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sensors Mode-S transponder

AC04C2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N87364 · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AC04C2
Octal
53002302
Decimal
11,273,410
Country
US
Tail
N87364
Type
E75L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
654
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S AC04C2.

Country allocation

The ICAO 24-bit address AC04C2 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
SKW5578 - 11 2026-07-20
SKW5375 SkyWest Airlines 10 2026-05-30
SKW5328 - 9 2026-07-16
SKW463C SkyWest Airlines 9 2026-07-20
SKW5655 - 8 2026-07-05
SKW5571 SkyWest Airlines 8 2026-06-09
SKW5307 - 8 2026-07-05
SKW5662 - 7 2026-06-29
SKW5512 SkyWest Airlines 7 2026-07-20
SKW5461 - 7 2026-07-11
SKW4692 - 7 2026-07-20
SKW4678 - 7 2026-07-16
SKW5394 - 6 2026-07-16
SKW5382 SkyWest Airlines 6 2026-06-09
SKW5363 - 6 2026-07-16
SKW5268 - 6 2026-07-12
SKW717C - 5 2026-07-12
SKW6046 - 5 2026-07-07
SKW5966 - 5 2026-07-04
SKW5858 - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5350 RDM → SFO Jul 26, 22:10 UTCJul 26, 22:30 UTC20m
2026-07-26 SKW5337 ORD → SAV Jul 26, 19:35 UTCJul 26, 20:55 UTC1h 20m
2026-07-26 SKW5874 YUL → ORD Jul 26, 15:35 UTCJul 26, 17:50 UTC2h 15m
2026-07-26 SKW4654 TYS → ORD Jul 26, 12:50 UTCJul 26, 14:45 UTC1h 55m
2026-07-25 SKW5450 SMF → SFO Jul 25, 21:30 UTCJul 25, 21:40 UTC10m
2026-07-25 SKW5450 SMF → SFO Jul 25, 18:45 UTCJul 25, 21:40 UTC2h 55m
2026-07-25 SKW5450 SMF → SFO Jul 25, 18:43 UTCJul 25, 21:15 UTC2h 32m
2026-07-25 SKW6013 MKE → ORD Jul 25, 14:10 UTCJul 25, 17:05 UTC2h 55m
2026-07-25 SKW6013 MKE → ORD Jul 25, 14:16 UTCJul 25, 17:01 UTC2h 45m
2026-07-25 SKW5265 RDM → SFO Jul 25, 10:15 UTCJul 25, 11:10 UTC55m
2026-07-24 SKW5638 SFO → SMF Jul 24, 21:20 UTCJul 24, 22:15 UTC55m
2026-07-24 SKW5621 OKC → ORD Jul 24, 18:00 UTCJul 24, 20:10 UTC2h 10m
2026-07-24 SKW5621 OKC → ORD Jul 24, 17:54 UTCJul 24, 19:34 UTC1h 40m
2026-07-24 SKW5614 OKC → IAH Jul 24, 14:50 UTCJul 24, 16:45 UTC1h 55m
2026-07-24 SKW5786 LAX → ASE Jul 24, 10:25 UTCJul 24, 12:40 UTC2h 15m
2026-07-24 SKW5442 SEA → SFO Jul 24, 01:15 UTCJul 24, 01:30 UTC15m
2026-07-23 SKW5442 SEA → SFO Jul 23, 23:15 UTCJul 24, 01:30 UTC2h 15m
2026-07-23 SKW5442 SEA → SFO Jul 23, 23:24 UTCJul 24, 00:56 UTC1h 32m
2026-07-23 SKW5780 SAT → IAH Jul 23, 19:30 UTCJul 23, 21:05 UTC1h 35m
2026-07-23 SKW565J ORD → CMX Jul 23, 17:20 UTCJul 23, 18:25 UTC1h 5m
2026-07-23 SKW5259 - Jul 23, 13:00 UTCJul 23, 13:40 UTC40m
2026-07-23 SKW376Z DEN → SHV Jul 23, 03:25 UTCJul 23, 05:15 UTC1h 50m
2026-07-23 SKW376Z DEN → SHV Jul 23, 03:12 UTCJul 23, 05:14 UTC2h 2m
2026-07-23 SKW5846 ORD → SDF Jul 23, 01:00 UTCJul 23, 02:10 UTC1h 10m
2026-07-22 SKW5846 ORD → SDF Jul 22, 20:20 UTCJul 22, 22:50 UTC2h 30m
2026-07-22 SKW4689 LAX → SFO Jul 22, 18:10 UTCJul 22, 19:10 UTC1h 0m
2026-07-22 SKW5725 - Jul 22, 15:45 UTCJul 22, 17:10 UTC1h 25m
2026-07-22 SKW4662 ABE → ORD Jul 22, 04:45 UTCJul 22, 05:25 UTC40m
2026-07-22 SKW5604 SFO → EUG Jul 22, 00:52 UTCJul 22, 01:58 UTC1h 6m
2026-07-22 SKW5604 SFO → EUG Jul 22, 00:50 UTCJul 22, 02:00 UTC1h 10m
2026-07-21 SKW5970 SLC → SFO Jul 21, 22:00 UTCJul 21, 23:40 UTC1h 40m
2026-07-21 SKW420W SFO → SLC Jul 21, 19:10 UTCJul 21, 20:45 UTC1h 35m
2026-07-21 SKW5305 CMH → IAH Jul 21, 07:05 UTCJul 21, 07:50 UTC45m
2026-07-21 SKW5305 CMH → IAH Jul 21, 06:48 UTCJul 21, 07:44 UTC56m
2026-07-21 SKW5480 GRR → ORD Jul 21, 03:00 UTCJul 21, 03:30 UTC30m
2026-07-21 SKW5480 GRR → ORD Jul 21, 03:05 UTCJul 21, 03:39 UTC34m
2026-07-20 SKW5578 - Jul 20, 21:55 UTCJul 20, 23:40 UTC1h 45m
2026-07-20 SKW5578 PSC → SFO Jul 20, 20:53 UTCJul 20, 23:32 UTC2h 39m
2026-07-20 SKW463C DEN → PSC Jul 20, 17:45 UTCJul 20, 19:35 UTC1h 50m
2026-07-20 SKW4692 - Jul 20, 14:45 UTCJul 20, 16:30 UTC1h 45m
2026-07-20 SKW5512 ASE → SFO Jul 20, 01:35 UTCJul 20, 03:05 UTC1h 30m
2026-07-19 SKW5914 - Jul 19, 22:55 UTCJul 20, 00:15 UTC1h 20m
2026-07-19 SKW5311 - Jul 19, 21:00 UTCJul 19, 22:15 UTC1h 15m
2026-07-19 SKW5311 DEN → TUL Jul 19, 21:01 UTCJul 19, 22:15 UTC1h 14m
2026-07-19 SKW5492 FSD → DEN Jul 19, 18:30 UTCJul 19, 19:45 UTC1h 15m
2026-07-19 SKW5492 FSD → DEN Jul 19, 18:34 UTCJul 19, 19:41 UTC1h 7m
2026-07-19 SKW4759 DEN → FSD Jul 19, 16:15 UTCJul 19, 17:35 UTC1h 20m
2026-07-19 SKW5411 - Jul 19, 12:40 UTCJul 19, 14:20 UTC1h 40m
2026-07-19 SKW4787 - Jul 19, 01:35 UTCJul 19, 03:10 UTC1h 35m
2026-07-18 SKW5393 - Jul 18, 21:20 UTCJul 18, 23:40 UTC2h 20m

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 N87364 page for operator, model, and routing details .

Mode-S AC04C2 frequently asked

What is Mode-S code AC04C2?
AC04C2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N87364.
Where is Mode-S AC04C2 registered?
Mode-S code AC04C2 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 AC04C2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC04C2, octal 53002302, decimal 11,273,410.
What flights does AC04C2 operate?
Mode-S AC04C2 has broadcast 20 distinct callsigns, including SKW5578, SKW5375, SKW5328, SKW463C, SKW5655.