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sensors Mode-S transponder

AC04C3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N87365 · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AC04C3
Octal
53002303
Decimal
11,273,411
Country
US
Tail
N87365
Type
E75L
No current signal · last broadcast Jul 26, 22:05 UTC
Flights observed
524
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:05 UTC

Last known position

Most recent position reported by Mode-S AC04C3.

Country allocation

The ICAO 24-bit address AC04C3 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
SKW4788 SkyWest Airlines 7 2026-07-23
SKW5416 - 6 2026-07-09
SKW5999 SkyWest Airlines 5 2026-05-07
SKW5862 SkyWest Airlines 5 2026-07-24
SKW5812 - 5 2026-07-17
SKW5694 - 5 2026-06-19
SKW5641 - 5 2026-06-19
SKW5536 - 5 2026-07-15
SKW5267 - 5 2026-07-17
SKW5261 SkyWest Airlines 5 2026-07-18
SKW4730 - 5 2026-07-22
SKW6041 - 4 2026-07-16
SKW5840 SkyWest Airlines 4 2026-06-07
SKW5729 SkyWest Airlines 4 2026-06-25
SKW5702 SkyWest Airlines 4 2026-06-09
SKW5647 SkyWest Airlines 4 2026-07-25
SKW5639 SkyWest Airlines 4 2026-06-28
SKW5635 - 4 2026-07-05
SKW5613 SkyWest Airlines 4 2026-06-07
SKW5574 - 4 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5427 SFO → EUG Jul 26, 19:45 UTCJul 26, 22:05 UTC2h 20m
2026-07-26 SKW5728 ORD → DCA Jul 26, 15:40 UTCJul 26, 17:30 UTC1h 50m
2026-07-26 SKW5728 ORD → DCA Jul 26, 15:55 UTCJul 26, 18:14 UTC2h 19m
2026-07-26 SKW5849 SFO → SUN Jul 26, 13:13 UTCJul 26, 13:58 UTC45m
2026-07-26 SKW5849 SFO → SUN Jul 26, 13:05 UTCJul 26, 14:05 UTC1h 0m
2026-07-26 SKW5319 GEG → SFO Jul 26, 05:50 UTCJul 26, 06:50 UTC1h 1m
2026-07-26 SKW5636 SJC → DEN Jul 26, 04:10 UTCJul 26, 04:35 UTC25m
2026-07-26 SKW5415 ICT → DEN Jul 26, 02:45 UTCJul 26, 03:15 UTC30m
2026-07-26 SKW5415 ICT → DEN Jul 26, 02:18 UTCJul 26, 03:09 UTC51m
2026-07-25 SKW5489 ASE → SFO Jul 25, 21:40 UTCJul 26, 00:55 UTC3h 15m
2026-07-25 SKW5489 ASE → SFO Jul 25, 21:41 UTCJul 26, 00:45 UTC3h 4m
2026-07-25 SKW5426 FAT → LAX Jul 25, 17:25 UTCJul 25, 20:25 UTC3h 0m
2026-07-25 SKW4741 DEN → AUS Jul 25, 03:30 UTCJul 25, 16:10 UTC12h 40m
2026-07-25 SKW5647 SJC → DEN Jul 25, 01:35 UTCJul 25, 02:05 UTC30m
2026-07-24 SKW5862 FAR → DEN Jul 24, 23:40 UTCJul 25, 00:30 UTC50m
2026-07-24 SKW5217 SFO → TUS Jul 24, 20:30 UTCJul 24, 22:40 UTC2h 10m
2026-07-24 SKW5217 SFO → TUS Jul 24, 20:31 UTCJul 24, 22:24 UTC1h 53m
2026-07-24 SKW5612 ORD → GEG Jul 24, 16:00 UTCJul 24, 19:30 UTC3h 30m
2026-07-24 SKW5820 MAF → DEN Jul 24, 11:15 UTCJul 24, 12:30 UTC1h 15m
2026-07-24 SKW5820 MAF → DEN Jul 24, 11:23 UTCJul 24, 12:32 UTC1h 9m
2026-07-23 SKW5763 ORD → TUL Jul 23, 23:50 UTCJul 24, 01:00 UTC1h 10m
2026-07-23 SKW5763 ORD → TUL Jul 23, 23:59 UTCJul 24, 00:59 UTC1h 0m
2026-07-23 SKW5262 ORD → MKE Jul 23, 21:30 UTCJul 23, 22:05 UTC35m
2026-07-23 SKW5262 ORD → MKE Jul 23, 21:01 UTCJul 23, 21:58 UTC57m
2026-07-23 SKW5509 - Jul 23, 19:35 UTCJul 23, 20:05 UTC30m
2026-07-23 SKW4788 GEG → SFO Jul 23, 14:45 UTCJul 23, 17:45 UTC3h 0m
2026-07-23 SKW5986 SLC → SFO Jul 23, 02:15 UTCJul 23, 03:20 UTC1h 5m
2026-07-22 SKW5256 SFO → GEG Jul 22, 23:20 UTCJul 23, 00:05 UTC45m
2026-07-22 SKW5256 SFO → GEG Jul 22, 23:12 UTCJul 22, 23:59 UTC47m
2026-07-22 SKW5464 RDM → SFO Jul 22, 21:15 UTCJul 22, 22:05 UTC50m
2026-07-22 SKW5899 RNO → SFO Jul 22, 19:25 UTCJul 22, 20:20 UTC55m
2026-07-22 SKW5410 - Jul 22, 16:35 UTCJul 22, 17:35 UTC1h 0m
2026-07-22 SKW4730 - Jul 22, 13:20 UTCJul 22, 15:20 UTC2h 0m
2026-07-22 SKW4730 BOI → LAX Jul 22, 13:19 UTCJul 22, 15:07 UTC1h 48m
2026-07-22 SKW5387 MTY → ORD Jul 22, 00:25 UTCJul 22, 01:35 UTC1h 10m
2026-07-21 SKW5452 - Jul 21, 21:20 UTCJul 21, 22:10 UTC50m
2026-07-21 SKW4701 DEN → MOT Jul 21, 18:10 UTCJul 21, 20:15 UTC2h 5m
2026-07-21 SKW4659 ABQ → DEN Jul 21, 15:15 UTCJul 21, 16:10 UTC55m
2026-07-21 SKW4761 LGA → ORD Jul 21, 04:00 UTCJul 21, 05:00 UTC1h 0m
2026-07-21 SKW6032 FCA → SFO Jul 21, 00:10 UTCJul 21, 01:30 UTC1h 20m
2026-07-20 SKW5280 ORD → CID Jul 20, 22:00 UTCJul 20, 23:15 UTC1h 15m
2026-07-20 SKW5277 MBS → ORD Jul 20, 18:55 UTCJul 20, 20:20 UTC1h 25m
2026-07-20 SKW5211 LGA → IAH Jul 20, 16:05 UTCJul 20, 17:20 UTC1h 15m
2026-07-20 SKW5602 - Jul 20, 13:40 UTCJul 20, 14:05 UTC25m
2026-07-20 SKW776V DEN → GUC Jul 20, 01:50 UTCJul 20, 02:15 UTC25m
2026-07-19 SKW4634 - Jul 19, 22:20 UTCJul 19, 23:55 UTC1h 35m
2026-07-19 SKW4634 FAR → DEN Jul 19, 22:27 UTCJul 19, 23:48 UTC1h 21m
2026-07-19 SKW4629 BOI → SFO Jul 19, 19:45 UTCJul 19, 20:45 UTC1h 0m
2026-07-19 SKW4629 BOI → SFO Jul 19, 19:50 UTCJul 19, 21:07 UTC1h 17m
2026-07-19 SKW5834 ABQ → DEN Jul 19, 17:05 UTCJul 19, 18:05 UTC1h 0m

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 N87365 page for operator, model, and routing details .

Mode-S AC04C3 frequently asked

What is Mode-S code AC04C3?
AC04C3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N87365.
Where is Mode-S AC04C3 registered?
Mode-S code AC04C3 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 AC04C3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC04C3, octal 53002303, decimal 11,273,411.
What flights does AC04C3 operate?
Mode-S AC04C3 has broadcast 20 distinct callsigns, including SKW4788, SKW5416, SKW5999, SKW5862, SKW5812.