Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 22:40 UTC
Flights observed
713
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:40 UTC

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
SKW4112 SkyWest Airlines 9 2026-07-25
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
SKW4146 SkyWest Airlines 7 2026-07-24
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
SKW4081 SkyWest Airlines 6 2026-05-06
SKW4074 SkyWest Airlines 6 2026-05-07
SKW4063 - 6 2026-07-11
SKW4053 SkyWest Airlines 6 2026-07-23
SKW3999 SkyWest Airlines 6 2026-05-22
SKW3989 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3906 MKE → DTW Jul 26, 19:40 UTCJul 26, 22:40 UTC3h 0m
2026-07-26 SKW3944 PDX → SEA Jul 26, 18:05 UTCJul 26, 18:40 UTC35m
2026-07-26 SKW3944 PDX → SEA Jul 26, 16:00 UTCJul 26, 16:25 UTC25m
2026-07-26 SKW4069 BWI → BOS Jul 26, 12:55 UTCJul 26, 14:25 UTC1h 30m
2026-07-26 SKW3803 DTW → MSN Jul 26, 04:15 UTCJul 26, 05:55 UTC1h 40m
2026-07-26 SKW3803 DTW → MSN Jul 26, 04:22 UTCJul 26, 05:52 UTC1h 30m
2026-07-26 SKW3798 JFK → BNA Jul 26, 01:00 UTCJul 26, 02:20 UTC1h 20m
2026-07-25 SKW3798 JFK → BNA Jul 25, 23:00 UTCJul 25, 23:55 UTC55m
2026-07-25 SKW4112 JFK → ORD Jul 25, 21:00 UTCJul 25, 22:05 UTC1h 5m
2026-07-25 SKW4112 JFK → ORD Jul 25, 20:45 UTCJul 25, 22:04 UTC1h 19m
2026-07-25 SKW4112 JFK → ORD Jul 25, 18:35 UTCJul 25, 19:35 UTC1h 0m
2026-07-25 SKW4627 DTW → ATL Jul 25, 14:50 UTCJul 25, 17:10 UTC2h 20m
2026-07-25 SKW4627 DTW → ATL Jul 25, 14:43 UTCJul 25, 17:09 UTC2h 26m
2026-07-25 SKW3577 GSP → DTW Jul 25, 01:05 UTCJul 25, 02:30 UTC1h 25m
2026-07-25 SKW3577 GSP → DTW Jul 25, 01:08 UTCJul 25, 02:29 UTC1h 21m
2026-07-24 SKW3577 GSP → DTW Jul 24, 22:40 UTCJul 25, 00:10 UTC1h 30m
2026-07-24 SKW3772 SFO → SEA Jul 24, 18:40 UTCJul 24, 20:40 UTC2h 0m
2026-07-24 SKW107K AUS → JAX Jul 24, 15:30 UTCJul 24, 17:35 UTC2h 5m
2026-07-24 SKW4146 MSN → MSP Jul 24, 12:25 UTCJul 24, 14:15 UTC1h 50m
2026-07-24 SKW4163 AUS → BNA Jul 24, 01:05 UTCJul 24, 02:55 UTC1h 50m
2026-07-23 SKW4053 ATL → EVV Jul 23, 23:15 UTCJul 24, 00:05 UTC50m
2026-07-23 SKW4053 ATL → EVV Jul 23, 21:40 UTCJul 23, 22:25 UTC45m
2026-07-23 SKW4121 MDW → DTW Jul 23, 19:40 UTCJul 23, 20:35 UTC55m
2026-07-23 SKW4177 AUS → MFE Jul 23, 17:55 UTCJul 23, 18:40 UTC45m
2026-07-23 SKW3950 JFK → IAD Jul 23, 14:35 UTCJul 23, 16:50 UTC2h 15m
2026-07-23 SKW4607 MSP → MSN Jul 23, 12:20 UTCJul 23, 13:10 UTC50m
2026-07-23 SKW3930 - Jul 23, 10:15 UTCJul 23, 10:50 UTC35m
2026-07-23 SKW3907 MDW → MSP Jul 23, 03:05 UTCJul 23, 03:25 UTC20m
2026-07-23 SKW4462 MSP → MKE Jul 23, 00:35 UTCJul 23, 01:35 UTC1h 0m
2026-07-23 SKW4462 MSP → MKE Jul 23, 00:39 UTCJul 23, 01:27 UTC48m
2026-07-22 SKW4462 MSP → MKE Jul 22, 22:20 UTCJul 22, 23:05 UTC45m
2026-07-22 SKW4032 HPN → ATL Jul 22, 20:10 UTCJul 22, 20:55 UTC45m
2026-07-22 SKW4032 HPN → ATL Jul 22, 19:53 UTCJul 22, 20:50 UTC57m
2026-07-22 SKW4032 HPN → ATL Jul 22, 18:10 UTCJul 22, 18:55 UTC45m
2026-07-22 SKW3561 BOI → SEA Jul 22, 16:10 UTCJul 22, 16:45 UTC35m
2026-07-22 SKW3561 BOI → SEA Jul 22, 14:20 UTCJul 22, 15:10 UTC50m
2026-07-22 SKW3996 CRW → ATL Jul 22, 11:20 UTCJul 22, 12:55 UTC1h 35m
2026-07-22 SKW4129 HPN → ATL Jul 22, 03:00 UTCJul 22, 04:55 UTC1h 55m
2026-07-21 SKW3526 YWG → MSP Jul 21, 21:10 UTCJul 21, 22:10 UTC1h 0m
2026-07-21 SKW192E IMT → DTW Jul 21, 18:40 UTCJul 21, 19:50 UTC1h 10m
2026-07-21 SKW3813 TWF → SLC Jul 21, 15:05 UTCJul 21, 17:40 UTC2h 35m
2026-07-21 SKW4015 - Jul 21, 11:40 UTCJul 21, 13:40 UTC2h 0m
2026-07-21 SKW3731 SEA → SJC Jul 21, 00:50 UTCJul 21, 03:10 UTC2h 20m
2026-07-20 SKW4053 - Jul 20, 22:05 UTCJul 20, 23:00 UTC55m
2026-07-20 SKW4053 - Jul 20, 20:10 UTCJul 20, 20:55 UTC45m
2026-07-20 SKW3747 - Jul 20, 16:50 UTCJul 20, 18:50 UTC2h 0m
2026-07-20 SKW3747 AUS → PHX Jul 20, 13:45 UTCJul 20, 15:45 UTC2h 0m
2026-07-20 SKW3669 DEN → AUS Jul 20, 01:55 UTCJul 20, 03:45 UTC1h 50m
2026-07-19 SKW3669 AUS → DEN Jul 19, 22:10 UTCJul 19, 23:55 UTC1h 45m
2026-07-19 SKW3772 SFO → SEA Jul 19, 18:50 UTCJul 19, 20:50 UTC2h 0m

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 Jul 26, 22:40 UTC.
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, SKW4112, SKW3918, SKW4104.