Apparatus

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sensors Mode-S transponder

A31890

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N299SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A31890
Octal
50614220
Decimal
10,688,656
Country
US
Tail
N299SY
Type
E75L
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
658
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S A31890.

Country allocation

The ICAO 24-bit address A31890 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
SKW4097 - 60 2026-07-20
SKW3805 SkyWest Airlines 44 2026-07-25
SKW4033 SkyWest Airlines 40 2026-07-23
SKW4111 SkyWest Airlines 24 2026-06-28
SKW3760 SkyWest Airlines 23 2026-07-23
SKW4107 - 18 2026-07-09
SKW3507 SkyWest Airlines 18 2026-07-26
SKW3505 SkyWest Airlines 17 2026-07-22
SKW3504 SkyWest Airlines 17 2026-07-23
SKW4109 - 15 2026-07-09
SKW3758 - 15 2026-07-14
SKW3723 SkyWest Airlines 15 2026-07-21
SKW4448 SkyWest Airlines 14 2026-07-26
SKW4117 SkyWest Airlines 11 2026-07-26
SKW3939 SkyWest Airlines 11 2026-07-25
SKW3761 SkyWest Airlines 11 2026-06-02
SKW4095 SkyWest Airlines 10 2026-07-26
SKW4031 SkyWest Airlines 10 2026-04-18
SKW4118 SkyWest Airlines 9 2026-07-24
SKW4064 SkyWest Airlines 9 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4448 SLC → SJC Jul 26, 20:55 UTCJul 26, 21:55 UTC1h 0m
2026-07-26 SKW3507 BOS → MKE Jul 26, 18:20 UTCJul 26, 19:30 UTC1h 10m
2026-07-26 SKW3507 BOS → MKE Jul 26, 15:50 UTCJul 26, 17:05 UTC1h 15m
2026-07-26 SKW4117 HPN → ATL Jul 26, 13:05 UTCJul 26, 14:35 UTC1h 30m
2026-07-26 SKW4095 ATL → FWA Jul 26, 01:50 UTCJul 26, 03:05 UTC1h 15m
2026-07-25 SKW3805 MDT → ATL Jul 25, 22:10 UTCJul 25, 23:15 UTC1h 5m
2026-07-25 SKW3805 MDT → ATL Jul 25, 20:00 UTCJul 25, 20:55 UTC55m
2026-07-25 SKW3507 BOS → MKE Jul 25, 17:20 UTCJul 25, 18:35 UTC1h 15m
2026-07-25 SKW3507 BOS → MKE Jul 25, 14:40 UTCJul 25, 15:55 UTC1h 15m
2026-07-25 SKW3939 ABY → ATL Jul 25, 04:15 UTCJul 25, 05:25 UTC1h 10m
2026-07-25 SKW4448 SLC → SJC Jul 25, 02:10 UTCJul 25, 03:15 UTC1h 5m
2026-07-24 SKW4448 SLC → SJC Jul 24, 22:45 UTCJul 24, 23:40 UTC55m
2026-07-24 SKW3863 MOT → MSP Jul 24, 19:20 UTCJul 24, 20:45 UTC1h 25m
2026-07-24 SKW4064 DTW → MSN Jul 24, 15:30 UTCJul 24, 16:55 UTC1h 25m
2026-07-24 SKW3946 ORD → JFK Jul 24, 11:15 UTCJul 24, 13:40 UTC2h 25m
2026-07-24 SKW4118 OKC → LGA Jul 24, 00:10 UTCJul 24, 02:45 UTC2h 35m
2026-07-23 SKW4033 HPN → ATL Jul 23, 21:35 UTCJul 23, 23:00 UTC1h 25m
2026-07-23 SKW4033 HPN → ATL Jul 23, 18:35 UTCJul 23, 20:00 UTC1h 25m
2026-07-23 SKW3760 MSN → MSP Jul 23, 16:30 UTCJul 23, 17:30 UTC1h 0m
2026-07-23 SKW3760 MSN → MSP Jul 23, 13:55 UTCJul 23, 15:00 UTC1h 5m
2026-07-23 SKW3504 MSN → MSP Jul 23, 11:20 UTCJul 23, 12:45 UTC1h 25m
2026-07-23 SKW3504 MSN → MSP Jul 23, 11:20 UTCJul 23, 12:36 UTC1h 16m
2026-07-22 SKW3505 DTW → OMA Jul 22, 23:15 UTCJul 23, 00:35 UTC1h 20m
2026-07-22 SKW3505 DTW → OMA Jul 22, 23:14 UTCJul 23, 00:32 UTC1h 18m
2026-07-22 SKW3805 MDT → ATL Jul 22, 21:05 UTCJul 22, 22:05 UTC1h 0m
2026-07-22 SKW3805 MDT → ATL Jul 22, 18:45 UTCJul 22, 19:40 UTC55m
2026-07-22 SKW3760 MSN → MSP Jul 22, 16:15 UTCJul 22, 17:15 UTC1h 0m
2026-07-22 SKW3760 MSN → MSP Jul 22, 13:50 UTCJul 22, 14:50 UTC1h 0m
2026-07-22 SKW3905 - Jul 22, 11:10 UTCJul 22, 12:35 UTC1h 25m
2026-07-22 SKW4441 ATL → XNA Jul 22, 03:00 UTCJul 22, 04:25 UTC1h 25m
2026-07-21 SKW3579 - Jul 21, 23:45 UTCJul 22, 00:10 UTC25m
2026-07-21 SKW3579 ATL → CHA Jul 21, 22:00 UTCJul 21, 22:25 UTC25m
2026-07-21 SKW3723 BNA → BOS Jul 21, 18:35 UTCJul 21, 20:15 UTC1h 40m
2026-07-21 SKW3730 MSP → MSN Jul 21, 15:15 UTCJul 21, 16:45 UTC1h 30m
2026-07-21 SKW3946 - Jul 21, 11:20 UTCJul 21, 13:35 UTC2h 15m
2026-07-21 SKW4118 OKC → LGA Jul 21, 00:15 UTCJul 21, 03:15 UTC3h 0m
2026-07-20 SKW3805 MDT → ATL Jul 20, 21:00 UTCJul 20, 22:05 UTC1h 5m
2026-07-20 SKW3805 MDT → ATL Jul 20, 20:49 UTCJul 20, 22:00 UTC1h 11m
2026-07-20 SKW3805 MDT → ATL Jul 20, 18:40 UTCJul 20, 19:40 UTC1h 0m
2026-07-20 SKW4097 - Jul 20, 16:10 UTCJul 20, 17:30 UTC1h 20m
2026-07-20 SKW4097 SBN → ATL Jul 20, 16:10 UTCJul 20, 17:34 UTC1h 24m
2026-07-20 SKW4097 - Jul 20, 13:35 UTCJul 20, 15:05 UTC1h 30m
2026-07-20 SKW4448 - Jul 20, 02:35 UTCJul 20, 03:30 UTC55m
2026-07-20 SKW4448 ATL → FAY Jul 20, 00:05 UTCJul 20, 01:55 UTC1h 50m
2026-07-19 SKW3507 BOS → MKE Jul 19, 20:25 UTCJul 19, 21:55 UTC1h 30m
2026-07-19 SKW3507 BOS → MKE Jul 19, 18:08 UTCJul 19, 21:43 UTC3h 35m
2026-07-19 SKW3507 BOS → MKE Jul 19, 15:40 UTCJul 19, 17:00 UTC1h 20m
2026-07-19 SKW4117 - Jul 19, 12:55 UTCJul 19, 14:20 UTC1h 25m
2026-07-19 SKW4095 ATL → SHV Jul 19, 01:25 UTCJul 19, 02:40 UTC1h 15m
2026-07-18 SKW4097 - Jul 18, 19:35 UTCJul 18, 21:00 UTC1h 25m

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 N299SY page for operator, model, and routing details .

Mode-S A31890 frequently asked

What is Mode-S code A31890?
A31890 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N299SY.
Where is Mode-S A31890 registered?
Mode-S code A31890 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 A31890 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A31890, octal 50614220, decimal 10,688,656.
What flights does A31890 operate?
Mode-S A31890 has broadcast 20 distinct callsigns, including SKW4097, SKW3805, SKW4033, SKW4111, SKW3760.