Apparatus

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sensors Mode-S transponder

A63F4E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N501SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A63F4E
Octal
51437516
Decimal
10,895,182
Country
US
Tail
N501SY
Type
E75L
Broadcasting now · callsign SKW6286 · 27,600 ft
Flights observed
573
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Current position

A63F4E is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A63F4E 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
SKW6272 SkyWest Airlines 23 2026-07-24
SKW6330 SkyWest Airlines 15 2026-07-25
SKW6415 - 13 2026-07-07
SKW6220 - 13 2026-07-06
SKW4925 - 12 2026-07-07
SKW6381 SkyWest Airlines 11 2026-07-20
SKW6224 - 11 2026-07-14
SKW6422 SkyWest Airlines 10 2026-05-15
SKW6190 SkyWest Airlines 10 2026-07-23
SKW5005 SkyWest Airlines 10 2026-07-22
SKW4977 - 10 2026-07-14
SKW6307 SkyWest Airlines 9 2026-07-23
SKW6227 - 9 2026-07-14
SKW4991 SkyWest Airlines 9 2026-05-05
SKW4985 SkyWest Airlines 9 2026-05-05
SKW6367 - 8 2026-07-05
SKW6361 - 8 2026-07-01
SKW6308 SkyWest Airlines 8 2026-04-16
SKW4982 - 8 2026-07-07
SKW4971 SkyWest Airlines 8 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6270 LAX → SFO Jul 26, 19:45 UTCJul 26, 21:30 UTC1h 45m
2026-07-26 SKW6425 MAF → DFW Jul 26, 17:35 UTCJul 26, 18:15 UTC40m
2026-07-26 SKW6425 MAF → DFW Jul 26, 15:20 UTCJul 26, 16:05 UTC45m
2026-07-26 SKW4971 DFW → LRD Jul 26, 00:55 UTCJul 26, 04:10 UTC3h 15m
2026-07-25 SKW4971 DFW → LRD Jul 25, 21:10 UTCJul 26, 00:05 UTC2h 55m
2026-07-25 SKW6330 BTV → ORD Jul 25, 19:15 UTCJul 25, 20:15 UTC1h 0m
2026-07-25 SKW6330 BTV → ORD Jul 25, 17:25 UTCJul 25, 18:20 UTC55m
2026-07-25 SKW6185 SFO → LAX Jul 25, 12:25 UTCJul 25, 15:00 UTC2h 35m
2026-07-24 SKW4979 DFW → MLU Jul 24, 23:45 UTCJul 25, 02:30 UTC2h 45m
2026-07-24 SKW6272 MRY → PHX Jul 24, 21:25 UTCJul 24, 22:40 UTC1h 15m
2026-07-24 SKW6272 MRY → PHX Jul 24, 19:40 UTCJul 24, 20:55 UTC1h 15m
2026-07-24 SKW6272 MRY → PHX Jul 24, 19:38 UTCJul 24, 22:39 UTC3h 1m
2026-07-24 SKW6272 MRY → PHX Jul 24, 15:55 UTCJul 24, 18:35 UTC2h 40m
2026-07-24 SKW6294 SFO → LAX Jul 24, 13:30 UTCJul 24, 14:30 UTC1h 0m
2026-07-24 SKW6510 LAX → SFO Jul 24, 06:10 UTCJul 24, 07:15 UTC1h 5m
2026-07-24 SKW6510 LAX → SFO Jul 24, 06:09 UTCJul 24, 07:14 UTC1h 5m
2026-07-24 SKW6346 ORD → BNA Jul 24, 02:30 UTCJul 24, 03:35 UTC1h 5m
2026-07-24 SKW6346 ORD → BNA Jul 24, 00:25 UTCJul 24, 01:25 UTC1h 0m
2026-07-23 SKW6307 DFW → SHV Jul 23, 20:25 UTCJul 23, 23:00 UTC2h 35m
2026-07-23 SKW6307 DFW → SHV Jul 23, 20:24 UTCJul 23, 22:51 UTC2h 27m
2026-07-23 SKW6307 DFW → SHV Jul 23, 16:45 UTCJul 23, 19:30 UTC2h 45m
2026-07-23 SKW4919 SBA → PHX Jul 23, 13:15 UTCJul 23, 14:50 UTC1h 35m
2026-07-23 SKW296Y LAX → ABQ Jul 23, 03:50 UTCJul 23, 05:25 UTC1h 35m
2026-07-23 SKW4946 ORD → BUF Jul 23, 02:10 UTCJul 23, 02:50 UTC40m
2026-07-23 SKW6190 ORD → DTW Jul 23, 00:05 UTCJul 23, 01:05 UTC1h 0m
2026-07-22 SKW6188 ORD → DTW Jul 22, 22:00 UTCJul 22, 22:55 UTC55m
2026-07-22 SKW6188 ORD → DTW Jul 22, 19:55 UTCJul 22, 20:50 UTC55m
2026-07-22 SKW6336 PHX → ICT Jul 22, 16:25 UTCJul 22, 17:25 UTC1h 0m
2026-07-22 SKW6336 PHX → ICT Jul 22, 14:20 UTCJul 22, 15:10 UTC50m
2026-07-22 SKW5005 PHX → STS Jul 22, 01:45 UTCJul 22, 04:40 UTC2h 55m
2026-07-22 SKW5005 PHX → STS Jul 22, 01:42 UTCJul 22, 04:35 UTC2h 53m
2026-07-21 SKW5005 PHX → STS Jul 21, 21:35 UTCJul 22, 00:30 UTC2h 55m
2026-07-21 SKW6330 BTV → ORD Jul 21, 19:04 UTCJul 21, 20:04 UTC1h 0m
2026-07-21 SKW6330 BTV → ORD Jul 21, 19:05 UTCJul 21, 20:05 UTC1h 0m
2026-07-21 SKW6330 BTV → ORD Jul 21, 16:55 UTCJul 21, 17:45 UTC50m
2026-07-21 SKW4951 BNA → ORD Jul 21, 12:20 UTCJul 21, 15:00 UTC2h 40m
2026-07-21 SKW4951 BNA → ORD Jul 21, 12:19 UTCJul 21, 14:59 UTC2h 40m
2026-07-21 SKW4962 LAX → SAT Jul 21, 04:20 UTCJul 21, 04:40 UTC20m
2026-07-21 SKW4962 LAX → SAT Jul 21, 01:30 UTCJul 21, 04:40 UTC3h 10m
2026-07-21 SKW4962 LAX → SAT Jul 21, 01:28 UTCJul 21, 04:05 UTC2h 37m
2026-07-20 SKW6381 PHX → SEA Jul 20, 20:55 UTCJul 20, 23:55 UTC3h 0m
2026-07-20 SKW6381 PHX → SEA Jul 20, 16:55 UTCJul 20, 19:55 UTC3h 0m
2026-07-20 SKW4895 - Jul 20, 12:55 UTCJul 20, 15:30 UTC2h 35m
2026-07-20 SKW4898 TUL → ORD Jul 20, 03:35 UTCJul 20, 06:15 UTC2h 40m
2026-07-20 SKW6272 - Jul 20, 00:05 UTCJul 20, 02:40 UTC2h 35m
2026-07-19 SKW6272 - Jul 19, 20:35 UTCJul 19, 23:15 UTC2h 40m
2026-07-19 SKW6294 SFO → LAX Jul 19, 18:30 UTCJul 19, 19:30 UTC1h 0m
2026-07-19 SKW255W FAT → PHX Jul 19, 16:25 UTCJul 19, 17:20 UTC55m
2026-07-19 SKW4971 DFW → LRD Jul 19, 00:10 UTCJul 19, 03:10 UTC3h 0m
2026-07-19 SKW4971 DFW → LRD Jul 19, 00:08 UTCJul 19, 03:10 UTC3h 2m

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 N501SY page for operator, model, and routing details .

Mode-S A63F4E frequently asked

What is Mode-S code A63F4E?
A63F4E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N501SY.
Where is Mode-S A63F4E registered?
Mode-S code A63F4E 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 A63F4E broadcasting right now?
Yes. Mode-S A63F4E is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A63F4E, octal 51437516, decimal 10,895,182.
What flights does A63F4E operate?
Mode-S A63F4E has broadcast 20 distinct callsigns, including SKW6272, SKW6330, SKW6415, SKW6220, SKW4925.