Apparatus

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sensors Mode-S transponder

A9903A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N715SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9903A
Octal
52310072
Decimal
11,112,506
Country
US
Tail
N715SK
Type
CRJ7
Broadcasting now · callsign SKW4831 · 33,375 ft
Flights observed
625
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A9903A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A9903A 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
SKW4966 - 16 2026-07-06
SKW6513 SkyWest Airlines 15 2026-05-15
SKW6396 SkyWest Airlines 13 2026-05-02
SKW5000 SkyWest Airlines 12 2026-05-09
SKW6398 - 10 2026-07-10
SKW6194 SkyWest Airlines 10 2026-06-04
SKW6385 - 9 2026-07-01
SKW4999 SkyWest Airlines 9 2026-05-01
SKW4895 SkyWest Airlines 9 2026-05-08
SKW6408 SkyWest Airlines 8 2026-04-25
SKW6377 SkyWest Airlines 8 2026-05-02
SKW6240 SkyWest Airlines 8 2026-06-05
SKW4891 SkyWest Airlines 8 2026-06-12
SKW6244 - 7 2026-07-10
SKW6191 SkyWest Airlines 7 2026-06-07
SKW4955 - 7 2026-06-16
SKW4954 SkyWest Airlines 7 2026-04-30
SKW6446 SkyWest Airlines 6 2026-06-21
SKW6436 - 6 2026-07-01
SKW6414 SkyWest Airlines 6 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW4828 - Jul 14, 15:50 UTCJul 14, 16:30 UTC40m
2026-07-14 SKW6450 - Jul 14, 12:20 UTCJul 14, 14:05 UTC1h 45m
2026-07-14 SKW6412 - Jul 14, 00:45 UTCJul 14, 02:40 UTC1h 55m
2026-07-13 SKW6439 - Jul 13, 22:20 UTCJul 13, 23:00 UTC40m
2026-07-13 SKW6439 TYS → CLT Jul 13, 22:21 UTCJul 13, 22:55 UTC34m
2026-07-13 SKW6439 - Jul 13, 20:35 UTCJul 13, 21:15 UTC40m
2026-07-13 SKW6196 - Jul 13, 18:05 UTCJul 13, 19:00 UTC55m
2026-07-13 SKW6196 BHM → CLT Jul 13, 18:07 UTCJul 13, 18:58 UTC51m
2026-07-13 SKW4932 - Jul 13, 16:20 UTCJul 13, 17:20 UTC1h 0m
2026-07-13 SKW4829 - Jul 13, 13:15 UTCJul 13, 14:00 UTC45m
2026-07-13 SKW4829 LWB → CLT Jul 13, 13:15 UTCJul 13, 13:49 UTC34m
2026-07-12 SKW4834 - Jul 12, 20:40 UTCJul 12, 21:45 UTC1h 5m
2026-07-12 SKW6261 - Jul 12, 17:15 UTCJul 12, 18:10 UTC55m
2026-07-12 SKW6261 CVG → ORD Jul 12, 17:11 UTCJul 12, 18:03 UTC52m
2026-07-12 SKW6261 ORD → CVG Jul 12, 15:35 UTCJul 12, 16:25 UTC50m
2026-07-12 SKW6213 - Jul 12, 12:30 UTCJul 12, 12:55 UTC25m
2026-07-12 SKW4941 - Jul 12, 00:20 UTCJul 12, 00:35 UTC15m
2026-07-12 SKW4941 ORD → MKE Jul 12, 00:18 UTCJul 12, 00:36 UTC18m
2026-07-11 SKW6200 - Jul 11, 21:25 UTCJul 11, 22:50 UTC1h 25m
2026-07-11 SKW6200 - Jul 11, 19:15 UTCJul 11, 20:15 UTC1h 0m
2026-07-11 SKW6250 - Jul 11, 14:20 UTCJul 11, 15:20 UTC1h 0m
2026-07-11 SKW6250 - Jul 11, 12:30 UTCJul 11, 13:25 UTC55m
2026-07-11 SKW6476 - Jul 11, 00:00 UTCJul 11, 00:25 UTC25m
2026-07-10 SKW6476 MLI → ORD Jul 10, 23:56 UTCJul 11, 00:24 UTC28m
2026-07-10 SKW6476 - Jul 10, 22:40 UTCJul 10, 23:10 UTC30m
2026-07-10 SKW5008 - Jul 10, 20:10 UTCJul 10, 21:10 UTC1h 0m
2026-07-10 SKW5008 ORD → DAY Jul 10, 18:30 UTCJul 10, 19:20 UTC50m
2026-07-10 SKW6244 - Jul 10, 15:35 UTCJul 10, 16:45 UTC1h 10m
2026-07-10 SKW6244 - Jul 10, 13:45 UTCJul 10, 14:35 UTC50m
2026-07-10 SKW4826 ALO → ORD Jul 10, 10:20 UTCJul 10, 11:10 UTC50m
2026-07-10 SKW4824 - Jul 10, 05:15 UTCJul 10, 05:55 UTC40m
2026-07-10 SKW4824 ORD → ALO Jul 10, 05:13 UTCJul 10, 05:53 UTC40m
2026-07-10 SKW6398 - Jul 10, 03:00 UTCJul 10, 03:50 UTC50m
2026-07-10 SKW6398 - Jul 10, 01:15 UTCJul 10, 03:50 UTC2h 35m
2026-07-10 SKW6398 SYR → ORD Jul 10, 01:09 UTCJul 10, 02:43 UTC1h 34m
2026-07-09 SKW6398 - Jul 9, 22:55 UTCJul 10, 00:10 UTC1h 15m
2026-07-09 SKW6418 - Jul 9, 20:15 UTCJul 9, 20:45 UTC30m
2026-07-09 SKW6418 AZO → ORD Jul 9, 20:12 UTCJul 9, 20:44 UTC32m
2026-07-09 SKW6418 - Jul 9, 18:55 UTCJul 9, 19:25 UTC30m
2026-07-09 SKW5003 - Jul 9, 15:50 UTCJul 9, 17:20 UTC1h 30m
2026-07-09 SKW5003 - Jul 9, 13:30 UTCJul 9, 14:40 UTC1h 10m
2026-07-09 SKW6231 LNK → ORD Jul 9, 10:47 UTCJul 9, 12:00 UTC1h 13m
2026-07-09 SKW6231 - Jul 9, 10:50 UTCJul 9, 12:05 UTC1h 15m
2026-07-09 SKW6198 - Jul 9, 02:20 UTCJul 9, 04:20 UTC2h 0m
2026-07-09 SKW6234 - Jul 9, 00:35 UTCJul 9, 01:00 UTC25m
2026-07-08 SKW6234 DFW → LAW Jul 8, 22:55 UTCJul 8, 23:30 UTC35m
2026-07-08 SKW6390 COS → DFW Jul 8, 20:22 UTCJul 8, 21:41 UTC1h 19m
2026-07-08 SKW6390 COS → DFW Jul 8, 20:25 UTCJul 8, 21:45 UTC1h 20m
2026-07-08 SKW6390 - Jul 8, 16:45 UTCJul 8, 18:05 UTC1h 20m
2026-07-08 SKW6345 - Jul 8, 14:05 UTCJul 8, 15:35 UTC1h 30m

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 N715SK page for operator, model, and routing details .

Mode-S A9903A frequently asked

What is Mode-S code A9903A?
A9903A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N715SK.
Where is Mode-S A9903A registered?
Mode-S code A9903A 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 A9903A broadcasting right now?
Yes. Mode-S A9903A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9903A, octal 52310072, decimal 11,112,506.
What flights does A9903A operate?
Mode-S A9903A has broadcast 20 distinct callsigns, including SKW4966, SKW6513, SKW6396, SKW5000, SKW6398.