Internet Protocol version 4, a 32-bit addressing system using dotted decimal notation.
IPv4 is the fourth version of the Internet Protocol and the most widely deployed protocol for internet communication. It uses a 32-bit address space, providing approximately 4.3 billion unique addresses. Each address is typically written as four decimal numbers separated by dots (e.g., 192.168.1.1), where each number ranges from 0 to 255.