Octet

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)

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