Apparatus

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sensors Mode-S transponder

A34C2F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N311SY · operated by SKYWEST AIRLINES INC

Hex
A34C2F
Octal
50646057
Decimal
10,701,871
Country
US
Tail
N311SY
Type
E75L
No current signal · last broadcast 2h ago
Flights observed
652
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A34C2F.

Country allocation

The ICAO 24-bit address A34C2F 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
SKW4119 - 15 2026-07-11
SKW3902 - 12 2026-07-05
SKW3974 SkyWest Airlines 10 2026-05-04
SKW3965 SkyWest Airlines 10 2026-05-04
SKW3841 - 10 2026-06-25
SKW3923 - 9 2026-07-07
SKW3783 SkyWest Airlines 8 2026-05-01
SKW3712 - 8 2026-07-04
SKW4155 SkyWest Airlines 7 2026-05-06
SKW4087 - 7 2026-07-13
SKW3915 SkyWest Airlines 7 2026-05-23
SKW3802 SkyWest Airlines 7 2026-06-01
SKW3693 SkyWest Airlines 7 2026-06-23
SKW4106 - 6 2026-07-13
SKW4077 - 6 2026-07-06
SKW4057 - 6 2026-07-06
SKW4035 - 6 2026-06-15
SKW3978 SkyWest Airlines 6 2026-05-05
SKW3894 - 6 2026-07-12
SKW3755 - 6 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW4472 SEA → PDX Jul 14, 06:45 UTCJul 14, 07:20 UTC35m
2026-07-14 SKW3832 GEG → SEA Jul 14, 03:25 UTCJul 14, 04:20 UTC55m
2026-07-14 SKW3832 SEA → GEG Jul 14, 01:20 UTCJul 14, 02:00 UTC40m
2026-07-13 SKW3679 TUS → SEA Jul 13, 19:00 UTCJul 13, 21:45 UTC2h 45m
2026-07-13 SKW138Y LAX → TUS Jul 13, 16:55 UTCJul 13, 18:05 UTC1h 10m
2026-07-13 SKW4106 - Jul 13, 14:20 UTCJul 13, 15:30 UTC1h 10m
2026-07-13 SKW4106 RNO → LAX Jul 13, 14:23 UTCJul 13, 15:29 UTC1h 6m
2026-07-13 SKW3929 - Jul 13, 05:15 UTCJul 13, 06:10 UTC55m
2026-07-13 SKW4087 - Jul 13, 03:20 UTCJul 13, 03:45 UTC25m
2026-07-13 SKW4087 - Jul 13, 01:50 UTCJul 13, 02:20 UTC30m
2026-07-12 SKW3894 - Jul 12, 23:20 UTCJul 13, 00:20 UTC1h 0m
2026-07-12 SKW3894 - Jul 12, 21:00 UTCJul 12, 22:10 UTC1h 10m
2026-07-12 SKW3755 SMF → LAX Jul 12, 18:30 UTCJul 12, 19:40 UTC1h 10m
2026-07-12 SKW3755 LAX → SMF Jul 12, 16:15 UTCJul 12, 17:15 UTC1h 0m
2026-07-12 SKW3725 - Jul 12, 13:55 UTCJul 12, 15:10 UTC1h 15m
2026-07-12 SKW3725 - Jul 12, 13:10 UTCJul 12, 13:25 UTC15m
2026-07-12 SKW4148 - Jul 12, 03:01 UTCJul 12, 04:25 UTC1h 25m
2026-07-12 SKW4148 LAX → BOI Jul 12, 03:08 UTCJul 12, 04:23 UTC1h 15m
2026-07-11 SKW3799 - Jul 11, 23:20 UTCJul 12, 01:50 UTC2h 30m
2026-07-11 SKW3794 - Jul 11, 20:15 UTCJul 11, 22:10 UTC1h 55m
2026-07-11 SKW4119 - Jul 11, 17:55 UTCJul 11, 18:55 UTC1h 0m
2026-07-11 SKW4119 PHX → LAX Jul 11, 17:53 UTCJul 11, 18:50 UTC57m
2026-07-11 SKW4119 - Jul 11, 14:50 UTCJul 11, 15:55 UTC1h 5m
2026-07-11 SKW3759 SMF → LAX Jul 11, 04:01 UTCJul 11, 05:10 UTC1h 10m
2026-07-11 SKW3759 - Jul 11, 01:50 UTCJul 11, 02:50 UTC1h 0m
2026-07-10 SKW3822 - Jul 10, 23:45 UTCJul 11, 00:40 UTC55m
2026-07-10 SKW3822 SJC → LAX Jul 10, 23:36 UTCJul 11, 00:32 UTC56m
2026-07-10 SKW3822 - Jul 10, 21:55 UTCJul 10, 22:45 UTC50m
2026-07-10 SKW3951 - Jul 10, 19:30 UTCJul 10, 20:25 UTC55m
2026-07-10 SKW3951 - Jul 10, 17:15 UTCJul 10, 18:20 UTC1h 5m
2026-07-10 SKW3696 GEG → LAX Jul 10, 13:35 UTCJul 10, 15:55 UTC2h 20m
2026-07-10 SKW3576 - Jul 10, 04:50 UTCJul 10, 06:55 UTC2h 5m
2026-07-10 SKW3576 LAX → GEG Jul 10, 04:53 UTCJul 10, 06:55 UTC2h 2m
2026-07-10 SKW4087 SAN → LAX Jul 10, 03:19 UTCJul 10, 03:40 UTC21m
2026-07-10 SKW4087 SAN → LAX Jul 10, 03:15 UTCJul 10, 03:45 UTC30m
2026-07-10 SKW4087 - Jul 10, 01:50 UTCJul 10, 02:15 UTC25m
2026-07-09 SKW3894 - Jul 9, 23:25 UTCJul 10, 00:20 UTC55m
2026-07-09 SKW3894 - Jul 9, 21:05 UTCJul 9, 22:10 UTC1h 5m
2026-07-09 SKW3755 - Jul 9, 18:30 UTCJul 9, 19:35 UTC1h 5m
2026-07-09 SKW3755 - Jul 9, 16:15 UTCJul 9, 17:20 UTC1h 5m
2026-07-09 SKW3725 - Jul 9, 13:05 UTCJul 9, 14:55 UTC1h 50m
2026-07-09 SKW3692 - Jul 9, 02:45 UTCJul 9, 03:45 UTC1h 0m
2026-07-09 SKW3857 GEG → SEA Jul 9, 00:57 UTCJul 9, 01:30 UTC33m
2026-07-09 SKW3857 GEG → SEA Jul 9, 00:50 UTCJul 9, 01:35 UTC45m
2026-07-08 SKW3857 SEA → GEG Jul 8, 22:50 UTCJul 8, 23:35 UTC45m
2026-07-08 SKW3992 - Jul 8, 19:45 UTCJul 8, 20:25 UTC40m
2026-07-08 SKW3992 - Jul 8, 18:05 UTCJul 8, 18:35 UTC30m
2026-07-08 SKW4041 SJC → SEA Jul 8, 14:35 UTCJul 8, 16:20 UTC1h 45m
2026-07-08 SKW4041 SJC → SEA Jul 8, 14:36 UTCJul 8, 16:18 UTC1h 42m
2026-07-08 SKW3956 SEA → SJC Jul 8, 04:05 UTCJul 8, 05:55 UTC1h 50m

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 N311SY page for operator, model, and routing details .

Mode-S A34C2F frequently asked

What is Mode-S code A34C2F?
A34C2F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N311SY.
Where is Mode-S A34C2F registered?
Mode-S code A34C2F 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 A34C2F broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A34C2F, octal 50646057, decimal 10,701,871.
What flights does A34C2F operate?
Mode-S A34C2F has broadcast 20 distinct callsigns, including SKW4119, SKW3902, SKW3974, SKW3965, SKW3841.