Octet

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An IP Address is made up of four octets. 209.153.19.190 is split in four sections separated by a period. Each section is an octet. An octets value ranges from 0 to 255.  The table below gives an example of a Class B Subnet it shows it
shares the first an second octet.

Class B Subnet
IP Address Class Total # Of Bits For Network ID / Host ID 1st Octet 2nd Octet 3rd Octet 4th Octet
Class B 16/16 11111111 (255) 11111111(255) 00000000(0) 00000000(0)

 

See also:
IP Address
CIDR

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