IPv4 is a connectionless protocol, and operates on a best-effort delivery model, in that it does not guarantee delivery, nor does it assure proper sequencing or avoidance of duplicate delivery.OverviewInternet Protocol version 4 (IPv4) is the first version of the (IP) as a standalone specification. It is one of the core protocols of standards-based methods in the and other. The Internet Protocol ("IP") is the protocol that defines and enables at the of the. It gives the Internet a global-scale logical addressing system which allows the. Earlier versions of TCP/IP were a combined specification through TCP/IPv3. With IPv4, the Internet Protocol became a separate specification. Internet Protocol version 4 is described in publication.