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sensors Mode-S transponder

A2CFA2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N280SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2CFA2
Octal
50547642
Decimal
10,669,986
Country
US
Tail
N280SY
Type
E75L
Broadcasting now · callsign SKW4126 · 2,575 ft
Flights observed
635
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Current position

A2CFA2 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A2CFA2 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
SKW4449 - 21 2026-06-21
SKW3718 - 16 2026-07-02
SKW3694 - 12 2026-06-23
SKW3765 SkyWest Airlines 11 2026-06-02
SKW3728 - 11 2026-06-23
SKW3701 - 11 2026-07-13
SKW3852 - 10 2026-06-30
SKW3693 SkyWest Airlines 10 2026-05-07
SKW108R - 10 2026-06-12
SKW3963 SkyWest Airlines 9 2026-06-03
SKW3820 SkyWest Airlines 9 2026-05-23
SKW4078 - 8 2026-07-09
SKW4052 SkyWest Airlines 8 2026-05-23
SKW4037 - 8 2026-07-02
SKW3786 SkyWest Airlines 8 2026-06-28
SKW3727 - 8 2026-06-27
SKW3723 SkyWest Airlines 8 2026-05-05
SKW3722 - 8 2026-06-29
SKW4069 - 7 2026-06-18
SKW4042 SkyWest Airlines 7 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW4126 - Jul 14, 01:00 UTCJul 14, 02:05 UTC1h 5m
2026-07-13 SKW3701 - Jul 13, 22:10 UTCJul 14, 00:00 UTC1h 50m
2026-07-13 SKW3959 SEA → BOI Jul 13, 19:51 UTCJul 13, 20:57 UTC1h 6m
2026-07-13 SKW3959 - Jul 13, 19:55 UTCJul 13, 21:00 UTC1h 5m
2026-07-13 SKW4075 SMF → SEA Jul 13, 15:05 UTCJul 13, 16:25 UTC1h 20m
2026-07-13 SKW4131 SEA → SMF Jul 13, 04:10 UTCJul 13, 05:55 UTC1h 45m
2026-07-13 SKW4153 SMF → SEA Jul 13, 00:35 UTCJul 13, 02:05 UTC1h 30m
2026-07-12 SKW4153 SEA → SMF Jul 12, 21:55 UTCJul 12, 23:40 UTC1h 45m
2026-07-12 SKW112J YVR → SEA Jul 12, 18:45 UTCJul 12, 19:05 UTC20m
2026-07-12 SKW112J - Jul 12, 18:35 UTCJul 12, 19:10 UTC35m
2026-07-12 SKW123J SEA → YVR Jul 12, 16:35 UTCJul 12, 17:10 UTC35m
2026-07-12 SKW118R - Jul 12, 13:10 UTCJul 12, 14:20 UTC1h 10m
2026-07-12 SKW3688 SEA → BOI Jul 12, 00:01 UTCJul 12, 01:00 UTC1h 0m
2026-07-11 SKW3911 ABQ → SEA Jul 11, 19:45 UTCJul 11, 22:40 UTC2h 55m
2026-07-11 SKW3911 SEA → ABQ Jul 11, 15:50 UTCJul 11, 18:30 UTC2h 40m
2026-07-11 SKW118R - Jul 11, 13:15 UTCJul 11, 14:25 UTC1h 10m
2026-07-11 SKW4148 - Jul 11, 03:01 UTCJul 11, 04:25 UTC1h 25m
2026-07-11 SKW4148 LAX → BOI Jul 11, 03:08 UTCJul 11, 04:25 UTC1h 17m
2026-07-10 SKW3799 - Jul 10, 23:30 UTCJul 11, 01:55 UTC2h 25m
2026-07-10 SKW3794 - Jul 10, 20:15 UTCJul 10, 22:20 UTC2h 5m
2026-07-10 SKW3794 LAX → GEG Jul 10, 20:19 UTCJul 10, 22:15 UTC1h 56m
2026-07-10 SKW4099 - Jul 10, 17:45 UTCJul 10, 18:50 UTC1h 5m
2026-07-10 SKW4099 - Jul 10, 15:40 UTCJul 10, 16:40 UTC1h 0m
2026-07-10 SKW3969 - Jul 10, 13:20 UTCJul 10, 14:25 UTC1h 5m
2026-07-10 SKW4083 - Jul 10, 05:10 UTCJul 10, 06:15 UTC1h 5m
2026-07-10 SKW4126 - Jul 10, 03:00 UTCJul 10, 04:05 UTC1h 5m
2026-07-10 SKW4126 - Jul 10, 00:15 UTCJul 10, 01:20 UTC1h 5m
2026-07-09 SKW4002 - Jul 9, 22:45 UTCJul 9, 23:10 UTC25m
2026-07-09 SKW4002 SAN → LAX Jul 9, 22:20 UTCJul 9, 23:08 UTC48m
2026-07-09 SKW3741 LAS → SAN Jul 9, 20:10 UTCJul 9, 20:55 UTC45m
2026-07-09 SKW4078 - Jul 9, 18:05 UTCJul 9, 18:50 UTC45m
2026-07-09 SKW4078 SNA → LAS Jul 9, 17:53 UTCJul 9, 18:48 UTC55m
2026-07-09 SKW4078 LAS → SNA Jul 9, 16:05 UTCJul 9, 16:45 UTC40m
2026-07-09 SKW4179 - Jul 9, 03:20 UTCJul 9, 04:05 UTC45m
2026-07-09 SKW4179 - Jul 9, 01:10 UTCJul 9, 01:50 UTC40m
2026-07-08 SKW3751 - Jul 8, 23:05 UTCJul 9, 00:00 UTC55m
2026-07-08 SKW4001 - Jul 8, 21:45 UTCJul 8, 22:15 UTC30m
2026-07-08 SKW4108 LAX → ABQ Jul 8, 18:25 UTCJul 8, 20:00 UTC1h 35m
2026-07-08 SKW4108 LAX → ABQ Jul 8, 15:35 UTCJul 8, 17:05 UTC1h 30m
2026-07-08 SKW3969 PIT → BOS Jul 8, 13:15 UTCJul 8, 14:20 UTC1h 5m
2026-07-08 SKW4083 - Jul 8, 04:40 UTCJul 8, 05:45 UTC1h 5m
2026-07-08 SKW4126 - Jul 8, 02:20 UTCJul 8, 03:25 UTC1h 5m
2026-07-08 SKW4126 RNO → LAX Jul 8, 02:11 UTCJul 8, 03:19 UTC1h 8m
2026-07-08 SKW4126 - Jul 8, 00:00 UTCJul 8, 00:55 UTC55m
2026-07-07 SKW4002 - Jul 7, 22:15 UTCJul 7, 22:40 UTC25m
2026-07-07 SKW4002 SAN → LAX Jul 7, 22:23 UTCJul 7, 22:40 UTC17m
2026-07-07 SKW3741 - Jul 7, 20:15 UTCJul 7, 21:00 UTC45m
2026-07-07 SKW4078 SNA → LAS Jul 7, 17:55 UTCJul 7, 18:35 UTC40m
2026-07-07 SKW4078 SNA → LAS Jul 7, 15:55 UTCJul 7, 16:35 UTC40m
2026-07-07 SKW4179 - Jul 7, 03:20 UTCJul 7, 04:05 UTC45m

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 N280SY page for operator, model, and routing details .

Mode-S A2CFA2 frequently asked

What is Mode-S code A2CFA2?
A2CFA2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N280SY.
Where is Mode-S A2CFA2 registered?
Mode-S code A2CFA2 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 A2CFA2 broadcasting right now?
Yes. Mode-S A2CFA2 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CFA2, octal 50547642, decimal 10,669,986.
What flights does A2CFA2 operate?
Mode-S A2CFA2 has broadcast 20 distinct callsigns, including SKW4449, SKW3718, SKW3694, SKW3765, SKW3728.