Apparatus

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sensors Mode-S transponder

AA55B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N765SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKY WEST AIRLINES INC

Hex
AA55B5
Octal
52452665
Decimal
11,163,061
Country
US
Tail
N765SK
Type
CRJ7
No current signal · last broadcast Jul 26, 19:35 UTC
Flights observed
788
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:35 UTC

Last known position

Most recent position reported by Mode-S AA55B5.

Country allocation

The ICAO 24-bit address AA55B5 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
SKW6228 - 13 2026-07-22
SKW4969 SkyWest Airlines 10 2026-07-24
SKW4942 SkyWest Airlines 10 2026-07-26
SKW6240 - 9 2026-06-28
SKW4832 SkyWest Airlines 9 2026-07-22
SKW6445 SkyWest Airlines 8 2026-05-21
SKW4986 SkyWest Airlines 8 2026-06-07
SKW6420 SkyWest Airlines 7 2026-05-10
SKW6380 SkyWest Airlines 7 2026-07-25
SKW6373 SkyWest Airlines 7 2026-06-07
SKW6365 SkyWest Airlines 7 2026-05-06
SKW6354 SkyWest Airlines 7 2026-07-19
SKW6352 - 7 2026-07-11
SKW6237 SkyWest Airlines 7 2026-05-07
SKW5003 - 7 2026-07-12
SKW4992 - 7 2026-06-29
SKW4950 SkyWest Airlines 7 2026-07-25
SKW4827 - 7 2026-07-10
SKW6474 SkyWest Airlines 6 2026-06-03
SKW6466 SkyWest Airlines 6 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4989 DFW → CVG Jul 26, 18:25 UTCJul 26, 19:35 UTC1h 10m
2026-07-26 SKW4989 DFW → CVG Jul 26, 15:50 UTCJul 26, 17:00 UTC1h 10m
2026-07-26 SKW4952 SEA → PHX Jul 26, 12:15 UTCJul 26, 13:20 UTC1h 5m
2026-07-26 SKW4942 DAY → ORD Jul 26, 03:55 UTCJul 26, 05:25 UTC1h 30m
2026-07-26 SKW6438 DAY → ORD Jul 26, 00:35 UTCJul 26, 02:00 UTC1h 25m
2026-07-25 SKW6438 DAY → ORD Jul 25, 22:20 UTCJul 25, 23:40 UTC1h 20m
2026-07-25 SKW4950 PHX → SFO Jul 25, 19:55 UTCJul 25, 20:45 UTC50m
2026-07-25 SKW4950 PHX → SFO Jul 25, 18:05 UTCJul 25, 18:55 UTC50m
2026-07-25 SKW4997 DFW → MAF Jul 25, 15:10 UTCJul 25, 16:05 UTC55m
2026-07-25 SKW4997 DFW → MAF Jul 25, 13:25 UTCJul 25, 14:10 UTC45m
2026-07-25 SKW6223 SAT → LAX Jul 25, 10:20 UTCJul 25, 11:25 UTC1h 5m
2026-07-25 SKW6222 LAX → SFO Jul 25, 03:05 UTCJul 25, 03:55 UTC50m
2026-07-25 SKW6222 LAX → SFO Jul 25, 03:01 UTCJul 25, 03:57 UTC56m
2026-07-25 SKW6380 OKC → ORD Jul 25, 00:05 UTCJul 25, 01:15 UTC1h 10m
2026-07-24 SKW6380 OKC → ORD Jul 24, 22:25 UTCJul 24, 23:00 UTC35m
2026-07-24 SKW6407 BFL → PHX Jul 24, 19:35 UTCJul 24, 20:22 UTC47m
2026-07-24 SKW6407 BFL → PHX Jul 24, 19:25 UTCJul 24, 20:35 UTC1h 10m
2026-07-24 SKW6407 BFL → PHX Jul 24, 17:20 UTCJul 24, 18:25 UTC1h 5m
2026-07-24 SKW4969 DFW → LRD Jul 24, 14:40 UTCJul 24, 15:40 UTC1h 0m
2026-07-24 SKW4969 DFW → LRD Jul 24, 14:30 UTCJul 24, 15:21 UTC51m
2026-07-24 SKW4969 DFW → LRD Jul 24, 13:00 UTCJul 24, 13:50 UTC50m
2026-07-24 SKW6358 MKE → ORD Jul 24, 10:35 UTCJul 24, 11:05 UTC30m
2026-07-24 SKW6358 MKE → ORD Jul 24, 10:33 UTCJul 24, 11:00 UTC27m
2026-07-24 SKW4941 PHX → MRY Jul 24, 00:20 UTCJul 24, 00:40 UTC20m
2026-07-24 SKW4941 PHX → MRY Jul 24, 00:19 UTCJul 24, 00:44 UTC25m
2026-07-23 SKW4987 ORD → CVG Jul 23, 22:10 UTCJul 23, 22:55 UTC45m
2026-07-23 SKW4987 ORD → CVG Jul 23, 20:30 UTCJul 23, 21:05 UTC35m
2026-07-23 SKW6488 ORD → YYZ Jul 23, 16:09 UTCJul 23, 16:49 UTC40m
2026-07-23 SKW6488 ORD → YYZ Jul 23, 15:55 UTCJul 23, 17:10 UTC1h 15m
2026-07-23 SKW6488 ORD → YYZ Jul 23, 13:55 UTCJul 23, 14:55 UTC1h 0m
2026-07-23 SKW4914 ORD → RIC Jul 23, 11:50 UTCJul 23, 12:20 UTC30m
2026-07-23 SKW4914 ORD → RIC Jul 23, 11:48 UTCJul 23, 12:14 UTC26m
2026-07-23 SKW4941 PHX → MRY Jul 23, 00:20 UTCJul 23, 00:40 UTC20m
2026-07-22 SKW4833 LWB → ORD Jul 22, 20:30 UTCJul 22, 21:55 UTC1h 25m
2026-07-22 SKW4833 LWB → ORD Jul 22, 20:23 UTCJul 22, 21:44 UTC1h 21m
2026-07-22 SKW4830 CLT → LWB Jul 22, 19:05 UTCJul 22, 19:35 UTC30m
2026-07-22 SKW6228 - Jul 22, 16:35 UTCJul 22, 17:15 UTC40m
2026-07-22 SKW6228 LIT → CLT Jul 22, 16:28 UTCJul 22, 17:53 UTC1h 25m
2026-07-22 SKW6228 - Jul 22, 14:10 UTCJul 22, 15:35 UTC1h 25m
2026-07-22 SKW4832 ORD → SHD Jul 22, 01:20 UTCJul 22, 02:25 UTC1h 5m
2026-07-21 SKW4909 CVG → ORD Jul 21, 22:40 UTCJul 21, 23:40 UTC1h 0m
2026-07-21 SKW4909 CVG → ORD Jul 21, 20:35 UTCJul 21, 21:25 UTC50m
2026-07-21 SKW4989 DFW → CVG Jul 21, 17:20 UTCJul 21, 18:30 UTC1h 10m
2026-07-21 SKW4989 DFW → CVG Jul 21, 17:18 UTCJul 21, 18:27 UTC1h 9m
2026-07-21 SKW4989 DFW → CVG Jul 21, 15:05 UTCJul 21, 16:25 UTC1h 20m
2026-07-21 SKW6251 PHX → SLC Jul 21, 11:05 UTCJul 21, 13:25 UTC2h 20m
2026-07-21 SKW6251 PHX → SLC Jul 21, 11:01 UTCJul 21, 13:02 UTC2h 1m
2026-07-21 SKW4943 PIA → ORD Jul 21, 02:30 UTCJul 21, 04:00 UTC1h 30m
2026-07-20 SKW6230 - Jul 20, 23:20 UTCJul 21, 00:30 UTC1h 9m
2026-07-20 SKW6230 - Jul 20, 21:35 UTCJul 20, 22:20 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 N765SK page for operator, model, and routing details .

Mode-S AA55B5 frequently asked

What is Mode-S code AA55B5?
AA55B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N765SK.
Where is Mode-S AA55B5 registered?
Mode-S code AA55B5 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 AA55B5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 19:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA55B5, octal 52452665, decimal 11,163,061.
What flights does AA55B5 operate?
Mode-S AA55B5 has broadcast 20 distinct callsigns, including SKW6228, SKW4969, SKW4942, SKW6240, SKW4832.