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sensors Mode-S transponder

AC0504

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N87380 · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AC0504
Octal
53002404
Decimal
11,273,476
Country
US
Tail
N87380
Type
E75L
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
660
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AC0504.

Country allocation

The ICAO 24-bit address AC0504 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
SKW5309 SkyWest Airlines 7 2026-06-18
SKW4803 SkyWest Airlines 7 2026-07-26
SKW5668 SkyWest Airlines 6 2026-06-09
SKW5419 SkyWest Airlines 6 2026-07-23
SKW4692 SkyWest Airlines 6 2026-05-06
SKW463C SkyWest Airlines 6 2026-05-22
SKW6044 SkyWest Airlines 5 2026-05-12
SKW6000 - 5 2026-07-20
SKW5997 - 5 2026-06-27
SKW5740 SkyWest Airlines 5 2026-05-12
SKW5665 SkyWest Airlines 5 2026-07-24
SKW5601 - 5 2026-07-21
SKW5512 SkyWest Airlines 5 2026-05-06
SKW5469 SkyWest Airlines 5 2026-07-21
SKW5443 SkyWest Airlines 5 2026-05-20
SKW5217 - 5 2026-06-23
SKW5857 SkyWest Airlines 4 2026-06-13
SKW5729 SkyWest Airlines 4 2026-06-09
SKW5692 SkyWest Airlines 4 2026-05-28
SKW5646 SkyWest Airlines 4 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5552 BUR → SFO Jul 26, 21:45 UTCJul 26, 23:00 UTC1h 15m
2026-07-26 SKW5570 SEA → SFO Jul 26, 18:20 UTCJul 26, 19:20 UTC1h 0m
2026-07-26 SKW5684 ORD → DCA Jul 26, 15:50 UTCJul 26, 16:50 UTC1h 0m
2026-07-26 SKW4803 BUR → SFO Jul 26, 12:50 UTCJul 26, 13:20 UTC30m
2026-07-26 SKW384W ORD → SDF Jul 26, 02:55 UTCJul 26, 03:15 UTC20m
2026-07-25 SKW5702 ASE → ORD Jul 25, 21:10 UTCJul 25, 23:30 UTC2h 20m
2026-07-25 SKW4703 - Jul 25, 16:10 UTCJul 25, 18:10 UTC2h 0m
2026-07-25 SKW4803 BUR → SFO Jul 25, 12:55 UTCJul 25, 13:20 UTC25m
2026-07-25 SKW5362 ORD → PIA Jul 25, 02:45 UTCJul 25, 03:05 UTC20m
2026-07-24 SKW4679 CAK → ORD Jul 24, 23:45 UTCJul 25, 01:00 UTC1h 15m
2026-07-24 SKW4679 CAK → ORD Jul 24, 23:40 UTCJul 25, 00:51 UTC1h 11m
2026-07-24 SKW5665 DEN → SLC Jul 24, 21:30 UTCJul 24, 22:35 UTC1h 5m
2026-07-24 SKW5570 SEA → SFO Jul 24, 18:25 UTCJul 24, 19:25 UTC1h 0m
2026-07-24 SKW5684 - Jul 24, 16:15 UTCJul 24, 17:15 UTC1h 0m
2026-07-24 SKW5265 RDM → SFO Jul 24, 11:50 UTCJul 24, 12:40 UTC50m
2026-07-24 SKW5265 RDM → SFO Jul 24, 12:02 UTCJul 24, 12:38 UTC36m
2026-07-23 SKW5638 SFO → SMF Jul 23, 23:45 UTCJul 24, 00:35 UTC50m
2026-07-23 SKW5419 SBA → SFO Jul 23, 17:50 UTCJul 23, 18:30 UTC40m
2026-07-23 SKW5419 SBA → SFO Jul 23, 17:49 UTCJul 23, 18:09 UTC20m
2026-07-23 SKW5968 - Jul 23, 16:20 UTCJul 23, 16:55 UTC35m
2026-07-23 SKW4803 BUR → SFO Jul 23, 13:05 UTCJul 23, 13:30 UTC25m
2026-07-23 SKW5362 ORD → PIA Jul 23, 02:50 UTCJul 23, 03:15 UTC25m
2026-07-23 SKW4679 CAK → ORD Jul 23, 00:10 UTCJul 23, 01:30 UTC1h 20m
2026-07-22 SKW4679 CAK → ORD Jul 22, 23:58 UTCJul 23, 01:13 UTC1h 15m
2026-07-22 SKW5665 DEN → SLC Jul 22, 21:35 UTCJul 22, 22:40 UTC1h 5m
2026-07-22 SKW5665 DEN → SLC Jul 22, 21:26 UTCJul 22, 22:35 UTC1h 9m
2026-07-22 SKW5621 OKC → ORD Jul 22, 17:55 UTCJul 22, 19:45 UTC1h 50m
2026-07-22 SKW5614 OKC → IAH Jul 22, 15:16 UTCJul 22, 16:28 UTC1h 12m
2026-07-22 SKW5614 OKC → IAH Jul 22, 14:55 UTCJul 22, 16:45 UTC1h 50m
2026-07-22 SKW4728 - Jul 22, 11:25 UTCJul 22, 12:10 UTC45m
2026-07-22 SKW4728 - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 SKW5275 SUN → SFO Jul 22, 00:50 UTCJul 22, 02:25 UTC1h 35m
2026-07-21 SKW5469 DEN → PSP Jul 21, 22:30 UTCJul 21, 23:10 UTC40m
2026-07-21 SKW5469 DEN → PSP Jul 21, 22:45 UTCJul 21, 23:13 UTC28m
2026-07-21 SKW582Y ORD → CVG Jul 21, 20:05 UTCJul 21, 20:35 UTC30m
2026-07-21 SKW4656 - Jul 21, 14:55 UTCJul 21, 17:00 UTC2h 5m
2026-07-21 SKW4656 AVL → ORD Jul 21, 14:57 UTCJul 21, 16:42 UTC1h 45m
2026-07-21 SKW5601 - Jul 21, 12:20 UTCJul 21, 13:25 UTC1h 5m
2026-07-20 SKW6000 - Jul 20, 22:00 UTCJul 20, 23:25 UTC1h 25m
2026-07-20 SKW6000 TYS → ORD Jul 20, 22:07 UTCJul 20, 23:07 UTC1h 0m
2026-07-20 SKW725M ORD → TYS Jul 20, 19:30 UTCJul 20, 20:45 UTC1h 15m
2026-07-20 SKW4788 GEG → SFO Jul 20, 14:35 UTCJul 20, 17:30 UTC2h 55m
2026-07-20 SKW4788 GEG → SFO Jul 20, 14:33 UTCJul 20, 17:13 UTC2h 40m
2026-07-20 SKW6043 LAX → SUN Jul 20, 02:00 UTCJul 20, 03:15 UTC1h 15m
2026-07-19 SKW319U ACV → LAX Jul 19, 23:00 UTCJul 20, 00:25 UTC1h 25m
2026-07-19 SKW789C - Jul 19, 20:05 UTCJul 19, 21:15 UTC1h 10m
2026-07-19 SKW415W - Jul 19, 17:30 UTCJul 19, 18:35 UTC1h 5m
2026-07-19 SKW5220 YYZ → DEN Jul 19, 16:25 UTCJul 19, 16:50 UTC25m
2026-07-19 SKW5738 PHX → SFO Jul 19, 13:25 UTCJul 19, 15:00 UTC1h 35m
2026-07-19 SKW5319 - Jul 19, 06:00 UTCJul 19, 06:55 UTC55m

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 N87380 page for operator, model, and routing details .

Mode-S AC0504 frequently asked

What is Mode-S code AC0504?
AC0504 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N87380.
Where is Mode-S AC0504 registered?
Mode-S code AC0504 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 AC0504 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 AC0504, octal 53002404, decimal 11,273,476.
What flights does AC0504 operate?
Mode-S AC0504 has broadcast 20 distinct callsigns, including SKW5309, SKW4803, SKW5668, SKW5419, SKW4692.