Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4C849

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N407SY · operated by SKYWEST AIRLINES INC

Hex
A4C849
Octal
51144111
Decimal
10,799,177
Country
US
Tail
N407SY
Type
E75L
Broadcasting now · callsign SKW3370 · 30,775 ft
Flights observed
615
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

Current position

A4C849 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A4C849 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
SKW3433 - 12 2026-07-06
SKW3324 SkyWest Airlines 12 2026-07-26
SKW3440 SkyWest Airlines 8 2026-06-18
SKW3076 - 8 2026-07-17
SKW3027 SkyWest Airlines 8 2026-05-20
SKW3404 SkyWest Airlines 7 2026-06-06
SKW9791 - 6 2026-06-30
SKW3121 - 6 2026-07-06
SKW3086 SkyWest Airlines 6 2026-07-18
SKW3047 - 6 2026-06-17
SKW3018 - 6 2026-07-06
SKW3498 SkyWest Airlines 5 2026-07-20
SKW3493 SkyWest Airlines 5 2026-05-27
SKW3483 - 5 2026-07-11
SKW3465 SkyWest Airlines 5 2026-06-07
SKW3381 SkyWest Airlines 5 2026-07-20
SKW3290 SkyWest Airlines 5 2026-05-20
SKW3087 - 5 2026-07-20
SKW3073 - 5 2026-07-03
SKW3070 - 5 2026-07-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3398 PDX → SBP Jul 26, 19:00 UTCJul 26, 20:30 UTC1h 30m
2026-07-26 SKW3324 SNA → SFO Jul 26, 15:35 UTCJul 26, 17:13 UTC1h 38m
2026-07-26 SKW3324 SNA → SFO Jul 26, 15:25 UTCJul 26, 17:20 UTC1h 55m
2026-07-26 SKW3323 LAX → PDX Jul 26, 02:25 UTCJul 26, 04:05 UTC1h 40m
2026-07-25 SKW3398 PDX → SBP Jul 25, 18:10 UTCJul 25, 23:55 UTC5h 45m
2026-07-25 SKW3480 BZN → SAN Jul 25, 15:40 UTCJul 25, 16:50 UTC1h 10m
2026-07-25 SKW3480 BZN → SAN Jul 25, 14:55 UTCJul 25, 15:10 UTC15m
2026-07-25 SKW3413 SJC → BOI Jul 25, 03:20 UTCJul 25, 04:30 UTC1h 10m
2026-07-25 SKW3068 SAN → PHX Jul 25, 01:45 UTCJul 25, 02:40 UTC55m
2026-07-24 SKW3311 SJC → LAX Jul 24, 23:05 UTCJul 25, 00:25 UTC1h 20m
2026-07-24 SKW3218 CVG → ORD Jul 24, 19:40 UTCJul 24, 20:40 UTC1h 0m
2026-07-24 SKW3059 SJC → LAX Jul 24, 17:25 UTCJul 24, 18:35 UTC1h 10m
2026-07-24 SKW864W SAN → SJC Jul 24, 15:00 UTCJul 24, 15:55 UTC55m
2026-07-24 SKW3020 SNA → SFO Jul 24, 04:00 UTCJul 24, 06:00 UTC2h 0m
2026-07-24 SKW3012 STS → SAN Jul 24, 00:50 UTCJul 24, 03:00 UTC2h 10m
2026-07-23 SKW3482 SFO → SAN Jul 23, 22:15 UTCJul 23, 23:30 UTC1h 15m
2026-07-23 SKW3486 BOI → SFO Jul 23, 20:00 UTCJul 23, 21:00 UTC1h 0m
2026-07-23 SKW3287 SJC → LAX Jul 23, 17:50 UTCJul 23, 19:05 UTC1h 15m
2026-07-23 SKW3233 PHX → OKC Jul 23, 15:40 UTCJul 23, 16:55 UTC1h 15m
2026-07-23 SKW3455 SJC → LAX Jul 23, 13:20 UTCJul 23, 14:35 UTC1h 15m
2026-07-23 SKW3455 SJC → LAX Jul 23, 13:21 UTCJul 23, 14:29 UTC1h 8m
2026-07-23 SKW3067 LAX → SFO Jul 23, 06:05 UTCJul 23, 06:55 UTC50m
2026-07-23 SKW3072 SAN → SFO Jul 23, 02:45 UTCJul 23, 04:40 UTC1h 55m
2026-07-23 SKW3065 PHX → STS Jul 23, 00:00 UTCJul 23, 01:45 UTC1h 45m
2026-07-22 SKW3352 SAN → SFO Jul 22, 21:35 UTCJul 22, 22:45 UTC1h 10m
2026-07-22 SKW3455 SJC → LAX Jul 22, 16:15 UTCJul 22, 17:30 UTC1h 15m
2026-07-22 SKW3455 SJC → LAX Jul 22, 16:14 UTCJul 22, 17:22 UTC1h 8m
2026-07-22 SKW3226 HPN → ORD Jul 22, 02:10 UTCJul 22, 03:30 UTC1h 20m
2026-07-21 SKW3071 DTW → ORD Jul 21, 23:10 UTCJul 22, 00:45 UTC1h 35m
2026-07-21 SKW3349 - Jul 21, 19:00 UTCJul 21, 21:20 UTC2h 20m
2026-07-21 SKW3351 SAN → SJC Jul 21, 15:40 UTCJul 21, 17:40 UTC2h 0m
2026-07-21 SKW3050 SEA → EUG Jul 21, 13:05 UTCJul 21, 14:10 UTC1h 5m
2026-07-21 SKW3410 PSP → SFO Jul 21, 04:15 UTCJul 21, 05:50 UTC1h 35m
2026-07-20 SKW3498 SAN → FCA Jul 20, 22:45 UTCJul 21, 02:50 UTC4h 4m
2026-07-20 SKW3087 MFR → SEA Jul 20, 20:46 UTCJul 20, 21:29 UTC43m
2026-07-20 SKW3087 MFR → SEA Jul 20, 20:40 UTCJul 20, 21:30 UTC50m
2026-07-20 SKW3088 SFO → SNA Jul 20, 18:40 UTCJul 20, 19:50 UTC1h 10m
2026-07-20 SKW3381 STS → SAN Jul 20, 15:45 UTCJul 20, 17:25 UTC1h 40m
2026-07-20 SKW3381 STS → SAN Jul 20, 15:31 UTCJul 20, 17:23 UTC1h 52m
2026-07-20 SKW3291 DFW → ASE Jul 20, 00:55 UTCJul 20, 02:35 UTC1h 40m
2026-07-19 SKW3202 LAX → PDX Jul 19, 22:55 UTCJul 19, 23:50 UTC55m
2026-07-19 SKW3075 STS → PSP Jul 19, 20:25 UTCJul 19, 21:55 UTC1h 30m
2026-07-19 SKW3075 STS → PSP Jul 19, 20:03 UTCJul 19, 21:55 UTC1h 52m
2026-07-19 SKW3205 SAN → SFO Jul 19, 17:57 UTCJul 19, 18:55 UTC58m
2026-07-19 SKW3205 SAN → SFO Jul 19, 17:55 UTCJul 19, 19:00 UTC1h 5m
2026-07-19 SKW3235 BOI → SAN Jul 19, 14:05 UTCJul 19, 16:10 UTC2h 5m
2026-07-19 SKW3375 - Jul 19, 02:40 UTCJul 19, 03:50 UTC1h 10m
2026-07-19 SKW3375 SFO → BOI Jul 19, 02:46 UTCJul 19, 03:49 UTC1h 3m
2026-07-18 SKW3070 GEG → SFO Jul 18, 23:35 UTCJul 19, 01:30 UTC1h 55m
2026-07-18 SKW3262 BFL → PHX Jul 18, 21:40 UTCJul 18, 22:30 UTC50m

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 N407SY page for operator, model, and routing details .

Mode-S A4C849 frequently asked

What is Mode-S code A4C849?
A4C849 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N407SY.
Where is Mode-S A4C849 registered?
Mode-S code A4C849 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 A4C849 broadcasting right now?
Yes. Mode-S A4C849 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4C849, octal 51144111, decimal 10,799,177.
What flights does A4C849 operate?
Mode-S A4C849 has broadcast 20 distinct callsigns, including SKW3433, SKW3324, SKW3440, SKW3076, SKW3027.