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In page IPv6:

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All interfaces of IPv6 hosts require a link-local address, which have the prefix fe80::/10. This prefix is followed by 54 bits that can be used for subnetting, although they are typically set to zeros, and a 64-bit interface identifier. The host can compute and assign the Interface identifier by itself without the presence or cooperation of an external network component like a DHCP server, in a process called link-local address autoconfiguration.[citation needed]