32-bit IP addressing is the IP address scheme used in Internet Protocol 4 (IPv6 uses a 128-bit system). In IPv4, an IP address is a 32-bit number that identifies each sender or receiver of information that is sent in packets across the Internet.The 32-bit IP address (we have a separate definition of it with IP address) is often depicted as a dot address (also called dotted quad notation) - that is, four groups (or quads) of decimal numbers separated by periods.