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sensors Mode-S transponder

AAC4C4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N793SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
AAC4C4
Octal
52542304
Decimal
11,191,492
Country
US
Tail
N793SK
Type
CRJ7
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
543
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AAC4C4.

Country allocation

The ICAO 24-bit address AAC4C4 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
SKW5869 - 13 2026-07-10
SKW5609 SkyWest Airlines 7 2026-06-10
SKW5553 SkyWest Airlines 7 2026-05-15
SKW4807 SkyWest Airlines 7 2026-07-24
SKW5912 - 6 2026-07-06
SKW5333 SkyWest Airlines 6 2026-07-24
SKW5890 SkyWest Airlines 5 2026-06-09
SKW5751 SkyWest Airlines 5 2026-06-10
SKW5530 SkyWest Airlines 5 2026-05-15
SKW5215 SkyWest Airlines 5 2026-07-26
SKW5989 - 4 2026-06-26
SKW595Y SkyWest Airlines 4 2026-05-16
SKW5825 SkyWest Airlines 4 2026-07-26
SKW5720 - 4 2026-07-17
SKW5703 - 4 2026-07-17
SKW5689 SkyWest Airlines 4 2026-07-25
SKW5629 - 4 2026-07-17
SKW5612 SkyWest Airlines 4 2026-06-09
SKW5528 - 4 2026-07-20
SKW5473 SkyWest Airlines 4 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5431 LNK → DEN Jul 26, 22:25 UTCJul 26, 23:00 UTC35m
2026-07-26 SKW5827 PSP → SFO Jul 26, 20:15 UTCJul 26, 21:15 UTC1h 0m
2026-07-26 SKW5825 SFO → BOI Jul 26, 17:00 UTCJul 26, 18:05 UTC1h 5m
2026-07-26 SKW5215 LGA → ORD Jul 26, 15:00 UTCJul 26, 16:10 UTC1h 10m
2026-07-25 SKW5639 SJC → SEA Jul 25, 23:55 UTCJul 26, 01:35 UTC1h 40m
2026-07-25 SKW5689 SMF → SFO Jul 25, 21:30 UTCJul 25, 22:40 UTC1h 10m
2026-07-25 SKW5689 SMF → SFO Jul 25, 21:31 UTCJul 25, 22:39 UTC1h 8m
2026-07-25 SKW4778 MKE → ORD Jul 25, 18:25 UTCJul 25, 19:45 UTC1h 20m
2026-07-25 SKW4688 DEN → FAR Jul 25, 16:05 UTCJul 25, 17:30 UTC1h 25m
2026-07-25 SKW4799 ORD → CRW Jul 25, 00:35 UTCJul 25, 01:45 UTC1h 10m
2026-07-24 SKW5643 ORD → TYS Jul 24, 22:25 UTCJul 24, 23:00 UTC35m
2026-07-24 SKW5643 ORD → TYS Jul 24, 22:23 UTCJul 24, 23:17 UTC54m
2026-07-24 SKW4807 SFO → BUR Jul 24, 19:00 UTCJul 24, 20:25 UTC1h 25m
2026-07-24 SKW5333 ORD → MSN Jul 24, 16:30 UTCJul 24, 17:40 UTC1h 10m
2026-07-24 SKW5346 DEN → STL Jul 24, 13:25 UTCJul 24, 14:35 UTC1h 10m
2026-07-24 SKW5346 DEN → STL Jul 24, 13:25 UTCJul 24, 14:31 UTC1h 6m
2026-07-23 SKW455E DEN → HOB Jul 23, 23:45 UTCJul 24, 00:50 UTC1h 5m
2026-07-23 SKW4807 SFO → BUR Jul 23, 19:00 UTCJul 23, 20:15 UTC1h 15m
2026-07-23 SKW5333 ORD → MSN Jul 23, 16:35 UTCJul 23, 17:55 UTC1h 20m
2026-07-23 SKW5367 YUL → ORD Jul 23, 13:15 UTCJul 23, 14:10 UTC55m
2026-07-23 SKW6080 BNA → ORD Jul 23, 02:45 UTCJul 23, 03:30 UTC45m
2026-07-23 SKW6080 BNA → ORD Jul 23, 02:42 UTCJul 23, 03:49 UTC1h 7m
2026-07-23 SKW4776 ACV → SFO Jul 23, 00:30 UTCJul 23, 01:40 UTC1h 10m
2026-07-22 SKW5209 - Jul 22, 19:15 UTCJul 22, 20:40 UTC1h 25m
2026-07-21 SKW455E DEN → HOB Jul 21, 00:05 UTCJul 21, 01:10 UTC1h 5m
2026-07-20 SKW5528 - Jul 20, 21:20 UTCJul 20, 22:10 UTC50m
2026-07-20 SKW5528 XWA → DEN Jul 20, 20:37 UTCJul 20, 22:05 UTC1h 28m
2026-07-20 SKW5302 ORD → CVG Jul 20, 18:00 UTCJul 20, 18:40 UTC40m
2026-07-20 SKW5302 ORD → CVG Jul 20, 18:02 UTCJul 20, 19:18 UTC1h 16m
2026-07-20 SKW4725 DEN → BFL Jul 20, 15:15 UTCJul 20, 15:40 UTC25m
2026-07-20 SKW764Y DEN → COS Jul 20, 04:05 UTCJul 20, 04:20 UTC15m
2026-07-19 SKW5878 SAF → DEN Jul 19, 19:40 UTCJul 19, 20:35 UTC55m
2026-07-19 SKW5310 DEN → SAF Jul 19, 17:50 UTCJul 19, 18:35 UTC45m
2026-07-18 SKW5678 DEN → DEN Jul 18, 20:00 UTCJul 19, 14:15 UTC18h 15m
2026-07-18 SKW5825 LNK → DEN Jul 18, 17:20 UTCJul 18, 18:20 UTC1h 0m
2026-07-18 SKW5215 - Jul 18, 14:50 UTCJul 18, 15:55 UTC1h 5m
2026-07-18 SKW5598 - Jul 18, 11:35 UTCJul 18, 12:10 UTC35m
2026-07-18 SKW5539 - Jul 18, 04:35 UTCJul 18, 04:55 UTC20m
2026-07-18 SKW5336 - Jul 18, 01:10 UTCJul 18, 02:35 UTC1h 25m
2026-07-17 SKW4742 - Jul 17, 22:20 UTCJul 17, 23:35 UTC1h 15m
2026-07-17 SKW4742 ORD → MEM Jul 17, 22:34 UTCJul 17, 23:33 UTC59m
2026-07-17 SKW4748 - Jul 17, 20:50 UTCJul 17, 21:15 UTC25m
2026-07-17 SKW5720 - Jul 17, 18:10 UTCJul 17, 18:29 UTC20m
2026-07-17 SKW5629 - Jul 17, 14:35 UTCJul 17, 15:25 UTC50m
2026-07-17 SKW5703 - Jul 17, 12:40 UTCJul 17, 13:29 UTC50m
2026-07-16 SKW4691 - Jul 16, 19:55 UTCJul 16, 20:35 UTC40m
2026-07-16 SKW4647 ORD → CID Jul 16, 18:19 UTCJul 16, 18:55 UTC35m
2026-07-16 SKW5657 - Jul 16, 15:55 UTCJul 16, 16:19 UTC25m
2026-07-16 SKW5656 - Jul 16, 14:05 UTCJul 16, 14:25 UTC20m
2026-07-16 SKW5076 PAH → ORD Jul 16, 11:51 UTCJul 16, 12:50 UTC59m

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 N793SK page for operator, model, and routing details .

Mode-S AAC4C4 frequently asked

What is Mode-S code AAC4C4?
AAC4C4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N793SK.
Where is Mode-S AAC4C4 registered?
Mode-S code AAC4C4 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 AAC4C4 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 AAC4C4, octal 52542304, decimal 11,191,492.
What flights does AAC4C4 operate?
Mode-S AAC4C4 has broadcast 20 distinct callsigns, including SKW5869, SKW5609, SKW5553, SKW4807, SKW5912.