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sensors Mode-S transponder

AD504D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N957SW · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
AD504D
Octal
53250115
Decimal
11,358,285
Country
US
Tail
N957SW
Type
CRJ2
No current signal · last broadcast Jul 26, 20:50 UTC
Flights observed
656
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

Last known position

Most recent position reported by Mode-S AD504D.

Country allocation

The ICAO 24-bit address AD504D 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
SKW5910 - 9 2026-07-17
SKW5079 SkyWest Airlines 8 2026-06-10
SKW5100 - 7 2026-07-10
SKW5096 SkyWest Airlines 7 2026-04-21
SKW6079 - 6 2026-06-16
SKW6067 - 6 2026-06-25
SKW6065 - 6 2026-07-09
SKW592J SkyWest Airlines 6 2026-06-13
SKW5127 SkyWest Airlines 6 2026-04-24
SKW5113 SkyWest Airlines 6 2026-05-28
SKW5090 - 6 2026-07-05
SKW5682 SkyWest Airlines 5 2026-06-16
SKW5634 - 5 2026-06-16
SKW5246 SkyWest Airlines 5 2026-06-16
SKW5089 - 5 2026-07-07
SKW5062 - 5 2026-06-17
SKW5041 SkyWest Airlines 5 2026-07-25
SKW5024 - 5 2026-07-01
SKW5023 - 5 2026-07-06
SKW4788 SkyWest Airlines 5 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5034 SGU → LAX Jul 26, 19:05 UTCJul 26, 20:50 UTC1h 45m
2026-07-26 SKW5075 MCW → ORD Jul 26, 16:40 UTCJul 26, 18:10 UTC1h 30m
2026-07-26 SKW5071 SUX → ORD Jul 26, 13:15 UTCJul 26, 14:25 UTC1h 10m
2026-07-25 SKW330Z ORD → SUX Jul 25, 21:25 UTCJul 25, 22:30 UTC1h 5m
2026-07-25 SKW5065 MEI → IAH Jul 25, 14:25 UTCJul 25, 15:45 UTC1h 20m
2026-07-25 SKW5038 PLN → ORD Jul 25, 12:35 UTCJul 25, 13:10 UTC35m
2026-07-25 SKW5038 PLN → ORD Jul 25, 12:36 UTCJul 25, 13:06 UTC30m
2026-07-25 SKW5025 DEN → PRC Jul 25, 11:10 UTCJul 25, 11:35 UTC25m
2026-07-25 SKW5118 VCT → IAH Jul 25, 02:50 UTCJul 25, 03:25 UTC35m
2026-07-25 SKW5118 VCT → IAH Jul 25, 02:49 UTCJul 25, 03:12 UTC23m
2026-07-25 SKW5041 IAD → OGS Jul 25, 00:30 UTCJul 25, 01:05 UTC35m
2026-07-24 SKW5067 SGU → DEN Jul 24, 22:25 UTCJul 24, 23:45 UTC1h 20m
2026-07-24 SKW6059 DEN → LBL Jul 24, 18:30 UTCJul 24, 19:30 UTC1h 0m
2026-07-24 SKW6069 VCT → IAH Jul 24, 17:00 UTCJul 24, 17:35 UTC35m
2026-07-24 SKW6069 VCT → IAH Jul 24, 16:56 UTCJul 24, 18:02 UTC1h 6m
2026-07-23 SKW6013 MKE → ORD Jul 23, 23:45 UTCJul 24, 00:55 UTC1h 10m
2026-07-23 SKW6013 MKE → ORD Jul 23, 23:37 UTCJul 24, 00:39 UTC1h 2m
2026-07-23 SKW503C ORD → DLH Jul 23, 21:00 UTCJul 23, 22:00 UTC1h 0m
2026-07-23 SKW6022 PIA → ORD Jul 23, 18:40 UTCJul 23, 19:15 UTC35m
2026-07-23 SKW5733 HRL → DEN Jul 23, 17:01 UTCJul 23, 17:20 UTC19m
2026-07-23 SKW5733 HRL → DEN Jul 23, 16:45 UTCJul 23, 17:15 UTC30m
2026-07-23 SKW5997 PSP → SFO Jul 23, 13:35 UTCJul 23, 14:05 UTC30m
2026-07-23 SKW5997 PSP → SFO Jul 23, 13:35 UTCJul 23, 14:03 UTC28m
2026-07-22 SKW578A ORD → DEC Jul 22, 23:50 UTCJul 23, 00:20 UTC30m
2026-07-22 SKW4718 FAT → SFO Jul 22, 20:40 UTCJul 22, 22:00 UTC1h 20m
2026-07-22 SKW5244 ORD → TUL Jul 22, 18:10 UTCJul 22, 19:40 UTC1h 30m
2026-07-22 SKW5244 ORD → TUL Jul 22, 18:11 UTCJul 22, 19:37 UTC1h 26m
2026-07-22 SKW6058 DEN → LBF Jul 22, 15:05 UTCJul 22, 16:10 UTC1h 5m
2026-07-22 SKW6058 DEN → LBF Jul 22, 15:02 UTCJul 22, 15:54 UTC52m
2026-07-21 SKW364V ORD → PLN Jul 21, 22:05 UTCJul 21, 22:35 UTC30m
2026-07-21 SKW6059 DEN → LBL Jul 21, 18:40 UTCJul 21, 19:40 UTC1h 0m
2026-07-21 SKW6069 VCT → IAH Jul 21, 17:05 UTCJul 21, 17:40 UTC35m
2026-07-21 SKW4639 BIH → SFO Jul 21, 11:45 UTCJul 21, 12:25 UTC40m
2026-07-21 SKW4639 BIH → SFO Jul 21, 11:43 UTCJul 21, 12:13 UTC30m
2026-07-21 SKW4772 DEN → TYS Jul 21, 00:45 UTCJul 21, 01:20 UTC35m
2026-07-20 SKW5335 PNS → DEN Jul 20, 21:45 UTCJul 20, 21:50 UTC5m
2026-07-20 SKW5335 PNS → DEN Jul 20, 20:05 UTCJul 20, 21:50 UTC1h 45m
2026-07-20 SKW5335 PNS → DEN Jul 20, 20:00 UTCJul 20, 21:28 UTC1h 28m
2026-07-20 SKW5282 ORD → MSN Jul 20, 17:35 UTCJul 20, 18:55 UTC1h 20m
2026-07-20 SKW5110 PIB → IAH Jul 20, 15:00 UTCJul 20, 15:35 UTC35m
2026-07-20 SKW5110 PIB → IAH Jul 20, 14:54 UTCJul 20, 15:31 UTC37m
2026-07-20 SKW403G IAH → AEX Jul 20, 00:05 UTCJul 20, 00:25 UTC20m
2026-07-19 SKW5327 SBA → SFO Jul 19, 20:35 UTCJul 19, 22:05 UTC1h 30m
2026-07-19 SKW5691 SFO → BUR Jul 19, 18:15 UTCJul 19, 19:40 UTC1h 25m
2026-07-19 SKW5065 - Jul 19, 14:55 UTCJul 19, 16:30 UTC1h 35m
2026-07-19 SKW5065 LYH → ORD Jul 19, 15:00 UTCJul 19, 16:14 UTC1h 14m
2026-07-19 SKW5038 - Jul 19, 12:30 UTCJul 19, 13:00 UTC30m
2026-07-19 SKW5046 IAD → JST Jul 19, 10:55 UTCJul 19, 11:15 UTC20m
2026-07-19 SKW5046 IAD → JST Jul 19, 10:55 UTCJul 19, 11:21 UTC26m
2026-07-19 SKW572U ORD → JST Jul 19, 04:10 UTCJul 19, 04:54 UTC44m

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 N957SW page for operator, model, and routing details .

Mode-S AD504D frequently asked

What is Mode-S code AD504D?
AD504D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N957SW.
Where is Mode-S AD504D registered?
Mode-S code AD504D 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 AD504D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD504D, octal 53250115, decimal 11,358,285.
What flights does AD504D operate?
Mode-S AD504D has broadcast 20 distinct callsigns, including SKW5910, SKW5079, SKW5100, SKW5096, SKW6079.