Apparatus

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sensors Mode-S transponder

A4DD35

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N412SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A4DD35
Octal
51156465
Decimal
10,804,533
Country
US
Tail
N412SY
Type
E75L
No current signal · last broadcast Jul 26, 20:30 UTC
Flights observed
666
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

Last known position

Most recent position reported by Mode-S A4DD35.

Country allocation

The ICAO 24-bit address A4DD35 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
SKW3398 - 9 2026-06-28
SKW3052 SkyWest Airlines 9 2026-07-20
SKW3029 - 8 2026-07-15
SKW3313 SkyWest Airlines 7 2026-07-08
SKW3081 SkyWest Airlines 7 2026-06-15
SKW3050 - 7 2026-07-16
SKW3017 - 7 2026-07-18
SKW3480 - 6 2026-06-27
SKW3464 - 6 2026-07-11
SKW3330 SkyWest Airlines 6 2026-06-06
SKW3224 SkyWest Airlines 6 2026-07-26
SKW3223 SkyWest Airlines 6 2026-07-26
SKW3030 - 6 2026-07-16
SKW3015 - 6 2026-07-22
SKW3006 SkyWest Airlines 6 2026-07-22
SKW3482 - 5 2026-07-04
SKW3448 SkyWest Airlines 5 2026-06-12
SKW3440 SkyWest Airlines 5 2026-06-16
SKW3315 - 5 2026-06-30
SKW3300 SkyWest Airlines 5 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3223 RDM → BUR Jul 26, 18:35 UTCJul 26, 20:30 UTC1h 55m
2026-07-26 SKW3224 ORD → DTW Jul 26, 15:30 UTCJul 26, 17:00 UTC1h 30m
2026-07-26 SKW3260 EUG → BUR Jul 26, 02:45 UTCJul 26, 04:40 UTC1h 55m
2026-07-26 SKW3199 SAN → SMF Jul 26, 00:55 UTCJul 26, 01:45 UTC50m
2026-07-25 SKW3408 PDX → FAT Jul 25, 22:50 UTCJul 25, 23:25 UTC35m
2026-07-25 SKW3408 PDX → FAT Jul 25, 22:52 UTCJul 25, 23:13 UTC21m
2026-07-25 SKW3204 SEA → PDX Jul 25, 21:20 UTCJul 25, 21:50 UTC30m
2026-07-25 SKW3204 SEA → PDX Jul 25, 21:10 UTCJul 25, 21:49 UTC39m
2026-07-25 SKW3078 LAX → SFO Jul 25, 19:30 UTCJul 25, 20:00 UTC30m
2026-07-25 SKW3090 BIS → DFW Jul 25, 17:35 UTCJul 25, 18:05 UTC30m
2026-07-25 SKW3219 - Jul 25, 14:15 UTCJul 25, 15:15 UTC1h 0m
2026-07-25 SKW3219 FAT → SEA Jul 25, 14:18 UTCJul 25, 15:40 UTC1h 22m
2026-07-25 SKW3024 BNA → ORD Jul 25, 02:20 UTCJul 25, 03:45 UTC1h 25m
2026-07-25 SKW3098 STS → SNA Jul 25, 00:20 UTCJul 25, 01:25 UTC1h 5m
2026-07-24 SKW3097 MRY → PHX Jul 24, 21:55 UTCJul 24, 22:40 UTC45m
2026-07-24 SKW3117 SAN → SLC Jul 24, 19:25 UTCJul 24, 21:05 UTC1h 40m
2026-07-24 SKW3122 PHX → STS Jul 24, 16:20 UTCJul 24, 17:50 UTC1h 30m
2026-07-24 SKW3122 PHX → STS Jul 24, 16:20 UTCJul 24, 17:45 UTC1h 25m
2026-07-24 SKW3455 SJC → LAX Jul 24, 13:35 UTCJul 24, 14:50 UTC1h 15m
2026-07-24 SKW3067 LAX → SFO Jul 24, 06:30 UTCJul 24, 07:25 UTC55m
2026-07-24 SKW3067 LAX → SFO Jul 24, 06:24 UTCJul 24, 07:22 UTC58m
2026-07-24 SKW3072 SAN → SFO Jul 24, 03:15 UTCJul 24, 05:15 UTC2h 0m
2026-07-24 SKW3227 LAX → SFO Jul 24, 01:25 UTCJul 24, 02:25 UTC1h 0m
2026-07-23 SKW3269 SMF → LAX Jul 23, 23:15 UTCJul 24, 00:20 UTC1h 5m
2026-07-23 SKW3269 SMF → LAX Jul 23, 23:16 UTCJul 24, 00:09 UTC53m
2026-07-23 SKW3237 SFO → SNA Jul 23, 21:00 UTCJul 23, 22:10 UTC1h 10m
2026-07-23 SKW3205 SAN → SFO Jul 23, 17:50 UTCJul 23, 19:00 UTC1h 10m
2026-07-23 SKW3020 SNA → SFO Jul 23, 05:25 UTCJul 23, 07:20 UTC1h 55m
2026-07-23 SKW3012 STS → SAN Jul 23, 02:15 UTCJul 23, 04:15 UTC2h 0m
2026-07-22 SKW3028 SAN → LAS Jul 22, 20:55 UTCJul 22, 21:45 UTC50m
2026-07-22 SKW3023 SFO → SEA Jul 22, 19:00 UTCJul 22, 19:55 UTC55m
2026-07-22 SKW3015 SMF → SAN Jul 22, 16:00 UTCJul 22, 17:15 UTC1h 15m
2026-07-22 SKW3006 SEA → SFO Jul 22, 03:10 UTCJul 22, 04:20 UTC1h 10m
2026-07-22 SKW3019 SLC → ORD Jul 22, 00:25 UTCJul 22, 01:55 UTC1h 30m
2026-07-21 SKW3120 RNO → PDX Jul 21, 21:45 UTCJul 21, 23:30 UTC1h 45m
2026-07-21 SKW3120 RNO → PDX Jul 21, 21:46 UTCJul 21, 23:13 UTC1h 27m
2026-07-21 SKW3300 PSP → SEA Jul 21, 19:40 UTCJul 21, 20:15 UTC35m
2026-07-21 SKW3300 PSP → SEA Jul 21, 18:05 UTCJul 21, 18:50 UTC45m
2026-07-21 SKW3487 SAN → SMF Jul 21, 14:45 UTCJul 21, 16:05 UTC1h 20m
2026-07-21 SKW3024 BNA → ORD Jul 21, 02:10 UTCJul 21, 03:35 UTC1h 25m
2026-07-20 SKW3098 STS → SNA Jul 20, 23:55 UTCJul 21, 01:00 UTC1h 5m
2026-07-20 SKW3097 MRY → PHX Jul 20, 21:50 UTCJul 20, 22:40 UTC50m
2026-07-20 SKW3300 PSP → SEA Jul 20, 19:40 UTCJul 20, 20:15 UTC35m
2026-07-20 SKW3300 PSP → SEA Jul 20, 17:45 UTCJul 20, 18:35 UTC50m
2026-07-20 SKW3201 LAX → RNO Jul 20, 15:40 UTCJul 20, 16:40 UTC1h 0m
2026-07-20 SKW3198 SAN → SMF Jul 20, 13:55 UTCJul 20, 14:45 UTC50m
2026-07-20 SKW3215 GEG → BOI Jul 20, 02:46 UTCJul 20, 03:14 UTC28m
2026-07-20 SKW3215 - Jul 20, 02:30 UTCJul 20, 03:15 UTC45m
2026-07-20 SKW3052 SFO → LAX Jul 20, 00:40 UTCJul 20, 01:25 UTC45m
2026-07-19 SKW3421 SFO → LAX Jul 19, 22:30 UTCJul 19, 23:50 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 N412SY page for operator, model, and routing details .

Mode-S A4DD35 frequently asked

What is Mode-S code A4DD35?
A4DD35 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N412SY.
Where is Mode-S A4DD35 registered?
Mode-S code A4DD35 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 A4DD35 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 A4DD35, octal 51156465, decimal 10,804,533.
What flights does A4DD35 operate?
Mode-S A4DD35 has broadcast 20 distinct callsigns, including SKW3398, SKW3052, SKW3029, SKW3313, SKW3081.