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 54m ago
Flights observed
560
Distinct callsigns
20
Country
US
Last broadcast
54m ago

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 - 11 2026-06-26
SKW3902 - 10 2026-07-12
SKW4099 - 9 2026-07-12
SKW4119 - 8 2026-07-13
SKW3759 - 8 2026-07-05
SKW4126 SkyWest Airlines 7 2026-06-07
SKW3894 - 7 2026-07-03
SKW4026 - 6 2026-06-25
SKW3960 - 6 2026-06-19
SKW3883 - 6 2026-07-12
SKW3827 - 6 2026-07-13
SKW3776 SkyWest Airlines 6 2026-05-06
SKW3767 - 6 2026-06-17
SKW3762 SkyWest Airlines 6 2026-05-31
SKW3745 - 6 2026-07-07
SKW3694 SkyWest Airlines 6 2026-05-05
SKW3501 SkyWest Airlines 6 2026-05-20
SKW197F SkyWest Airlines 6 2026-05-20
SKW157E SkyWest Airlines 6 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW4148 - Jul 14, 03:05 UTCJul 14, 03:15 UTC10m
2026-07-13 SKW3799 GEG → LAX Jul 13, 23:35 UTCJul 14, 02:05 UTC2h 30m
2026-07-13 SKW3794 - Jul 13, 20:10 UTCJul 13, 22:05 UTC1h 55m
2026-07-13 SKW4119 - Jul 13, 17:55 UTCJul 13, 18:45 UTC50m
2026-07-13 SKW4119 - Jul 13, 15:35 UTCJul 13, 16:35 UTC1h 0m
2026-07-13 SKW4057 - Jul 13, 13:10 UTCJul 13, 14:05 UTC55m
2026-07-13 SKW3827 - Jul 13, 05:45 UTCJul 13, 07:01 UTC1h 15m
2026-07-13 SKW4077 - Jul 13, 03:40 UTCJul 13, 04:30 UTC50m
2026-07-13 SKW4077 - Jul 13, 01:01 UTCJul 13, 01:55 UTC55m
2026-07-12 SKW3902 - Jul 12, 22:20 UTCJul 12, 23:25 UTC1h 5m
2026-07-12 SKW3902 - Jul 12, 20:05 UTCJul 12, 21:00 UTC55m
2026-07-12 SKW4099 - Jul 12, 17:45 UTCJul 12, 18:55 UTC1h 10m
2026-07-12 SKW4099 - Jul 12, 15:25 UTCJul 12, 16:20 UTC55m
2026-07-12 SKW3743 - Jul 12, 13:35 UTCJul 12, 14:01 UTC25m
2026-07-12 SKW3746 - Jul 12, 06:01 UTCJul 12, 06:25 UTC25m
2026-07-12 SKW3883 SJC → LAX Jul 12, 03:50 UTCJul 12, 04:50 UTC1h 0m
2026-07-12 SKW3883 - Jul 12, 01:25 UTCJul 12, 02:10 UTC45m
2026-07-11 SKW3902 - Jul 11, 23:25 UTCJul 12, 00:30 UTC1h 5m
2026-07-11 SKW3902 - Jul 11, 20:10 UTCJul 11, 21:00 UTC50m
2026-07-11 SKW4099 - Jul 11, 17:50 UTCJul 11, 19:00 UTC1h 10m
2026-07-11 SKW4099 - Jul 11, 15:35 UTCJul 11, 16:30 UTC55m
2026-07-11 SKW4057 PHX → LAX Jul 11, 13:15 UTCJul 11, 14:15 UTC1h 0m
2026-07-11 SKW3827 - Jul 11, 06:20 UTCJul 11, 07:25 UTC1h 5m
2026-07-11 SKW4077 PHX → LAX Jul 11, 03:35 UTCJul 11, 04:55 UTC1h 20m
2026-07-11 SKW4077 - Jul 11, 00:50 UTCJul 11, 01:55 UTC1h 5m
2026-07-10 SKW3902 - Jul 10, 22:45 UTCJul 10, 23:45 UTC1h 0m
2026-07-10 SKW3902 - Jul 10, 20:05 UTCJul 10, 20:55 UTC50m
2026-07-10 SKW4119 - Jul 10, 18:00 UTCJul 10, 18:55 UTC55m
2026-07-10 SKW4119 LAX → PHX Jul 10, 15:35 UTCJul 10, 16:35 UTC1h 0m
2026-07-10 SKW3743 - Jul 10, 13:40 UTCJul 10, 14:05 UTC25m
2026-07-10 SKW3746 - Jul 10, 05:55 UTCJul 10, 06:25 UTC30m
2026-07-10 SKW3883 SJC → LAX Jul 10, 03:45 UTCJul 10, 04:50 UTC1h 5m
2026-07-10 SKW3883 - Jul 10, 01:25 UTCJul 10, 02:15 UTC50m
2026-07-09 SKW3701 - Jul 9, 22:10 UTCJul 9, 23:55 UTC1h 45m
2026-07-09 SKW3701 BOI → LAX Jul 9, 22:10 UTCJul 9, 23:55 UTC1h 45m
2026-07-09 SKW3959 - Jul 9, 19:45 UTCJul 9, 20:40 UTC55m
2026-07-09 SKW3750 - Jul 9, 16:55 UTCJul 9, 18:00 UTC1h 5m
2026-07-09 SKW3750 - Jul 9, 14:35 UTCJul 9, 15:35 UTC1h 0m
2026-07-09 SKW4125 SMF → SEA Jul 9, 03:45 UTCJul 9, 05:20 UTC1h 35m
2026-07-09 SKW4125 SMF → SEA Jul 9, 03:40 UTCJul 9, 05:16 UTC1h 36m
2026-07-08 SKW4125 SEA → SMF Jul 8, 17:45 UTCJul 8, 19:15 UTC1h 30m
2026-07-08 SKW4092 SEA → SEA Jul 8, 03:35 UTCJul 8, 16:10 UTC12h 35m
2026-07-08 SKW3857 GEG → SEA Jul 8, 00:57 UTCJul 8, 01:35 UTC38m
2026-07-08 SKW3857 GEG → SEA Jul 8, 00:50 UTCJul 8, 01:40 UTC50m
2026-07-07 SKW3857 SEA → GEG Jul 7, 23:00 UTCJul 7, 23:40 UTC40m
2026-07-07 SKW3878 - Jul 7, 20:05 UTCJul 7, 21:05 UTC1h 0m
2026-07-07 SKW3806 SLC → MFR Jul 7, 17:40 UTCJul 7, 19:20 UTC1h 40m
2026-07-07 SKW3745 - Jul 7, 14:05 UTCJul 7, 15:35 UTC1h 30m
2026-07-07 SKW3745 TUS → SLC Jul 7, 14:13 UTCJul 7, 15:30 UTC1h 17m
2026-07-07 SKW4054 SLC → TUS Jul 7, 02:45 UTCJul 7, 04:20 UTC1h 35m

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 54m ago.
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, SKW3902, SKW4099, SKW4119.