Apparatus

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sensors Mode-S transponder

A25925

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N250SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A25925
Octal
50454445
Decimal
10,639,653
Country
US
Tail
N250SY
Type
E75L
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
642
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A25925.

Country allocation

The ICAO 24-bit address A25925 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
SKW3903 - 18 2026-07-06
SKW3841 - 13 2026-07-20
SKW4112 SkyWest Airlines 10 2026-07-23
SKW3902 - 10 2026-07-12
SKW4099 - 9 2026-07-12
SKW4119 - 8 2026-07-13
SKW3759 - 8 2026-07-05
SKW3745 SkyWest Airlines 8 2026-07-23
SKW4126 SkyWest Airlines 7 2026-06-07
SKW3894 - 7 2026-07-03
SKW4026 - 6 2026-06-25
SKW3960 - 6 2026-06-19
SKW3908 SkyWest Airlines 6 2026-07-25
SKW3883 - 6 2026-07-12
SKW3846 - 6 2026-07-20
SKW3827 - 6 2026-07-13
SKW3776 SkyWest Airlines 6 2026-05-06
SKW3767 - 6 2026-06-17
SKW3762 SkyWest Airlines 6 2026-05-31
SKW3694 SkyWest Airlines 6 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3820 SLC → OAK Jul 26, 20:25 UTCJul 26, 21:15 UTC50m
2026-07-26 SKW3681 JFK → BNA Jul 26, 17:00 UTCJul 26, 17:15 UTC15m
2026-07-26 SKW3681 JFK → BNA Jul 26, 17:06 UTCJul 26, 18:17 UTC1h 11m
2026-07-26 SKW3681 JFK → BNA Jul 26, 14:30 UTCJul 26, 16:05 UTC1h 35m
2026-07-26 SKW3732 PHL → DTW Jul 26, 01:30 UTCJul 26, 02:30 UTC1h 0m
2026-07-25 SKW3732 PHL → DTW Jul 25, 23:25 UTCJul 25, 23:55 UTC30m
2026-07-25 SKW3908 ATL → CRW Jul 25, 20:10 UTCJul 25, 22:25 UTC2h 15m
2026-07-25 SKW3908 ATL → CRW Jul 25, 20:13 UTCJul 25, 22:24 UTC2h 11m
2026-07-25 SKW4177 AUS → MFE Jul 25, 18:00 UTCJul 25, 18:55 UTC55m
2026-07-25 SKW4177 AUS → MFE Jul 25, 15:55 UTCJul 25, 16:35 UTC40m
2026-07-25 SKW3950 JFK → IAD Jul 25, 12:50 UTCJul 25, 14:55 UTC2h 5m
2026-07-25 SKW3930 SJC → LAX Jul 25, 11:20 UTCJul 25, 11:50 UTC30m
2026-07-25 SKW3907 MDW → MSP Jul 25, 03:11 UTCJul 25, 03:22 UTC11m
2026-07-25 SKW3907 MDW → MSP Jul 25, 02:55 UTCJul 25, 03:15 UTC20m
2026-07-25 SKW4063 SLC → OAK Jul 25, 00:05 UTCJul 25, 01:55 UTC1h 50m
2026-07-24 SKW4063 SLC → OAK Jul 24, 21:10 UTCJul 24, 22:45 UTC1h 35m
2026-07-24 SKW3848 SLC → MFR Jul 24, 19:05 UTCJul 24, 20:00 UTC55m
2026-07-24 SKW3848 SLC → MFR Jul 24, 19:03 UTCJul 24, 19:47 UTC44m
2026-07-24 SKW4114 ALB → DTW Jul 24, 15:55 UTCJul 24, 17:50 UTC1h 55m
2026-07-24 SKW4004 ATL → SBN Jul 24, 12:25 UTCJul 24, 13:45 UTC1h 20m
2026-07-24 SKW3756 HPN → DTW Jul 24, 05:50 UTCJul 24, 07:10 UTC1h 20m
2026-07-24 SKW3756 HPN → DTW Jul 24, 05:52 UTCJul 24, 07:06 UTC1h 14m
2026-07-24 SKW4009 SEA → SFO Jul 24, 03:10 UTCJul 24, 04:55 UTC1h 45m
2026-07-23 SKW3585 JFK → ORD Jul 23, 22:40 UTCJul 24, 00:30 UTC1h 50m
2026-07-23 SKW4112 JFK → ORD Jul 23, 19:59 UTCJul 23, 21:04 UTC1h 5m
2026-07-23 SKW4112 JFK → ORD Jul 23, 17:30 UTCJul 23, 21:10 UTC3h 40m
2026-07-23 SKW3745 TUS → SLC Jul 23, 14:35 UTCJul 23, 16:05 UTC1h 30m
2026-07-23 SKW4054 SLC → OAK Jul 23, 02:50 UTCJul 23, 04:20 UTC1h 30m
2026-07-22 SKW3896 OMA → SLC Jul 22, 22:55 UTCJul 23, 01:00 UTC2h 5m
2026-07-22 SKW3896 OMA → SLC Jul 22, 19:50 UTCJul 22, 21:45 UTC1h 55m
2026-07-22 SKW3681 JFK → BNA Jul 22, 17:05 UTCJul 22, 18:30 UTC1h 25m
2026-07-22 SKW3681 JFK → BNA Jul 22, 14:15 UTCJul 22, 15:50 UTC1h 35m
2026-07-22 SKW3828 SLC → BIL Jul 22, 00:45 UTCJul 22, 02:00 UTC1h 15m
2026-07-21 SKW3828 SLC → BIL Jul 21, 22:40 UTCJul 21, 23:50 UTC1h 10m
2026-07-21 SKW4112 - Jul 21, 20:10 UTCJul 21, 20:50 UTC40m
2026-07-21 SKW4112 MSO → SLC Jul 21, 19:32 UTCJul 21, 20:40 UTC1h 8m
2026-07-21 SKW4112 - Jul 21, 17:10 UTCJul 21, 17:35 UTC25m
2026-07-21 SKW3796 SFO → SEA Jul 21, 13:00 UTCJul 21, 15:15 UTC2h 15m
2026-07-20 SKW3620 SLC → XNA Jul 20, 23:45 UTCJul 21, 02:10 UTC2h 25m
2026-07-20 SKW3841 SBA → SLC Jul 20, 19:50 UTCJul 20, 21:20 UTC1h 30m
2026-07-20 SKW3841 SLC → SBA Jul 20, 17:05 UTCJul 20, 18:40 UTC1h 35m
2026-07-20 SKW3745 - Jul 20, 14:10 UTCJul 20, 15:45 UTC1h 35m
2026-07-20 SKW3846 - Jul 20, 02:25 UTCJul 20, 03:40 UTC1h 15m
2026-07-19 SKW3822 SJC → LAX Jul 19, 23:35 UTCJul 20, 00:35 UTC1h 0m
2026-07-19 SKW3822 SJC → LAX Jul 19, 23:40 UTCJul 20, 00:23 UTC43m
2026-07-19 SKW3822 - Jul 19, 21:45 UTCJul 19, 22:30 UTC45m
2026-07-19 SKW3951 - Jul 19, 19:30 UTCJul 19, 20:25 UTC55m
2026-07-19 SKW3951 - Jul 19, 17:15 UTCJul 19, 18:20 UTC1h 5m
2026-07-19 SKW3696 BWI → BOS Jul 19, 13:40 UTCJul 19, 16:10 UTC2h 30m
2026-07-19 SKW3576 - Jul 19, 04:35 UTCJul 19, 06:35 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 N250SY page for operator, model, and routing details .

Mode-S A25925 frequently asked

What is Mode-S code A25925?
A25925 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N250SY.
Where is Mode-S A25925 registered?
Mode-S code A25925 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 A25925 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A25925, octal 50454445, decimal 10,639,653.
What flights does A25925 operate?
Mode-S A25925 has broadcast 20 distinct callsigns, including SKW3903, SKW3841, SKW4112, SKW3902, SKW4099.