Each octet is bits. Since , each octet holds values from to . The address has four octets: , , , and . When you see , the first octet is , second is , third is , and fourth is . You'll need to think in octets constantly when subnetting, so get comfortable with this structure now.
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
$ curl repovive.com/roadmaps/network-design/ip-addressing-and-subnetting/understanding-octets
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░█████████████████████████████████████████████████████████████████████████████████████████████