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sensors Mode-S transponder

A5287C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N431SY · operated by SKYWEST AIRLINES INC

Hex
A5287C
Octal
51224174
Decimal
10,823,804
Country
US
Tail
N431SY
No current signal · last broadcast Jul 26, 22:10 UTC
Flights observed
544
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:10 UTC

Last known position

Most recent position reported by Mode-S A5287C.

Country allocation

The ICAO 24-bit address A5287C 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
SKW3400 SkyWest Airlines 7 2026-07-22
SKW3063 - 7 2026-07-10
SKW3455 - 6 2026-07-18
SKW3322 - 6 2026-07-21
SKW3086 SkyWest Airlines 6 2026-07-22
SKW3015 - 6 2026-07-09
SKW0431 SkyWest Airlines 6 2026-04-15
SKW431 SkyWest Airlines 5 2026-04-15
SKW3492 SkyWest Airlines 5 2026-07-25
SKW3404 - 5 2026-06-30
SKW3347 SkyWest Airlines 5 2026-07-24
SKW3218 - 5 2026-07-16
SKW3217 SkyWest Airlines 5 2026-06-12
SKW3213 SkyWest Airlines 5 2026-07-22
SKW3114 - 5 2026-07-21
SKW3112 - 5 2026-07-07
SKW3076 SkyWest Airlines 5 2026-07-21
SKW3030 - 5 2026-07-08
SKW3009 SkyWest Airlines 5 2026-07-22
SKW9790 SkyWest Airlines 4 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3360 PDX → SFO Jul 26, 21:00 UTCJul 26, 21:50 UTC50m
2026-07-26 SKW3360 PDX → SFO Jul 26, 19:15 UTCJul 26, 20:00 UTC45m
2026-07-26 SKW3381 STS → SAN Jul 26, 16:10 UTCJul 26, 17:55 UTC1h 45m
2026-07-26 SKW3017 HPN → ORD Jul 26, 02:14 UTCJul 26, 03:24 UTC1h 10m
2026-07-26 SKW3017 HPN → ORD Jul 26, 02:00 UTCJul 26, 03:30 UTC1h 30m
2026-07-25 SKW812T FAT → SAN Jul 25, 23:40 UTCJul 26, 00:30 UTC50m
2026-07-25 SKW3389 SAN → SJC Jul 25, 21:35 UTCJul 25, 22:15 UTC40m
2026-07-25 SKW3479 SJC → BOI Jul 25, 19:10 UTCJul 25, 20:25 UTC1h 15m
2026-07-25 SKW3342 LAX → SFO Jul 25, 16:50 UTCJul 25, 17:50 UTC1h 0m
2026-07-25 SKW3244 SFO → SNA Jul 25, 13:50 UTCJul 25, 14:55 UTC1h 5m
2026-07-25 SKW3244 SFO → SNA Jul 25, 13:56 UTCJul 25, 14:54 UTC58m
2026-07-25 SKW3495 EUG → SEA Jul 25, 04:00 UTCJul 25, 05:05 UTC1h 5m
2026-07-25 SKW3492 SNA → SFO Jul 25, 01:40 UTCJul 25, 02:50 UTC1h 10m
2026-07-24 SKW3080 YYZ → ORD Jul 24, 23:35 UTCJul 25, 00:45 UTC1h 10m
2026-07-24 SKW3081 SMF → SEA Jul 24, 21:25 UTCJul 24, 22:25 UTC1h 0m
2026-07-24 SKW3347 SAN → SFO Jul 24, 18:55 UTCJul 24, 20:10 UTC1h 15m
2026-07-24 SKW3347 SAN → SFO Jul 24, 18:29 UTCJul 24, 19:54 UTC1h 25m
2026-07-24 SKW3235 BOI → SAN Jul 24, 14:10 UTCJul 24, 16:10 UTC2h 0m
2026-07-24 SKW3096 EUG → SEA Jul 24, 00:25 UTCJul 24, 02:15 UTC1h 50m
2026-07-23 SKW3095 ACT → DFW Jul 23, 21:15 UTCJul 23, 23:15 UTC2h 0m
2026-07-23 SKW3209 FAT → SEA Jul 23, 19:20 UTCJul 23, 19:35 UTC15m
2026-07-23 SKW3209 FAT → SEA Jul 23, 18:05 UTCJul 23, 18:50 UTC45m
2026-07-23 SKW3116 SLC → SAN Jul 23, 15:20 UTCJul 23, 17:05 UTC1h 45m
2026-07-23 SKW3375 SJC → PDX Jul 23, 02:45 UTCJul 23, 03:55 UTC1h 10m
2026-07-22 SKW3070 SEA → PSC Jul 22, 23:45 UTCJul 23, 01:50 UTC2h 5m
2026-07-22 SKW3262 BFL → PHX Jul 22, 21:50 UTCJul 22, 22:40 UTC50m
2026-07-22 SKW3009 LRD → DFW Jul 22, 19:25 UTCJul 22, 20:35 UTC1h 10m
2026-07-22 SKW3400 PDX → SFO Jul 22, 16:50 UTCJul 22, 17:55 UTC1h 5m
2026-07-22 SKW3213 RDM → PHX Jul 22, 14:40 UTCJul 22, 15:45 UTC1h 5m
2026-07-22 SKW3086 GRK → DFW Jul 22, 01:50 UTCJul 22, 02:50 UTC1h 0m
2026-07-21 SKW3086 GRK → DFW Jul 21, 23:50 UTCJul 22, 01:00 UTC1h 10m
2026-07-21 SKW3076 HOU → DFW Jul 21, 21:35 UTCJul 21, 22:30 UTC55m
2026-07-21 SKW3049 - Jul 21, 18:45 UTCJul 21, 19:55 UTC1h 10m
2026-07-21 SKW3114 - Jul 21, 16:30 UTCJul 21, 17:40 UTC1h 10m
2026-07-21 SKW3322 MFR → LAX Jul 21, 13:26 UTCJul 21, 14:51 UTC1h 25m
2026-07-21 SKW3322 MFR → LAX Jul 21, 13:15 UTCJul 21, 14:55 UTC1h 40m
2026-07-21 SKW3206 SAN → PDX Jul 21, 04:10 UTCJul 21, 05:40 UTC1h 30m
2026-07-21 SKW3019 SLC → ORD Jul 21, 01:20 UTCJul 21, 02:50 UTC1h 30m
2026-07-20 SKW3120 RNO → PDX Jul 20, 21:45 UTCJul 20, 23:20 UTC1h 35m
2026-07-20 SKW3120 RNO → PDX Jul 20, 21:46 UTCJul 20, 23:16 UTC1h 30m
2026-07-20 SKW3121 - Jul 20, 19:10 UTCJul 20, 20:20 UTC1h 10m
2026-07-20 SKW3110 LAX → SJC Jul 20, 16:55 UTCJul 20, 17:57 UTC1h 2m
2026-07-20 SKW3110 LAX → SJC Jul 20, 16:50 UTCJul 20, 17:55 UTC1h 5m
2026-07-20 SKW3018 DFW → LAW Jul 20, 13:55 UTCJul 20, 15:25 UTC1h 30m
2026-07-20 SKW3017 - Jul 20, 03:25 UTCJul 20, 04:55 UTC1h 30m
2026-07-20 SKW3017 SAN → SLC Jul 20, 02:29 UTCJul 20, 04:55 UTC2h 26m
2026-07-20 SKW3337 - Jul 20, 00:10 UTCJul 20, 01:25 UTC1h 15m
2026-07-19 SKW3208 - Jul 19, 21:05 UTCJul 19, 23:05 UTC2h 0m
2026-07-19 SKW3468 - Jul 19, 18:20 UTCJul 19, 19:35 UTC1h 15m
2026-07-19 SKW3251 - Jul 19, 15:55 UTCJul 19, 16:55 UTC1h 0m

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 N431SY page for operator, model, and routing details .

Mode-S A5287C frequently asked

What is Mode-S code A5287C?
A5287C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N431SY.
Where is Mode-S A5287C registered?
Mode-S code A5287C 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 A5287C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5287C, octal 51224174, decimal 10,823,804.
What flights does A5287C operate?
Mode-S A5287C has broadcast 20 distinct callsigns, including SKW3400, SKW3063, SKW3455, SKW3322, SKW3086.