Apparatus

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sensors Mode-S transponder

A389F8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N327SY · operated by SKYWEST AIRLINES INC

Hex
A389F8
Octal
50704770
Decimal
10,717,688
Country
US
Tail
N327SY
Type
E75L
Transponder active on ground
Flights observed
624
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A389F8.

Country allocation

The ICAO 24-bit address A389F8 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
SKW4031 - 14 2026-07-09
SKW3832 - 13 2026-07-06
SKW3783 SkyWest Airlines 12 2026-06-04
SKW4145 SkyWest Airlines 11 2026-05-09
SKW4100 - 11 2026-07-14
SKW4444 SkyWest Airlines 10 2026-07-03
SKW4105 SkyWest Airlines 9 2026-06-03
SKW4177 SkyWest Airlines 8 2026-05-24
SKW4070 - 8 2026-07-09
SKW3790 - 8 2026-07-08
SKW4047 - 7 2026-07-09
SKW3824 - 7 2026-07-04
SKW3802 - 7 2026-06-23
SKW3750 - 7 2026-07-05
SKW4174 - 6 2026-07-13
SKW4121 SkyWest Airlines 6 2026-05-27
SKW4067 SkyWest Airlines 6 2026-05-22
SKW4063 SkyWest Airlines 6 2026-06-03
SKW4036 - 6 2026-07-09
SKW3792 SkyWest Airlines 6 2026-05-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 SKW4124 - Jul 15, 01:40 UTCJul 15, 02:00 UTC20m
2026-07-14 SKW181H BFI → EUG Jul 14, 22:55 UTCJul 14, 23:45 UTC50m
2026-07-14 SKW3966 - Jul 14, 18:45 UTCJul 14, 20:50 UTC2h 5m
2026-07-14 SKW3966 - Jul 14, 15:05 UTCJul 14, 17:35 UTC2h 30m
2026-07-14 SKW4100 - Jul 14, 04:05 UTCJul 14, 05:35 UTC1h 30m
2026-07-14 SKW4100 SEA → SJC Jul 14, 01:20 UTCJul 14, 03:20 UTC2h 0m
2026-07-13 SKW4174 BZN → SEA Jul 13, 22:16 UTCJul 13, 23:49 UTC1h 33m
2026-07-13 SKW3906 - Jul 13, 20:15 UTCJul 13, 20:40 UTC25m
2026-07-13 SKW3681 BUR → SLC Jul 13, 18:00 UTCJul 13, 19:20 UTC1h 20m
2026-07-13 SKW3681 SLC → BUR Jul 13, 15:40 UTCJul 13, 17:10 UTC1h 30m
2026-07-13 SKW4138 - Jul 13, 13:15 UTCJul 13, 14:25 UTC1h 10m
2026-07-13 SKW3777 - Jul 13, 00:20 UTCJul 13, 00:30 UTC10m
2026-07-12 SKW3777 - Jul 12, 23:15 UTCJul 12, 23:50 UTC35m
2026-07-12 SKW3833 - Jul 12, 19:25 UTCJul 12, 20:35 UTC1h 10m
2026-07-12 SKW3833 - Jul 12, 17:15 UTCJul 12, 18:10 UTC55m
2026-07-12 SKW3796 - Jul 12, 12:55 UTCJul 12, 15:20 UTC2h 25m
2026-07-11 SKW3620 SLC → XNA Jul 11, 23:45 UTCJul 12, 01:55 UTC2h 10m
2026-07-11 SKW3765 - Jul 11, 21:45 UTCJul 11, 22:20 UTC35m
2026-07-11 SKW3765 - Jul 11, 19:45 UTCJul 11, 20:15 UTC30m
2026-07-11 SKW3681 BUR → SLC Jul 11, 17:00 UTCJul 11, 18:25 UTC1h 25m
2026-07-11 SKW3681 SLC → BUR Jul 11, 14:05 UTCJul 11, 15:40 UTC1h 35m
2026-07-11 SKW3937 SJC → SLC Jul 11, 02:15 UTCJul 11, 03:40 UTC1h 25m
2026-07-10 SKW3937 - Jul 10, 23:45 UTCJul 11, 01:20 UTC1h 35m
2026-07-10 SKW3801 MFR → SLC Jul 10, 20:50 UTCJul 10, 22:10 UTC1h 20m
2026-07-10 SKW3779 SEA → MFR Jul 10, 18:30 UTCJul 10, 19:35 UTC1h 5m
2026-07-10 SKW4128 EUG → SEA Jul 10, 13:25 UTCJul 10, 14:10 UTC45m
2026-07-10 SKW3855 - Jul 10, 05:50 UTCJul 10, 06:45 UTC55m
2026-07-10 SKW3999 - Jul 10, 02:05 UTCJul 10, 04:25 UTC2h 20m
2026-07-10 SKW3999 SNA → SEA Jul 10, 02:06 UTCJul 10, 04:25 UTC2h 19m
2026-07-09 SKW3999 - Jul 9, 22:45 UTCJul 10, 01:00 UTC2h 15m
2026-07-09 SKW4070 - Jul 9, 19:15 UTCJul 9, 21:30 UTC2h 15m
2026-07-09 SKW4070 SEA → ONT Jul 9, 15:50 UTCJul 9, 18:05 UTC2h 15m
2026-07-09 SKW4036 RDM → SEA Jul 9, 13:15 UTCJul 9, 14:05 UTC50m
2026-07-09 SKW4047 SEA → RDM Jul 9, 04:55 UTCJul 9, 05:30 UTC35m
2026-07-09 SKW4031 - Jul 9, 01:25 UTCJul 9, 03:45 UTC2h 20m
2026-07-08 SKW4031 SEA → ONT Jul 8, 21:55 UTCJul 9, 00:10 UTC2h 15m
2026-07-08 SKW3881 SMF → SEA Jul 8, 18:50 UTCJul 8, 20:25 UTC1h 35m
2026-07-08 SKW164T SEA → SMF Jul 8, 16:10 UTCJul 8, 17:35 UTC1h 25m
2026-07-08 SKW3790 GEG → SEA Jul 8, 14:15 UTCJul 8, 15:00 UTC45m
2026-07-08 SKW3790 GEG → SEA Jul 8, 14:20 UTCJul 8, 14:58 UTC38m
2026-07-08 SKW3677 SEA → GEG Jul 8, 03:20 UTCJul 8, 04:00 UTC40m
2026-07-08 SKW4124 - Jul 8, 01:05 UTCJul 8, 01:50 UTC45m
2026-07-08 SKW4124 EUG → SEA Jul 8, 01:01 UTCJul 8, 01:43 UTC42m
2026-07-07 SKW181H SEA → EUG Jul 7, 23:25 UTCJul 8, 00:15 UTC50m
2026-07-07 SKW4070 MSP → MSN Jul 7, 19:40 UTCJul 7, 22:00 UTC2h 20m
2026-07-07 SKW4070 MSP → MSN Jul 7, 16:25 UTCJul 7, 18:35 UTC2h 10m
2026-07-07 SKW4036 - Jul 7, 13:15 UTCJul 7, 14:05 UTC50m
2026-07-07 SKW4036 RDM → SEA Jul 7, 13:24 UTCJul 7, 14:01 UTC37m
2026-07-07 SKW4047 SEA → RDM Jul 7, 05:15 UTCJul 7, 05:55 UTC40m
2026-07-07 SKW3688 - Jul 7, 03:05 UTCJul 7, 04:10 UTC1h 5m

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 N327SY page for operator, model, and routing details .

Mode-S A389F8 frequently asked

What is Mode-S code A389F8?
A389F8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N327SY.
Where is Mode-S A389F8 registered?
Mode-S code A389F8 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 A389F8 broadcasting right now?
Mode-S A389F8 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A389F8, octal 50704770, decimal 10,717,688.
What flights does A389F8 operate?
Mode-S A389F8 has broadcast 20 distinct callsigns, including SKW4031, SKW3832, SKW3783, SKW4145, SKW4100.