Apparatus

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sensors Mode-S transponder

A129B0

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N174SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A129B0
Octal
50224660
Decimal
10,561,968
Country
US
Tail
N174SY
Type
E75L
No current signal · last broadcast Jul 26, 16:35 UTC
Flights observed
702
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 16:35 UTC

Last known position

Most recent position reported by Mode-S A129B0.

Country allocation

The ICAO 24-bit address A129B0 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
SKW3433 - 10 2026-06-27
SKW3019 SkyWest Airlines 8 2026-07-25
SKW3017 - 8 2026-07-14
SKW918J - 7 2026-07-13
SKW833K SkyWest Airlines 7 2026-07-25
SKW3499 - 7 2026-07-06
SKW3450 SkyWest Airlines 7 2026-06-08
SKW3394 SkyWest Airlines 7 2026-05-17
SKW3292 - 7 2026-07-05
SKW3062 - 7 2026-07-14
SKW3055 SkyWest Airlines 7 2026-07-24
SKW3015 SkyWest Airlines 7 2026-07-25
SKW3488 SkyWest Airlines 6 2026-07-25
SKW3465 SkyWest Airlines 6 2026-06-08
SKW3431 SkyWest Airlines 6 2026-07-20
SKW3429 - 6 2026-07-13
SKW3413 - 6 2026-07-19
SKW3375 - 6 2026-06-20
SKW3368 SkyWest Airlines 6 2026-04-14
SKW3300 SkyWest Airlines 6 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3105 LAX → SFO Jul 26, 15:45 UTCJul 26, 16:35 UTC50m
2026-07-26 SKW3106 SAN → SJC Jul 26, 04:40 UTCJul 26, 05:25 UTC45m
2026-07-26 SKW3280 PSP → SFO Jul 26, 01:55 UTCJul 26, 03:30 UTC1h 35m
2026-07-25 SKW3488 SJC → PDX Jul 25, 23:05 UTCJul 26, 00:35 UTC1h 30m
2026-07-25 SKW3439 STS → SAN Jul 25, 20:40 UTCJul 25, 21:55 UTC1h 15m
2026-07-25 SKW833K SAN → SMF Jul 25, 18:20 UTCJul 25, 19:30 UTC1h 10m
2026-07-25 SKW3015 SJC → LAX Jul 25, 15:45 UTCJul 25, 17:05 UTC1h 20m
2026-07-25 SKW3006 SEA → SFO Jul 25, 03:15 UTCJul 25, 04:25 UTC1h 10m
2026-07-25 SKW3019 SLC → ORD Jul 25, 00:25 UTCJul 25, 02:05 UTC1h 40m
2026-07-24 SKW3120 RNO → PDX Jul 24, 21:55 UTCJul 24, 23:25 UTC1h 30m
2026-07-24 SKW3045 ORD → HPN Jul 24, 19:27 UTCJul 24, 20:24 UTC57m
2026-07-24 SKW3045 ORD → HPN Jul 24, 19:20 UTCJul 24, 20:35 UTC1h 15m
2026-07-24 SKW3055 LAX → LAS Jul 24, 17:00 UTCJul 24, 18:30 UTC1h 30m
2026-07-24 SKW3417 LAX → SFO Jul 24, 14:15 UTCJul 24, 15:20 UTC1h 5m
2026-07-24 SKW3410 PSP → SFO Jul 24, 04:20 UTCJul 24, 05:55 UTC1h 35m
2026-07-23 SKW3498 SAN → FCA Jul 23, 23:35 UTCJul 24, 03:15 UTC3h 40m
2026-07-23 SKW3489 MRY → SAN Jul 23, 18:30 UTCJul 23, 22:25 UTC3h 55m
2026-07-23 SKW3132 BOI → SFO Jul 23, 16:20 UTCJul 23, 16:55 UTC35m
2026-07-23 SKW3026 SEA → IDA Jul 23, 13:15 UTCJul 23, 14:00 UTC45m
2026-07-23 SKW3026 SEA → IDA Jul 23, 13:21 UTCJul 23, 13:59 UTC38m
2026-07-23 SKW3027 SEA → FAT Jul 23, 03:00 UTCJul 23, 03:45 UTC45m
2026-07-23 SKW3094 SJC → SEA Jul 23, 00:50 UTCJul 23, 01:35 UTC45m
2026-07-22 SKW3046 SEA → PDX Jul 22, 23:00 UTCJul 22, 23:45 UTC45m
2026-07-22 SKW3489 MRY → SAN Jul 22, 17:35 UTCJul 22, 21:30 UTC3h 55m
2026-07-22 SKW3370 - Jul 22, 14:30 UTCJul 22, 16:30 UTC2h 0m
2026-07-22 SKW3214 SJC → LAX Jul 22, 03:25 UTCJul 22, 05:25 UTC2h 0m
2026-07-22 SKW3372 PDX → SJC Jul 22, 00:40 UTCJul 22, 01:05 UTC25m
2026-07-21 SKW3118 RNO → SEA Jul 21, 23:10 UTCJul 21, 23:35 UTC25m
2026-07-21 SKW3118 RNO → SEA Jul 21, 23:06 UTCJul 21, 23:34 UTC28m
2026-07-21 SKW3087 SNA → SFO Jul 21, 20:45 UTCJul 21, 21:40 UTC55m
2026-07-21 SKW3088 SFO → SNA Jul 21, 18:40 UTCJul 21, 19:50 UTC1h 10m
2026-07-21 SKW3361 TUS → SEA Jul 21, 14:15 UTCJul 21, 17:00 UTC2h 45m
2026-07-21 SKW3225 SEA → YVR Jul 21, 01:10 UTCJul 21, 04:00 UTC2h 50m
2026-07-20 SKW3345 - Jul 20, 22:25 UTCJul 20, 23:20 UTC55m
2026-07-20 SKW3345 ACV → SEA Jul 20, 22:18 UTCJul 20, 23:15 UTC57m
2026-07-20 SKW3220 LAX → EUG Jul 20, 19:50 UTCJul 20, 20:55 UTC1h 5m
2026-07-20 SKW3431 SJC → PSP Jul 20, 17:50 UTCJul 20, 18:20 UTC30m
2026-07-20 SKW3431 SJC → PSP Jul 20, 17:51 UTCJul 20, 18:17 UTC26m
2026-07-20 SKW3105 LAX → SFO Jul 20, 15:50 UTCJul 20, 16:35 UTC45m
2026-07-20 SKW3106 SAN → SJC Jul 20, 04:40 UTCJul 20, 05:20 UTC40m
2026-07-20 SKW3285 LAX → SEA Jul 20, 01:10 UTCJul 20, 02:30 UTC1h 20m
2026-07-19 SKW3285 LAX → SEA Jul 19, 22:10 UTCJul 19, 23:40 UTC1h 30m
2026-07-19 SKW3074 LAX → SFO Jul 19, 19:45 UTCJul 19, 20:15 UTC30m
2026-07-19 SKW3073 - Jul 19, 18:05 UTCJul 19, 18:35 UTC30m
2026-07-19 SKW3073 PDX → RDM Jul 19, 18:01 UTCJul 19, 18:33 UTC32m
2026-07-19 SKW3201 LAX → RNO Jul 19, 15:55 UTCJul 19, 16:45 UTC50m
2026-07-19 SKW3198 SAN → SMF Jul 19, 13:50 UTCJul 19, 14:35 UTC45m
2026-07-19 SKW3413 - Jul 19, 02:45 UTCJul 19, 04:05 UTC1h 20m
2026-07-19 SKW3068 SAN → PHX Jul 19, 00:45 UTCJul 19, 01:45 UTC1h 0m
2026-07-18 SKW3123 LTO → DFW Jul 18, 21:55 UTCJul 18, 23:30 UTC1h 35m

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 N174SY page for operator, model, and routing details .

Mode-S A129B0 frequently asked

What is Mode-S code A129B0?
A129B0 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N174SY.
Where is Mode-S A129B0 registered?
Mode-S code A129B0 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 A129B0 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A129B0, octal 50224660, decimal 10,561,968.
What flights does A129B0 operate?
Mode-S A129B0 has broadcast 20 distinct callsigns, including SKW3433, SKW3019, SKW3017, SKW918J, SKW833K.