Apparatus

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sensors Mode-S transponder

A134D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N177SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A134D5
Octal
50232325
Decimal
10,564,821
Country
US
Tail
N177SY
Type
E75L
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
654
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S A134D5.

Country allocation

The ICAO 24-bit address A134D5 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
SKW3044 SkyWest Airlines 10 2026-07-20
SKW3443 SkyWest Airlines 9 2026-06-09
SKW3497 - 7 2026-07-08
SKW3287 - 7 2026-06-18
SKW3248 SkyWest Airlines 7 2026-07-08
SKW3076 - 7 2026-06-27
SKW3494 SkyWest Airlines 6 2026-07-07
SKW3425 SkyWest Airlines 6 2026-06-09
SKW3404 - 6 2026-07-19
SKW3394 SkyWest Airlines 6 2026-06-10
SKW3322 - 6 2026-06-27
SKW3077 - 6 2026-07-06
SKW3050 - 6 2026-07-05
SKW3025 SkyWest Airlines 6 2026-07-06
SKW3464 - 5 2026-07-07
SKW3434 SkyWest Airlines 5 2026-05-16
SKW3417 - 5 2026-06-15
SKW3363 SkyWest Airlines 5 2026-07-20
SKW3362 SkyWest Airlines 5 2026-07-20
SKW3122 SkyWest Airlines 5 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3074 LAX → SFO Jul 26, 19:35 UTCJul 26, 20:05 UTC30m
2026-07-26 SKW3073 SAN → EUG Jul 26, 18:10 UTCJul 26, 18:40 UTC30m
2026-07-26 SKW3004 SJC → PHX Jul 26, 15:05 UTCJul 26, 16:45 UTC1h 40m
2026-07-26 SKW3004 SJC → PHX Jul 26, 14:41 UTCJul 26, 16:40 UTC1h 59m
2026-07-26 SKW3291 DFW → ASE Jul 26, 05:40 UTCJul 26, 07:10 UTC1h 31m
2026-07-26 SKW9791 SEA → SFO Jul 26, 04:15 UTCJul 26, 04:45 UTC30m
2026-07-25 SKW3048 PDX → SEA Jul 25, 04:05 UTCJul 25, 04:55 UTC50m
2026-07-25 SKW3107 SJC → SAN Jul 25, 01:40 UTCJul 25, 03:15 UTC1h 35m
2026-07-24 SKW3092 SAN → SJC Jul 24, 23:50 UTCJul 25, 00:50 UTC1h 0m
2026-07-24 SKW9791 SEA → SFO Jul 24, 21:20 UTCJul 24, 22:40 UTC1h 20m
2026-07-23 SKW9799 BOI → SFO Jul 23, 22:10 UTCJul 23, 23:15 UTC1h 5m
2026-07-23 SKW9799 BOI → SFO Jul 23, 21:51 UTCJul 23, 23:15 UTC1h 24m
2026-07-23 SKW3448 - Jul 23, 16:10 UTCJul 23, 16:35 UTC25m
2026-07-23 SKW9339 SLC → SFO Jul 23, 14:20 UTCJul 23, 14:45 UTC25m
2026-07-23 SKW3124 SFO → LAX Jul 23, 05:25 UTCJul 23, 06:15 UTC50m
2026-07-23 SKW3126 LAX → SFO Jul 23, 04:05 UTCJul 23, 04:30 UTC25m
2026-07-22 SKW3126 LAX → SFO Jul 22, 23:20 UTCJul 23, 00:50 UTC1h 30m
2026-07-22 SKW3078 LAX → SFO Jul 22, 19:25 UTCJul 22, 19:50 UTC25m
2026-07-22 SKW3090 BIS → DFW Jul 22, 17:35 UTCJul 22, 18:05 UTC30m
2026-07-22 SKW3054 YVR → SEA Jul 22, 13:50 UTCJul 22, 14:45 UTC55m
2026-07-22 SKW3423 SFO → LAX Jul 22, 03:35 UTCJul 22, 04:45 UTC1h 10m
2026-07-22 SKW3124 SFO → LAX Jul 22, 02:00 UTCJul 22, 02:40 UTC40m
2026-07-22 SKW3126 LAX → SFO Jul 22, 00:30 UTCJul 22, 01:10 UTC40m
2026-07-21 SKW3408 PDX → FAT Jul 21, 22:50 UTCJul 21, 23:15 UTC25m
2026-07-21 SKW3204 SEA → PDX Jul 21, 21:20 UTCJul 21, 21:55 UTC35m
2026-07-21 SKW3078 LAX → SFO Jul 21, 19:25 UTCJul 21, 19:50 UTC25m
2026-07-21 SKW3090 BIS → DFW Jul 21, 17:50 UTCJul 21, 18:25 UTC35m
2026-07-21 SKW3219 - Jul 21, 14:15 UTCJul 21, 15:50 UTC1h 35m
2026-07-21 SKW3343 SJC → SAN Jul 21, 03:45 UTCJul 21, 05:25 UTC1h 40m
2026-07-21 SKW3082 ACT → DFW Jul 21, 00:20 UTCJul 21, 01:55 UTC1h 35m
2026-07-20 SKW3083 PDX → STS Jul 20, 21:55 UTCJul 20, 23:05 UTC1h 10m
2026-07-20 SKW3083 PDX → STS Jul 20, 21:41 UTCJul 20, 23:08 UTC1h 27m
2026-07-20 SKW3363 SFO → LAX Jul 20, 18:10 UTCJul 20, 19:35 UTC1h 25m
2026-07-20 SKW3362 SEA → SFO Jul 20, 15:40 UTCJul 20, 16:30 UTC50m
2026-07-20 SKW3448 - Jul 20, 13:25 UTCJul 20, 13:50 UTC25m
2026-07-20 SKW849R SEA → BLI Jul 20, 07:00 UTCJul 20, 07:15 UTC15m
2026-07-20 SKW849R SEA → BLI Jul 20, 06:57 UTCJul 20, 07:15 UTC18m
2026-07-20 SKW3044 PDX → SMF Jul 20, 04:15 UTCJul 20, 05:35 UTC1h 20m
2026-07-20 SKW3476 RDM → SFO Jul 20, 02:15 UTCJul 20, 03:15 UTC1h 0m
2026-07-19 SKW3404 - Jul 19, 23:10 UTCJul 20, 00:35 UTC1h 25m
2026-07-19 SKW3404 - Jul 19, 17:45 UTCJul 19, 19:05 UTC1h 20m
2026-07-19 SKW3404 LAX → ZLO Jul 19, 17:53 UTCJul 19, 20:45 UTC2h 52m
2026-07-19 SKW3304 SEA → SFO Jul 19, 14:10 UTCJul 19, 16:15 UTC2h 5m
2026-07-19 SKW3303 - Jul 19, 02:55 UTCJul 19, 03:55 UTC1h 0m
2026-07-18 SKW3404 - Jul 18, 18:25 UTCJul 19, 00:50 UTC6h 25m
2026-07-18 SKW3304 SEA → SFO Jul 18, 14:10 UTCJul 18, 16:20 UTC2h 10m
2026-07-18 SKW3066 LAS → SAN Jul 18, 05:25 UTCJul 18, 05:50 UTC25m
2026-07-18 SKW3285 LAX → SEA Jul 18, 02:19 UTCJul 18, 03:35 UTC1h 16m
2026-07-17 SKW3285 LAX → SEA Jul 17, 22:45 UTCJul 18, 00:25 UTC1h 40m
2026-07-17 SKW3204 SEA → PDX Jul 17, 21:20 UTCJul 17, 21:50 UTC30m

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 N177SY page for operator, model, and routing details .

Mode-S A134D5 frequently asked

What is Mode-S code A134D5?
A134D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N177SY.
Where is Mode-S A134D5 registered?
Mode-S code A134D5 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 A134D5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A134D5, octal 50232325, decimal 10,564,821.
What flights does A134D5 operate?
Mode-S A134D5 has broadcast 20 distinct callsigns, including SKW3044, SKW3443, SKW3497, SKW3287, SKW3248.