Apparatus

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sensors Mode-S transponder

A2D359

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N281SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2D359
Octal
50551531
Decimal
10,670,937
Country
US
Tail
N281SY
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
647
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A2D359.

Country allocation

The ICAO 24-bit address A2D359 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
SKW3853 SkyWest Airlines 14 2026-07-23
SKW3918 - 13 2026-07-15
SKW3852 SkyWest Airlines 13 2026-07-25
SKW4125 - 12 2026-07-19
SKW4084 SkyWest Airlines 11 2026-06-05
SKW4141 - 10 2026-07-07
SKW3935 SkyWest Airlines 10 2026-06-02
SKW3816 - 10 2026-07-19
SKW3786 SkyWest Airlines 10 2026-07-22
SKW3735 SkyWest Airlines 10 2026-07-20
SKW3897 SkyWest Airlines 9 2026-07-24
SKW4155 SkyWest Airlines 8 2026-07-21
SKW4062 - 8 2026-07-15
SKW3833 SkyWest Airlines 8 2026-05-30
SKW3728 SkyWest Airlines 8 2026-07-26
SKW4153 SkyWest Airlines 7 2026-07-19
SKW3985 SkyWest Airlines 7 2026-06-06
SKW3777 - 7 2026-06-21
SKW3768 - 7 2026-07-17
SKW3727 SkyWest Airlines 7 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3728 MSP → SDF Jul 26, 22:10 UTCJul 26, 22:15 UTC5m
2026-07-26 SKW3727 SLC → RDM Jul 26, 19:25 UTCJul 26, 20:50 UTC1h 25m
2026-07-26 SKW3727 SLC → RDM Jul 26, 17:10 UTCJul 26, 18:30 UTC1h 20m
2026-07-26 SKW174P YYC → SLC Jul 26, 14:05 UTCJul 26, 16:00 UTC1h 55m
2026-07-26 SKW154F SLC → YYC Jul 26, 03:00 UTCJul 26, 04:40 UTC1h 40m
2026-07-26 SKW3728 MSP → SDF Jul 26, 00:35 UTCJul 26, 01:55 UTC1h 20m
2026-07-25 SKW3728 MSP → SDF Jul 25, 22:05 UTCJul 25, 23:10 UTC1h 5m
2026-07-25 SKW3859 LAX → OAK Jul 25, 17:10 UTCJul 25, 20:50 UTC3h 40m
2026-07-25 SKW4069 BWI → BOS Jul 25, 14:10 UTCJul 25, 15:55 UTC1h 45m
2026-07-25 SKW4069 BWI → BOS Jul 25, 14:04 UTCJul 25, 15:49 UTC1h 45m
2026-07-25 SKW3803 DTW → MSN Jul 25, 03:35 UTCJul 25, 05:15 UTC1h 40m
2026-07-25 SKW3852 FWA → MSP Jul 25, 01:10 UTCJul 25, 02:20 UTC1h 10m
2026-07-25 SKW3852 FWA → MSP Jul 25, 01:01 UTCJul 25, 02:19 UTC1h 18m
2026-07-24 SKW3852 FWA → MSP Jul 24, 22:05 UTCJul 25, 00:05 UTC2h 0m
2026-07-24 SKW3727 SLC → RDM Jul 24, 19:30 UTCJul 24, 21:00 UTC1h 30m
2026-07-24 SKW3727 SLC → RDM Jul 24, 17:20 UTCJul 24, 18:40 UTC1h 20m
2026-07-24 SKW105W YWG → MSP Jul 24, 14:00 UTCJul 24, 15:55 UTC1h 55m
2026-07-24 SKW146A ATL → SBN Jul 24, 04:15 UTCJul 24, 04:50 UTC35m
2026-07-24 SKW3897 MLI → ATL Jul 24, 01:10 UTCJul 24, 02:50 UTC1h 40m
2026-07-23 SKW3897 MLI → ATL Jul 23, 22:05 UTCJul 24, 00:05 UTC2h 0m
2026-07-23 SKW4139 RAP → MSP Jul 23, 19:50 UTCJul 23, 20:35 UTC45m
2026-07-23 SKW155A - Jul 23, 17:00 UTCJul 23, 18:35 UTC1h 35m
2026-07-23 SKW3769 MFR → SLC Jul 23, 12:30 UTCJul 23, 13:55 UTC1h 25m
2026-07-23 SKW3722 SEA → SJC Jul 23, 05:05 UTCJul 23, 06:35 UTC1h 30m
2026-07-23 SKW3853 SJC → SEA Jul 23, 00:00 UTCJul 23, 01:40 UTC1h 40m
2026-07-22 SKW3853 SJC → SEA Jul 22, 21:15 UTCJul 22, 23:00 UTC1h 45m
2026-07-22 SKW3786 IND → LGA Jul 22, 17:00 UTCJul 22, 18:10 UTC1h 10m
2026-07-22 SKW3786 IND → LGA Jul 22, 14:15 UTCJul 22, 15:25 UTC1h 10m
2026-07-21 SKW3676 SLC → SLC Jul 21, 23:40 UTCJul 22, 02:40 UTC3h 0m
2026-07-21 SKW4155 SLC → BZN Jul 21, 20:55 UTCJul 21, 22:40 UTC1h 45m
2026-07-21 SKW4155 SLC → BZN Jul 21, 20:44 UTCJul 21, 22:31 UTC1h 47m
2026-07-21 SKW4149 EUG → SEA Jul 21, 19:00 UTCJul 21, 19:55 UTC55m
2026-07-21 SKW4075 LAX → OAK Jul 21, 15:00 UTCJul 21, 16:20 UTC1h 20m
2026-07-21 SKW4131 HRL → AUS Jul 21, 03:55 UTCJul 21, 05:25 UTC1h 30m
2026-07-21 SKW3968 BOS → MKE Jul 21, 01:26 UTCJul 21, 01:57 UTC31m
2026-07-21 SKW3968 BOS → MKE Jul 21, 01:30 UTCJul 21, 02:05 UTC35m
2026-07-20 SKW3733 DTW → CMH Jul 20, 23:50 UTCJul 21, 00:15 UTC25m
2026-07-20 SKW3735 SJC → LAX Jul 20, 21:25 UTCJul 20, 22:10 UTC45m
2026-07-20 SKW3735 SJC → LAX Jul 20, 19:35 UTCJul 20, 20:25 UTC50m
2026-07-20 SKW4075 LAX → OAK Jul 20, 15:30 UTCJul 20, 16:50 UTC1h 20m
2026-07-20 SKW4131 HRL → AUS Jul 20, 03:40 UTCJul 20, 05:10 UTC1h 30m
2026-07-20 SKW3968 BOS → MKE Jul 20, 00:55 UTCJul 20, 01:30 UTC35m
2026-07-19 SKW3733 DTW → CMH Jul 19, 23:10 UTCJul 19, 23:35 UTC25m
2026-07-19 SKW4125 SMF → SEA Jul 19, 20:40 UTCJul 19, 22:00 UTC1h 20m
2026-07-19 SKW4125 SMF → SEA Jul 19, 20:41 UTCJul 19, 21:52 UTC1h 11m
2026-07-19 SKW4125 BFI → SMF Jul 19, 18:10 UTCJul 19, 19:45 UTC1h 35m
2026-07-19 SKW3816 - Jul 19, 15:05 UTCJul 19, 17:05 UTC2h 0m
2026-07-19 SKW3884 SEA → ONT Jul 19, 03:35 UTCJul 19, 05:55 UTC2h 20m
2026-07-19 SKW4153 OAK → LAX Jul 19, 00:55 UTCJul 19, 02:15 UTC1h 20m
2026-07-18 SKW4153 OAK → LAX Jul 18, 22:15 UTCJul 18, 23:45 UTC1h 30m

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 N281SY page for operator, model, and routing details .

Mode-S A2D359 frequently asked

What is Mode-S code A2D359?
A2D359 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N281SY.
Where is Mode-S A2D359 registered?
Mode-S code A2D359 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 A2D359 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 A2D359, octal 50551531, decimal 10,670,937.
What flights does A2D359 operate?
Mode-S A2D359 has broadcast 20 distinct callsigns, including SKW3853, SKW3918, SKW3852, SKW4125, SKW4084.