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Internet Governance Glossary


2.21 IPv4 / Internet Protocol version 4

Connectionless internetworking protocol version 4 in the Internet’s Internet Layer supporting 32-bit IP addresses which allows for approximately 4 billion unique IP addresses.


IPv4 as used on packet-switched networks operating on a best effort delivery model is still dominantly in use today, the number 4 is the protocol version number carried in every IP datagram.