Apparatus

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sensors Mode-S transponder

A23914

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N242SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A23914
Octal
50434424
Decimal
10,631,444
Country
US
Tail
N242SY
Type
E75L
No current signal · last broadcast 1h ago
Flights observed
625
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A23914.

Country allocation

The ICAO 24-bit address A23914 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
SKW3991 SkyWest Airlines 13 2026-05-28
SKW3804 - 10 2026-06-23
SKW3918 SkyWest Airlines 9 2026-06-04
SKW4104 - 8 2026-06-20
SKW3902 SkyWest Airlines 8 2026-06-02
SKW3842 SkyWest Airlines 8 2026-05-30
SKW3630 SkyWest Airlines 8 2026-05-06
SKW4062 SkyWest Airlines 7 2026-05-29
SKW3828 - 7 2026-06-22
SKW138Y SkyWest Airlines 7 2026-06-03
SKW4126 SkyWest Airlines 6 2026-06-03
SKW4119 SkyWest Airlines 6 2026-06-02
SKW4112 - 6 2026-07-09
SKW4081 SkyWest Airlines 6 2026-05-06
SKW4074 SkyWest Airlines 6 2026-05-07
SKW4063 - 6 2026-07-11
SKW3999 SkyWest Airlines 6 2026-05-22
SKW3960 - 6 2026-06-27
SKW3951 SkyWest Airlines 6 2026-05-30
SKW3876 - 6 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW135K MSP → YWG Jul 14, 03:05 UTCJul 14, 04:05 UTC1h 0m
2026-07-13 SKW4005 YWG → MSP Jul 13, 22:50 UTCJul 13, 23:55 UTC1h 5m
2026-07-13 SKW4005 YWG → MSP Jul 13, 22:54 UTCJul 13, 23:44 UTC50m
2026-07-13 SKW182J MSP → YWG Jul 13, 20:30 UTCJul 13, 21:35 UTC1h 5m
2026-07-13 SKW157E YWG → MSP Jul 13, 18:30 UTCJul 13, 19:30 UTC1h 0m
2026-07-13 SKW197F MSP → YWG Jul 13, 15:25 UTCJul 13, 16:35 UTC1h 10m
2026-07-13 SKW4458 UES → MSP Jul 13, 13:15 UTCJul 13, 14:00 UTC45m
2026-07-13 SKW4468 MSP → MKE Jul 13, 01:56 UTCJul 13, 02:30 UTC34m
2026-07-13 SKW4468 - Jul 13, 01:40 UTCJul 13, 02:30 UTC50m
2026-07-12 SKW3935 - Jul 12, 23:05 UTCJul 12, 23:55 UTC50m
2026-07-12 SKW3935 - Jul 12, 20:35 UTCJul 12, 21:45 UTC1h 10m
2026-07-12 SKW3989 - Jul 12, 17:25 UTCJul 12, 19:01 UTC1h 35m
2026-07-12 SKW3989 - Jul 12, 14:30 UTCJul 12, 16:15 UTC1h 45m
2026-07-12 SKW3660 YWG → MSP Jul 12, 11:53 UTCJul 12, 12:41 UTC48m
2026-07-12 SKW3660 YWG → MSP Jul 12, 11:45 UTCJul 12, 12:45 UTC1h 0m
2026-07-12 SKW135K MSP → YWG Jul 12, 03:05 UTCJul 12, 04:10 UTC1h 5m
2026-07-11 SKW4005 YWG → MSP Jul 11, 23:05 UTCJul 12, 00:05 UTC1h 0m
2026-07-11 SKW182J MSP → YWG Jul 11, 20:45 UTCJul 11, 21:27 UTC42m
2026-07-11 SKW182J - Jul 11, 20:25 UTCJul 11, 21:00 UTC35m
2026-07-11 SKW3989 - Jul 11, 17:20 UTCJul 11, 19:10 UTC1h 50m
2026-07-11 SKW3989 - Jul 11, 14:25 UTCJul 11, 15:55 UTC1h 30m
2026-07-11 SKW3660 YWG → MSP Jul 11, 11:50 UTCJul 11, 12:50 UTC1h 0m
2026-07-11 SKW135K MSP → YWG Jul 11, 03:15 UTCJul 11, 04:20 UTC1h 5m
2026-07-11 SKW4063 - Jul 11, 00:20 UTCJul 11, 02:10 UTC1h 50m
2026-07-11 SKW4063 MEM → MSP Jul 11, 00:26 UTCJul 11, 02:01 UTC1h 35m
2026-07-10 SKW4063 - Jul 10, 21:05 UTCJul 10, 22:55 UTC1h 50m
2026-07-10 SKW3848 - Jul 10, 18:55 UTCJul 10, 19:45 UTC50m
2026-07-10 SKW4114 SLC → OMA Jul 10, 15:55 UTCJul 10, 17:50 UTC1h 55m
2026-07-10 SKW4061 OAK → SLC Jul 10, 13:10 UTCJul 10, 14:35 UTC1h 25m
2026-07-10 SKW4061 OAK → SLC Jul 10, 13:04 UTCJul 10, 14:22 UTC1h 18m
2026-07-10 SKW3797 SLC → OAK Jul 10, 05:05 UTCJul 10, 06:45 UTC1h 40m
2026-07-10 SKW3797 SLC → OAK Jul 10, 05:02 UTCJul 10, 06:32 UTC1h 30m
2026-07-10 SKW4009 YVR → SLC Jul 10, 01:50 UTCJul 10, 03:35 UTC1h 45m
2026-07-09 SKW3585 SLC → YVR Jul 9, 22:30 UTCJul 10, 00:35 UTC2h 5m
2026-07-09 SKW4112 - Jul 9, 20:05 UTCJul 9, 20:50 UTC45m
2026-07-09 SKW4112 MSO → SLC Jul 9, 19:27 UTCJul 9, 20:44 UTC1h 17m
2026-07-09 SKW4112 - Jul 9, 17:05 UTCJul 9, 18:05 UTC1h 0m
2026-07-09 SKW4237 - Jul 9, 15:05 UTCJul 9, 15:45 UTC40m
2026-07-09 SKW4263 - Jul 9, 00:00 UTCJul 9, 00:35 UTC35m
2026-07-07 SKW4114 SLC → SLC Jul 7, 15:50 UTCJul 7, 16:40 UTC50m
2026-07-07 SKW3708 - Jul 7, 13:20 UTCJul 7, 14:45 UTC1h 25m
2026-07-07 SKW137C SLC → EUG Jul 7, 05:05 UTCJul 7, 06:35 UTC1h 30m
2026-07-07 SKW3937 SJC → SLC Jul 7, 02:15 UTCJul 7, 03:40 UTC1h 25m
2026-07-06 SKW3937 SLC → SJC Jul 6, 23:30 UTCJul 7, 01:00 UTC1h 30m
2026-07-06 SKW3801 MFR → SLC Jul 6, 20:50 UTCJul 6, 22:15 UTC1h 25m
2026-07-06 SKW3779 SEA → MFR Jul 6, 18:35 UTCJul 6, 19:45 UTC1h 10m
2026-07-06 SKW3779 SEA → MFR Jul 6, 18:35 UTCJul 6, 19:30 UTC55m
2026-07-06 SKW3695 - Jul 6, 14:25 UTCJul 6, 16:35 UTC2h 10m
2026-07-06 SKW3695 SNA → SEA Jul 6, 14:14 UTCJul 6, 16:35 UTC2h 21m
2026-07-06 SKW3932 - Jul 6, 03:15 UTCJul 6, 05:35 UTC2h 20m

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 N242SY page for operator, model, and routing details .

Mode-S A23914 frequently asked

What is Mode-S code A23914?
A23914 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N242SY.
Where is Mode-S A23914 registered?
Mode-S code A23914 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 A23914 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A23914, octal 50434424, decimal 10,631,444.
What flights does A23914 operate?
Mode-S A23914 has broadcast 20 distinct callsigns, including SKW3991, SKW3804, SKW3918, SKW4104, SKW3902.