Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 10h ago
Flights observed
638
Distinct callsigns
20
Country
US
Last broadcast
10h 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
SKW3887 - 13 2026-07-17
SKW3735 - 13 2026-07-17
SKW132K - 12 2026-07-17
SKW4125 - 11 2026-07-15
SKW3824 SkyWest Airlines 11 2026-05-29
SKW4141 - 10 2026-07-11
SKW3918 - 10 2026-07-16
SKW3857 - 10 2026-06-30
SKW3748 - 10 2026-07-16
SKW4454 SkyWest Airlines 9 2026-06-05
SKW3749 - 9 2026-07-17
SKW3736 - 9 2026-07-14
SKW4153 - 8 2026-07-15
SKW4052 SkyWest Airlines 8 2026-06-07
SKW4048 SkyWest Airlines 8 2026-06-05
SKW3992 - 8 2026-07-18
SKW3955 SkyWest Airlines 8 2026-05-31
SKW3895 SkyWest Airlines 8 2026-06-06
SKW3873 - 8 2026-07-17
SKW112J - 8 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-21 SKW4446 SLC → BOI Jul 21, 03:00 UTCJul 21, 03:45 UTC45m
2026-07-20 SKW3798 JFK → BNA Jul 20, 23:50 UTCJul 21, 01:05 UTC1h 14m
2026-07-20 SKW3798 JFK → BNA Jul 20, 23:39 UTCJul 21, 00:53 UTC1h 14m
2026-07-20 SKW3798 JFK → BNA Jul 20, 21:20 UTCJul 20, 22:25 UTC1h 5m
2026-07-20 SKW4019 SLC → ABQ Jul 20, 19:40 UTCJul 20, 20:10 UTC30m
2026-07-20 SKW172E SLC → SUN Jul 20, 17:35 UTCJul 20, 18:00 UTC25m
2026-07-20 SKW4037 SUN → SLC Jul 20, 13:30 UTCJul 20, 14:00 UTC30m
2026-07-20 SKW3985 CLE → BOS Jul 20, 03:15 UTCJul 20, 03:40 UTC25m
2026-07-20 SKW3728 MSP → SDF Jul 20, 00:30 UTCJul 20, 01:50 UTC1h 20m
2026-07-19 SKW3728 MSP → SDF Jul 19, 22:05 UTCJul 19, 23:15 UTC1h 10m
2026-07-19 SKW3727 SLC → RDM Jul 19, 19:30 UTCJul 19, 20:50 UTC1h 20m
2026-07-19 SKW3727 SLC → RDM Jul 19, 19:28 UTCJul 19, 20:43 UTC1h 15m
2026-07-19 SKW3727 SLC → RDM Jul 19, 17:10 UTCJul 19, 18:30 UTC1h 20m
2026-07-19 SKW3607 SJC → LAX Jul 19, 14:30 UTCJul 19, 15:15 UTC45m
2026-07-19 SKW4148 - Jul 19, 03:15 UTCJul 19, 04:45 UTC1h 30m
2026-07-18 SKW3799 MDW → MSP Jul 18, 23:35 UTCJul 19, 02:00 UTC2h 25m
2026-07-18 SKW4145 SEA → GEG Jul 18, 21:55 UTCJul 18, 22:35 UTC40m
2026-07-18 SKW3992 - Jul 18, 19:45 UTCJul 18, 20:20 UTC35m
2026-07-18 SKW3992 - Jul 18, 17:55 UTCJul 18, 18:25 UTC30m
2026-07-18 SKW3816 - Jul 18, 13:25 UTCJul 18, 15:30 UTC2h 5m
2026-07-18 SKW3884 SEA → ONT Jul 18, 03:10 UTCJul 18, 05:40 UTC2h 30m
2026-07-18 SKW3968 YVR → SEA Jul 18, 01:05 UTCJul 18, 01:34 UTC30m
2026-07-17 SKW3733 DTW → CMH Jul 17, 23:14 UTCJul 17, 23:50 UTC35m
2026-07-17 SKW3735 - Jul 17, 20:35 UTCJul 17, 21:25 UTC50m
2026-07-17 SKW3735 SEA → RDM Jul 17, 18:40 UTCJul 17, 19:25 UTC45m
2026-07-17 SKW3749 - Jul 17, 16:24 UTCJul 17, 17:20 UTC55m
2026-07-17 SKW3873 - Jul 17, 07:50 UTCJul 17, 08:30 UTC40m
2026-07-17 SKW3887 YVR → SEA Jul 17, 06:15 UTCJul 17, 06:40 UTC25m
2026-07-17 SKW132K SEA → YVR Jul 17, 03:05 UTCJul 17, 03:45 UTC40m
2026-07-17 SKW142Y YVR → SEA Jul 17, 01:15 UTCJul 17, 01:45 UTC30m
2026-07-16 SKW3748 SEA → YVR Jul 16, 23:40 UTCJul 17, 00:14 UTC35m
2026-07-16 SKW3748 SEA → YVR Jul 16, 23:27 UTCJul 17, 00:09 UTC42m
2026-07-16 SKW3818 - Jul 16, 21:35 UTCJul 16, 22:05 UTC30m
2026-07-16 SKW3818 SEA → PDX Jul 16, 17:35 UTCJul 16, 18:10 UTC35m
2026-07-16 SKW3987 YVR → SEA Jul 16, 14:50 UTCJul 16, 15:19 UTC30m
2026-07-16 SKW146A SEA → YVR Jul 16, 03:20 UTCJul 16, 03:50 UTC30m
2026-07-16 SKW146A SEA → YVR Jul 16, 03:16 UTCJul 16, 03:43 UTC27m
2026-07-16 SKW3918 PDX → SEA Jul 16, 01:15 UTCJul 16, 01:45 UTC30m
2026-07-15 SKW3918 SEA → PDX Jul 15, 23:35 UTCJul 16, 00:10 UTC35m
2026-07-15 SKW4125 SMF → SEA Jul 15, 20:20 UTCJul 15, 21:40 UTC1h 20m
2026-07-15 SKW4125 SEA → SMF Jul 15, 17:35 UTCJul 15, 19:10 UTC1h 35m
2026-07-15 SKW3816 - Jul 15, 13:30 UTCJul 15, 15:30 UTC2h 0m
2026-07-15 SKW3884 - Jul 15, 03:20 UTCJul 15, 05:50 UTC2h 30m
2026-07-15 SKW4153 SMF → SEA Jul 15, 00:55 UTCJul 15, 02:10 UTC1h 15m
2026-07-14 SKW4153 SEA → SMF Jul 14, 22:15 UTCJul 14, 23:55 UTC1h 39m
2026-07-14 SKW3736 SJC → SEA Jul 14, 18:55 UTCJul 14, 20:30 UTC1h 35m
2026-07-14 SKW3736 SJC → SEA Jul 14, 18:59 UTCJul 14, 20:25 UTC1h 26m
2026-07-14 SKW3736 - Jul 14, 16:05 UTCJul 14, 18:05 UTC2h 0m
2026-07-14 SKW3887 - Jul 14, 03:00 UTCJul 14, 03:35 UTC35m
2026-07-14 SKW132K SEA → YVR Jul 14, 01:05 UTCJul 14, 01:35 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 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 10h 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 SKW3887, SKW3735, SKW132K, SKW4125, SKW3824.