Apparatus

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sensors Mode-S transponder

A2B6FF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N274SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2B6FF
Octal
50533377
Decimal
10,663,679
Country
US
Tail
N274SY
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
598
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A2B6FF.

Country allocation

The ICAO 24-bit address A2B6FF 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
SKW4078 - 23 2026-07-22
SKW4108 SkyWest Airlines 19 2026-07-23
SKW4179 SkyWest Airlines 16 2026-07-22
SKW4087 SkyWest Airlines 12 2026-06-01
SKW3741 SkyWest Airlines 12 2026-07-22
SKW4149 SkyWest Airlines 10 2026-06-05
SKW3601 SkyWest Airlines 10 2026-05-30
SKW4084 SkyWest Airlines 9 2026-07-23
SKW3935 - 9 2026-07-05
SKW3602 SkyWest Airlines 9 2026-05-31
SKW4058 SkyWest Airlines 8 2026-05-30
SKW4012 - 8 2026-07-08
SKW3688 SkyWest Airlines 8 2026-05-16
SKW3641 SkyWest Airlines 8 2026-05-30
SKW4141 SkyWest Airlines 7 2026-05-10
SKW4123 SkyWest Airlines 7 2026-06-01
SKW4070 SkyWest Airlines 7 2026-04-15
SKW3953 SkyWest Airlines 7 2026-05-04
SKW3857 SkyWest Airlines 7 2026-05-08
SKW3853 - 7 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4475 GTF → SLC Jul 26, 21:30 UTCJul 26, 21:45 UTC15m
2026-07-26 SKW4019 SLC → ABQ Jul 26, 20:10 UTCJul 26, 20:45 UTC35m
2026-07-26 SKW172E SLC → SUN Jul 26, 18:20 UTCJul 26, 18:45 UTC25m
2026-07-26 SKW3719 LEX → DTW Jul 26, 16:20 UTCJul 26, 17:20 UTC1h 0m
2026-07-26 SKW3719 LEX → DTW Jul 26, 14:00 UTCJul 26, 14:30 UTC30m
2026-07-25 SKW3841 RNO → LAX Jul 25, 20:05 UTCJul 25, 21:35 UTC1h 30m
2026-07-25 SKW3841 RNO → LAX Jul 25, 17:15 UTCJul 25, 19:00 UTC1h 45m
2026-07-25 SKW3607 SJC → LAX Jul 25, 15:00 UTCJul 25, 15:45 UTC45m
2026-07-25 SKW4446 SLC → BOI Jul 25, 03:40 UTCJul 25, 04:25 UTC45m
2026-07-24 SKW3882 SLC → OKC Jul 24, 23:25 UTCJul 25, 01:45 UTC2h 20m
2026-07-24 SKW116X ATL → SBN Jul 24, 20:05 UTCJul 24, 22:05 UTC2h 0m
2026-07-24 SKW3694 HPN → ATL Jul 24, 17:15 UTCJul 24, 18:25 UTC1h 10m
2026-07-24 SKW3694 HPN → ATL Jul 24, 14:35 UTCJul 24, 15:40 UTC1h 5m
2026-07-24 SKW4105 CLE → DTW Jul 24, 00:20 UTCJul 24, 01:50 UTC1h 30m
2026-07-23 SKW4105 CLE → DTW Jul 23, 21:45 UTCJul 23, 23:20 UTC1h 35m
2026-07-23 SKW4084 SLC → ABQ Jul 23, 19:15 UTCJul 23, 19:45 UTC30m
2026-07-23 SKW4084 SLC → ABQ Jul 23, 19:20 UTCJul 23, 20:24 UTC1h 4m
2026-07-23 SKW4108 LAX → ABQ Jul 23, 16:45 UTCJul 23, 18:20 UTC1h 35m
2026-07-23 SKW3969 PIT → BOS Jul 23, 13:20 UTCJul 23, 14:25 UTC1h 5m
2026-07-23 SKW4083 MSP → MDW Jul 23, 05:25 UTCJul 23, 06:25 UTC1h 0m
2026-07-23 SKW4126 HPN → DTW Jul 23, 02:30 UTCJul 23, 03:30 UTC1h 0m
2026-07-23 SKW4126 HPN → DTW Jul 23, 00:15 UTCJul 23, 01:10 UTC55m
2026-07-22 SKW4002 - Jul 22, 22:25 UTCJul 22, 22:55 UTC30m
2026-07-22 SKW4002 SAN → LAX Jul 22, 22:22 UTCJul 22, 22:47 UTC25m
2026-07-22 SKW3741 SAN → LAS Jul 22, 20:10 UTCJul 22, 21:00 UTC50m
2026-07-22 SKW3741 SAN → LAS Jul 22, 20:10 UTCJul 22, 20:52 UTC42m
2026-07-22 SKW4078 - Jul 22, 18:05 UTCJul 22, 18:50 UTC45m
2026-07-22 SKW4078 - Jul 22, 15:50 UTCJul 22, 16:35 UTC45m
2026-07-22 SKW4179 SEA → EUG Jul 22, 04:35 UTCJul 22, 05:20 UTC45m
2026-07-22 SKW4179 SEA → EUG Jul 22, 01:20 UTCJul 22, 02:00 UTC40m
2026-07-21 SKW3751 - Jul 21, 23:05 UTCJul 21, 23:55 UTC50m
2026-07-21 SKW4001 - Jul 21, 21:25 UTCJul 21, 21:55 UTC30m
2026-07-21 SKW3755 LAX → SMF Jul 21, 18:40 UTCJul 21, 19:45 UTC1h 5m
2026-07-21 SKW3755 LAX → SMF Jul 21, 18:29 UTCJul 21, 19:40 UTC1h 11m
2026-07-21 SKW3755 LAX → SMF Jul 21, 16:20 UTCJul 21, 17:25 UTC1h 5m
2026-07-21 SKW3725 SBN → ATL Jul 21, 13:15 UTCJul 21, 15:10 UTC1h 55m
2026-07-21 SKW4148 LAX → BOI Jul 21, 04:45 UTCJul 21, 06:20 UTC1h 35m
2026-07-21 SKW4126 HPN → DTW Jul 21, 02:20 UTCJul 21, 03:30 UTC1h 10m
2026-07-21 SKW4126 HPN → DTW Jul 21, 00:15 UTCJul 21, 01:15 UTC1h 0m
2026-07-20 SKW4002 - Jul 20, 22:25 UTCJul 20, 22:50 UTC25m
2026-07-20 SKW4002 SAN → LAX Jul 20, 22:24 UTCJul 20, 22:50 UTC26m
2026-07-20 SKW3741 SAN → LAS Jul 20, 20:20 UTCJul 20, 21:10 UTC50m
2026-07-20 SKW4078 - Jul 20, 18:05 UTCJul 20, 18:50 UTC45m
2026-07-20 SKW4078 SNA → LAS Jul 20, 18:07 UTCJul 20, 18:47 UTC40m
2026-07-20 SKW4078 - Jul 20, 16:15 UTCJul 20, 17:00 UTC45m
2026-07-20 SKW4179 SEA → EUG Jul 20, 04:45 UTCJul 20, 05:30 UTC45m
2026-07-20 SKW4179 SEA → EUG Jul 20, 03:15 UTCJul 20, 03:55 UTC40m
2026-07-20 SKW3751 - Jul 20, 00:30 UTCJul 20, 01:35 UTC1h 5m
2026-07-20 SKW3751 SAN → LAS Jul 20, 00:35 UTCJul 20, 01:18 UTC43m
2026-07-19 SKW4001 - Jul 19, 22:40 UTCJul 19, 23:10 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 N274SY page for operator, model, and routing details .

Mode-S A2B6FF frequently asked

What is Mode-S code A2B6FF?
A2B6FF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N274SY.
Where is Mode-S A2B6FF registered?
Mode-S code A2B6FF 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 A2B6FF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B6FF, octal 50533377, decimal 10,663,679.
What flights does A2B6FF operate?
Mode-S A2B6FF has broadcast 20 distinct callsigns, including SKW4078, SKW4108, SKW4179, SKW4087, SKW3741.