Apparatus

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sensors Mode-S transponder

A2F111

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N289SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2F111
Octal
50570421
Decimal
10,678,545
Country
US
Tail
N289SY
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
728
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A2F111.

Country allocation

The ICAO 24-bit address A2F111 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
SKW4179 SkyWest Airlines 15 2026-07-25
SKW4108 SkyWest Airlines 15 2026-07-26
SKW4078 SkyWest Airlines 15 2026-07-25
SKW4454 SkyWest Airlines 13 2026-05-21
SKW4449 - 12 2026-07-22
SKW3852 SkyWest Airlines 12 2026-07-23
SKW3786 SkyWest Airlines 12 2026-07-03
SKW4141 - 11 2026-07-19
SKW3853 SkyWest Airlines 11 2026-07-26
SKW4149 SkyWest Airlines 10 2026-07-19
SKW4138 - 10 2026-07-09
SKW4126 SkyWest Airlines 10 2026-07-26
SKW4125 - 10 2026-07-17
SKW4052 SkyWest Airlines 10 2026-05-02
SKW4030 SkyWest Airlines 10 2026-07-24
SKW3944 - 10 2026-07-12
SKW3693 SkyWest Airlines 10 2026-07-21
SKW120W SkyWest Airlines 10 2026-07-24
SKW4048 SkyWest Airlines 9 2026-05-21
SKW3768 - 9 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3853 SJC → SEA Jul 26, 21:15 UTCJul 26, 22:15 UTC1h 0m
2026-07-26 SKW125H ATL → CHA Jul 26, 18:25 UTCJul 26, 19:40 UTC1h 15m
2026-07-26 SKW4108 LAX → ABQ Jul 26, 15:30 UTCJul 26, 17:10 UTC1h 40m
2026-07-26 SKW3969 PIT → BOS Jul 26, 13:15 UTCJul 26, 14:20 UTC1h 5m
2026-07-26 SKW4083 MSP → MDW Jul 26, 04:45 UTCJul 26, 05:45 UTC1h 0m
2026-07-26 SKW4083 MSP → MDW Jul 26, 04:46 UTCJul 26, 05:43 UTC57m
2026-07-26 SKW4126 HPN → DTW Jul 26, 02:15 UTCJul 26, 03:20 UTC1h 5m
2026-07-25 SKW4126 HPN → DTW Jul 25, 23:55 UTCJul 26, 00:50 UTC55m
2026-07-25 SKW4002 LAX → SFO Jul 25, 22:10 UTCJul 25, 22:35 UTC25m
2026-07-25 SKW3741 SAN → LAS Jul 25, 20:10 UTCJul 25, 21:00 UTC50m
2026-07-25 SKW4078 SNA → LAS Jul 25, 17:55 UTCJul 25, 18:40 UTC45m
2026-07-25 SKW4078 SNA → LAS Jul 25, 16:05 UTCJul 25, 16:45 UTC40m
2026-07-25 SKW4179 SEA → EUG Jul 25, 03:10 UTCJul 25, 04:00 UTC50m
2026-07-25 SKW4179 SEA → EUG Jul 25, 01:25 UTCJul 25, 02:10 UTC45m
2026-07-24 SKW3751 DTW → SBN Jul 24, 23:20 UTCJul 25, 00:30 UTC1h 10m
2026-07-24 SKW4001 CMH → MSP Jul 24, 21:45 UTCJul 24, 22:15 UTC30m
2026-07-24 SKW4108 LAX → ABQ Jul 24, 18:45 UTCJul 24, 20:15 UTC1h 30m
2026-07-24 SKW4084 SLC → ABQ Jul 24, 16:30 UTCJul 24, 17:50 UTC1h 20m
2026-07-24 SKW4030 SYR → DTW Jul 24, 13:20 UTCJul 24, 14:35 UTC1h 15m
2026-07-24 SKW120W SLC → PSP Jul 24, 03:00 UTCJul 24, 04:05 UTC1h 5m
2026-07-24 SKW3728 MSP → SDF Jul 24, 00:35 UTCJul 24, 01:50 UTC1h 15m
2026-07-24 SKW3728 MSP → SDF Jul 24, 00:34 UTCJul 24, 01:47 UTC1h 13m
2026-07-23 SKW3728 MSP → SDF Jul 23, 22:15 UTCJul 23, 23:30 UTC1h 15m
2026-07-23 SKW3727 SLC → RDM Jul 23, 19:45 UTCJul 23, 21:10 UTC1h 25m
2026-07-23 SKW3727 SLC → RDM Jul 23, 17:10 UTCJul 23, 18:45 UTC1h 35m
2026-07-23 SKW105W YWG → MSP Jul 23, 14:00 UTCJul 23, 16:00 UTC2h 0m
2026-07-23 SKW3584 SLC → TUL Jul 23, 03:25 UTCJul 23, 05:20 UTC1h 55m
2026-07-23 SKW3852 FWA → MSP Jul 23, 00:45 UTCJul 23, 02:00 UTC1h 15m
2026-07-22 SKW3852 FWA → MSP Jul 22, 22:00 UTCJul 22, 23:15 UTC1h 15m
2026-07-22 SKW4019 SLC → ABQ Jul 22, 19:45 UTCJul 22, 20:20 UTC35m
2026-07-22 SKW172E SLC → SUN Jul 22, 17:50 UTCJul 22, 18:15 UTC25m
2026-07-22 SKW172E SLC → SUN Jul 22, 17:36 UTCJul 22, 18:25 UTC49m
2026-07-22 SKW174P YYC → SLC Jul 22, 14:10 UTCJul 22, 15:45 UTC1h 35m
2026-07-22 SKW154F SLC → YYC Jul 22, 03:50 UTCJul 22, 05:25 UTC1h 35m
2026-07-22 SKW4449 COS → SLC Jul 22, 00:34 UTCJul 22, 01:51 UTC1h 17m
2026-07-22 SKW4449 COS → SLC Jul 22, 00:40 UTCJul 22, 01:55 UTC1h 15m
2026-07-21 SKW4449 SLC → COS Jul 21, 22:05 UTCJul 21, 23:25 UTC1h 20m
2026-07-21 SKW129H YYC → SLC Jul 21, 18:45 UTCJul 21, 20:25 UTC1h 40m
2026-07-21 SKW104T SLC → YYC Jul 21, 15:40 UTCJul 21, 17:25 UTC1h 45m
2026-07-21 SKW3769 MFR → SLC Jul 21, 12:23 UTCJul 21, 13:57 UTC1h 34m
2026-07-21 SKW3722 SEA → SJC Jul 21, 05:20 UTCJul 21, 06:40 UTC1h 20m
2026-07-21 SKW3693 HPN → ATL Jul 21, 00:05 UTCJul 21, 01:30 UTC1h 25m
2026-07-20 SKW3693 HPN → ATL Jul 20, 21:20 UTCJul 20, 22:50 UTC1h 30m
2026-07-20 SKW3694 - Jul 20, 17:15 UTCJul 20, 18:25 UTC1h 10m
2026-07-20 SKW3694 - Jul 20, 14:30 UTCJul 20, 15:40 UTC1h 10m
2026-07-20 SKW3901 HLN → SLC Jul 20, 11:58 UTCJul 20, 12:48 UTC50m
2026-07-20 SKW3839 SLC → HLN Jul 20, 03:35 UTCJul 20, 12:45 UTC9h 10m
2026-07-19 SKW3676 SLC → SLC Jul 19, 23:30 UTCJul 20, 02:40 UTC3h 10m
2026-07-19 SKW4155 SLC → BZN Jul 19, 20:45 UTCJul 19, 22:15 UTC1h 30m
2026-07-19 SKW4149 EUG → SEA Jul 19, 19:00 UTCJul 19, 19:55 UTC55m

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 N289SY page for operator, model, and routing details .

Mode-S A2F111 frequently asked

What is Mode-S code A2F111?
A2F111 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N289SY.
Where is Mode-S A2F111 registered?
Mode-S code A2F111 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 A2F111 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2F111, octal 50570421, decimal 10,678,545.
What flights does A2F111 operate?
Mode-S A2F111 has broadcast 20 distinct callsigns, including SKW4179, SKW4108, SKW4078, SKW4454, SKW4449.