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sensors Mode-S transponder

A85964

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N637SY · operated by SKYWEST AIRLINES INC

Hex
A85964
Octal
52054544
Decimal
11,032,932
Country
US
Tail
N637SY
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
620
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S A85964.

Country allocation

The ICAO 24-bit address A85964 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
SKW5771 SkyWest Airlines 15 2026-07-18
SKW5956 SkyWest Airlines 13 2026-07-19
SKW5520 SkyWest Airlines 11 2026-07-25
SKW5441 SkyWest Airlines 11 2026-06-07
SKW5814 SkyWest Airlines 9 2026-07-19
SKW5779 SkyWest Airlines 9 2026-07-24
SKW5778 SkyWest Airlines 9 2026-07-24
SKW5776 SkyWest Airlines 9 2026-07-18
SKW5772 SkyWest Airlines 9 2026-07-24
SKW5553 SkyWest Airlines 9 2026-07-20
SKW5529 SkyWest Airlines 9 2026-07-25
SKW5444 SkyWest Airlines 9 2026-07-23
SKW5775 SkyWest Airlines 8 2026-07-26
SKW5343 SkyWest Airlines 8 2026-07-23
SKW5279 - 8 2026-07-20
SKW5780 SkyWest Airlines 7 2026-07-21
SKW5770 SkyWest Airlines 7 2026-07-23
SKW5749 SkyWest Airlines 7 2026-07-25
SKW5513 SkyWest Airlines 7 2026-05-20
SKW5493 - 7 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6046 SFO → STL Jul 26, 22:25 UTCJul 26, 23:00 UTC35m
2026-07-26 SKW455P SDF → PIA Jul 26, 19:15 UTCJul 26, 21:00 UTC1h 45m
2026-07-26 SKW5775 DEN → ASE Jul 26, 03:30 UTCJul 26, 03:40 UTC10m
2026-07-26 SKW5775 DEN → ASE Jul 26, 00:10 UTCJul 26, 01:20 UTC1h 10m
2026-07-25 SKW5749 PIT → ORD Jul 25, 22:05 UTCJul 25, 22:35 UTC30m
2026-07-25 SKW736T DEN → GUC Jul 25, 19:40 UTCJul 25, 20:05 UTC25m
2026-07-25 SKW5520 OKC → IAH Jul 25, 16:00 UTCJul 25, 17:55 UTC1h 55m
2026-07-25 SKW5529 LAX → RDD Jul 25, 01:55 UTCJul 25, 03:55 UTC2h 0m
2026-07-24 SKW5694 GRB → ORD Jul 24, 22:30 UTCJul 25, 00:10 UTC1h 40m
2026-07-24 SKW5694 GRB → ORD Jul 24, 22:24 UTCJul 24, 23:56 UTC1h 32m
2026-07-24 SKW5641 SJC → DEN Jul 24, 19:50 UTCJul 24, 21:15 UTC1h 25m
2026-07-24 SKW5772 ASE → DEN Jul 24, 18:10 UTCJul 24, 18:30 UTC20m
2026-07-24 SKW5782 DEN → ASE Jul 24, 16:10 UTCJul 24, 16:25 UTC15m
2026-07-24 SKW5766 ASE → DEN Jul 24, 13:50 UTCJul 24, 14:15 UTC25m
2026-07-24 SKW5779 BZN → SFO Jul 24, 02:00 UTCJul 24, 02:15 UTC15m
2026-07-24 SKW5779 BZN → SFO Jul 24, 01:53 UTCJul 24, 02:30 UTC37m
2026-07-24 SKW5778 ASE → DEN Jul 24, 00:35 UTCJul 24, 00:55 UTC20m
2026-07-24 SKW5778 ASE → DEN Jul 24, 00:18 UTCJul 24, 00:52 UTC34m
2026-07-23 SKW5773 BNA → ORD Jul 23, 21:25 UTCJul 23, 22:05 UTC40m
2026-07-23 SKW4767 HPN → ORD Jul 23, 19:35 UTCJul 23, 19:55 UTC20m
2026-07-23 SKW5343 SGF → IAH Jul 23, 17:39 UTCJul 23, 18:17 UTC38m
2026-07-23 SKW5343 SGF → IAH Jul 23, 17:35 UTCJul 23, 18:00 UTC25m
2026-07-23 SKW5770 ASE → DEN Jul 23, 15:50 UTCJul 23, 16:35 UTC45m
2026-07-23 SKW5770 ASE → DEN Jul 23, 15:45 UTCJul 23, 16:10 UTC25m
2026-07-23 SKW5444 SFO → PHX Jul 23, 14:15 UTCJul 23, 14:35 UTC20m
2026-07-23 SKW4634 FAR → ORD Jul 23, 03:05 UTCJul 23, 05:00 UTC1h 55m
2026-07-22 SKW4629 BOI → SFO Jul 22, 19:45 UTCJul 22, 21:15 UTC1h 30m
2026-07-22 SKW4629 BOI → SFO Jul 22, 19:50 UTCJul 22, 21:10 UTC1h 20m
2026-07-22 SKW4804 DTW → ORD Jul 22, 17:15 UTCJul 22, 18:20 UTC1h 5m
2026-07-22 SKW4809 ORD → ICT Jul 22, 14:20 UTCJul 22, 15:50 UTC1h 30m
2026-07-22 SKW4809 ORD → ICT Jul 22, 14:23 UTCJul 22, 15:45 UTC1h 22m
2026-07-22 SKW5611 OMA → ORD Jul 22, 11:20 UTCJul 22, 12:20 UTC1h 0m
2026-07-21 SKW5777 SBP → SFO Jul 21, 23:40 UTCJul 22, 00:45 UTC1h 5m
2026-07-21 SKW5780 SAT → IAH Jul 21, 21:25 UTCJul 21, 21:30 UTC5m
2026-07-21 SKW5780 SAT → IAH Jul 21, 19:55 UTCJul 21, 21:30 UTC1h 35m
2026-07-21 SKW5780 SAT → IAH Jul 21, 19:55 UTCJul 21, 21:10 UTC1h 15m
2026-07-21 SKW565J ORD → CMX Jul 21, 17:20 UTCJul 21, 18:25 UTC1h 5m
2026-07-21 SKW5300 LCH → IAH Jul 21, 13:50 UTCJul 21, 15:55 UTC2h 5m
2026-07-20 SKW5917 - Jul 20, 22:15 UTCJul 21, 00:00 UTC1h 44m
2026-07-20 SKW5493 - Jul 20, 18:40 UTCJul 20, 20:45 UTC2h 5m
2026-07-20 SKW5279 - Jul 20, 14:35 UTCJul 20, 16:50 UTC2h 15m
2026-07-20 SKW5553 SFO → SNA Jul 20, 11:15 UTCJul 20, 12:20 UTC1h 5m
2026-07-19 SKW769W - Jul 19, 23:45 UTCJul 20, 00:25 UTC40m
2026-07-19 SKW5956 ASE → ORD Jul 19, 19:15 UTCJul 19, 21:45 UTC2h 30m
2026-07-19 SKW5956 ASE → ORD Jul 19, 19:09 UTCJul 19, 21:19 UTC2h 10m
2026-07-19 SKW5814 RNO → SFO Jul 19, 15:35 UTCJul 19, 17:45 UTC2h 10m
2026-07-19 SKW5259 - Jul 19, 12:30 UTCJul 19, 13:10 UTC40m
2026-07-19 SKW376Z DEN → SHV Jul 19, 03:10 UTCJul 19, 05:00 UTC1h 50m
2026-07-18 SKW5776 JAC → SFO Jul 18, 21:45 UTCJul 18, 22:10 UTC25m
2026-07-18 SKW5771 RDM → DEN Jul 18, 20:05 UTCJul 18, 20:20 UTC15m

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 N637SY page for operator, model, and routing details .

Mode-S A85964 frequently asked

What is Mode-S code A85964?
A85964 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N637SY.
Where is Mode-S A85964 registered?
Mode-S code A85964 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 A85964 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A85964, octal 52054544, decimal 11,032,932.
What flights does A85964 operate?
Mode-S A85964 has broadcast 20 distinct callsigns, including SKW5771, SKW5956, SKW5520, SKW5441, SKW5814.