Apparatus

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sensors Mode-S transponder

AA51FE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N764SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
AA51FE
Octal
52450776
Decimal
11,162,110
Country
US
Tail
N764SK
Type
CRJ7
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
696
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S AA51FE.

Country allocation

The ICAO 24-bit address AA51FE 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
SKW4994 SkyWest Airlines 12 2026-04-23
SKW6194 SkyWest Airlines 10 2026-07-26
SKW6229 SkyWest Airlines 9 2026-05-22
SKW6399 - 8 2026-07-08
SKW6337 - 8 2026-07-21
SKW6208 SkyWest Airlines 8 2026-06-05
SKW6513 - 7 2026-06-22
SKW6446 SkyWest Airlines 7 2026-07-25
SKW6414 SkyWest Airlines 7 2026-07-23
SKW6340 - 7 2026-07-02
SKW6284 SkyWest Airlines 7 2026-04-24
SKW6236 SkyWest Airlines 7 2026-05-31
SKW4965 SkyWest Airlines 7 2026-07-24
SKW4954 SkyWest Airlines 7 2026-06-07
SKW6421 SkyWest Airlines 6 2026-07-23
SKW6413 SkyWest Airlines 6 2026-05-01
SKW6197 - 6 2026-07-12
SKW4984 - 6 2026-07-10
SKW6517 SkyWest Airlines 5 2026-04-23
SKW6459 - 5 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4960 TUL → PHX Jul 26, 20:40 UTCJul 26, 21:30 UTC50m
2026-07-26 SKW6194 LAX → OKC Jul 26, 17:45 UTCJul 26, 19:20 UTC1h 35m
2026-07-26 SKW6194 LAX → OKC Jul 26, 17:41 UTCJul 26, 19:19 UTC1h 38m
2026-07-26 SKW6194 LAX → OKC Jul 26, 15:05 UTCJul 26, 16:55 UTC1h 50m
2026-07-26 SKW6511 PHX → STS Jul 26, 11:15 UTCJul 26, 11:55 UTC40m
2026-07-26 SKW6511 PHX → STS Jul 26, 11:10 UTCJul 26, 12:01 UTC51m
2026-07-26 SKW6339 PHX → SJC Jul 26, 01:45 UTCJul 26, 02:20 UTC35m
2026-07-25 SKW6446 PHX → ELP Jul 25, 20:00 UTCJul 25, 21:15 UTC1h 15m
2026-07-25 SKW6446 PHX → ELP Jul 25, 17:25 UTCJul 25, 18:45 UTC1h 20m
2026-07-25 SKW6335 SBN → DFW Jul 25, 14:05 UTCJul 25, 15:55 UTC1h 50m
2026-07-25 SKW6335 SBN → DFW Jul 25, 13:55 UTCJul 25, 15:49 UTC1h 54m
2026-07-25 SKW6305 DFW → SBN Jul 25, 00:45 UTCJul 25, 02:40 UTC1h 55m
2026-07-25 SKW6305 DFW → SBN Jul 25, 00:49 UTCJul 25, 02:34 UTC1h 45m
2026-07-24 SKW4965 LCH → DFW Jul 24, 20:05 UTCJul 24, 21:35 UTC1h 30m
2026-07-24 SKW4965 LCH → DFW Jul 24, 17:00 UTCJul 24, 18:20 UTC1h 20m
2026-07-24 SKW6403 SAF → DFW Jul 24, 12:10 UTCJul 24, 13:30 UTC1h 20m
2026-07-24 SKW6403 SAF → DFW Jul 24, 12:10 UTCJul 24, 13:23 UTC1h 13m
2026-07-24 SKW6436 DFW → SAF Jul 24, 03:05 UTCJul 24, 04:20 UTC1h 15m
2026-07-24 SKW6385 DRO → DFW Jul 24, 01:15 UTCJul 24, 02:00 UTC45m
2026-07-23 SKW6385 DRO → DFW Jul 23, 22:20 UTCJul 23, 23:30 UTC1h 10m
2026-07-23 SKW4965 LCH → DFW Jul 23, 19:15 UTCJul 23, 20:50 UTC1h 35m
2026-07-23 SKW4965 LCH → DFW Jul 23, 16:25 UTCJul 23, 17:45 UTC1h 20m
2026-07-23 SKW6414 SLC → ORD Jul 23, 12:35 UTCJul 23, 14:30 UTC1h 55m
2026-07-23 SKW6414 SLC → ORD Jul 23, 12:35 UTCJul 23, 14:13 UTC1h 38m
2026-07-23 SKW6442 ORD → ASE Jul 23, 03:05 UTCJul 23, 04:50 UTC1h 45m
2026-07-23 SKW6421 DFW → PVU Jul 23, 00:05 UTCJul 23, 01:00 UTC55m
2026-07-23 SKW6421 DFW → PVU Jul 23, 00:02 UTCJul 23, 00:48 UTC46m
2026-07-22 SKW6421 DFW → PVU Jul 22, 22:20 UTCJul 22, 23:05 UTC45m
2026-07-22 SKW6194 LAX → OKC Jul 22, 17:55 UTCJul 22, 19:55 UTC2h 0m
2026-07-22 SKW6194 LAX → OKC Jul 22, 15:15 UTCJul 22, 17:00 UTC1h 45m
2026-07-22 SKW6302 ABQ → LAX Jul 22, 11:55 UTCJul 22, 13:25 UTC1h 30m
2026-07-22 SKW6302 ABQ → LAX Jul 22, 11:42 UTCJul 22, 13:19 UTC1h 37m
2026-07-22 SKW4981 PHX → CID Jul 22, 02:10 UTCJul 22, 03:30 UTC1h 20m
2026-07-21 SKW6337 SHV → DFW Jul 21, 22:25 UTCJul 21, 23:10 UTC45m
2026-07-21 SKW6337 SHV → DFW Jul 21, 22:24 UTCJul 21, 23:07 UTC43m
2026-07-21 SKW6337 DFW → SHV Jul 21, 20:50 UTCJul 21, 21:25 UTC35m
2026-07-21 SKW6217 - Jul 21, 18:00 UTCJul 21, 18:45 UTC45m
2026-07-21 SKW6217 - Jul 21, 16:05 UTCJul 21, 16:45 UTC40m
2026-07-21 SKW6335 SBN → DFW Jul 21, 12:15 UTCJul 21, 14:10 UTC1h 55m
2026-07-21 SKW6335 SBN → DFW Jul 21, 12:09 UTCJul 21, 14:03 UTC1h 54m
2026-07-21 SKW6305 DFW → SBN Jul 21, 00:45 UTCJul 21, 02:45 UTC2h 0m
2026-07-20 SKW6408 ORD → FNT Jul 20, 12:35 UTCJul 20, 13:55 UTC1h 20m
2026-07-16 SKW9908 - Jul 16, 14:45 UTCJul 16, 14:55 UTC10m
2026-07-16 SKW9908 SAF → COS Jul 16, 13:44 UTCJul 16, 14:30 UTC46m
2026-07-12 SKW6295 - Jul 12, 21:20 UTCJul 12, 22:50 UTC1h 30m
2026-07-12 SKW6194 FSD → DFW Jul 12, 18:05 UTCJul 12, 19:45 UTC1h 40m
2026-07-12 SKW6194 DFW → FSD Jul 12, 15:05 UTCJul 12, 17:10 UTC2h 5m
2026-07-12 SKW6197 LNK → DFW Jul 12, 11:50 UTCJul 12, 13:25 UTC1h 35m
2026-07-12 SKW6197 LNK → DFW Jul 12, 11:47 UTCJul 12, 13:20 UTC1h 33m
2026-07-12 SKW6198 DFW → LNK Jul 12, 04:10 UTCJul 12, 05:35 UTC1h 25m

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 N764SK page for operator, model, and routing details .

Mode-S AA51FE frequently asked

What is Mode-S code AA51FE?
AA51FE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N764SK.
Where is Mode-S AA51FE registered?
Mode-S code AA51FE 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 AA51FE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA51FE, octal 52450776, decimal 11,162,110.
What flights does AA51FE operate?
Mode-S AA51FE has broadcast 20 distinct callsigns, including SKW4994, SKW6194, SKW6229, SKW6399, SKW6337.