Apparatus

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sensors Mode-S transponder

A99B5F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N718SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A99B5F
Octal
52315537
Decimal
11,115,359
Country
US
Tail
N718SK
Type
CRJ7
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
717
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A99B5F.

Country allocation

The ICAO 24-bit address A99B5F 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
SKW6488 SkyWest Airlines 16 2026-07-24
SKW6407 SkyWest Airlines 13 2026-07-23
SKW4987 SkyWest Airlines 11 2026-07-25
SKW6202 - 10 2026-06-15
SKW4972 - 10 2026-07-17
SKW6438 - 9 2026-07-19
SKW6251 SkyWest Airlines 9 2026-07-22
SKW6200 - 9 2026-07-20
SKW4955 SkyWest Airlines 9 2026-06-06
SKW6459 SkyWest Airlines 8 2026-05-02
SKW6245 - 8 2026-06-17
SKW4999 SkyWest Airlines 8 2026-05-16
SKW6391 - 7 2026-06-15
SKW6204 - 7 2026-07-13
SKW6513 - 6 2026-07-08
SKW6493 SkyWest Airlines 6 2026-07-21
SKW6487 SkyWest Airlines 6 2026-07-21
SKW6464 - 6 2026-07-18
SKW6451 SkyWest Airlines 6 2026-06-08
SKW6450 - 6 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4950 PHX → SFO Jul 26, 20:55 UTCJul 26, 21:45 UTC50m
2026-07-26 SKW4950 PHX → SFO Jul 26, 19:00 UTCJul 26, 19:50 UTC50m
2026-07-26 SKW6338 PHX → TUL Jul 26, 16:45 UTCJul 26, 17:50 UTC1h 5m
2026-07-26 SKW245G IAH → ORD Jul 26, 14:30 UTCJul 26, 15:20 UTC50m
2026-07-26 SKW6465 DTW → ORD Jul 26, 12:10 UTCJul 26, 12:55 UTC45m
2026-07-26 SKW4931 LAX → PHX Jul 26, 00:30 UTCJul 26, 01:15 UTC45m
2026-07-25 SKW4987 ORD → CVG Jul 25, 22:10 UTCJul 25, 22:50 UTC40m
2026-07-25 SKW4987 ORD → CVG Jul 25, 22:08 UTCJul 25, 22:48 UTC40m
2026-07-25 SKW4987 ORD → CVG Jul 25, 20:15 UTCJul 25, 20:55 UTC40m
2026-07-25 SKW6207 SFO → LAX Jul 25, 18:05 UTCJul 25, 18:40 UTC35m
2026-07-25 SKW6207 SFO → LAX Jul 25, 17:57 UTCJul 25, 18:24 UTC27m
2026-07-25 SKW245G IAH → ORD Jul 25, 16:40 UTCJul 25, 17:05 UTC25m
2026-07-25 SKW6363 DFW → BRO Jul 25, 13:55 UTCJul 25, 14:45 UTC50m
2026-07-25 SKW6363 DFW → BRO Jul 25, 12:15 UTCJul 25, 13:05 UTC50m
2026-07-25 SKW4976 ORD → DTW Jul 25, 09:40 UTCJul 25, 10:40 UTC1h 0m
2026-07-25 SKW6498 ORD → LEX Jul 25, 03:20 UTCJul 25, 04:10 UTC50m
2026-07-25 SKW6291 SJC → LAX Jul 25, 00:35 UTCJul 25, 01:25 UTC50m
2026-07-24 SKW6291 SJC → LAX Jul 24, 23:00 UTCJul 24, 23:45 UTC45m
2026-07-24 SKW6418 DFW → BRO Jul 24, 20:15 UTCJul 24, 20:55 UTC40m
2026-07-24 SKW6418 DFW → BRO Jul 24, 20:13 UTCJul 24, 20:42 UTC29m
2026-07-24 SKW6418 DFW → BRO Jul 24, 18:40 UTCJul 24, 19:05 UTC25m
2026-07-24 SKW6488 ORD → YYZ Jul 24, 16:07 UTCJul 24, 16:49 UTC42m
2026-07-24 SKW6488 ORD → YYZ Jul 24, 15:55 UTCJul 24, 17:05 UTC1h 10m
2026-07-24 SKW6488 ORD → YYZ Jul 24, 13:50 UTCJul 24, 15:00 UTC1h 10m
2026-07-24 SKW6488 ORD → YYZ Jul 24, 13:37 UTCJul 24, 14:52 UTC1h 15m
2026-07-24 SKW4826 SMX → PHX Jul 24, 10:25 UTCJul 24, 11:10 UTC45m
2026-07-24 SKW4826 SMX → PHX Jul 24, 10:34 UTCJul 24, 11:16 UTC42m
2026-07-24 SKW4824 PHX → SMX Jul 24, 04:25 UTCJul 24, 05:10 UTC45m
2026-07-24 SKW4824 PHX → SMX Jul 24, 04:24 UTCJul 24, 05:02 UTC38m
2026-07-24 SKW6399 MKE → ORD Jul 24, 00:50 UTCJul 24, 01:55 UTC1h 5m
2026-07-24 SKW6399 MKE → ORD Jul 24, 00:47 UTCJul 24, 01:52 UTC1h 5m
2026-07-23 SKW6399 MKE → ORD Jul 23, 22:55 UTCJul 23, 23:50 UTC55m
2026-07-23 SKW6407 BFL → PHX Jul 23, 19:37 UTCJul 23, 20:45 UTC1h 8m
2026-07-23 SKW6407 BFL → PHX Jul 23, 19:40 UTCJul 23, 20:50 UTC1h 10m
2026-07-23 SKW6407 BFL → PHX Jul 23, 17:05 UTCJul 23, 17:45 UTC40m
2026-07-23 SKW6407 BFL → PHX Jul 23, 17:15 UTCJul 23, 18:06 UTC51m
2026-07-23 SKW4952 SEA → PHX Jul 23, 12:15 UTCJul 23, 13:20 UTC1h 5m
2026-07-23 SKW4942 DAY → ORD Jul 23, 04:30 UTCJul 23, 05:40 UTC1h 10m
2026-07-23 SKW6218 DTW → ORD Jul 23, 00:10 UTCJul 23, 02:15 UTC2h 5m
2026-07-22 SKW6218 DTW → ORD Jul 22, 21:20 UTCJul 22, 23:05 UTC1h 45m
2026-07-22 SKW5014 HRL → DFW Jul 22, 17:20 UTCJul 22, 18:55 UTC1h 35m
2026-07-22 SKW5014 HRL → DFW Jul 22, 17:13 UTCJul 22, 18:47 UTC1h 34m
2026-07-22 SKW5014 HRL → DFW Jul 22, 15:05 UTCJul 22, 16:05 UTC1h 0m
2026-07-22 SKW6251 PHX → SLC Jul 22, 11:10 UTCJul 22, 12:50 UTC1h 40m
2026-07-22 SKW4943 PIA → ORD Jul 22, 02:25 UTCJul 22, 04:00 UTC1h 35m
2026-07-21 SKW6230 - Jul 21, 23:30 UTCJul 22, 00:25 UTC55m
2026-07-21 SKW6230 CVG → ORD Jul 21, 23:29 UTCJul 22, 00:22 UTC53m
2026-07-21 SKW6230 - Jul 21, 22:05 UTCJul 21, 22:45 UTC40m
2026-07-21 SKW6249 PHX → GJT Jul 21, 19:25 UTCJul 21, 20:30 UTC1h 5m
2026-07-21 SKW6249 PHX → GJT Jul 21, 16:55 UTCJul 21, 18:00 UTC1h 5m

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 N718SK page for operator, model, and routing details .

Mode-S A99B5F frequently asked

What is Mode-S code A99B5F?
A99B5F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N718SK.
Where is Mode-S A99B5F registered?
Mode-S code A99B5F 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 A99B5F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A99B5F, octal 52315537, decimal 11,115,359.
What flights does A99B5F operate?
Mode-S A99B5F has broadcast 20 distinct callsigns, including SKW6488, SKW6407, SKW4987, SKW6202, SKW4972.