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sensors Mode-S transponder

ACCAF4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N923SW · BOMBARDIER Regional Jet CRJ-200 · operated by SKYWEST AIRLINES INC

Hex
ACCAF4
Octal
53145364
Decimal
11,324,148
Country
US
Tail
N923SW
Type
CRJ2
No current signal · last broadcast Jul 26, 16:15 UTC
Flights observed
640
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 16:15 UTC

Last known position

Most recent position reported by Mode-S ACCAF4.

Country allocation

The ICAO 24-bit address ACCAF4 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
SKW5085 SkyWest Airlines 8 2026-07-25
SKW5031 SkyWest Airlines 7 2026-06-12
SKW5017 - 7 2026-06-17
SKW5036 - 6 2026-07-03
SKW6065 SkyWest Airlines 5 2026-07-24
SKW592J SkyWest Airlines 5 2026-06-11
SKW5100 SkyWest Airlines 5 2026-05-22
SKW5062 SkyWest Airlines 5 2026-07-26
SKW5053 SkyWest Airlines 5 2026-07-25
SKW4808 - 5 2026-06-25
SKW6073 - 4 2026-06-24
SKW6071 - 4 2026-06-24
SKW6068 SkyWest Airlines 4 2026-07-25
SKW6059 - 4 2026-07-01
SKW5801 SkyWest Airlines 4 2026-05-06
SKW5696 SkyWest Airlines 4 2026-05-18
SKW5585 SkyWest Airlines 4 2026-06-11
SKW5555 - 4 2026-06-20
SKW5361 SkyWest Airlines 4 2026-06-08
SKW5139 - 4 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5104 DEN → SUX Jul 26, 15:05 UTCJul 26, 16:10 UTC1h 5m
2026-07-26 SKW5062 FOD → ORD Jul 26, 03:30 UTCJul 26, 04:12 UTC42m
2026-07-26 SKW5062 FOD → ORD Jul 26, 03:15 UTCJul 26, 04:15 UTC1h 0m
2026-07-25 SKW6068 ORD → MCW Jul 25, 23:10 UTCJul 26, 00:45 UTC1h 35m
2026-07-25 SKW6068 ORD → MCW Jul 25, 23:17 UTCJul 26, 00:40 UTC1h 23m
2026-07-25 SKW321C DEN → DVL Jul 25, 20:35 UTCJul 25, 21:55 UTC1h 20m
2026-07-25 SKW5053 DVL → DEN Jul 25, 16:45 UTCJul 25, 18:00 UTC1h 15m
2026-07-25 SKW5053 DVL → DEN Jul 25, 16:55 UTCJul 25, 17:58 UTC1h 3m
2026-07-25 SKW486V DEN → IDA Jul 25, 14:40 UTCJul 25, 15:55 UTC1h 15m
2026-07-25 SKW5085 EAR → DEN Jul 25, 11:45 UTCJul 25, 12:10 UTC25m
2026-07-25 SKW5085 EAR → DEN Jul 25, 11:45 UTCJul 25, 12:02 UTC17m
2026-07-25 SKW359C DEN → LAR Jul 25, 03:20 UTCJul 25, 03:40 UTC20m
2026-07-25 SKW4650 DEN → SJC Jul 25, 01:30 UTCJul 25, 01:35 UTC5m
2026-07-24 SKW4650 DEN → SJC Jul 24, 23:43 UTCJul 25, 01:12 UTC1h 29m
2026-07-24 SKW4650 DEN → SJC Jul 24, 21:45 UTCJul 25, 01:35 UTC3h 50m
2026-07-24 SKW445W ORD → FNT Jul 24, 16:20 UTCJul 24, 16:55 UTC35m
2026-07-24 SKW445W ORD → FNT Jul 24, 16:15 UTCJul 24, 16:49 UTC34m
2026-07-24 SKW440U SFO → SBP Jul 24, 14:50 UTCJul 24, 15:15 UTC25m
2026-07-24 SKW6065 TUS → IAH Jul 24, 01:15 UTCJul 24, 01:40 UTC25m
2026-07-23 SKW6065 TUS → IAH Jul 23, 20:05 UTCJul 23, 20:45 UTC40m
2026-07-23 SKW6078 ORD → PAH Jul 23, 14:10 UTCJul 23, 17:50 UTC3h 40m
2026-07-23 SKW4800 CMH → ORD Jul 23, 12:00 UTCJul 23, 12:40 UTC40m
2026-07-23 SKW5240 SFO → SBP Jul 23, 06:25 UTCJul 23, 07:05 UTC40m
2026-07-23 SKW5240 SFO → SBP Jul 23, 06:21 UTCJul 23, 07:07 UTC46m
2026-07-22 SKW5098 DIK → DEN Jul 22, 21:20 UTCJul 23, 04:40 UTC7h 20m
2026-07-22 SKW5126 SGU → DEN Jul 22, 16:30 UTCJul 22, 17:05 UTC35m
2026-07-22 SKW566Z DEN → JLN Jul 22, 14:20 UTCJul 22, 15:00 UTC40m
2026-07-22 SKW5104 DEN → SUX Jul 22, 11:30 UTCJul 22, 12:25 UTC55m
2026-07-21 SKW302C DEN → PIR Jul 21, 22:40 UTCJul 21, 23:35 UTC55m
2026-07-21 SKW5116 - Jul 21, 20:45 UTCJul 21, 21:10 UTC25m
2026-07-21 SKW5116 RKS → DEN Jul 21, 20:31 UTCJul 21, 21:25 UTC54m
2026-07-21 SKW380F - Jul 21, 18:40 UTCJul 21, 19:00 UTC20m
2026-07-21 SKW5513 SFO → MFR Jul 21, 11:25 UTCJul 21, 12:10 UTC45m
2026-07-21 SKW5802 MSN → ORD Jul 21, 01:30 UTCJul 21, 02:15 UTC45m
2026-07-21 SKW5802 MSN → ORD Jul 21, 01:35 UTCJul 21, 02:27 UTC52m
2026-07-20 SKW5084 PIR → DEN Jul 20, 22:25 UTCJul 20, 23:30 UTC1h 5m
2026-07-20 SKW302C DEN → PIR Jul 20, 20:40 UTCJul 20, 21:40 UTC1h 0m
2026-07-20 SKW5028 SUX → ORD Jul 20, 16:50 UTCJul 20, 17:35 UTC45m
2026-07-20 SKW5028 SUX → ORD Jul 20, 15:55 UTCJul 20, 16:05 UTC10m
2026-07-20 SKW645V DEN → YQR Jul 20, 01:29 UTCJul 20, 03:05 UTC1h 36m
2026-07-20 SKW645V DEN → YQR Jul 20, 01:25 UTCJul 20, 02:05 UTC40m
2026-07-19 SKW5084 PIR → DEN Jul 19, 22:15 UTCJul 19, 23:20 UTC1h 5m
2026-07-19 SKW302C DEN → PIR Jul 19, 20:10 UTCJul 19, 21:10 UTC1h 0m
2026-07-19 SKW302C DEN → PIR Jul 19, 20:13 UTCJul 19, 21:10 UTC57m
2026-07-19 SKW5522 - Jul 19, 16:35 UTCJul 19, 17:20 UTC45m
2026-07-19 SKW5518 DEN → GCC Jul 19, 14:20 UTCJul 19, 14:46 UTC26m
2026-07-19 SKW5518 - Jul 19, 14:05 UTCJul 19, 14:40 UTC35m
2026-07-19 SKW5513 SFO → MFR Jul 19, 11:15 UTCJul 19, 11:55 UTC40m
2026-07-19 SKW5226 DEN → CPR Jul 19, 03:05 UTCJul 19, 03:45 UTC40m
2026-07-19 SKW5078 LBL → DEN Jul 19, 00:30 UTCJul 19, 00:55 UTC25m

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 N923SW page for operator, model, and routing details .

Mode-S ACCAF4 frequently asked

What is Mode-S code ACCAF4?
ACCAF4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N923SW.
Where is Mode-S ACCAF4 registered?
Mode-S code ACCAF4 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 ACCAF4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACCAF4, octal 53145364, decimal 11,324,148.
What flights does ACCAF4 operate?
Mode-S ACCAF4 has broadcast 20 distinct callsigns, including SKW5085, SKW5031, SKW5017, SKW5036, SKW6065.