Apparatus

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sensors Mode-S transponder

A1ECFF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N223JS · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
A1ECFF
Octal
50366377
Decimal
10,611,967
Country
US
Tail
N223JS
Type
CRJ2
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
538
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A1ECFF.

Country allocation

The ICAO 24-bit address A1ECFF 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
SKW5064 SkyWest Airlines 8 2026-07-21
SKW5027 SkyWest Airlines 7 2026-07-23
SKW6058 SkyWest Airlines 6 2026-07-26
SKW5087 - 6 2026-06-23
SKW5057 SkyWest Airlines 6 2026-06-13
SKW5029 - 6 2026-07-05
SKW4752 SkyWest Airlines 6 2026-07-22
SKW4631 SkyWest Airlines 6 2026-06-09
SKW6069 SkyWest Airlines 5 2026-07-23
SKW5952 - 5 2026-06-17
SKW5224 - 5 2026-06-17
SKW5085 - 5 2026-06-16
SKW5024 SkyWest Airlines 5 2026-05-29
SKW5023 - 5 2026-06-23
SKW4736 SkyWest Airlines 5 2026-06-08
SKW6073 - 4 2026-06-28
SKW6067 SkyWest Airlines 4 2026-05-17
SKW6060 SkyWest Airlines 4 2026-07-20
SKW6056 - 4 2026-06-22
SKW5783 - 4 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5563 BIH → SFO Jul 26, 20:15 UTCJul 26, 21:10 UTC55m
2026-07-26 SKW6058 DEN → LBF Jul 26, 15:35 UTCJul 26, 16:20 UTC45m
2026-07-25 SKW777Y ORD → SUX Jul 25, 21:50 UTCJul 25, 22:25 UTC35m
2026-07-25 SKW4747 ORD → XNA Jul 25, 18:30 UTCJul 25, 19:15 UTC45m
2026-07-25 SKW789X ORD → DAY Jul 25, 17:02 UTCJul 25, 17:24 UTC22m
2026-07-25 SKW789X ORD → DAY Jul 25, 16:45 UTCJul 25, 17:30 UTC45m
2026-07-25 SKW5213 ORD → LEX Jul 25, 14:05 UTCJul 25, 15:00 UTC55m
2026-07-24 SKW476T ORD → CAK Jul 24, 23:45 UTCJul 25, 00:45 UTC1h 0m
2026-07-24 SKW4718 FAT → SFO Jul 24, 20:40 UTCJul 24, 22:00 UTC1h 20m
2026-07-24 SKW5244 ORD → TUL Jul 24, 17:55 UTCJul 24, 19:10 UTC1h 15m
2026-07-24 SKW6058 DEN → LBF Jul 24, 15:40 UTCJul 24, 16:25 UTC45m
2026-07-24 SKW6058 DEN → LBF Jul 24, 15:09 UTCJul 24, 16:15 UTC1h 6m
2026-07-23 SKW364V ORD → PLN Jul 23, 21:50 UTCJul 23, 22:30 UTC40m
2026-07-23 SKW6059 DEN → LBL Jul 23, 19:05 UTCJul 23, 20:15 UTC1h 10m
2026-07-23 SKW6069 VCT → IAH Jul 23, 17:25 UTCJul 23, 18:05 UTC40m
2026-07-23 SKW6069 VCT → IAH Jul 23, 17:03 UTCJul 23, 18:13 UTC1h 10m
2026-07-23 SKW5027 DEC → ORD Jul 23, 14:45 UTCJul 23, 15:15 UTC30m
2026-07-23 SKW5027 DEC → ORD Jul 23, 14:49 UTCJul 23, 15:09 UTC20m
2026-07-23 SKW598C ORD → SUX Jul 23, 12:55 UTCJul 23, 13:25 UTC30m
2026-07-23 SKW4714 FNT → ORD Jul 23, 10:35 UTCJul 23, 11:20 UTC45m
2026-07-22 SKW5258 RDM → SFO Jul 22, 23:45 UTCJul 23, 00:25 UTC40m
2026-07-22 SKW4752 ORD → ROA Jul 22, 18:50 UTCJul 22, 20:05 UTC1h 15m
2026-07-22 SKW519Y ORD → CAK Jul 22, 17:05 UTCJul 22, 18:05 UTC1h 0m
2026-07-21 SKW5064 DEC → ORD Jul 21, 23:55 UTCJul 22, 00:35 UTC40m
2026-07-21 SKW5064 DEC → ORD Jul 21, 22:40 UTCJul 21, 23:05 UTC25m
2026-07-21 SKW5249 SAN → LAX Jul 21, 18:15 UTCJul 21, 18:50 UTC35m
2026-07-21 SKW5249 SAN → LAX Jul 21, 18:27 UTCJul 21, 18:33 UTC6m
2026-07-21 SKW5535 ORD → MLI Jul 21, 17:00 UTCJul 21, 17:14 UTC14m
2026-07-21 SKW6055 IAH → VCT Jul 21, 13:25 UTCJul 21, 15:25 UTC2h 0m
2026-07-20 SKW6060 EAR → DEN Jul 20, 23:20 UTCJul 21, 00:50 UTC1h 29m
2026-07-20 SKW5783 - Jul 20, 20:50 UTCJul 20, 21:20 UTC30m
2026-07-20 SKW5783 FWA → ORD Jul 20, 20:46 UTCJul 20, 21:27 UTC41m
2026-07-20 SKW4645 - Jul 20, 16:00 UTCJul 20, 16:25 UTC25m
2026-07-20 SKW4670 - Jul 20, 12:15 UTCJul 20, 13:25 UTC1h 10m
2026-07-20 SKW4670 DLH → ORD Jul 20, 12:21 UTCJul 20, 13:23 UTC1h 2m
2026-07-20 SKW359M ORD → DLH Jul 20, 03:10 UTCJul 20, 04:05 UTC55m
2026-07-20 SKW4681 - Jul 20, 00:10 UTCJul 20, 00:55 UTC45m
2026-07-19 SKW5907 ORD → MLI Jul 19, 21:50 UTCJul 19, 22:25 UTC35m
2026-07-19 SKW6059 DEN → LBL Jul 19, 18:55 UTCJul 19, 20:05 UTC1h 10m
2026-07-19 SKW6069 - Jul 19, 17:00 UTCJul 19, 17:35 UTC35m
2026-07-19 SKW5027 DEC → ORD Jul 19, 14:49 UTCJul 19, 14:56 UTC7m
2026-07-19 SKW598C - Jul 19, 12:55 UTCJul 19, 13:30 UTC35m
2026-07-19 SKW4714 FNT → ORD Jul 19, 10:55 UTCJul 19, 11:55 UTC1h 0m
2026-07-18 SKW494R ORD → FOD Jul 18, 20:40 UTCJul 18, 21:20 UTC40m
2026-07-18 SKW4794 - Jul 18, 13:35 UTCJul 18, 13:55 UTC20m
2026-07-18 SKW4794 SBN → ORD Jul 18, 13:33 UTCJul 18, 13:55 UTC22m
2026-07-07 SKW5143 - Jul 7, 17:40 UTCJul 7, 17:55 UTC15m
2026-07-06 SKW4645 - Jul 6, 17:50 UTCJul 6, 18:15 UTC25m
2026-07-06 SKW5910 LNK → ORD Jul 6, 15:35 UTCJul 6, 16:21 UTC46m
2026-07-06 SKW5910 - Jul 6, 15:05 UTCJul 6, 15:15 UTC10m

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 N223JS page for operator, model, and routing details .

Mode-S A1ECFF frequently asked

What is Mode-S code A1ECFF?
A1ECFF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N223JS.
Where is Mode-S A1ECFF registered?
Mode-S code A1ECFF 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 A1ECFF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1ECFF, octal 50366377, decimal 10,611,967.
What flights does A1ECFF operate?
Mode-S A1ECFF has broadcast 20 distinct callsigns, including SKW5064, SKW5027, SKW6058, SKW5087, SKW5057.