IPv4 (Internet Protocol version 4)
IPv4 is the fourth version of the Internet Protocol, used to identify devices or hosts on a network.
32-bit address
Has 4 octets
1 octet = 8 bits
X.X.X.X = 4 × 8 = 32 Bits
Dotted decimal format
Limit of 4.3 billion unique addresses
IPv4 Address Classes
Class A
Class B
Class C
Class D
Class E
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