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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 1d ago
Flights observed
577
Distinct callsigns
20
Country
US
Last broadcast
1d ago

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
SKW5079 SkyWest Airlines 8 2026-06-10
SKW5910 - 7 2026-06-23
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
SKW5024 - 5 2026-07-01
SKW5023 - 5 2026-07-06
SKW4788 SkyWest Airlines 5 2026-05-06
SKW448V SkyWest Airlines 5 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SKW503C ORD → DLH Jul 13, 22:00 UTCJul 13, 22:50 UTC50m
2026-07-13 SKW503C - Jul 13, 21:55 UTCJul 13, 22:50 UTC55m
2026-07-13 SKW4747 - Jul 13, 18:30 UTCJul 13, 19:15 UTC45m
2026-07-13 SKW727R - Jul 13, 16:50 UTCJul 13, 17:40 UTC50m
2026-07-13 SKW5027 - Jul 13, 14:35 UTCJul 13, 15:10 UTC35m
2026-07-13 SKW598C - Jul 13, 13:00 UTCJul 13, 13:25 UTC25m
2026-07-13 SKW4714 - Jul 13, 10:45 UTCJul 13, 11:30 UTC45m
2026-07-12 SKW5258 ORD → FNT Jul 12, 23:45 UTCJul 13, 00:25 UTC40m
2026-07-12 SKW5675 - Jul 12, 21:20 UTCJul 12, 21:50 UTC30m
2026-07-12 SKW5675 SBN → ORD Jul 12, 21:13 UTCJul 12, 21:35 UTC22m
2026-07-12 SKW376K - Jul 12, 19:35 UTCJul 12, 20:20 UTC45m
2026-07-12 SKW5953 - Jul 12, 16:01 UTCJul 12, 16:40 UTC40m
2026-07-12 SKW5887 - Jul 12, 14:15 UTCJul 12, 14:35 UTC20m
2026-07-12 SKW5432 - Jul 12, 11:20 UTCJul 12, 12:35 UTC1h 15m
2026-07-12 SKW5314 ORD → LNK Jul 12, 01:45 UTCJul 12, 02:55 UTC1h 10m
2026-07-12 SKW5314 ORD → LNK Jul 12, 01:28 UTCJul 12, 02:50 UTC1h 22m
2026-07-11 SKW4808 PIA → ORD Jul 11, 23:05 UTCJul 11, 23:42 UTC37m
2026-07-11 SKW394J - Jul 11, 21:40 UTCJul 11, 22:10 UTC30m
2026-07-11 SKW5653 - Jul 11, 00:45 UTCJul 11, 01:15 UTC30m
2026-07-10 SKW5555 - Jul 10, 23:30 UTCJul 10, 23:50 UTC20m
2026-07-10 SKW5675 - Jul 10, 20:55 UTCJul 10, 21:25 UTC30m
2026-07-10 SKW376K ORD → SBN Jul 10, 19:34 UTCJul 10, 19:57 UTC23m
2026-07-10 SKW5100 - Jul 10, 17:00 UTCJul 10, 18:05 UTC1h 5m
2026-07-10 SKW5100 FOD → ORD Jul 10, 16:44 UTCJul 10, 17:38 UTC54m
2026-07-10 SKW5119 - Jul 10, 13:45 UTCJul 10, 15:00 UTC1h 15m
2026-07-10 SKW5087 - Jul 10, 11:40 UTCJul 10, 12:20 UTC40m
2026-07-10 SKW546Y - Jul 10, 04:40 UTCJul 10, 05:15 UTC35m
2026-07-10 SKW546Y DEN → FMN Jul 10, 04:42 UTCJul 10, 05:26 UTC44m
2026-07-10 SKW4650 - Jul 10, 02:35 UTCJul 10, 03:20 UTC45m
2026-07-09 SKW4734 - Jul 9, 23:20 UTCJul 10, 00:10 UTC50m
2026-07-09 SKW4734 DEN → BIS Jul 9, 22:57 UTCJul 10, 00:42 UTC1h 45m
2026-07-09 SKW6065 - Jul 9, 20:35 UTCJul 9, 21:40 UTC1h 5m
2026-07-09 SKW6065 RIW → DEN Jul 9, 20:33 UTCJul 9, 21:34 UTC1h 1m
2026-07-09 SKW6065 - Jul 9, 18:35 UTCJul 9, 19:15 UTC40m
2026-07-09 SKW4764 - Jul 9, 16:35 UTCJul 9, 17:10 UTC35m
2026-07-09 SKW4790 - Jul 9, 14:40 UTCJul 9, 15:05 UTC25m
2026-07-09 SKW5391 COS → DEN Jul 9, 05:00 UTCJul 9, 05:25 UTC25m
2026-07-09 SKW4744 DEN → COS Jul 9, 03:40 UTCJul 9, 04:00 UTC20m
2026-07-09 SKW4744 DEN → COS Jul 9, 02:54 UTCJul 9, 03:55 UTC1h 1m
2026-07-09 SKW790J - Jul 9, 00:05 UTCJul 9, 01:20 UTC1h 15m
2026-07-08 SKW394P - Jul 8, 21:00 UTCJul 8, 21:55 UTC55m
2026-07-08 SKW376U - Jul 8, 19:25 UTCJul 8, 20:15 UTC50m
2026-07-08 SKW474E - Jul 8, 14:40 UTCJul 8, 15:30 UTC50m
2026-07-07 SKW453A DEN → DEN Jul 7, 22:50 UTCJul 8, 12:40 UTC13h 50m
2026-07-07 SKW5099 - Jul 7, 20:40 UTCJul 7, 21:15 UTC35m
2026-07-07 SKW5099 COD → DEN Jul 7, 20:10 UTCJul 7, 21:12 UTC1h 2m
2026-07-07 SKW5089 DEN → COD Jul 7, 18:03 UTCJul 7, 19:07 UTC1h 4m
2026-07-07 SKW5089 - Jul 7, 18:00 UTCJul 7, 18:35 UTC35m
2026-07-07 SKW4631 - Jul 7, 15:45 UTCJul 7, 16:25 UTC40m
2026-07-07 SKW4771 - Jul 7, 14:00 UTCJul 7, 14:40 UTC40m

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 1d ago.
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 SKW5079, SKW5910, SKW5100, SKW5096, SKW6079.