Apparatus

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sensors Mode-S transponder

AD57BB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N959SW · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
AD57BB
Octal
53253673
Decimal
11,360,187
Country
US
Tail
N959SW
Type
CRJ2
No current signal · last broadcast 6d ago
Flights observed
513
Distinct callsigns
20
Country
US
Last broadcast
6d ago

Last known position

Most recent position reported by Mode-S AD57BB.

Country allocation

The ICAO 24-bit address AD57BB 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
SKW5086 - 6 2026-07-20
SKW5072 SkyWest Airlines 6 2026-05-21
SKW5804 SkyWest Airlines 5 2026-06-21
SKW5275 - 5 2026-06-17
SKW5139 SkyWest Airlines 5 2026-07-19
SKW5047 - 5 2026-07-14
SKW5044 SkyWest Airlines 5 2026-06-13
SKW5034 SkyWest Airlines 5 2026-06-07
SKW6078 - 4 2026-06-19
SKW6058 SkyWest Airlines 4 2026-06-07
SKW5927 SkyWest Airlines 4 2026-05-10
SKW5799 SkyWest Airlines 4 2026-07-24
SKW5488 SkyWest Airlines 4 2026-05-23
SKW5141 SkyWest Airlines 4 2026-06-08
SKW5112 - 4 2026-07-16
SKW5110 - 4 2026-07-09
SKW5101 SkyWest Airlines 4 2026-04-24
SKW5069 SkyWest Airlines 4 2026-06-13
SKW5062 - 4 2026-07-14
SKW5058 - 4 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW330Z ORD → SUX Jul 26, 21:10 UTCJul 26, 22:10 UTC1h 0m
2026-07-26 SKW5070 IAH → SLN Jul 26, 19:10 UTCJul 26, 19:55 UTC45m
2026-07-26 SKW5070 IAH → SLN Jul 26, 17:30 UTCJul 26, 17:55 UTC25m
2026-07-26 SKW6055 IAH → VCT Jul 26, 13:20 UTCJul 26, 14:55 UTC1h 35m
2026-07-25 SKW6060 EAR → DEN Jul 25, 22:10 UTCJul 25, 23:35 UTC1h 25m
2026-07-25 SKW5807 PIA → ORD Jul 25, 16:45 UTCJul 25, 17:20 UTC35m
2026-07-25 SKW5949 SFO → SBP Jul 25, 15:25 UTCJul 25, 15:55 UTC30m
2026-07-25 SKW5231 SDF → ORD Jul 25, 12:20 UTCJul 25, 12:40 UTC20m
2026-07-25 SKW5499 PSP → SFO Jul 25, 01:10 UTCJul 25, 01:30 UTC20m
2026-07-24 SKW4698 CVG → ORD Jul 24, 22:15 UTCJul 24, 23:20 UTC1h 5m
2026-07-24 SKW5563 BIH → SFO Jul 24, 20:05 UTCJul 24, 21:05 UTC1h 0m
2026-07-24 SKW5563 BIH → SFO Jul 24, 20:14 UTCJul 24, 20:58 UTC44m
2026-07-24 SKW5263 SAT → SFO Jul 24, 15:20 UTCJul 24, 17:05 UTC1h 45m
2026-07-24 SKW5446 SFO → SBP Jul 24, 12:40 UTCJul 24, 14:10 UTC1h 30m
2026-07-24 SKW5799 IAH → SAT Jul 24, 10:30 UTCJul 24, 10:55 UTC25m
2026-07-24 SKW5799 IAH → SAT Jul 24, 10:31 UTCJul 24, 10:56 UTC25m
2026-07-24 SKW478V ORD → MKE Jul 24, 00:30 UTCJul 24, 00:50 UTC20m
2026-07-23 SKW4718 FAT → SFO Jul 23, 21:50 UTCJul 23, 23:10 UTC1h 20m
2026-07-23 SKW5244 ORD → TUL Jul 23, 19:55 UTCJul 23, 21:05 UTC1h 10m
2026-07-23 SKW5320 ORD → MKE Jul 23, 17:40 UTCJul 23, 18:25 UTC45m
2026-07-23 SKW5839 BFL → DEN Jul 23, 16:05 UTCJul 23, 16:40 UTC35m
2026-07-23 SKW4639 BIH → SFO Jul 23, 11:25 UTCJul 23, 12:15 UTC50m
2026-07-22 SKW4772 DEN → TYS Jul 22, 23:40 UTCJul 23, 00:20 UTC40m
2026-07-22 SKW5335 PNS → DEN Jul 22, 20:05 UTCJul 22, 21:30 UTC1h 25m
2026-07-22 SKW5282 ORD → MSN Jul 22, 17:45 UTCJul 22, 19:00 UTC1h 15m
2026-07-22 SKW5282 ORD → MSN Jul 22, 17:42 UTCJul 22, 19:00 UTC1h 18m
2026-07-20 SKW6066 ORD → DEC Jul 20, 17:30 UTCJul 20, 18:25 UTC55m
2026-07-20 SKW535G IAH → MEI Jul 20, 14:55 UTCJul 20, 15:50 UTC55m
2026-07-20 SKW5086 CHA → IAH Jul 20, 11:16 UTCJul 20, 12:35 UTC1h 19m
2026-07-20 SKW5086 - Jul 20, 11:00 UTCJul 20, 12:35 UTC1h 35m
2026-07-20 SKW5094 ORD → FOD Jul 20, 03:10 UTCJul 20, 05:10 UTC2h 0m
2026-07-19 SKW5073 IAH → VCT Jul 19, 22:35 UTCJul 19, 23:05 UTC30m
2026-07-19 SKW459L IAH → VCT Jul 19, 21:05 UTCJul 19, 21:25 UTC20m
2026-07-19 SKW5139 SLN → ORD Jul 19, 19:25 UTCJul 19, 20:05 UTC40m
2026-07-19 SKW5086 - Jul 19, 17:05 UTCJul 19, 17:40 UTC35m
2026-07-19 SKW5086 IAH → HEZ Jul 19, 17:13 UTCJul 19, 17:41 UTC28m
2026-07-19 SKW5347 SNA → SFO Jul 19, 15:00 UTCJul 19, 15:40 UTC40m
2026-07-19 SKW4682 CVG → ORD Jul 19, 01:10 UTCJul 19, 01:45 UTC35m
2026-07-18 SKW5045 ORD → MGW Jul 18, 22:15 UTCJul 18, 23:35 UTC1h 20m
2026-07-18 SKW5045 ORD → MGW Jul 18, 21:59 UTCJul 18, 23:29 UTC1h 30m
2026-07-18 SKW524C - Jul 18, 19:45 UTCJul 18, 21:00 UTC1h 15m
2026-07-18 SKW788P - Jul 18, 17:15 UTCJul 18, 18:00 UTC45m
2026-07-18 SKW425P - Jul 18, 14:30 UTCJul 18, 15:40 UTC1h 10m
2026-07-18 SKW5576 ORD → LNK Jul 18, 11:55 UTCJul 18, 12:30 UTC35m
2026-07-18 SKW5225 DEN → RAP Jul 18, 00:16 UTCJul 18, 01:10 UTC54m
2026-07-18 SKW5225 - Jul 18, 00:15 UTCJul 18, 00:45 UTC30m
2026-07-17 SKW5952 - Jul 17, 22:20 UTCJul 17, 23:10 UTC50m
2026-07-17 SKW5224 - Jul 17, 20:00 UTCJul 17, 20:40 UTC40m
2026-07-17 SKW5224 DEN → DRO Jul 17, 19:45 UTCJul 17, 20:45 UTC1h 0m
2026-07-17 SKW4736 - Jul 17, 16:10 UTCJul 17, 16:55 UTC45m

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 N959SW page for operator, model, and routing details .

Mode-S AD57BB frequently asked

What is Mode-S code AD57BB?
AD57BB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N959SW.
Where is Mode-S AD57BB registered?
Mode-S code AD57BB 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 AD57BB broadcasting right now?
No active broadcast right now. Last signal was 6d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD57BB, octal 53253673, decimal 11,360,187.
What flights does AD57BB operate?
Mode-S AD57BB has broadcast 20 distinct callsigns, including SKW5086, SKW5072, SKW5804, SKW5275, SKW5139.