IPv4 What is IPv4? IPv4, or Internet Protocol version 4, is the fourth version of the Internet Protocol. It assigns unique numerical addresses to devices for identification and communication over networks. Explanation IPv4 uses 32-bit addresses, allowing for approximately 4.3 billion unique IP addresses. It is widely used but increasingly supplemented by IPv6 due to address exhaustion. Practical Example of IPv4 A home router assigns an IPv4 address to each connected device, enabling them to communicate over the internet.