Apparatus

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sensors Mode-S transponder

A671F2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N514SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A671F2
Octal
51470762
Decimal
10,908,146
Country
US
Tail
N514SY
Type
E75L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
663
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A671F2.

Country allocation

The ICAO 24-bit address A671F2 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
SKW5005 SkyWest Airlines 25 2026-07-26
SKW6415 SkyWest Airlines 19 2026-07-21
SKW6308 SkyWest Airlines 19 2026-05-09
SKW6330 SkyWest Airlines 18 2026-07-26
SKW6278 SkyWest Airlines 17 2026-07-25
SKW4991 SkyWest Airlines 17 2026-05-12
SKW6425 SkyWest Airlines 16 2026-07-25
SKW4992 SkyWest Airlines 16 2026-05-10
SKW6409 - 14 2026-07-12
SKW6307 SkyWest Airlines 14 2026-07-24
SKW4915 SkyWest Airlines 14 2026-05-10
SKW6221 SkyWest Airlines 13 2026-07-21
SKW6435 - 12 2026-07-17
SKW6188 - 12 2026-06-14
SKW4995 - 12 2026-06-17
SKW4985 SkyWest Airlines 12 2026-05-08
SKW4958 - 11 2026-07-01
SKW4898 - 11 2026-07-13
SKW4895 SkyWest Airlines 11 2026-07-26
SKW4951 - 10 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5005 PHX → STS Jul 26, 21:25 UTCJul 26, 22:30 UTC1h 5m
2026-07-26 SKW6330 BTV → ORD Jul 26, 19:00 UTCJul 26, 20:05 UTC1h 5m
2026-07-26 SKW6330 BTV → ORD Jul 26, 16:50 UTCJul 26, 17:45 UTC55m
2026-07-26 SKW4895 DFW → MFE Jul 26, 12:35 UTCJul 26, 15:10 UTC2h 35m
2026-07-26 SKW9920 CMH → DFW Jul 26, 03:45 UTCJul 26, 06:25 UTC2h 40m
2026-07-25 SKW6278 PHX → BFL Jul 25, 23:20 UTCJul 26, 02:15 UTC2h 55m
2026-07-25 SKW6278 PHX → BFL Jul 25, 19:20 UTCJul 25, 22:10 UTC2h 50m
2026-07-25 SKW6425 MAF → DFW Jul 25, 17:35 UTCJul 25, 18:15 UTC40m
2026-07-25 SKW6425 MAF → DFW Jul 25, 15:30 UTCJul 25, 16:20 UTC50m
2026-07-25 SKW6346 ORD → BNA Jul 25, 02:35 UTCJul 25, 03:45 UTC1h 10m
2026-07-25 SKW6346 ORD → BNA Jul 25, 02:33 UTCJul 25, 03:45 UTC1h 12m
2026-07-25 SKW6346 ORD → BNA Jul 25, 00:40 UTCJul 25, 01:40 UTC1h 0m
2026-07-24 SKW6307 DFW → SHV Jul 24, 20:25 UTCJul 24, 23:05 UTC2h 40m
2026-07-24 SKW6307 DFW → SHV Jul 24, 16:45 UTCJul 24, 19:30 UTC2h 45m
2026-07-24 SKW6185 SFO → LAX Jul 24, 12:20 UTCJul 24, 15:00 UTC2h 40m
2026-07-23 SKW4979 DFW → MLU Jul 23, 23:40 UTCJul 24, 02:30 UTC2h 50m
2026-07-23 SKW6272 MRY → PHX Jul 23, 19:35 UTCJul 23, 22:20 UTC2h 45m
2026-07-23 SKW6272 MRY → PHX Jul 23, 19:30 UTCJul 23, 22:19 UTC2h 49m
2026-07-23 SKW6272 MRY → PHX Jul 23, 15:55 UTCJul 23, 18:30 UTC2h 35m
2026-07-23 SKW6294 SFO → LAX Jul 23, 13:10 UTCJul 23, 14:10 UTC1h 0m
2026-07-23 SKW6510 LAX → SFO Jul 23, 05:50 UTCJul 23, 06:45 UTC55m
2026-07-23 SKW6510 LAX → SFO Jul 23, 05:49 UTCJul 23, 06:48 UTC59m
2026-07-23 SKW5005 PHX → STS Jul 23, 01:30 UTCJul 23, 04:15 UTC2h 45m
2026-07-23 SKW5005 PHX → STS Jul 23, 01:26 UTCJul 23, 04:14 UTC2h 48m
2026-07-22 SKW5005 PHX → STS Jul 22, 21:20 UTCJul 23, 00:25 UTC3h 5m
2026-07-22 SKW4977 - Jul 22, 15:45 UTCJul 22, 20:05 UTC4h 20m
2026-07-22 SKW6227 MCI → ORD Jul 22, 11:25 UTCJul 22, 14:30 UTC3h 5m
2026-07-22 SKW6227 MCI → ORD Jul 22, 11:12 UTCJul 22, 14:29 UTC3h 17m
2026-07-22 SKW6224 ABQ → LAX Jul 22, 01:50 UTCJul 22, 04:45 UTC2h 55m
2026-07-21 SKW6221 FAT → PHX Jul 21, 23:35 UTCJul 22, 00:35 UTC1h 0m
2026-07-21 SKW6221 FAT → PHX Jul 21, 21:35 UTCJul 21, 22:30 UTC55m
2026-07-21 SKW4887 - Jul 21, 18:10 UTCJul 21, 19:40 UTC1h 30m
2026-07-21 SKW4887 - Jul 21, 15:45 UTCJul 21, 17:25 UTC1h 40m
2026-07-21 SKW6393 TUS → LAX Jul 21, 13:30 UTCJul 21, 14:50 UTC1h 20m
2026-07-21 SKW6393 TUS → LAX Jul 21, 13:29 UTCJul 21, 14:40 UTC1h 11m
2026-07-21 SKW6370 PHX → TUS Jul 21, 02:45 UTCJul 21, 03:10 UTC25m
2026-07-21 SKW6415 LCH → DFW Jul 21, 00:25 UTCJul 21, 01:30 UTC1h 5m
2026-07-21 SKW6415 LCH → DFW Jul 21, 00:21 UTCJul 21, 01:27 UTC1h 6m
2026-07-20 SKW6415 LCH → DFW Jul 20, 22:15 UTCJul 20, 23:20 UTC1h 5m
2026-07-20 SKW4925 HMO → PHX Jul 20, 19:40 UTCJul 20, 20:35 UTC55m
2026-07-20 SKW4925 PHX → HMO Jul 20, 17:50 UTCJul 20, 18:45 UTC55m
2026-07-20 SKW4983 - Jul 20, 13:05 UTCJul 20, 15:55 UTC2h 50m
2026-07-20 SKW4983 CID → PHX Jul 20, 13:01 UTCJul 20, 15:51 UTC2h 50m
2026-07-20 SKW4982 - Jul 20, 02:30 UTCJul 20, 05:10 UTC2h 40m
2026-07-20 SKW4968 LEX → ORD Jul 20, 00:00 UTCJul 20, 01:20 UTC1h 20m
2026-07-19 SKW4968 LEX → ORD Jul 19, 21:45 UTCJul 19, 22:55 UTC1h 10m
2026-07-19 SKW4925 HMO → PHX Jul 19, 19:15 UTCJul 19, 20:20 UTC1h 5m
2026-07-19 SKW4925 PHX → HMO Jul 19, 17:15 UTCJul 19, 18:05 UTC50m
2026-07-19 SKW4983 - Jul 19, 13:00 UTCJul 19, 15:35 UTC2h 35m
2026-07-19 SKW4982 - Jul 19, 02:25 UTCJul 19, 05:10 UTC2h 45m

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 N514SY page for operator, model, and routing details .

Mode-S A671F2 frequently asked

What is Mode-S code A671F2?
A671F2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N514SY.
Where is Mode-S A671F2 registered?
Mode-S code A671F2 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 A671F2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A671F2, octal 51470762, decimal 10,908,146.
What flights does A671F2 operate?
Mode-S A671F2 has broadcast 20 distinct callsigns, including SKW5005, SKW6415, SKW6308, SKW6330, SKW6278.