Apparatus

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sensors Mode-S transponder

A2FAD8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N291SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2FAD8
Octal
50575330
Decimal
10,681,048
Country
US
Tail
N291SY
Type
E75L
No current signal · last broadcast 58m ago
Flights observed
325
Distinct callsigns
20
Country
US
Last broadcast
58m ago

Last known position

Most recent position reported by Mode-S A2FAD8.

Country allocation

The ICAO 24-bit address A2FAD8 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
SKW3824 SkyWest Airlines 11 2026-05-29
SKW4454 SkyWest Airlines 9 2026-06-05
SKW4048 SkyWest Airlines 8 2026-06-05
SKW3955 SkyWest Airlines 8 2026-05-31
SKW3887 SkyWest Airlines 8 2026-05-30
SKW3895 SkyWest Airlines 7 2026-06-05
SKW3786 SkyWest Airlines 7 2026-05-08
SKW3748 SkyWest Airlines 7 2026-05-29
SKW132K SkyWest Airlines 7 2026-05-30
SKW3922 SkyWest Airlines 6 2026-04-27
SKW4128 SkyWest Airlines 5 2026-05-30
SKW4052 SkyWest Airlines 5 2026-05-04
SKW4012 SkyWest Airlines 5 2026-06-03
SKW3845 SkyWest Airlines 5 2026-06-05
SKW3737 SkyWest Airlines 5 2026-05-25
SKW3718 SkyWest Airlines 5 2026-05-21
SKW4155 SkyWest Airlines 4 2026-06-02
SKW4149 SkyWest Airlines 4 2026-06-02
SKW4141 SkyWest Airlines 4 2026-05-25
SKW3992 SkyWest Airlines 4 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-05 SKW3895 DTW → ALB Jun 5, 23:25 UTCJun 5, 23:45 UTC20m
2026-06-05 SKW4454 HSV → DTW Jun 5, 21:30 UTCJun 5, 22:05 UTC35m
2026-06-05 SKW4454 HSV → DTW Jun 5, 19:35 UTCJun 5, 20:00 UTC25m
2026-06-05 SKW4048 ATL → FWA Jun 5, 17:50 UTCJun 5, 18:25 UTC35m
2026-06-05 SKW4048 ATL → FWA Jun 5, 16:05 UTCJun 5, 16:25 UTC20m
2026-06-05 SKW3862 ATL → SBN Jun 5, 12:10 UTCJun 5, 12:40 UTC30m
2026-06-05 SKW3845 SLC → GTF Jun 5, 03:05 UTCJun 5, 03:35 UTC30m
2026-06-05 SKW3845 SLC → GTF Jun 5, 03:02 UTCJun 5, 04:07 UTC1h 5m
2026-06-05 SKW3895 DTW → ALB Jun 5, 01:15 UTCJun 5, 01:50 UTC35m
2026-06-04 SKW3895 DTW → ALB Jun 4, 23:30 UTCJun 4, 23:55 UTC25m
2026-06-04 SKW4454 HSV → DTW Jun 4, 21:35 UTCJun 4, 22:15 UTC40m
2026-06-04 SKW4454 HSV → DTW Jun 4, 21:34 UTCJun 4, 22:09 UTC35m
2026-06-04 SKW4454 HSV → DTW Jun 4, 19:50 UTCJun 4, 20:15 UTC25m
2026-06-04 SKW4048 ATL → FWA Jun 4, 16:25 UTCJun 4, 18:45 UTC2h 20m
2026-06-04 SKW4037 SUN → SLC Jun 4, 13:40 UTCJun 4, 14:05 UTC25m
2026-06-04 SKW3985 CLE → BOS Jun 4, 03:05 UTCJun 4, 03:30 UTC25m
2026-06-04 SKW3985 CLE → BOS Jun 4, 03:12 UTCJun 4, 03:41 UTC29m
2026-06-04 SKW3895 DTW → ALB Jun 4, 01:35 UTCJun 4, 02:15 UTC40m
2026-06-04 SKW3895 DTW → ALB Jun 4, 00:10 UTCJun 4, 00:35 UTC25m
2026-06-03 SKW4454 HSV → DTW Jun 3, 22:50 UTCJun 3, 23:25 UTC35m
2026-06-03 SKW4454 HSV → DTW Jun 3, 21:25 UTCJun 3, 21:50 UTC25m
2026-06-03 SKW4048 ATL → FWA Jun 3, 20:35 UTCJun 3, 21:20 UTC45m
2026-06-03 SKW4048 ATL → FWA Jun 3, 19:55 UTCJun 3, 20:25 UTC30m
2026-06-03 SKW4048 ATL → FWA Jun 3, 18:05 UTCJun 3, 18:30 UTC25m
2026-06-03 SKW4012 SLC → ABQ Jun 3, 01:55 UTCJun 3, 03:05 UTC1h 10m
2026-06-02 SKW4012 SLC → ABQ Jun 2, 23:35 UTCJun 3, 00:55 UTC1h 20m
2026-06-02 SKW4155 SLC → BZN Jun 2, 20:40 UTCJun 2, 22:10 UTC1h 30m
2026-06-02 SKW4155 SLC → BZN Jun 2, 20:42 UTCJun 2, 22:05 UTC1h 23m
2026-06-02 SKW4149 EUG → SEA Jun 2, 18:45 UTCJun 2, 19:25 UTC40m
2026-06-02 SKW4075 LAX → OAK Jun 2, 15:30 UTCJun 2, 17:05 UTC1h 35m
2026-06-02 SKW4075 LAX → OAK Jun 2, 15:39 UTCJun 2, 16:55 UTC1h 16m
2026-06-02 SKW4131 HRL → AUS Jun 2, 03:10 UTCJun 2, 04:30 UTC1h 20m
2026-06-02 SKW3688 DTW → CMH Jun 2, 00:15 UTCJun 2, 01:20 UTC1h 5m
2026-06-02 SKW3688 DTW → CMH Jun 2, 00:12 UTCJun 2, 01:15 UTC1h 3m
2026-06-01 SKW3688 DTW → CMH Jun 1, 21:50 UTCJun 1, 22:50 UTC1h 0m
2026-06-01 SKW3992 MSP → FSD Jun 1, 19:50 UTCJun 1, 20:25 UTC35m
2026-06-01 SKW3992 MSP → FSD Jun 1, 18:05 UTCJun 1, 18:40 UTC35m
2026-06-01 SKW3749 ALB → DTW Jun 1, 15:40 UTCJun 1, 16:20 UTC40m
2026-06-01 SKW3873 MKE → BOS Jun 1, 04:40 UTCJun 1, 05:20 UTC40m
2026-06-01 SKW3832 GEG → SEA Jun 1, 02:35 UTCJun 1, 03:35 UTC1h 0m
2026-06-01 SKW3832 GEG → SEA Jun 1, 02:45 UTCJun 1, 03:24 UTC39m
2026-06-01 SKW3832 GEG → SEA Jun 1, 00:50 UTCJun 1, 01:30 UTC40m
2026-05-31 SKW3955 ATL → MGM May 31, 22:40 UTCMay 31, 23:15 UTC35m
2026-05-31 SKW3955 ATL → MGM May 31, 22:44 UTCMay 31, 23:04 UTC20m
2026-05-31 SKW3955 ATL → MGM May 31, 20:50 UTCMay 31, 21:25 UTC35m
2026-05-31 SKW112J YVR → SEA May 31, 18:35 UTCMay 31, 19:10 UTC35m
2026-05-31 SKW123J SEA → YVR May 31, 16:40 UTCMay 31, 17:10 UTC30m
2026-05-31 SKW3965 ATL → ABY May 31, 14:15 UTCMay 31, 14:45 UTC30m
2026-05-31 SKW3965 ATL → ABY May 31, 14:13 UTCMay 31, 14:42 UTC29m
2026-05-31 SKW127T MFR → SEA May 31, 00:40 UTCMay 31, 01:11 UTC31m

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 N291SY page for operator, model, and routing details .

Mode-S A2FAD8 frequently asked

What is Mode-S code A2FAD8?
A2FAD8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N291SY.
Where is Mode-S A2FAD8 registered?
Mode-S code A2FAD8 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 A2FAD8 broadcasting right now?
No active broadcast right now. Last signal was 58m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2FAD8, octal 50575330, decimal 10,681,048.
What flights does A2FAD8 operate?
Mode-S A2FAD8 has broadcast 20 distinct callsigns, including SKW3824, SKW4454, SKW4048, SKW3955, SKW3887.