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'''IPv4 (Internet Protocol version 4)''' refers to the version of Internet protocol that supports 32-bit IP addresses. This allows for approximately 4 billion unique IP addresses  which is not enough to cope with projected Internet demand in the next 5-10 years. A new protocol called IPv6 has been developed that increases the number of possible IP addresses substantially.

'''IPv4 (Internet Protocol version 4)''' refers to the version of Internet protocol that supports 32-bit IP addresses. This allows for approximately 4 billion unique IP addresses  which is not enough to cope with projected Internet demand in the next 5-10 years. A new protocol called IPv6 has been developed that increases the number of possible IP addresses substantially.<ref>[http://www.iana.org/about/glossary/ www.iana.org]</ref>