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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 SKW6227 · 150 ft
Flights observed
489
Distinct callsigns
20
Country
US
Last broadcast
43m ago

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 - 14 2026-07-09
SKW6415 - 13 2026-07-07
SKW6220 - 13 2026-07-06
SKW4925 - 12 2026-07-07
SKW6224 - 11 2026-07-14
SKW6422 SkyWest Airlines 10 2026-05-15
SKW6330 - 10 2026-07-11
SKW6381 SkyWest Airlines 9 2026-06-08
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
SKW6227 - 8 2026-07-14
SKW4982 - 8 2026-07-07
SKW4977 - 8 2026-07-13
SKW4920 SkyWest Airlines 8 2026-05-07
SKW4913 SkyWest Airlines 8 2026-05-07
SKW4912 SkyWest Airlines 8 2026-05-07
SKW6221 - 7 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW6227 - Jul 14, 11:15 UTCJul 14, 13:30 UTC2h 15m
2026-07-14 SKW6224 - Jul 14, 02:00 UTCJul 14, 04:50 UTC2h 50m
2026-07-14 SKW6224 LAX → OMA Jul 14, 01:59 UTCJul 14, 04:48 UTC2h 49m
2026-07-14 SKW6221 SFO → LAX Jul 14, 00:00 UTCJul 14, 01:00 UTC1h 0m
2026-07-13 SKW6221 - Jul 13, 22:05 UTCJul 13, 22:55 UTC50m
2026-07-13 SKW4977 - Jul 13, 15:55 UTCJul 13, 20:25 UTC4h 30m
2026-07-13 SKW6227 - Jul 13, 11:15 UTCJul 13, 14:20 UTC3h 5m
2026-07-13 SKW6227 OMA → LAX Jul 13, 11:11 UTCJul 13, 14:07 UTC2h 56m
2026-07-13 SKW6224 - Jul 13, 03:20 UTCJul 13, 06:15 UTC2h 55m
2026-07-13 SKW6224 LAX → OMA Jul 13, 03:16 UTCJul 13, 06:12 UTC2h 56m
2026-07-13 SKW6221 SFO → LAX Jul 13, 00:46 UTCJul 13, 01:59 UTC1h 13m
2026-07-13 SKW6221 SFO → LAX Jul 13, 01:01 UTCJul 13, 02:05 UTC1h 5m
2026-07-12 SKW6221 - Jul 12, 22:50 UTCJul 12, 23:45 UTC55m
2026-07-12 SKW4887 - Jul 12, 18:20 UTCJul 12, 19:50 UTC1h 30m
2026-07-12 SKW4887 - Jul 12, 15:40 UTCJul 12, 17:20 UTC1h 40m
2026-07-12 SKW6294 - Jul 12, 13:15 UTCJul 12, 14:15 UTC1h 0m
2026-07-12 SKW6294 SFO → LAX Jul 12, 13:14 UTCJul 12, 14:18 UTC1h 4m
2026-07-12 SKW6260 - Jul 12, 04:20 UTCJul 12, 05:15 UTC55m
2026-07-12 SKW4958 - Jul 12, 00:25 UTCJul 12, 02:20 UTC1h 55m
2026-07-11 SKW4958 - Jul 11, 21:25 UTCJul 11, 23:20 UTC1h 55m
2026-07-11 SKW6330 - Jul 11, 19:20 UTCJul 11, 20:20 UTC1h 0m
2026-07-11 SKW6330 - Jul 11, 17:30 UTCJul 11, 18:25 UTC55m
2026-07-11 SKW4951 - Jul 11, 12:15 UTCJul 11, 15:00 UTC2h 45m
2026-07-11 SKW4951 SAT → LAX Jul 11, 12:10 UTCJul 11, 14:47 UTC2h 37m
2026-07-11 SKW4962 - Jul 11, 01:40 UTCJul 11, 04:25 UTC2h 45m
2026-07-10 SKW6221 - Jul 10, 23:40 UTCJul 11, 00:40 UTC1h 0m
2026-07-10 SKW6221 - Jul 10, 21:50 UTCJul 10, 22:45 UTC55m
2026-07-10 SKW6330 - Jul 10, 19:40 UTCJul 10, 20:35 UTC55m
2026-07-10 SKW6330 - Jul 10, 17:40 UTCJul 10, 18:45 UTC1h 5m
2026-07-10 SKW4919 - Jul 10, 13:10 UTCJul 10, 14:55 UTC1h 45m
2026-07-10 SKW4919 ABQ → LAX Jul 10, 13:09 UTCJul 10, 14:45 UTC1h 36m
2026-07-10 SKW296Y - Jul 10, 04:15 UTCJul 10, 05:55 UTC1h 40m
2026-07-10 SKW296Y LAX → ABQ Jul 10, 04:25 UTCJul 10, 05:45 UTC1h 20m
2026-07-10 SKW4946 - Jul 10, 02:45 UTCJul 10, 03:30 UTC45m
2026-07-10 SKW6190 LAX → LAS Jul 10, 01:00 UTCJul 10, 01:50 UTC50m
2026-07-10 SKW6190 LAX → LAS Jul 10, 01:00 UTCJul 10, 01:47 UTC47m
2026-07-09 SKW6272 OKC → LAX Jul 9, 19:35 UTCJul 9, 22:20 UTC2h 45m
2026-07-09 SKW6272 OKC → LAX Jul 9, 19:31 UTCJul 9, 22:13 UTC2h 42m
2026-07-09 SKW6272 - Jul 9, 16:15 UTCJul 9, 18:50 UTC2h 35m
2026-07-09 SKW4919 - Jul 9, 13:15 UTCJul 9, 15:05 UTC1h 50m
2026-07-09 SKW296Y - Jul 9, 03:15 UTCJul 9, 04:55 UTC1h 40m
2026-07-09 SKW4946 - Jul 9, 01:25 UTCJul 9, 02:10 UTC45m
2026-07-08 SKW6190 - Jul 8, 23:15 UTCJul 9, 00:10 UTC55m
2026-07-08 SKW6272 - Jul 8, 19:40 UTCJul 8, 22:10 UTC2h 30m
2026-07-08 SKW6272 - Jul 8, 15:45 UTCJul 8, 18:15 UTC2h 30m
2026-07-08 SKW6393 TUS → LAX Jul 8, 13:10 UTCJul 8, 14:20 UTC1h 10m
2026-07-08 SKW6370 PHX → TUS Jul 8, 02:20 UTCJul 8, 02:45 UTC25m
2026-07-08 SKW6370 PHX → TUS Jul 8, 02:16 UTCJul 8, 02:40 UTC24m
2026-07-07 SKW6415 BUR → PHX Jul 7, 23:50 UTCJul 8, 01:00 UTC1h 10m
2026-07-07 SKW6415 BUR → PHX Jul 7, 23:50 UTCJul 8, 00:57 UTC1h 7m

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, SKW6415, SKW6220, SKW4925, SKW6224.