Apparatus

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sensors Mode-S transponder

A10231

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N164SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A10231
Octal
50201061
Decimal
10,551,857
Country
US
Tail
N164SY
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
622
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A10231.

Country allocation

The ICAO 24-bit address A10231 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
SKW5788 - 7 2026-07-14
SKW5525 SkyWest Airlines 7 2026-07-21
SKW4802 - 7 2026-07-13
SKW5876 - 6 2026-06-20
SKW5544 - 6 2026-07-13
SKW5283 - 6 2026-07-10
SKW5238 - 6 2026-07-09
SKW4774 - 6 2026-07-15
SKW4712 - 6 2026-06-28
SKW5795 - 5 2026-07-14
SKW5683 - 5 2026-06-30
SKW5667 - 5 2026-06-28
SKW5642 - 5 2026-07-04
SKW5586 SkyWest Airlines 5 2026-07-25
SKW5511 SkyWest Airlines 5 2026-07-20
SKW5497 - 5 2026-07-03
SKW5332 SkyWest Airlines 5 2026-06-01
SKW5276 - 5 2026-07-14
SKW5260 SkyWest Airlines 5 2026-07-21
SKW6027 SkyWest Airlines 4 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4648 MBS → ORD Jul 26, 18:35 UTCJul 26, 21:15 UTC2h 40m
2026-07-26 SKW4746 ONT → SFO Jul 26, 14:40 UTCJul 26, 17:05 UTC2h 25m
2026-07-26 SKW5265 RDM → SFO Jul 26, 10:10 UTCJul 26, 11:15 UTC1h 5m
2026-07-26 SKW5265 RDM → SFO Jul 26, 10:23 UTCJul 26, 11:06 UTC43m
2026-07-25 SKW5638 SFO → SMF Jul 25, 21:10 UTCJul 25, 22:05 UTC55m
2026-07-25 SKW5928 MFR → SFO Jul 25, 18:45 UTCJul 25, 19:20 UTC35m
2026-07-25 SKW5586 SFO → ONT Jul 25, 16:25 UTCJul 25, 17:00 UTC35m
2026-07-25 SKW5586 SFO → ONT Jul 25, 16:18 UTCJul 25, 17:03 UTC45m
2026-07-25 SKW5364 OKC → ORD Jul 25, 12:20 UTCJul 25, 14:05 UTC1h 45m
2026-07-24 SKW5278 HPN → ORD Jul 24, 23:35 UTCJul 25, 00:40 UTC1h 5m
2026-07-24 SKW5278 HPN → ORD Jul 24, 23:34 UTCJul 25, 00:36 UTC1h 2m
2026-07-24 SKW5301 LNK → ORD Jul 24, 20:45 UTCJul 24, 22:05 UTC1h 20m
2026-07-24 SKW362T ORD → TUL Jul 24, 18:15 UTCJul 24, 19:45 UTC1h 30m
2026-07-24 SKW362T ORD → TUL Jul 24, 18:24 UTCJul 24, 19:44 UTC1h 20m
2026-07-24 SKW6021 TUL → DTW Jul 24, 01:40 UTCJul 24, 16:30 UTC14h 50m
2026-07-23 SKW5334 SFO → EUG Jul 23, 21:15 UTCJul 23, 23:10 UTC1h 55m
2026-07-23 SKW5449 ORD → HPN Jul 23, 17:45 UTCJul 23, 19:30 UTC1h 45m
2026-07-23 SKW5823 OKC → ORD Jul 23, 14:01 UTCJul 23, 15:26 UTC1h 25m
2026-07-23 SKW5823 OKC → ORD Jul 23, 13:55 UTCJul 23, 15:40 UTC1h 45m
2026-07-23 SKW5281 TUS → SFO Jul 23, 03:05 UTCJul 23, 04:00 UTC55m
2026-07-23 SKW5658 PHL → ORD Jul 23, 00:35 UTCJul 23, 01:15 UTC40m
2026-07-22 SKW5379 RNO → SFO Jul 22, 21:50 UTCJul 22, 22:25 UTC35m
2026-07-22 SKW5637 ORD → MDT Jul 22, 18:50 UTCJul 22, 20:05 UTC1h 15m
2026-07-22 SKW5315 ASE → ORD Jul 22, 16:20 UTCJul 22, 17:35 UTC1h 15m
2026-07-22 SKW4705 DEN → HLN Jul 22, 02:00 UTCJul 22, 14:00 UTC12h 0m
2026-07-21 SKW5260 SFO → SNA Jul 21, 22:34 UTCJul 22, 00:02 UTC1h 28m
2026-07-21 SKW5260 SFO → SNA Jul 21, 22:15 UTCJul 22, 00:05 UTC1h 50m
2026-07-21 SKW5765 SFO → BOI Jul 21, 19:50 UTCJul 21, 20:25 UTC35m
2026-07-21 SKW5525 DEN → MKE Jul 21, 17:05 UTCJul 21, 18:15 UTC1h 10m
2026-07-21 SKW5525 DEN → MKE Jul 21, 17:05 UTCJul 21, 18:17 UTC1h 12m
2026-07-21 SKW5593 DEN → SBP Jul 21, 15:00 UTCJul 21, 16:10 UTC1h 10m
2026-07-21 SKW5934 ORD → FCA Jul 21, 01:45 UTCJul 21, 03:00 UTC1h 15m
2026-07-20 SKW5591 LAX → FAT Jul 20, 22:45 UTCJul 20, 23:55 UTC1h 9m
2026-07-20 SKW5591 LAX → FAT Jul 20, 22:10 UTCJul 20, 23:49 UTC1h 39m
2026-07-20 SKW5511 SGF → DEN Jul 20, 18:35 UTCJul 20, 20:20 UTC1h 45m
2026-07-20 SKW5475 SFO → MFR Jul 20, 14:45 UTCJul 20, 16:35 UTC1h 50m
2026-07-20 SKW5475 SFO → MFR Jul 20, 14:53 UTCJul 20, 16:31 UTC1h 38m
2026-07-20 SKW5618 PDX → SFO Jul 20, 10:35 UTCJul 20, 11:25 UTC50m
2026-07-20 SKW5618 PDX → SFO Jul 20, 10:37 UTCJul 20, 11:18 UTC41m
2026-07-20 SKW5785 ORD → DTW Jul 20, 01:30 UTCJul 20, 02:15 UTC45m
2026-07-19 SKW5318 SLC → SFO Jul 19, 20:50 UTCJul 19, 23:45 UTC2h 55m
2026-07-19 SKW5651 SFO → ABQ Jul 19, 17:10 UTCJul 19, 19:20 UTC2h 10m
2026-07-19 SKW4664 - Jul 19, 13:05 UTCJul 19, 15:20 UTC2h 15m
2026-07-18 SKW4791 - Jul 18, 20:35 UTCJul 18, 22:15 UTC1h 40m
2026-07-18 SKW4680 GSP → ORD Jul 18, 14:45 UTCJul 18, 16:15 UTC1h 30m
2026-07-18 SKW4680 GSP → ORD Jul 18, 14:50 UTCJul 18, 16:02 UTC1h 12m
2026-07-18 SKW5216 SJC → DEN Jul 18, 11:45 UTCJul 18, 13:15 UTC1h 30m
2026-07-18 SKW5216 SJC → DEN Jul 18, 11:55 UTCJul 18, 13:22 UTC1h 27m
2026-07-18 SKW6012 ORD → COU Jul 18, 04:45 UTCJul 18, 06:45 UTC2h 0m
2026-07-18 SKW6012 ORD → COU Jul 18, 04:21 UTCJul 18, 06:42 UTC2h 21m

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 N164SY page for operator, model, and routing details .

Mode-S A10231 frequently asked

What is Mode-S code A10231?
A10231 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N164SY.
Where is Mode-S A10231 registered?
Mode-S code A10231 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 A10231 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A10231, octal 50201061, decimal 10,551,857.
What flights does A10231 operate?
Mode-S A10231 has broadcast 20 distinct callsigns, including SKW5788, SKW5525, SKW4802, SKW5876, SKW5544.