'''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>
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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.<ref>[http://www.iana.org/about/glossary/ www.iana.org]</ref>