:59 UTC1h 3m

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 N504SY page for operator, model, and routing details .

Mode-S A64A73 frequently asked

What is Mode-S code A64A73?
A64A73 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N504SY.
Where is Mode-S A64A73 registered?
Mode-S code A64A73 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 A64A73 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 A64A73, octal 51445163, decimal 10,898,035.
What flights does A64A73 operate?
Mode-S A64A73 has broadcast 20 distinct callsigns, including SKW6409, SKW6240, SKW4982, SKW4944, SKW6415.