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sensors Mode-S transponder

AC018C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N873AS · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
AC018C
Octal
53000614
Decimal
11,272,588
Country
US
Tail
N873AS
Type
CRJ2
No current signal · last broadcast Jul 18, 18:15 UTC
Flights observed
632
Distinct callsigns
20
Country
US
Last broadcast
Jul 18, 18:15 UTC

Last known position

Most recent position reported by Mode-S AC018C.

Country allocation

The ICAO 24-bit address AC018C 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
SKW4698 SkyWest Airlines 9 2026-06-02
SKW5111 - 8 2026-07-13
SKW5739 SkyWest Airlines 6 2026-06-02
SKW5634 - 6 2026-07-17
SKW5137 - 6 2026-07-16
SKW5915 SkyWest Airlines 5 2026-05-31
SKW5246 SkyWest Airlines 5 2026-07-17
SKW5139 SkyWest Airlines 5 2026-06-08
SKW5096 - 5 2026-07-06
SKW5080 - 5 2026-07-13
SKW792R - 4 2026-07-05
SKW775E SkyWest Airlines 4 2026-06-21
SKW744C - 4 2026-07-16
SKW6073 SkyWest Airlines 4 2026-06-06
SKW6067 SkyWest Airlines 4 2026-06-05
SKW6058 - 4 2026-06-20
SKW5949 SkyWest Airlines 4 2026-06-04
SKW5674 - 4 2026-06-25
SKW5376 SkyWest Airlines 4 2026-05-12
SKW5344 SkyWest Airlines 4 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 SKW6080 BNA → ORD Jul 18, 16:40 UTCJul 18, 18:15 UTC1h 35m
2026-07-17 SKW5634 COS → DEN Jul 17, 15:41 UTCJul 17, 16:07 UTC26m
2026-07-17 SKW5634 COS → DEN Jul 17, 15:44 UTCJul 17, 16:10 UTC25m
2026-07-17 SKW5246 RDD → SFO Jul 17, 14:20 UTCJul 17, 14:39 UTC20m
2026-07-17 SKW5109 - Jul 17, 11:39 UTCJul 17, 12:40 UTC1h 0m
2026-07-17 SKW393X DEN → EAR Jul 17, 03:30 UTCJul 17, 04:14 UTC45m
2026-07-16 SKW5137 - Jul 16, 11:50 UTCJul 16, 12:20 UTC30m
2026-07-16 SKW744C - Jul 16, 02:35 UTCJul 16, 03:05 UTC30m
2026-07-16 SKW744C DEN → HYS Jul 16, 02:43 UTCJul 16, 03:19 UTC36m
2026-07-15 SKW4650 BIS → DEN Jul 15, 23:43 UTCJul 16, 00:39 UTC56m
2026-07-15 SKW4734 - Jul 15, 21:10 UTCJul 15, 22:05 UTC55m
2026-07-15 SKW5649 LNK → DEN Jul 15, 18:10 UTCJul 15, 19:10 UTC1h 0m
2026-07-15 SKW5831 DEN → LNK Jul 15, 15:55 UTCJul 15, 17:00 UTC1h 5m
2026-07-15 SKW5221 - Jul 15, 13:35 UTCJul 15, 14:20 UTC45m
2026-07-15 SKW5221 AMA → DEN Jul 15, 13:20 UTCJul 15, 14:09 UTC49m
2026-07-15 SKW5494 - Jul 15, 01:35 UTCJul 15, 02:05 UTC30m
2026-07-15 SKW5494 DEN → AMA Jul 15, 01:39 UTCJul 15, 02:28 UTC49m
2026-07-14 SKW5590 - Jul 14, 22:20 UTCJul 14, 23:35 UTC1h 14m
2026-07-14 SKW5590 BIL → DEN Jul 14, 22:27 UTCJul 14, 23:35 UTC1h 8m
2026-07-14 SKW5845 - Jul 14, 20:00 UTCJul 14, 21:10 UTC1h 10m
2026-07-14 SKW5028 - Jul 14, 16:55 UTCJul 14, 17:35 UTC40m
2026-07-14 SKW645V - Jul 14, 01:55 UTCJul 14, 02:25 UTC30m
2026-07-13 SKW5590 - Jul 13, 22:20 UTCJul 13, 23:30 UTC1h 10m
2026-07-13 SKW5845 DEN → BIL Jul 13, 20:05 UTCJul 13, 21:02 UTC57m
2026-07-13 SKW5845 - Jul 13, 20:00 UTCJul 13, 21:05 UTC1h 5m
2026-07-13 SKW5111 - Jul 13, 16:45 UTCJul 13, 18:10 UTC1h 25m
2026-07-13 SKW5111 JMS → DEN Jul 13, 16:45 UTCJul 13, 18:05 UTC1h 20m
2026-07-13 SKW5080 - Jul 13, 14:15 UTCJul 13, 15:30 UTC1h 15m
2026-07-13 SKW5080 DEN → JMS Jul 13, 14:09 UTCJul 13, 15:30 UTC1h 21m
2026-07-13 SKW5061 - Jul 13, 11:25 UTCJul 13, 11:55 UTC30m
2026-07-13 SKW5061 LBF → DEN Jul 13, 11:34 UTCJul 13, 11:51 UTC17m
2026-07-13 SKW339A - Jul 13, 02:45 UTCJul 13, 03:10 UTC25m
2026-07-12 SKW5098 DIK → DEN Jul 12, 23:47 UTCJul 13, 00:56 UTC1h 9m
2026-07-12 SKW5098 - Jul 12, 21:35 UTCJul 13, 01:01 UTC3h 25m
2026-07-12 SKW5634 COS → DEN Jul 12, 15:41 UTCJul 12, 16:05 UTC24m
2026-07-12 SKW5634 COS → DEN Jul 12, 15:40 UTCJul 12, 16:10 UTC30m
2026-07-12 SKW5246 DEN → COS Jul 12, 14:10 UTCJul 12, 14:25 UTC15m
2026-07-12 SKW4697 COS → DEN Jul 12, 11:45 UTCJul 12, 12:10 UTC25m
2026-07-11 SKMX873 - Jul 11, 01:15 UTCJul 11, 01:30 UTC15m
2026-07-10 SKW5099 - Jul 10, 22:30 UTCJul 10, 23:00 UTC30m
2026-07-10 SKW5099 BFF → DEN Jul 10, 22:06 UTCJul 10, 23:03 UTC57m
2026-07-10 SKW5099 - Jul 10, 21:00 UTCJul 10, 21:20 UTC20m
2026-07-10 SKW5089 DEN → COD Jul 10, 18:26 UTCJul 10, 19:31 UTC1h 5m
2026-07-10 SKW5089 - Jul 10, 18:15 UTCJul 10, 21:00 UTC2h 45m
2026-07-10 SKW5400 COS → DEN Jul 10, 17:00 UTCJul 10, 17:25 UTC25m
2026-07-10 SKW5246 DEN → COS Jul 10, 14:04 UTCJul 10, 14:16 UTC12m
2026-07-10 SKW5246 DEN → COS Jul 10, 13:55 UTCJul 10, 14:20 UTC25m
2026-07-10 SKW5109 - Jul 10, 11:35 UTCJul 10, 12:40 UTC1h 5m
2026-07-10 SKW483J - Jul 10, 00:15 UTCJul 10, 01:40 UTC1h 25m
2026-07-09 SKW5047 - Jul 9, 21:00 UTCJul 9, 22:50 UTC1h 50m

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 N873AS page for operator, model, and routing details .

Mode-S AC018C frequently asked

What is Mode-S code AC018C?
AC018C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N873AS.
Where is Mode-S AC018C registered?
Mode-S code AC018C 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 AC018C broadcasting right now?
No active broadcast right now. Last signal was Jul 18, 18:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC018C, octal 53000614, decimal 11,272,588.
What flights does AC018C operate?
Mode-S AC018C has broadcast 20 distinct callsigns, including SKW4698, SKW5111, SKW5739, SKW5634, SKW5137.