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sensors Mode-S transponder

A2845B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N261SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2845B
Octal
50502133
Decimal
10,650,715
Country
US
Tail
N261SY
Type
E75L
No current signal · last broadcast 1h ago
Flights observed
637
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A2845B.

Country allocation

The ICAO 24-bit address A2845B 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
SKW3759 - 14 2026-06-13
SKW3842 - 13 2026-07-04
SKW3822 SkyWest Airlines 13 2026-06-12
SKW3951 SkyWest Airlines 12 2026-06-12
SKW4119 SkyWest Airlines 9 2026-06-13
SKW3950 SkyWest Airlines 8 2026-05-03
SKW3779 - 8 2026-07-11
SKW3754 - 8 2026-07-10
SKW4141 - 7 2026-06-28
SKW4127 - 7 2026-07-10
SKW4087 - 7 2026-07-05
SKW3792 SkyWest Airlines 7 2026-04-26
SKW4124 - 6 2026-07-06
SKW4092 - 6 2026-07-11
SKW4067 - 6 2026-07-14
SKW3902 SkyWest Airlines 6 2026-06-13
SKW3876 - 6 2026-06-24
SKW3824 - 6 2026-07-02
SKW3773 - 6 2026-06-27
SKW3712 - 6 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 SKW182J - Jul 17, 20:25 UTCJul 17, 20:44 UTC20m
2026-07-17 SKW3771 FAR → MSP Jul 17, 18:29 UTCJul 17, 19:15 UTC45m
2026-07-17 SKW3771 MSP → FAR Jul 17, 16:36 UTCJul 17, 17:04 UTC28m
2026-07-17 SKW3844 OKC → MSP Jul 17, 13:05 UTCJul 17, 14:44 UTC1h 40m
2026-07-16 SKW3791 MSP → OKC Jul 16, 23:29 UTCJul 17, 01:15 UTC1h 45m
2026-07-16 SKW3699 IAD → MSP Jul 16, 15:55 UTCJul 16, 18:10 UTC2h 15m
2026-07-16 SKW3699 MSP → IAD Jul 16, 13:00 UTCJul 16, 14:55 UTC1h 55m
2026-07-16 SKW3930 - Jul 16, 10:15 UTCJul 16, 10:40 UTC25m
2026-07-16 SKW3930 DLH → MSP Jul 16, 10:21 UTCJul 16, 10:39 UTC18m
2026-07-16 SKW3907 - Jul 16, 03:00 UTCJul 16, 03:30 UTC30m
2026-07-15 SKW4063 - Jul 15, 23:50 UTCJul 16, 01:25 UTC1h 35m
2026-07-15 SKW4063 - Jul 15, 20:50 UTCJul 15, 22:45 UTC1h 55m
2026-07-15 SKW3848 - Jul 15, 18:55 UTCJul 15, 19:40 UTC45m
2026-07-15 SKW3848 OMA → MSP Jul 15, 18:57 UTCJul 15, 19:35 UTC38m
2026-07-15 SKW4114 - Jul 15, 15:50 UTCJul 15, 17:50 UTC2h 0m
2026-07-14 SKW3908 AUS → SLC Jul 14, 20:00 UTCJul 14, 22:30 UTC2h 30m
2026-07-14 SKW3960 BNA → AUS Jul 14, 16:35 UTCJul 14, 18:50 UTC2h 15m
2026-07-14 SKW3960 AUS → BNA Jul 14, 14:00 UTCJul 14, 15:55 UTC1h 55m
2026-07-14 SKW4175 - Jul 14, 10:30 UTCJul 14, 11:20 UTC50m
2026-07-14 SKW4067 - Jul 14, 04:15 UTCJul 14, 05:00 UTC45m
2026-07-14 SKW4067 AUS → MFE Jul 14, 04:20 UTCJul 14, 05:08 UTC48m
2026-07-14 SKW4027 IND → AUS Jul 14, 00:10 UTCJul 14, 02:15 UTC2h 5m
2026-07-13 SKW4027 AUS → IND Jul 13, 21:05 UTCJul 13, 23:25 UTC2h 20m
2026-07-13 SKW4101 - Jul 13, 15:55 UTCJul 13, 18:20 UTC2h 25m
2026-07-13 SKW4101 AUS → IND Jul 13, 12:25 UTCJul 13, 14:35 UTC2h 10m
2026-07-13 SKW4175 MFE → AUS Jul 13, 10:34 UTCJul 13, 11:24 UTC50m
2026-07-13 SKW4067 - Jul 13, 04:55 UTCJul 13, 05:40 UTC45m
2026-07-13 SKW4067 AUS → MFE Jul 13, 04:50 UTCJul 13, 05:42 UTC52m
2026-07-13 SKW3945 BNA → AUS Jul 13, 00:25 UTCJul 13, 02:20 UTC1h 55m
2026-07-12 SKW3945 AUS → BNA Jul 12, 21:10 UTCJul 12, 23:10 UTC2h 0m
2026-07-12 SKW3955 - Jul 12, 17:01 UTCJul 12, 19:30 UTC2h 30m
2026-07-12 SKW3874 - Jul 12, 13:25 UTCJul 12, 15:40 UTC2h 15m
2026-07-11 SKW3706 - Jul 11, 23:20 UTCJul 12, 01:15 UTC1h 55m
2026-07-11 SKW3801 MFR → SLC Jul 11, 20:50 UTCJul 11, 22:15 UTC1h 25m
2026-07-11 SKW3779 SEA → MFR Jul 11, 18:32 UTCJul 11, 19:40 UTC1h 8m
2026-07-11 SKW3779 - Jul 11, 18:35 UTCJul 11, 18:45 UTC10m
2026-07-11 SKW4092 - Jul 11, 03:25 UTCJul 11, 16:05 UTC12h 40m
2026-07-11 SKW3857 GEG → SEA Jul 11, 00:50 UTCJul 11, 01:45 UTC55m
2026-07-10 SKW3857 - Jul 10, 22:55 UTCJul 10, 23:40 UTC45m
2026-07-10 SKW3754 GEG → SEA Jul 10, 20:15 UTCJul 10, 20:55 UTC40m
2026-07-10 SKW3754 SEA → GEG Jul 10, 18:10 UTCJul 10, 18:50 UTC40m
2026-07-10 SKW3695 - Jul 10, 14:20 UTCJul 10, 16:55 UTC2h 35m
2026-07-10 SKW3932 SEA → SNA Jul 10, 02:50 UTCJul 10, 05:10 UTC2h 20m
2026-07-10 SKW4127 - Jul 10, 00:15 UTCJul 10, 01:25 UTC1h 10m
2026-07-09 SKW4127 - Jul 9, 22:05 UTCJul 9, 23:00 UTC55m
2026-07-09 SKW3992 - Jul 9, 19:50 UTCJul 9, 20:25 UTC35m
2026-07-09 SKW3992 - Jul 9, 18:10 UTCJul 9, 18:35 UTC25m
2026-07-09 SKW4092 SEA → SEA Jul 9, 04:30 UTCJul 9, 16:25 UTC11h 55m
2026-07-09 SKW3999 - Jul 9, 00:55 UTCJul 9, 03:30 UTC2h 35m
2026-07-08 SKW3999 - Jul 8, 21:40 UTCJul 9, 00:00 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 N261SY page for operator, model, and routing details .

Mode-S A2845B frequently asked

What is Mode-S code A2845B?
A2845B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N261SY.
Where is Mode-S A2845B registered?
Mode-S code A2845B 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 A2845B 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 A2845B, octal 50502133, decimal 10,650,715.
What flights does A2845B operate?
Mode-S A2845B has broadcast 20 distinct callsigns, including SKW3759, SKW3842, SKW3822, SKW3951, SKW4119.