Apparatus

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sensors Mode-S transponder

A83953

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N629SY · operated by SKYWEST AIRLINES INC

Hex
A83953
Octal
52034523
Decimal
11,024,723
Country
US
Tail
N629SY
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
651
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A83953.

Country allocation

The ICAO 24-bit address A83953 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
SKW5781 - 12 2026-07-20
SKW5493 SkyWest Airlines 11 2026-06-03
SKW4700 - 10 2026-07-19
SKW5766 - 9 2026-07-12
SKW5642 - 9 2026-07-07
SKW5635 SkyWest Airlines 9 2026-04-23
SKW5520 SkyWest Airlines 9 2026-07-23
SKW5914 SkyWest Airlines 8 2026-07-25
SKW5697 - 8 2026-07-19
SKW5529 SkyWest Airlines 8 2026-07-23
SKW5453 SkyWest Airlines 8 2026-04-24
SKW5211 - 8 2026-07-12
SKW4687 - 8 2026-07-21
SKW5779 - 7 2026-07-12
SKW5778 - 7 2026-07-12
SKW4756 - 7 2026-07-09
SKW5774 SkyWest Airlines 6 2026-07-22
SKW5769 - 6 2026-07-21
SKW5652 - 6 2026-07-18
SKW5641 - 6 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5787 FAT → DEN Jul 26, 20:25 UTCJul 26, 22:15 UTC1h 50m
2026-07-26 SKW450H ORD → MCI Jul 26, 18:45 UTCJul 26, 19:15 UTC30m
2026-07-26 SKW445W ORD → FNT Jul 26, 16:10 UTCJul 26, 17:40 UTC1h 30m
2026-07-26 SKW435T BOI → SFO Jul 26, 13:45 UTCJul 26, 14:00 UTC15m
2026-07-26 SKW5969 SFO → SEA Jul 26, 11:10 UTCJul 26, 12:40 UTC1h 30m
2026-07-26 SKW5269 DEN → SJC Jul 26, 03:15 UTCJul 26, 04:35 UTC1h 20m
2026-07-25 SKW5914 LNK → ORD Jul 25, 23:00 UTCJul 26, 00:20 UTC1h 20m
2026-07-25 SKW5914 LNK → ORD Jul 25, 22:25 UTCJul 26, 00:40 UTC2h 15m
2026-07-25 SKW5311 ORD → DCA Jul 25, 20:15 UTCJul 25, 21:30 UTC1h 15m
2026-07-25 SKW5787 FAT → DEN Jul 25, 16:20 UTCJul 25, 18:15 UTC1h 55m
2026-07-25 SKW5787 FAT → DEN Jul 25, 16:18 UTCJul 25, 18:07 UTC1h 49m
2026-07-25 SKW5329 ACV → LAX Jul 25, 04:50 UTCJul 25, 05:25 UTC35m
2026-07-25 SKW5940 ORD → MCI Jul 25, 01:30 UTCJul 25, 03:10 UTC1h 40m
2026-07-24 SKW5775 DEN → ASE Jul 24, 23:45 UTCJul 25, 00:10 UTC25m
2026-07-24 SKW5268 SUN → DEN Jul 24, 21:00 UTCJul 24, 22:15 UTC1h 15m
2026-07-24 SKW5268 SUN → DEN Jul 24, 20:53 UTCJul 24, 22:12 UTC1h 19m
2026-07-24 SKW717C DEN → SUN Jul 24, 18:05 UTCJul 24, 19:20 UTC1h 15m
2026-07-24 SKW5455 - Jul 24, 14:00 UTCJul 24, 16:10 UTC2h 10m
2026-07-24 SKW5455 PIA → DEN Jul 24, 14:08 UTCJul 24, 15:58 UTC1h 50m
2026-07-24 SKW5600 RNO → SFO Jul 24, 00:45 UTCJul 24, 02:20 UTC1h 35m
2026-07-23 SKW5911 DEN → ACV Jul 23, 22:25 UTCJul 23, 22:55 UTC30m
2026-07-23 SKW5388 DEN → HLN Jul 23, 19:00 UTCJul 23, 19:40 UTC40m
2026-07-23 SKW5520 OKC → IAH Jul 23, 15:55 UTCJul 23, 17:45 UTC1h 50m
2026-07-23 SKW5520 OKC → IAH Jul 23, 15:52 UTCJul 23, 17:37 UTC1h 45m
2026-07-23 SKW5529 LAX → RDD Jul 23, 02:45 UTCJul 23, 04:45 UTC2h 0m
2026-07-22 SKW5694 GRB → ORD Jul 22, 23:15 UTCJul 23, 00:55 UTC1h 40m
2026-07-22 SKW5694 GRB → ORD Jul 22, 22:58 UTCJul 23, 01:06 UTC2h 8m
2026-07-22 SKW5641 DEN → XNA Jul 22, 19:45 UTCJul 22, 21:10 UTC1h 25m
2026-07-22 SKW5641 DEN → XNA Jul 22, 19:50 UTCJul 22, 21:07 UTC1h 17m
2026-07-22 SKW5834 - Jul 22, 17:15 UTCJul 22, 18:20 UTC1h 5m
2026-07-22 SKW5834 ABQ → DEN Jul 22, 16:58 UTCJul 22, 18:21 UTC1h 23m
2026-07-22 SKW5487 DEN → ABQ Jul 22, 14:25 UTCJul 22, 15:20 UTC55m
2026-07-22 SKW5701 FSD → DEN Jul 22, 11:10 UTCJul 22, 12:35 UTC1h 25m
2026-07-22 SKW309L DEN → FSD Jul 22, 03:25 UTCJul 22, 04:30 UTC1h 5m
2026-07-22 SKW5774 ASE → DEN Jul 22, 01:15 UTCJul 22, 01:40 UTC25m
2026-07-22 SKW5774 ASE → DEN Jul 22, 01:09 UTCJul 22, 01:37 UTC28m
2026-07-21 SKW5769 - Jul 21, 17:55 UTCJul 21, 18:10 UTC15m
2026-07-21 SKW5769 DEN → ASE Jul 21, 17:42 UTCJul 21, 18:21 UTC39m
2026-07-21 SKW4687 - Jul 21, 15:00 UTCJul 21, 15:25 UTC25m
2026-07-20 SKW5711 PHL → ORD Jul 20, 23:50 UTCJul 21, 01:35 UTC1h 45m
2026-07-20 SKW5711 PHL → ORD Jul 20, 23:50 UTCJul 21, 02:13 UTC2h 23m
2026-07-20 SKW4655 - Jul 20, 21:35 UTCJul 20, 22:20 UTC45m
2026-07-20 SKW5506 SFO → ASE Jul 20, 17:45 UTCJul 20, 19:55 UTC2h 10m
2026-07-20 SKW4687 - Jul 20, 14:55 UTCJul 20, 15:20 UTC25m
2026-07-20 SKW4687 ASE → DEN Jul 20, 14:58 UTCJul 20, 15:20 UTC22m
2026-07-20 SKW5781 - Jul 20, 03:00 UTCJul 20, 03:20 UTC20m
2026-07-20 SKW5781 DEN → ASE Jul 20, 02:54 UTCJul 20, 03:24 UTC30m
2026-07-20 SKW6011 ASE → DEN Jul 20, 00:36 UTCJul 20, 01:05 UTC29m
2026-07-19 SKW5697 - Jul 19, 22:55 UTCJul 19, 23:15 UTC20m
2026-07-19 SKW5607 TVC → DEN Jul 19, 21:10 UTCJul 19, 21:35 UTC25m

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 N629SY page for operator, model, and routing details .

Mode-S A83953 frequently asked

What is Mode-S code A83953?
A83953 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N629SY.
Where is Mode-S A83953 registered?
Mode-S code A83953 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 A83953 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A83953, octal 52034523, decimal 11,024,723.
What flights does A83953 operate?
Mode-S A83953 has broadcast 20 distinct callsigns, including SKW5781, SKW5493, SKW4700, SKW5766, SKW5642.