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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 4h ago
Flights observed
593
Distinct callsigns
20
Country
US
Last broadcast
4h ago

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 8 2026-06-13
SKW3313 SkyWest Airlines 7 2026-07-08
SKW3081 SkyWest Airlines 7 2026-06-15
SKW3029 - 7 2026-07-13
SKW3480 - 6 2026-06-27
SKW3464 - 6 2026-07-11
SKW3330 SkyWest Airlines 6 2026-06-06
SKW3017 SkyWest Airlines 6 2026-05-20
SKW3482 - 5 2026-07-04
SKW3448 SkyWest Airlines 5 2026-06-12
SKW3440 SkyWest Airlines 5 2026-06-16
SKW3315 - 5 2026-06-30
SKW3224 - 5 2026-07-02
SKW3223 - 5 2026-07-02
SKW3221 - 5 2026-07-08
SKW3208 - 5 2026-07-12
SKW3066 SkyWest Airlines 5 2026-06-10
SKW3050 - 5 2026-07-13
SKW3030 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SKW3027 SEA → RDM Jul 15, 04:10 UTCJul 15, 04:50 UTC40m
2026-07-15 SKW3124 - Jul 15, 01:55 UTCJul 15, 02:40 UTC45m
2026-07-14 SKW3126 SEA → RDM Jul 14, 23:20 UTCJul 15, 00:10 UTC50m
2026-07-14 SKW3078 PDX → SEA Jul 14, 20:30 UTCJul 14, 21:00 UTC30m
2026-07-14 SKW3105 - Jul 14, 15:40 UTCJul 14, 16:25 UTC45m
2026-07-14 SKW3105 BLI → PDX Jul 14, 15:50 UTCJul 14, 16:20 UTC30m
2026-07-14 SKW849R SEA → BLI Jul 14, 06:30 UTCJul 14, 06:50 UTC20m
2026-07-14 SKW3044 - Jul 14, 02:55 UTCJul 14, 04:20 UTC1h 25m
2026-07-14 SKW3044 STS → SEA Jul 14, 02:41 UTCJul 14, 04:04 UTC1h 23m
2026-07-14 SKW3476 - Jul 14, 00:25 UTCJul 14, 01:25 UTC1h 0m
2026-07-13 SKW3349 GEG → LAX Jul 13, 19:00 UTCJul 13, 21:45 UTC2h 45m
2026-07-13 SKW3351 - Jul 13, 15:55 UTCJul 13, 17:55 UTC2h 0m
2026-07-13 SKW3050 - Jul 13, 13:15 UTCJul 13, 14:35 UTC1h 20m
2026-07-13 SKW3050 STS → LAX Jul 13, 13:18 UTCJul 13, 14:28 UTC1h 10m
2026-07-13 SKW3115 PDX → STS Jul 13, 06:24 UTCJul 13, 07:20 UTC56m
2026-07-13 SKW3115 - Jul 13, 06:01 UTCJul 13, 07:20 UTC1h 20m
2026-07-13 SKW3030 SJC → PDX Jul 13, 03:50 UTCJul 13, 05:10 UTC1h 20m
2026-07-13 SKW3029 - Jul 13, 02:10 UTCJul 13, 03:10 UTC1h 0m
2026-07-12 SKW3337 SFO → SAN Jul 12, 23:50 UTCJul 13, 01:05 UTC1h 15m
2026-07-12 SKW3208 - Jul 12, 20:45 UTCJul 12, 22:45 UTC2h 0m
2026-07-12 SKW3468 - Jul 12, 17:25 UTCJul 12, 21:15 UTC3h 50m
2026-07-12 SKW3468 SFO → JAC Jul 12, 17:35 UTCJul 12, 19:10 UTC1h 35m
2026-07-12 SKW3251 - Jul 12, 15:15 UTCJul 12, 16:15 UTC1h 0m
2026-07-11 SKW3494 - Jul 11, 23:00 UTCJul 12, 00:15 UTC1h 15m
2026-07-11 SKW3208 - Jul 11, 19:35 UTCJul 11, 21:30 UTC1h 55m
2026-07-11 SKW3468 - Jul 11, 16:30 UTCJul 11, 17:50 UTC1h 20m
2026-07-11 SKW3251 - Jul 11, 14:35 UTCJul 11, 15:35 UTC1h 0m
2026-07-11 SKW3464 - Jul 11, 04:10 UTCJul 11, 05:20 UTC1h 10m
2026-07-11 SKW3464 SFO → SNA Jul 11, 04:17 UTCJul 11, 05:09 UTC52m
2026-07-11 SKW3232 SAN → SFO Jul 11, 02:09 UTCJul 11, 03:00 UTC51m
2026-07-10 SKW812T - Jul 10, 23:50 UTCJul 11, 00:40 UTC50m
2026-07-10 SKW3389 SAN → SJC Jul 10, 21:40 UTCJul 10, 22:25 UTC45m
2026-07-10 SKW3479 - Jul 10, 19:35 UTCJul 10, 20:50 UTC1h 15m
2026-07-10 SKW3342 - Jul 10, 16:55 UTCJul 10, 17:55 UTC1h 0m
2026-07-10 SKW3244 - Jul 10, 13:50 UTCJul 10, 15:00 UTC1h 10m
2026-07-10 SKW3067 - Jul 10, 06:10 UTCJul 10, 07:05 UTC55m
2026-07-10 SKW3072 - Jul 10, 03:25 UTCJul 10, 05:15 UTC1h 50m
2026-07-10 SKW3072 RDM → LAX Jul 10, 03:34 UTCJul 10, 05:11 UTC1h 37m
2026-07-10 SKW3091 - Jul 10, 01:25 UTCJul 10, 02:30 UTC1h 5m
2026-07-09 SKW3269 SMF → LAX Jul 9, 22:50 UTCJul 9, 23:55 UTC1h 5m
2026-07-09 SKW3237 - Jul 9, 20:50 UTCJul 9, 21:55 UTC1h 5m
2026-07-09 SKW3205 SAN → SFO Jul 9, 18:40 UTCJul 9, 19:50 UTC1h 10m
2026-07-09 SKW3205 SAN → SFO Jul 9, 18:20 UTCJul 9, 19:43 UTC1h 23m
2026-07-09 SKW3235 BOI → SAN Jul 9, 14:05 UTCJul 9, 16:15 UTC2h 10m
2026-07-09 SKW3413 - Jul 9, 02:55 UTCJul 9, 04:10 UTC1h 15m
2026-07-09 SKW3068 SAN → SJC Jul 9, 01:02 UTCJul 9, 01:45 UTC43m
2026-07-09 SKW3068 - Jul 9, 00:45 UTCJul 9, 01:45 UTC1h 0m
2026-07-08 SKW3221 - Jul 8, 22:30 UTCJul 8, 23:30 UTC1h 0m
2026-07-08 SKW3346 LAX → SFO Jul 8, 20:20 UTCJul 8, 21:10 UTC50m
2026-07-08 SKW3313 RDM → SFO Jul 8, 18:05 UTCJul 8, 19:15 UTC1h 10m

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 4h ago.
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, SKW3313, SKW3081, SKW3029.