Apparatus

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sensors Mode-S transponder

A4CFB7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N409SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A4CFB7
Octal
51147667
Decimal
10,801,079
Country
US
Tail
N409SY
Type
E75L
Broadcasting now · callsign SKW3039 · 25,050 ft
Flights observed
704
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Current position

A4CFB7 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4CFB7 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
SKW3337 SkyWest Airlines 11 2026-05-08
SKW3294 SkyWest Airlines 11 2026-06-21
SKW3311 SkyWest Airlines 10 2026-07-22
SKW3033 SkyWest Airlines 10 2026-05-21
SKW3470 SkyWest Airlines 8 2026-05-20
SKW3345 SkyWest Airlines 8 2026-05-25
SKW3218 SkyWest Airlines 8 2026-07-22
SKW3131 - 8 2026-07-21
SKW3070 SkyWest Airlines 8 2026-07-20
SKW3027 - 8 2026-06-28
SKW3499 - 7 2026-07-21
SKW3300 SkyWest Airlines 7 2026-07-23
SKW3299 SkyWest Airlines 7 2026-05-08
SKW3433 SkyWest Airlines 6 2026-05-07
SKW3413 - 6 2026-07-16
SKW3393 SkyWest Airlines 6 2026-07-25
SKW3343 SkyWest Airlines 6 2026-05-25
SKW3320 SkyWest Airlines 6 2026-06-24
SKW3292 SkyWest Airlines 6 2026-07-22
SKW3221 - 6 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3389 SAN → SJC Jul 26, 21:30 UTCJul 26, 21:45 UTC15m
2026-07-26 SKW3479 SJC → BOI Jul 26, 19:10 UTCJul 26, 20:25 UTC1h 15m
2026-07-26 SKW3342 LAX → SFO Jul 26, 16:35 UTCJul 26, 17:40 UTC1h 5m
2026-07-26 SKW3244 SFO → SNA Jul 26, 14:10 UTCJul 26, 15:20 UTC1h 10m
2026-07-26 SKW3067 LAX → SFO Jul 26, 05:45 UTCJul 26, 06:35 UTC51m
2026-07-26 SKW3072 SAN → SFO Jul 26, 02:45 UTCJul 26, 04:35 UTC1h 50m
2026-07-26 SKW3072 SAN → SFO Jul 26, 02:41 UTCJul 26, 04:30 UTC1h 49m
2026-07-26 SKW3227 LAX → SFO Jul 26, 00:35 UTCJul 26, 01:35 UTC1h 0m
2026-07-25 SKW3269 SMF → LAX Jul 25, 22:25 UTCJul 25, 23:30 UTC1h 5m
2026-07-25 SKW3237 SFO → SNA Jul 25, 20:15 UTCJul 25, 21:25 UTC1h 10m
2026-07-25 SKW3025 DEN → SAN Jul 25, 17:30 UTCJul 25, 19:00 UTC1h 30m
2026-07-25 SKW3393 LAX → SFO Jul 25, 15:00 UTCJul 25, 16:30 UTC1h 30m
2026-07-25 SKW3037 BNA → ORD Jul 25, 05:10 UTCJul 25, 06:10 UTC1h 0m
2026-07-25 SKW3037 BNA → ORD Jul 25, 05:04 UTCJul 25, 06:04 UTC1h 0m
2026-07-25 SKW3226 HPN → ORD Jul 25, 02:15 UTCJul 25, 03:55 UTC1h 40m
2026-07-24 SKW3071 DTW → ORD Jul 24, 23:05 UTCJul 25, 00:35 UTC1h 30m
2026-07-24 SKW3349 PSP → SFO Jul 24, 19:13 UTCJul 24, 21:19 UTC2h 6m
2026-07-24 SKW3349 PSP → SFO Jul 24, 19:05 UTCJul 24, 21:20 UTC2h 15m
2026-07-24 SKW3351 SAN → SJC Jul 24, 15:50 UTCJul 24, 17:50 UTC2h 0m
2026-07-24 SKW3050 SEA → EUG Jul 24, 13:15 UTCJul 24, 14:20 UTC1h 5m
2026-07-24 SKW3432 SAN → SFO Jul 24, 02:25 UTCJul 24, 03:35 UTC1h 10m
2026-07-24 SKW3231 SNA → SFO Jul 24, 00:05 UTCJul 24, 01:20 UTC1h 15m
2026-07-23 SKW3483 PDX → SJC Jul 23, 21:45 UTCJul 23, 23:05 UTC1h 20m
2026-07-23 SKW3300 PSP → SEA Jul 23, 19:50 UTCJul 23, 20:30 UTC40m
2026-07-23 SKW3300 PSP → SEA Jul 23, 18:05 UTCJul 23, 18:55 UTC50m
2026-07-23 SKW3201 LAX → RNO Jul 23, 15:55 UTCJul 23, 16:50 UTC55m
2026-07-23 SKW3198 SAN → SMF Jul 23, 13:55 UTCJul 23, 14:45 UTC50m
2026-07-23 SKW3198 SAN → SMF Jul 23, 14:00 UTCJul 23, 14:41 UTC41m
2026-07-23 SKW3331 BOI → SAN Jul 23, 02:15 UTCJul 23, 04:00 UTC1h 45m
2026-07-23 SKW3331 BOI → SAN Jul 23, 02:02 UTCJul 23, 03:58 UTC1h 56m
2026-07-22 SKW3311 SJC → LAX Jul 22, 23:35 UTCJul 23, 00:55 UTC1h 20m
2026-07-22 SKW3311 SJC → LAX Jul 22, 23:17 UTCJul 23, 00:49 UTC1h 32m
2026-07-22 SKW3218 CVG → ORD Jul 22, 21:15 UTCJul 22, 22:20 UTC1h 5m
2026-07-22 SKW3059 SJC → LAX Jul 22, 17:40 UTCJul 22, 18:50 UTC1h 10m
2026-07-22 SKW864W SAN → SJC Jul 22, 15:15 UTCJul 22, 16:15 UTC1h 0m
2026-07-22 SKW3293 AUS → SAN Jul 22, 11:25 UTCJul 22, 13:45 UTC2h 20m
2026-07-22 SKW3292 ORD → BNA Jul 22, 01:10 UTCJul 22, 03:55 UTC2h 45m
2026-07-21 SKW3429 SAN → SJC Jul 21, 22:30 UTCJul 21, 23:45 UTC1h 15m
2026-07-21 SKW918J - Jul 21, 20:25 UTCJul 21, 21:25 UTC1h 0m
2026-07-21 SKW918J SAN → SJC Jul 21, 20:24 UTCJul 21, 21:21 UTC57m
2026-07-21 SKW3499 SJC → SAN Jul 21, 17:00 UTCJul 21, 18:05 UTC1h 5m
2026-07-21 SKW3131 - Jul 21, 13:45 UTCJul 21, 15:10 UTC1h 25m
2026-07-21 SKW3375 SJC → PDX Jul 21, 02:40 UTCJul 21, 03:50 UTC1h 10m
2026-07-20 SKW3070 SEA → PSC Jul 20, 23:50 UTCJul 21, 01:45 UTC1h 55m
2026-07-20 SKW3262 BFL → PHX Jul 20, 21:40 UTCJul 20, 22:25 UTC45m
2026-07-20 SKW3009 LRD → DFW Jul 20, 19:20 UTCJul 20, 20:25 UTC1h 5m
2026-07-20 SKW3400 PDX → SFO Jul 20, 16:55 UTCJul 20, 18:00 UTC1h 5m
2026-07-20 SKW3213 RDM → PHX Jul 20, 14:35 UTCJul 20, 15:35 UTC1h 0m
2026-07-20 SKW3302 - Jul 20, 04:35 UTCJul 20, 05:40 UTC1h 5m
2026-07-20 SKW3060 PHX → SAN Jul 20, 02:15 UTCJul 20, 03:10 UTC55m

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 N409SY page for operator, model, and routing details .

Mode-S A4CFB7 frequently asked

What is Mode-S code A4CFB7?
A4CFB7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N409SY.
Where is Mode-S A4CFB7 registered?
Mode-S code A4CFB7 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 A4CFB7 broadcasting right now?
Yes. Mode-S A4CFB7 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CFB7, octal 51147667, decimal 10,801,079.
What flights does A4CFB7 operate?
Mode-S A4CFB7 has broadcast 20 distinct callsigns, including SKW3337, SKW3294, SKW3311, SKW3033, SKW3470.