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sensors Mode-S transponder

A038FF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N113SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A038FF
Octal
50034377
Decimal
10,500,351
Country
US
Tail
N113SY
Type
E75L
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
678
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A038FF.

Country allocation

The ICAO 24-bit address A038FF 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
SKW5444 - 16 2026-07-16
SKW5771 SkyWest Airlines 11 2026-07-25
SKW5776 SkyWest Airlines 10 2026-07-26
SKW5769 - 10 2026-07-16
SKW5259 - 10 2026-07-20
SKW5956 SkyWest Airlines 9 2026-07-20
SKW5774 SkyWest Airlines 9 2026-07-16
SKW5772 SkyWest Airlines 9 2026-07-25
SKW5745 - 9 2026-07-12
SKW5782 - 7 2026-06-30
SKW5711 - 7 2026-07-17
SKW5576 SkyWest Airlines 7 2026-05-09
SKW376Z - 7 2026-07-20
SKW5814 SkyWest Airlines 6 2026-07-20
SKW5784 SkyWest Airlines 6 2026-04-29
SKW5777 - 6 2026-07-07
SKW5775 SkyWest Airlines 6 2026-05-31
SKW5773 - 6 2026-07-17
SKW5770 - 6 2026-07-17
SKW5641 SkyWest Airlines 6 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5641 SJC → DEN Jul 26, 20:35 UTCJul 26, 21:45 UTC1h 10m
2026-07-26 SKW5520 OKC → IAH Jul 26, 16:35 UTCJul 26, 18:20 UTC1h 45m
2026-07-26 SKW430X SFO → SBP Jul 26, 13:00 UTCJul 26, 15:50 UTC2h 50m
2026-07-26 SKW5776 JAC → SFO Jul 26, 01:45 UTCJul 26, 02:05 UTC20m
2026-07-26 SKW5776 JAC → SFO Jul 26, 01:31 UTCJul 26, 02:02 UTC31m
2026-07-25 SKW5771 RDM → DEN Jul 25, 20:00 UTCJul 25, 20:20 UTC20m
2026-07-25 SKW5772 ASE → DEN Jul 25, 18:30 UTCJul 25, 18:55 UTC25m
2026-07-25 SKW6046 SFO → STL Jul 25, 14:45 UTCJul 25, 16:20 UTC1h 35m
2026-07-25 SKW5550 DEN → GUC Jul 25, 03:15 UTCJul 25, 05:05 UTC1h 50m
2026-07-24 SKW5917 SFO → SEA Jul 24, 22:05 UTCJul 24, 23:55 UTC1h 50m
2026-07-24 SKW5493 SMF → SFO Jul 24, 18:30 UTCJul 24, 20:25 UTC1h 55m
2026-07-24 SKW5279 DEN → FSD Jul 24, 14:23 UTCJul 24, 17:05 UTC2h 42m
2026-07-24 SKW5279 DEN → FSD Jul 24, 14:40 UTCJul 24, 16:50 UTC2h 10m
2026-07-24 SKW5553 SFO → SNA Jul 24, 11:25 UTCJul 24, 12:10 UTC45m
2026-07-23 SKW769W ORD → DTW Jul 23, 23:25 UTCJul 24, 00:10 UTC45m
2026-07-23 SKW4669 ACV → SFO Jul 23, 19:05 UTCJul 23, 21:10 UTC2h 5m
2026-07-23 SKW420W ACV → LAX Jul 23, 15:05 UTCJul 23, 17:30 UTC2h 25m
2026-07-22 SKW5524 SFO → ONT Jul 22, 22:05 UTCJul 22, 23:45 UTC1h 40m
2026-07-22 SKW5403 LGA → ORD Jul 22, 19:30 UTCJul 22, 20:30 UTC1h 0m
2026-07-22 SKW5403 LGA → ORD Jul 22, 19:20 UTCJul 22, 20:35 UTC1h 15m
2026-07-22 SKW4669 ACV → SFO Jul 22, 16:00 UTCJul 22, 18:05 UTC2h 5m
2026-07-22 SKW435T BOI → SFO Jul 22, 14:35 UTCJul 22, 14:50 UTC15m
2026-07-22 SKW5254 EUG → SFO Jul 22, 02:00 UTCJul 22, 04:10 UTC2h 10m
2026-07-21 SKW5524 SFO → ONT Jul 21, 22:00 UTCJul 22, 00:05 UTC2h 5m
2026-07-21 SKW5403 - Jul 21, 19:05 UTCJul 21, 20:25 UTC1h 20m
2026-07-21 SKW4669 ACV → SFO Jul 21, 15:15 UTCJul 21, 17:30 UTC2h 15m
2026-07-21 SKW5254 EUG → SFO Jul 21, 01:25 UTCJul 21, 03:40 UTC2h 15m
2026-07-20 SKW5956 ASE → ORD Jul 20, 19:05 UTCJul 20, 21:20 UTC2h 15m
2026-07-20 SKW5814 RNO → SFO Jul 20, 15:20 UTCJul 20, 17:30 UTC2h 10m
2026-07-20 SKW5259 - Jul 20, 12:55 UTCJul 20, 13:45 UTC50m
2026-07-20 SKW376Z DEN → SHV Jul 20, 00:40 UTCJul 20, 02:25 UTC1h 45m
2026-07-19 SKW5749 PIT → ORD Jul 19, 21:55 UTCJul 19, 22:30 UTC35m
2026-07-19 SKW5749 PIT → ORD Jul 19, 21:52 UTCJul 19, 22:19 UTC27m
2026-07-19 SKW342F - Jul 19, 19:55 UTCJul 19, 20:20 UTC25m
2026-07-19 SKW5787 - Jul 19, 16:20 UTCJul 19, 18:25 UTC2h 5m
2026-07-19 SKW5787 FAT → DEN Jul 19, 16:13 UTCJul 19, 18:08 UTC1h 55m
2026-07-19 SKW5329 - Jul 19, 04:55 UTCJul 19, 05:30 UTC35m
2026-07-19 SKW5329 LAX → FAT Jul 19, 04:52 UTCJul 19, 05:30 UTC38m
2026-07-19 SKW5940 ORD → MCI Jul 19, 01:30 UTCJul 19, 03:00 UTC1h 30m
2026-07-19 SKW5940 ORD → MCI Jul 19, 01:32 UTCJul 19, 02:53 UTC1h 21m
2026-07-18 SKW5697 - Jul 18, 22:35 UTCJul 18, 22:50 UTC15m
2026-07-18 SKW5697 DEN → ASE Jul 18, 22:40 UTCJul 18, 23:00 UTC20m
2026-07-18 SKW5607 TVC → DEN Jul 18, 20:40 UTCJul 18, 21:05 UTC25m
2026-07-18 SKW4700 - Jul 18, 17:40 UTCJul 18, 19:10 UTC1h 30m
2026-07-18 SKW5740 SFO → ONT Jul 18, 14:25 UTCJul 18, 16:10 UTC1h 45m
2026-07-17 SKW5711 - Jul 17, 23:55 UTCJul 18, 01:34 UTC1h 40m
2026-07-17 SKW5711 SFO → ASE Jul 17, 23:47 UTCJul 18, 01:49 UTC2h 2m
2026-07-17 SKW5452 - Jul 17, 21:55 UTCJul 17, 22:45 UTC50m
2026-07-17 SKW4701 DEN → RDD Jul 17, 18:25 UTCJul 17, 20:40 UTC2h 15m
2026-07-17 SKW5770 - Jul 17, 16:40 UTCJul 17, 17:05 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 N113SY page for operator, model, and routing details .

Mode-S A038FF frequently asked

What is Mode-S code A038FF?
A038FF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N113SY.
Where is Mode-S A038FF registered?
Mode-S code A038FF 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 A038FF 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 A038FF, octal 50034377, decimal 10,500,351.
What flights does A038FF operate?
Mode-S A038FF has broadcast 20 distinct callsigns, including SKW5444, SKW5771, SKW5776, SKW5769, SKW5259.