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sensors Mode-S transponder

A2F721

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N290SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2F721
Octal
50573441
Decimal
10,680,097
Country
US
Tail
N290SY
Type
E75L
Broadcasting now · callsign SKW116X · 35,000 ft
Flights observed
650
Distinct callsigns
20
Country
US
Last broadcast
39m ago

Current position

A2F721 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2F721 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
SKW3857 SkyWest Airlines 22 2026-06-04
SKW4125 SkyWest Airlines 19 2026-06-03
SKW3852 - 15 2026-07-06
SKW3933 - 14 2026-07-13
SKW3777 - 13 2026-07-05
SKW4062 SkyWest Airlines 12 2026-06-08
SKW3987 SkyWest Airlines 12 2026-06-03
SKW146A SkyWest Airlines 11 2026-06-03
SKW4138 - 10 2026-06-26
SKW3774 - 10 2026-06-26
SKW3735 SkyWest Airlines 10 2026-05-16
SKW3732 - 10 2026-07-14
SKW3707 SkyWest Airlines 10 2026-05-05
SKW3786 SkyWest Airlines 9 2026-05-25
SKW3719 SkyWest Airlines 9 2026-07-01
SKW3584 - 9 2026-07-07
SKW4042 SkyWest Airlines 8 2026-06-29
SKW4036 SkyWest Airlines 8 2026-06-11
SKW4019 - 8 2026-07-07
SKW3726 - 8 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW116X - Jul 14, 20:00 UTCJul 14, 20:15 UTC15m
2026-07-14 SKW3694 - Jul 14, 17:20 UTCJul 14, 18:35 UTC1h 15m
2026-07-14 SKW3694 - Jul 14, 14:20 UTCJul 14, 15:25 UTC1h 5m
2026-07-14 SKW3839 SLC → SLC Jul 14, 03:20 UTCJul 14, 12:50 UTC9h 30m
2026-07-14 SKW3732 - Jul 14, 00:45 UTCJul 14, 01:50 UTC1h 5m
2026-07-14 SKW3732 RNO → SLC Jul 14, 00:58 UTCJul 14, 01:41 UTC43m
2026-07-13 SKW3732 - Jul 13, 22:35 UTCJul 13, 23:00 UTC25m
2026-07-13 SKW3933 BUR → SLC Jul 13, 19:50 UTCJul 13, 21:10 UTC1h 20m
2026-07-13 SKW3933 - Jul 13, 17:35 UTCJul 13, 19:05 UTC1h 30m
2026-07-13 SKW3708 EUG → SLC Jul 13, 13:10 UTCJul 13, 14:40 UTC1h 30m
2026-07-13 SKW137C SLC → EUG Jul 13, 05:01 UTCJul 13, 06:30 UTC1h 30m
2026-07-13 SKW3726 - Jul 13, 02:05 UTCJul 13, 03:15 UTC1h 10m
2026-07-12 SKW3726 SLC → ABQ Jul 12, 23:40 UTCJul 13, 01:01 UTC1h 20m
2026-07-12 SKW3908 AUS → SLC Jul 12, 19:50 UTCJul 12, 22:25 UTC2h 35m
2026-07-12 SKW3960 - Jul 12, 16:40 UTCJul 12, 18:25 UTC1h 45m
2026-07-12 SKW3960 BNA → AUS Jul 12, 16:43 UTCJul 12, 18:25 UTC1h 42m
2026-07-12 SKW3960 AUS → BNA Jul 12, 13:40 UTCJul 12, 15:35 UTC1h 55m
2026-07-12 SKW3915 BZN → AUS Jul 12, 01:56 UTCJul 12, 04:30 UTC2h 34m
2026-07-11 SKW3915 SLC → AUS Jul 11, 23:50 UTCJul 12, 04:25 UTC4h 35m
2026-07-11 SKW4134 OAK → SLC Jul 11, 21:40 UTCJul 11, 23:05 UTC1h 25m
2026-07-11 SKW4134 SLC → OAK Jul 11, 19:15 UTCJul 11, 20:45 UTC1h 30m
2026-07-11 SKW3944 - Jul 11, 17:40 UTCJul 11, 18:20 UTC40m
2026-07-11 SKW3944 IDA → SLC Jul 11, 17:44 UTCJul 11, 18:14 UTC30m
2026-07-11 SKW3944 - Jul 11, 15:45 UTCJul 11, 16:15 UTC30m
2026-07-11 SKW3845 SLC → SLC Jul 11, 03:15 UTCJul 11, 12:50 UTC9h 35m
2026-07-10 SKW3800 SLC → SLC Jul 10, 22:40 UTCJul 11, 02:00 UTC3h 20m
2026-07-10 SKW3933 BUR → SLC Jul 10, 19:45 UTCJul 10, 21:10 UTC1h 25m
2026-07-10 SKW3933 SLC → BUR Jul 10, 16:55 UTCJul 10, 18:35 UTC1h 40m
2026-07-10 SKW3607 - Jul 10, 14:35 UTCJul 10, 15:25 UTC50m
2026-07-10 SKW4446 - Jul 10, 03:05 UTCJul 10, 03:50 UTC45m
2026-07-10 SKW160Y - Jul 10, 01:20 UTCJul 10, 01:45 UTC25m
2026-07-10 SKW160Y IDA → SLC Jul 10, 01:24 UTCJul 10, 01:44 UTC20m
2026-07-09 SKW3895 - Jul 9, 23:30 UTCJul 9, 23:55 UTC25m
2026-07-09 SKW3916 BZN → SLC Jul 9, 21:26 UTCJul 9, 22:24 UTC58m
2026-07-09 SKW4104 SEA → SLC Jul 9, 19:05 UTCJul 9, 22:25 UTC3h 20m
2026-07-09 SKW3740 - Jul 9, 15:05 UTCJul 9, 16:15 UTC1h 10m
2026-07-09 SKW4148 - Jul 9, 03:10 UTCJul 9, 04:40 UTC1h 30m
2026-07-08 SKW3799 - Jul 8, 23:40 UTCJul 9, 01:55 UTC2h 15m
2026-07-08 SKW3794 - Jul 8, 20:10 UTCJul 8, 22:15 UTC2h 5m
2026-07-08 SKW4119 - Jul 8, 17:50 UTCJul 8, 18:50 UTC1h 0m
2026-07-08 SKW4119 - Jul 8, 15:25 UTCJul 8, 16:25 UTC1h 0m
2026-07-08 SKW3502 - Jul 8, 13:25 UTCJul 8, 14:40 UTC1h 15m
2026-07-08 SKW4054 SLC → TUS Jul 8, 02:35 UTCJul 8, 04:00 UTC1h 25m
2026-07-08 SKW3903 OAK → SLC Jul 8, 00:15 UTCJul 8, 01:40 UTC1h 25m
2026-07-07 SKW3903 SLC → OAK Jul 7, 21:30 UTCJul 7, 23:05 UTC1h 35m
2026-07-07 SKW4019 - Jul 7, 19:40 UTCJul 7, 20:20 UTC40m
2026-07-07 SKW172E - Jul 7, 17:35 UTCJul 7, 18:15 UTC40m
2026-07-07 SKW105W YVR → SLC Jul 7, 14:10 UTCJul 7, 15:55 UTC1h 45m
2026-07-07 SKW3584 - Jul 7, 05:30 UTCJul 7, 05:35 UTC5m
2026-07-07 SKW3584 SLC → YVR Jul 7, 03:30 UTCJul 7, 05:35 UTC2h 5m

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 N290SY page for operator, model, and routing details .

Mode-S A2F721 frequently asked

What is Mode-S code A2F721?
A2F721 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N290SY.
Where is Mode-S A2F721 registered?
Mode-S code A2F721 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 A2F721 broadcasting right now?
Yes. Mode-S A2F721 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2F721, octal 50573441, decimal 10,680,097.
What flights does A2F721 operate?
Mode-S A2F721 has broadcast 20 distinct callsigns, including SKW3857, SKW4125, SKW3852, SKW3933, SKW3777.