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sensors Mode-S transponder

A4C492

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N406SY · EMBRAER ERJ-170-100 · operated by SKYWEST AIRLINES INC

Hex
A4C492
Octal
51142222
Decimal
10,798,226
Country
US
Tail
N406SY
Type
E170
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
702
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A4C492.

Country allocation

The ICAO 24-bit address A4C492 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
SKW3450 - 13 2026-07-17
SKW3467 - 10 2026-07-17
SKW3385 - 10 2026-07-18
SKW3208 - 10 2026-07-02
SKW3054 SkyWest Airlines 8 2026-07-21
SKW3494 SkyWest Airlines 7 2026-07-02
SKW3254 - 7 2026-07-14
SKW3251 - 7 2026-07-02
SKW3048 - 7 2026-07-18
SKW3033 SkyWest Airlines 7 2026-05-17
SKW3030 - 7 2026-07-20
SKW3498 - 6 2026-07-07
SKW3433 SkyWest Airlines 6 2026-06-01
SKW3410 - 6 2026-06-30
SKW3305 SkyWest Airlines 6 2026-07-20
SKW3285 SkyWest Airlines 6 2026-07-06
SKW3284 SkyWest Airlines 6 2026-07-03
SKW3223 SkyWest Airlines 6 2026-07-22
SKW3138 - 6 2026-07-14
SKW3002 SkyWest Airlines 6 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3123 LTO → DFW Jul 26, 20:55 UTCJul 26, 22:30 UTC1h 35m
2026-07-26 SKW3112 LAX → PDX Jul 26, 18:35 UTCJul 26, 20:00 UTC1h 25m
2026-07-26 SKW3201 LAX → RNO Jul 26, 15:40 UTCJul 26, 16:35 UTC55m
2026-07-26 SKW3198 SAN → SMF Jul 26, 13:50 UTCJul 26, 14:35 UTC45m
2026-07-26 SKW3198 SAN → SMF Jul 26, 14:00 UTCJul 26, 14:30 UTC30m
2026-07-26 SKW3096 EUG → SEA Jul 26, 02:25 UTCJul 26, 02:35 UTC10m
2026-07-26 SKW3096 EUG → SEA Jul 26, 00:50 UTCJul 26, 01:40 UTC50m
2026-07-25 SKW3095 ACT → DFW Jul 25, 23:15 UTCJul 25, 23:25 UTC10m
2026-07-25 SKW3095 ACT → DFW Jul 25, 21:15 UTCJul 25, 23:25 UTC2h 10m
2026-07-25 SKW3095 ACT → DFW Jul 25, 21:15 UTCJul 25, 23:00 UTC1h 45m
2026-07-25 SKW3209 FAT → SEA Jul 25, 18:40 UTCJul 25, 20:05 UTC1h 25m
2026-07-25 SKW3116 SLC → SAN Jul 25, 16:00 UTCJul 25, 17:40 UTC1h 40m
2026-07-25 SKW3096 EUG → SEA Jul 25, 00:15 UTCJul 25, 02:00 UTC1h 45m
2026-07-24 SKW3095 ACT → DFW Jul 24, 21:15 UTCJul 24, 23:10 UTC1h 55m
2026-07-24 SKW3209 FAT → SEA Jul 24, 18:40 UTCJul 24, 20:05 UTC1h 25m
2026-07-24 SKW3116 SLC → SAN Jul 24, 16:05 UTCJul 24, 17:45 UTC1h 40m
2026-07-24 SKW3331 BOI → SAN Jul 24, 01:05 UTCJul 24, 02:45 UTC1h 40m
2026-07-23 SKW3084 SBN → DFW Jul 23, 21:10 UTCJul 23, 23:45 UTC2h 35m
2026-07-23 SKW3085 IDA → SEA Jul 23, 16:30 UTCJul 23, 19:10 UTC2h 40m
2026-07-23 SKW3207 STS → BUR Jul 23, 13:25 UTCJul 23, 15:15 UTC1h 50m
2026-07-23 SKW3321 BOI → SEA Jul 23, 03:15 UTCJul 23, 04:40 UTC1h 25m
2026-07-23 SKW3466 - Jul 23, 00:50 UTCJul 23, 01:55 UTC1h 5m
2026-07-22 SKW3093 LAX → SFO Jul 22, 22:41 UTCJul 22, 23:34 UTC53m
2026-07-22 SKW3093 LAX → SFO Jul 22, 22:30 UTCJul 22, 23:35 UTC1h 5m
2026-07-22 SKW3223 RDM → BUR Jul 22, 18:30 UTCJul 22, 20:15 UTC1h 45m
2026-07-22 SKW3224 ORD → DTW Jul 22, 15:35 UTCJul 22, 17:10 UTC1h 35m
2026-07-22 SKW3260 EUG → BUR Jul 22, 03:40 UTCJul 22, 05:25 UTC1h 45m
2026-07-22 SKW3199 SAN → SMF Jul 22, 02:00 UTCJul 22, 02:30 UTC30m
2026-07-22 SKW3199 SAN → SMF Jul 22, 02:11 UTCJul 22, 02:40 UTC29m
2026-07-21 SKW3089 RNO → SEA Jul 21, 23:40 UTCJul 22, 00:55 UTC1h 15m
2026-07-21 SKW9799 - Jul 21, 21:20 UTCJul 21, 22:35 UTC1h 15m
2026-07-21 SKW3111 - Jul 21, 19:00 UTCJul 21, 20:15 UTC1h 15m
2026-07-21 SKW3079 - Jul 21, 16:30 UTCJul 21, 17:35 UTC1h 5m
2026-07-21 SKW3054 YVR → SEA Jul 21, 13:55 UTCJul 21, 14:55 UTC1h 0m
2026-07-21 SKW3054 YVR → SEA Jul 21, 13:39 UTCJul 21, 14:53 UTC1h 14m
2026-07-21 SKW3423 - Jul 21, 03:15 UTCJul 21, 04:10 UTC55m
2026-07-21 SKW3423 SEA → IDA Jul 21, 03:11 UTCJul 21, 04:32 UTC1h 21m
2026-07-21 SKW3306 OAK → PDX Jul 21, 01:10 UTCJul 21, 02:05 UTC55m
2026-07-20 SKW3305 LAX → SFO Jul 20, 23:05 UTCJul 20, 23:45 UTC40m
2026-07-20 SKW3294 GEG → SEA Jul 20, 21:20 UTCJul 20, 21:50 UTC30m
2026-07-20 SKW3294 GEG → SEA Jul 20, 19:35 UTCJul 20, 20:00 UTC25m
2026-07-20 SKW3089 RNO → SEA Jul 20, 16:35 UTCJul 20, 17:55 UTC1h 20m
2026-07-20 SKW3353 RDM → SFO Jul 20, 14:10 UTCJul 20, 15:15 UTC1h 5m
2026-07-20 SKW3109 - Jul 20, 12:30 UTCJul 20, 13:05 UTC35m
2026-07-20 SKW3066 LAS → SAN Jul 20, 05:05 UTCJul 20, 05:35 UTC30m
2026-07-20 SKW3030 SJC → PDX Jul 20, 02:00 UTCJul 20, 03:30 UTC1h 30m
2026-07-20 SKW3030 SJC → PDX Jul 20, 01:55 UTCJul 20, 03:11 UTC1h 16m
2026-07-19 SKW3029 SAN → SJC Jul 19, 23:35 UTCJul 20, 00:40 UTC1h 5m
2026-07-19 SKW3123 LTO → DFW Jul 19, 20:50 UTCJul 19, 22:25 UTC1h 35m
2026-07-19 SKW3123 LTO → DFW Jul 19, 21:00 UTCJul 19, 22:20 UTC1h 20m

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 N406SY page for operator, model, and routing details .

Mode-S A4C492 frequently asked

What is Mode-S code A4C492?
A4C492 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N406SY.
Where is Mode-S A4C492 registered?
Mode-S code A4C492 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 A4C492 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C492, octal 51142222, decimal 10,798,226.
What flights does A4C492 operate?
Mode-S A4C492 has broadcast 20 distinct callsigns, including SKW3450, SKW3467, SKW3385, SKW3208, SKW3054.