![]() ![]() In hexadecimal notation, these addresses always begin with FE80. In link-local addresses, the first 10 bits are always set to 1111 1110 10, and the next 54 bits are set to 0. Routers never forward packets sent on the loopback address. In IPv4, the loopback address is 127.0.0.1. It allows the host device to send packets to itself. It is commonly used for testing and debugging purposes. A loopback interface is a virtual interface. Loopback addressĪ loopback address is assigned to a loopback interface. Interfaces usually use the unspecified address to learn their own unique addresses. Routers never forward an IPv6 packet with a source address of unspecified. The unspecified address is never assigned to an interface or used as a destination address. An interface uses the unspecified address as a source address only if a valid address is not assigned to the interface. The unspecified address indicates the absence of an address. The unspecified address in IPv4 is 0.0.0.0 while the unspecified address in IPv6 is 0.0.0.0.0.0.0.0. ![]() In other words, if an interface that is not configured with a valid IP address wants to send a data packet, it can use the unspecified address in the source address field of the packet. Unspecified addressĪn unspecified address represents an interface that does not have an address. ![]() These types are unspecified, loopback, link-local, site-local or unique local, and global. There are five main types of unicast addresses in IPv6. Packets sent to a unicast address are delivered to a single interface. A unicast address identifies a single interface in the network.
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