![]() ![]() If 0, the address is locally administered and if 1, the address is globally unique. This bit identifies whether this interface identifier is universally or locally administered. Next, the seventh bit from the left, or the universal/local (U/L) bit, needs to be inverted. Here is an example showing how a the MAC Address is used to generate EUI. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address. The MAC address is first separated into two 24-bits, with one being OUI (Organizationally Unique Identifier) and the other being NIC specific. The IPv6 EUI-64 format address is obtained through the 48-bit MAC address. This feature is a key benefit over IPv4 as it eliminates the need of manual configuration or DHCP as in the world of IPv4. You can only convert those valid IPv4-represented IPv6 addresses.Extended Unique Identifier (EUI), as per RFC2373, allows a host to assign iteslf a unique 64-Bit IP Version 6 interface identifier (EUI-64). A particular range of IPv6 addresses represents the IPv4 addresses space. Therefore, you cannot convert all the IPv6 addresses to IPv4 addresses. ![]() Thus, IPv6 addresses are 1028 times larger than IPv4 addresses in numbers. The IPv4 address is 32-bit long, and the IPv6 address is 128-bit long. Is there a one-one correspondence between IPv4 and IPv6 addresses? However, you can compress IPv6 as per your need. However, the actual number is slightly less, as several ranges are for a particular use or excluded to use.Īn example of an expanded IPv6 is: fe80:cd00:0000:0cde:1257:0000:211e:729c IPv6 address is the latest and most up to dated IP version. Therefore, to overcome future scarcity, IPv6 was introduced. 2: IPv6 addressĪlthough the IPv4 address carries most Internet traffic, however, due to the unconstructed distribution of IPv4 addresses, the world realized the upcoming shortage of IPv4 addresses. It uses a 32-bit address scheme and contains more than 4 billion IP addresses (4,294,967,296 in exact amount). IPv4 is the most commonly recognized IP address version and carries most internet traffic. An IP address, or Internet address, is categorized into two main versions: IPv4 and IPv6. What are IPv4 and IPv6?īefore diving deeper into IPv4 and IPv6 addresses, one must have an idea of what is an IP address.Īn IP address or Internet Protocol address is a unique number string assigned to each device connected to the computer network. To break down a single network into smaller networks, use an IP subnet calculator for subnetting.
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