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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 SKW3131 · 28,175 ft
Flights observed
620
Distinct callsigns
20
Country
US
Last broadcast
9h ago

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
SKW3033 SkyWest Airlines 10 2026-05-21
SKW3470 SkyWest Airlines 8 2026-05-20
SKW3345 SkyWest Airlines 8 2026-05-25
SKW3027 - 8 2026-06-28
SKW3311 - 7 2026-07-11
SKW3299 SkyWest Airlines 7 2026-05-08
SKW3070 - 7 2026-07-08
SKW3433 SkyWest Airlines 6 2026-05-07
SKW3343 SkyWest Airlines 6 2026-05-25
SKW3320 SkyWest Airlines 6 2026-06-24
SKW3221 - 6 2026-06-24
SKW3218 - 6 2026-07-11
SKW3131 - 6 2026-07-13
SKW3086 - 6 2026-07-08
SKW3055 - 6 2026-06-29
SKW3413 - 5 2026-07-14
SKW3411 SkyWest Airlines 5 2026-05-19
SKW3393 SkyWest Airlines 5 2026-05-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW3413 - Jul 14, 03:50 UTCJul 14, 05:05 UTC1h 15m
2026-07-14 SKW3068 - Jul 14, 01:55 UTCJul 14, 02:50 UTC55m
2026-07-13 SKW3056 EUG → SAN Jul 13, 22:30 UTCJul 14, 00:50 UTC2h 20m
2026-07-13 SKW3038 SAN → EUG Jul 13, 19:23 UTCJul 13, 20:49 UTC1h 26m
2026-07-13 SKW3038 - Jul 13, 19:10 UTCJul 13, 20:50 UTC1h 40m
2026-07-13 SKW3499 - Jul 13, 16:25 UTCJul 13, 18:15 UTC1h 50m
2026-07-13 SKW3131 BOI → SJC Jul 13, 13:55 UTCJul 13, 15:35 UTC1h 40m
2026-07-13 SKW3096 PHX → BOI Jul 13, 00:17 UTCJul 13, 02:24 UTC2h 7m
2026-07-13 SKW3096 - Jul 13, 00:50 UTCJul 13, 01:45 UTC55m
2026-07-12 SKW3095 - Jul 12, 21:05 UTCJul 12, 22:55 UTC1h 50m
2026-07-12 SKW3209 FAT → SEA Jul 12, 18:20 UTCJul 12, 19:40 UTC1h 20m
2026-07-12 SKW3116 - Jul 12, 15:20 UTCJul 12, 17:15 UTC1h 55m
2026-07-12 SKW3331 SAN → BOI Jul 12, 00:35 UTCJul 12, 02:00 UTC1h 25m
2026-07-12 SKW3331 - Jul 12, 00:25 UTCJul 12, 02:01 UTC1h 35m
2026-07-11 SKW3311 OAK → SAN Jul 11, 22:10 UTCJul 11, 23:30 UTC1h 20m
2026-07-11 SKW3218 SAN → OAK Jul 11, 19:55 UTCJul 11, 20:40 UTC45m
2026-07-11 SKW3218 - Jul 11, 19:40 UTCJul 11, 20:40 UTC1h 0m
2026-07-11 SKW3059 SJC → SAN Jul 11, 17:15 UTCJul 11, 18:25 UTC1h 10m
2026-07-11 SKW864W SAN → SJC Jul 11, 15:13 UTCJul 11, 15:51 UTC38m
2026-07-11 SKW864W SAN → SJC Jul 11, 14:55 UTCJul 11, 15:55 UTC1h 0m
2026-07-11 SKW3293 AUS → SAN Jul 11, 11:30 UTCJul 11, 13:55 UTC2h 25m
2026-07-11 SKW3292 - Jul 11, 01:25 UTCJul 11, 03:55 UTC2h 30m
2026-07-10 SKW3056 EUG → SAN Jul 10, 21:45 UTCJul 11, 00:05 UTC2h 20m
2026-07-10 SKW3038 - Jul 10, 19:05 UTCJul 10, 20:50 UTC1h 45m
2026-07-10 SKW3499 SJC → SAN Jul 10, 16:25 UTCJul 10, 17:35 UTC1h 10m
2026-07-10 SKW3131 - Jul 10, 13:50 UTCJul 10, 15:20 UTC1h 30m
2026-07-10 SKW3096 - Jul 10, 00:15 UTCJul 10, 01:55 UTC1h 40m
2026-07-09 SKW3095 - Jul 9, 21:25 UTCJul 9, 23:10 UTC1h 45m
2026-07-09 SKW3095 BOI → PHX Jul 9, 21:40 UTCJul 9, 23:10 UTC1h 30m
2026-07-09 SKW3209 FAT → SEA Jul 9, 18:05 UTCJul 9, 19:40 UTC1h 35m
2026-07-09 SKW3116 - Jul 9, 15:20 UTCJul 9, 17:05 UTC1h 45m
2026-07-09 SKW3375 - Jul 9, 02:35 UTCJul 9, 03:45 UTC1h 10m
2026-07-08 SKW3070 GEG → SFO Jul 8, 23:40 UTCJul 9, 01:30 UTC1h 50m
2026-07-08 SKW3262 BFL → PHX Jul 8, 21:40 UTCJul 8, 22:25 UTC45m
2026-07-08 SKW3009 LRD → DFW Jul 8, 19:25 UTCJul 8, 20:45 UTC1h 20m
2026-07-08 SKW3400 - Jul 8, 16:55 UTCJul 8, 18:00 UTC1h 5m
2026-07-08 SKW3213 RDM → PHX Jul 8, 14:45 UTCJul 8, 15:40 UTC55m
2026-07-08 SKW3086 - Jul 8, 01:50 UTCJul 8, 02:55 UTC1h 5m
2026-07-08 SKW3086 - Jul 8, 00:00 UTCJul 8, 01:10 UTC1h 10m
2026-07-07 SKW3076 - Jul 7, 22:00 UTCJul 7, 23:05 UTC1h 5m
2026-07-07 SKW9790 - Jul 7, 20:35 UTCJul 7, 21:00 UTC25m
2026-07-05 SKW3217 EUG → SAN Jul 5, 14:55 UTCJul 5, 17:15 UTC2h 20m
2026-07-04 SKW3107 BUR → EUG Jul 4, 23:35 UTCJul 5, 01:20 UTC1h 45m
2026-07-04 SKW3092 SAN → SJC Jul 4, 21:30 UTCJul 4, 22:25 UTC55m
2026-07-04 SKW3467 - Jul 4, 18:50 UTCJul 4, 20:05 UTC1h 15m
2026-07-04 SKW3450 - Jul 4, 17:00 UTCJul 4, 18:05 UTC1h 5m
2026-07-04 SKW3497 - Jul 4, 14:40 UTCJul 4, 15:55 UTC1h 15m
2026-07-04 SKW3022 - Jul 4, 00:40 UTCJul 4, 02:30 UTC1h 50m
2026-07-03 SKW3041 EUG → PDX Jul 3, 23:10 UTCJul 3, 23:35 UTC25m
2026-07-03 SKW3042 - Jul 3, 21:45 UTCJul 3, 22:15 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 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, SKW3033, SKW3470, SKW3345.