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sensors Mode-S transponder

A178AE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N194SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A178AE
Octal
50274256
Decimal
10,582,190
Country
US
Tail
N194SY
Type
E75L
No current signal · last broadcast Jul 26, 20:30 UTC
Flights observed
677
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

Last known position

Most recent position reported by Mode-S A178AE.

Country allocation

The ICAO 24-bit address A178AE 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
SKW3361 SkyWest Airlines 8 2026-07-25
SKW3070 - 8 2026-07-06
SKW3345 SkyWest Airlines 7 2026-07-24
SKW3102 - 7 2026-07-17
SKW3044 SkyWest Airlines 7 2026-06-19
SKW3019 - 7 2026-07-08
SKW3385 - 6 2026-07-17
SKW3368 SkyWest Airlines 6 2026-05-10
SKW3331 SkyWest Airlines 6 2026-07-22
SKW3111 - 6 2026-07-17
SKW3079 - 6 2026-07-17
SKW3059 SkyWest Airlines 6 2026-07-23
SKW3048 - 6 2026-07-17
SKW3006 SkyWest Airlines 6 2026-07-08
SKW3493 SkyWest Airlines 5 2026-06-06
SKW3473 SkyWest Airlines 5 2026-05-02
SKW3467 SkyWest Airlines 5 2026-07-26
SKW3402 - 5 2026-07-12
SKW3355 SkyWest Airlines 5 2026-05-07
SKW3300 SkyWest Airlines 5 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3467 FCA → LAX Jul 26, 19:25 UTCJul 26, 20:30 UTC1h 5m
2026-07-26 SKW3450 SNA → SFO Jul 26, 17:00 UTCJul 26, 18:00 UTC1h 0m
2026-07-26 SKW3497 LAX → PDX Jul 26, 15:10 UTCJul 26, 16:05 UTC55m
2026-07-26 SKW3214 SJC → LAX Jul 26, 03:05 UTCJul 26, 05:40 UTC2h 35m
2026-07-26 SKW3124 SFO → LAX Jul 26, 01:05 UTCJul 26, 02:00 UTC55m
2026-07-25 SKW3126 LAX → SFO Jul 25, 23:15 UTCJul 26, 00:00 UTC45m
2026-07-25 SKW3138 YLW → SEA Jul 25, 21:05 UTCJul 25, 21:55 UTC50m
2026-07-25 SKW3254 FSD → ORD Jul 25, 18:50 UTCJul 25, 19:30 UTC40m
2026-07-25 SKW3254 FSD → ORD Jul 25, 18:55 UTCJul 25, 19:22 UTC27m
2026-07-25 SKW3361 SAN → SFO Jul 25, 14:20 UTCJul 25, 17:05 UTC2h 45m
2026-07-25 SKW3361 SAN → SFO Jul 25, 14:28 UTCJul 25, 17:04 UTC2h 36m
2026-07-25 SKW3225 SEA → YVR Jul 25, 00:55 UTCJul 25, 03:45 UTC2h 50m
2026-07-24 SKW3345 STS → SAN Jul 24, 22:25 UTCJul 24, 23:20 UTC55m
2026-07-24 SKWM3220 - Jul 24, 19:45 UTCJul 24, 20:50 UTC1h 5m
2026-07-24 SKWM3431 - Jul 24, 18:10 UTCJul 24, 18:45 UTC35m
2026-07-24 SKWM3201 GEG → PDX Jul 24, 15:55 UTCJul 24, 16:55 UTC1h 0m
2026-07-24 SKWM3198 BOI → GEG Jul 24, 13:55 UTCJul 24, 14:50 UTC55m
2026-07-24 SKW3413 SJC → BOI Jul 24, 03:40 UTCJul 24, 04:55 UTC1h 15m
2026-07-24 SKW3068 SAN → PHX Jul 24, 02:00 UTCJul 24, 03:00 UTC1h 0m
2026-07-24 SKW3068 SAN → PHX Jul 24, 01:55 UTCJul 24, 02:56 UTC1h 1m
2026-07-23 SKW3311 SJC → LAX Jul 23, 23:05 UTCJul 24, 00:25 UTC1h 20m
2026-07-23 SKW3218 CVG → ORD Jul 23, 19:59 UTCJul 23, 20:49 UTC50m
2026-07-23 SKW3218 CVG → ORD Jul 23, 19:50 UTCJul 23, 20:50 UTC1h 0m
2026-07-23 SKW3059 SJC → LAX Jul 23, 17:21 UTCJul 23, 18:32 UTC1h 11m
2026-07-23 SKW3059 SJC → LAX Jul 23, 17:25 UTCJul 23, 18:35 UTC1h 10m
2026-07-23 SKW864W SAN → SJC Jul 23, 15:17 UTCJul 23, 15:59 UTC42m
2026-07-23 SKW864W SAN → SJC Jul 23, 15:00 UTCJul 23, 16:00 UTC1h 0m
2026-07-23 SKW3293 LAX → SJC Jul 23, 11:30 UTCJul 23, 14:00 UTC2h 30m
2026-07-23 SKW3292 ORD → BNA Jul 23, 01:51 UTCJul 23, 04:13 UTC2h 22m
2026-07-23 SKW3292 ORD → BNA Jul 23, 01:40 UTCJul 23, 04:15 UTC2h 35m
2026-07-22 SKW3056 IDA → SEA Jul 22, 22:35 UTCJul 23, 00:45 UTC2h 10m
2026-07-22 SKW3038 DFW → ACT Jul 22, 19:30 UTCJul 22, 21:20 UTC1h 50m
2026-07-22 SKW3499 SJC → SAN Jul 22, 17:25 UTCJul 22, 18:35 UTC1h 10m
2026-07-22 SKW3131 - Jul 22, 14:35 UTCJul 22, 16:00 UTC1h 25m
2026-07-22 SKW3331 BOI → SAN Jul 22, 01:00 UTCJul 22, 02:40 UTC1h 40m
2026-07-21 SKW3311 SJC → LAX Jul 21, 22:20 UTCJul 21, 23:30 UTC1h 10m
2026-07-21 SKW3311 SJC → LAX Jul 21, 22:04 UTCJul 21, 23:29 UTC1h 25m
2026-07-21 SKW3218 SAN → OAK Jul 21, 20:13 UTCJul 21, 21:03 UTC50m
2026-07-21 SKW3218 - Jul 21, 20:00 UTCJul 21, 21:05 UTC1h 5m
2026-07-21 SKW3059 SJC → LAX Jul 21, 17:21 UTCJul 21, 19:04 UTC1h 43m
2026-07-21 SKW3059 SJC → LAX Jul 21, 17:55 UTCJul 21, 19:05 UTC1h 10m
2026-07-21 SKW864W SAN → SJC Jul 21, 14:55 UTCJul 21, 15:55 UTC1h 0m
2026-07-21 SKW3020 SNA → SFO Jul 21, 03:55 UTCJul 21, 06:05 UTC2h 10m
2026-07-21 SKW3012 - Jul 21, 00:00 UTCJul 21, 02:20 UTC2h 20m
2026-07-20 SKW3482 - Jul 20, 21:35 UTCJul 20, 22:55 UTC1h 20m
2026-07-20 SKW3486 BOI → SFO Jul 20, 19:15 UTCJul 20, 20:15 UTC1h 0m
2026-07-20 SKW3287 - Jul 20, 15:35 UTCJul 20, 16:50 UTC1h 15m
2026-07-20 SKW3432 - Jul 20, 02:30 UTCJul 20, 03:45 UTC1h 15m
2026-07-20 SKW3231 SNA → SFO Jul 20, 00:20 UTCJul 20, 01:35 UTC1h 15m
2026-07-19 SKW3483 PDX → SJC Jul 19, 22:05 UTCJul 19, 23:25 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 N194SY page for operator, model, and routing details .

Mode-S A178AE frequently asked

What is Mode-S code A178AE?
A178AE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N194SY.
Where is Mode-S A178AE registered?
Mode-S code A178AE 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 A178AE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A178AE, octal 50274256, decimal 10,582,190.
What flights does A178AE operate?
Mode-S A178AE has broadcast 20 distinct callsigns, including SKW3361, SKW3070, SKW3345, SKW3102, SKW3044.