Objects of type ipv6-address represent an IPv6 address.
ipv6-address objects are normally created by get-host-entry. They can also be created by parse-ipv6-address.
ipv6-address can be used wherever an IP address is needed, most commonly open-tcp-stream.
ipv6-address may contain a scope ID, which is not really part of the address, but is needed for using local addresses.
The string representation of an ipv6-address can be retrieved by ip-address-string. The scope ID can be accessed by ipv6-address-scope-id.
LispWorks User Guide and Reference Manual - 20 Sep 2017