IPv4 (Internet Protocol version 4)

IPv4 defines an IP address as a 32-bit number.

IP addresses are written and displayed in a human-readable format as 192.0.2.1.

Due to a reduction in the supply of IPv4 addresses, a new version of IPv6 that uses a 128-bit number was developed and has been used in addition to IPv4 since the mid-2000s.

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