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 2h ago
Flights observed
310
Distinct callsigns
20
Country
US
Last broadcast
2h 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
SKW5072 SkyWest Airlines 6 2026-05-21
SKW5044 SkyWest Airlines 5 2026-06-13
SKW5034 SkyWest Airlines 5 2026-06-07
SKW6058 SkyWest Airlines 4 2026-06-07
SKW5927 SkyWest Airlines 4 2026-05-10
SKW5488 SkyWest Airlines 4 2026-05-23
SKW5141 SkyWest Airlines 4 2026-06-08
SKW5139 SkyWest Airlines 4 2026-06-01
SKW5101 SkyWest Airlines 4 2026-04-24
SKW5069 SkyWest Airlines 4 2026-06-13
SKW5053 SkyWest Airlines 4 2026-05-25
SKW484C SkyWest Airlines 4 2026-05-31
SKW5959 - 3 2026-06-16
SKW5456 SkyWest Airlines 3 2026-05-10
SKW5380 SkyWest Airlines 3 2026-06-06
SKW5275 SkyWest Airlines 3 2026-06-03
SKW5136 SkyWest Airlines 3 2026-06-14
SKW5130 SkyWest Airlines 3 2026-05-17
SKW5116 SkyWest Airlines 3 2026-05-16
SKW5080 SkyWest Airlines 3 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-16 SKW5959 - Jun 16, 01:40 UTCJun 16, 02:15 UTC35m
2026-06-16 SKW6026 IAH → SHV Jun 16, 00:20 UTCJun 16, 00:55 UTC35m
2026-06-15 SKW5086 - Jun 15, 19:10 UTCJun 15, 20:59 UTC1h 50m
2026-06-15 SKW342K IAH → MEI Jun 15, 16:15 UTCJun 15, 17:04 UTC50m
2026-06-15 SKW5088 MEI → IAH Jun 15, 13:40 UTCJun 15, 14:45 UTC1h 5m
2026-06-15 SKW5088 MEI → IAH Jun 15, 13:30 UTCJun 15, 14:40 UTC1h 10m
2026-06-14 SKW730C IAH → MEI Jun 14, 22:45 UTCJun 14, 23:29 UTC44m
2026-06-14 SKW5136 PIB → IAH Jun 14, 20:25 UTCJun 14, 21:25 UTC1h 0m
2026-06-14 SKW5136 PIB → IAH Jun 14, 20:07 UTCJun 14, 21:19 UTC1h 12m
2026-06-14 SKW5136 PIB → IAH Jun 14, 18:10 UTCJun 14, 19:05 UTC55m
2026-06-14 SKW5110 PIB → IAH Jun 14, 15:15 UTCJun 14, 15:40 UTC25m
2026-06-14 SKW5110 PIB → IAH Jun 14, 14:54 UTCJun 14, 15:44 UTC50m
2026-06-14 SKW420C IAH → AEX Jun 14, 00:00 UTCJun 14, 00:25 UTC25m
2026-06-13 SKW5044 PBG → IAD Jun 13, 21:10 UTCJun 13, 21:45 UTC35m
2026-06-13 SKW5044 PBG → IAD Jun 13, 21:19 UTCJun 13, 21:45 UTC26m
2026-06-13 SKW5044 PBG → IAD Jun 13, 18:50 UTCJun 13, 19:05 UTC15m
2026-06-13 SKW5069 SLN → IAH Jun 13, 15:15 UTCJun 13, 16:50 UTC1h 35m
2026-06-13 SKW5069 SLN → IAH Jun 13, 15:23 UTCJun 13, 16:55 UTC1h 32m
2026-06-12 SKW730V ORD → SLN Jun 12, 22:40 UTCJun 13, 00:10 UTC1h 30m
2026-06-12 SKW5134 ORD → DEC Jun 12, 19:55 UTCJun 12, 21:15 UTC1h 20m
2026-06-12 SKW5134 ORD → DEC Jun 12, 19:18 UTCJun 12, 20:58 UTC1h 40m
2026-06-12 SKW440U SFO → SBP Jun 12, 18:20 UTCJun 12, 18:55 UTC35m
2026-06-12 SKW435T BOI → SFO Jun 12, 16:40 UTCJun 12, 17:10 UTC30m
2026-06-12 SKW767U ORD → LYH Jun 12, 02:30 UTCJun 12, 04:30 UTC2h 0m
2026-06-11 SKW5027 DEC → ORD Jun 11, 14:50 UTCJun 11, 15:25 UTC35m
2026-06-11 SKW5027 DEC → ORD Jun 11, 13:05 UTCJun 11, 13:30 UTC25m
2026-06-11 SKW4728 COU → ORD Jun 11, 10:25 UTCJun 11, 11:15 UTC50m
2026-06-11 SKW4742 ELP → ORD Jun 11, 03:10 UTCJun 11, 03:50 UTC40m
2026-06-11 SKW4742 ELP → ORD Jun 11, 03:03 UTCJun 11, 03:46 UTC43m
2026-06-11 SKW4644 CLT → DEN Jun 11, 00:15 UTCJun 11, 01:30 UTC1h 15m
2026-06-10 SKW5804 RNO → SFO Jun 10, 20:25 UTCJun 10, 21:35 UTC1h 10m
2026-06-10 SKW5953 SFO → SBA Jun 10, 16:05 UTCJun 10, 16:45 UTC40m
2026-06-10 SKW5887 BUR → SFO Jun 10, 14:35 UTCJun 10, 14:55 UTC20m
2026-06-09 SKW5361 SLC → SFO Jun 9, 22:10 UTCJun 9, 23:50 UTC1h 40m
2026-06-09 SKW567L ORD → SCE Jun 9, 19:35 UTCJun 9, 20:40 UTC1h 5m
2026-06-09 SKW567L ORD → SCE Jun 9, 19:40 UTCJun 9, 20:50 UTC1h 10m
2026-06-09 SKW5213 ORD → LEX Jun 9, 14:15 UTCJun 9, 15:15 UTC1h 0m
2026-06-08 SKW457T ORD → SAV Jun 8, 23:30 UTCJun 9, 00:35 UTC1h 5m
2026-06-08 SKW5141 DEN → SGU Jun 8, 19:55 UTCJun 8, 21:25 UTC1h 30m
2026-06-07 SKW5034 SGU → LAX Jun 7, 23:45 UTCJun 8, 00:25 UTC40m
2026-06-07 SKW5034 SGU → LAX Jun 7, 22:18 UTCJun 8, 00:29 UTC2h 11m
2026-06-07 SKW6058 DEN → LBF Jun 7, 19:30 UTCJun 7, 20:30 UTC1h 0m
2026-06-07 SKW6058 DEN → LBF Jun 7, 17:40 UTCJun 7, 18:15 UTC35m
2026-06-06 SKW5372 BUR → SFO Jun 6, 20:05 UTCJun 6, 21:35 UTC1h 30m
2026-06-06 SKW5380 SLC → SFO Jun 6, 17:44 UTCJun 6, 19:04 UTC1h 20m
2026-06-06 SKW5380 SLC → SFO Jun 6, 17:39 UTCJun 6, 19:02 UTC1h 23m
2026-06-06 SKW4699 BZN → SFO Jun 6, 12:24 UTCJun 6, 13:25 UTC1h 0m
2026-06-06 SKW323G IAH → LIT Jun 6, 01:25 UTCJun 6, 02:15 UTC50m
2026-06-05 SKW5959 BZN → DEN Jun 5, 23:25 UTCJun 6, 00:10 UTC45m
2026-06-05 SKW5959 BZN → DEN Jun 5, 23:29 UTCJun 6, 00:04 UTC35m

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 2h 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 SKW5072, SKW5044, SKW5034, SKW6058, SKW5927.