Funtoo ip token set support. Dynamic prefix, static host. Using Delegated prefix with a static host.

interface-tokenized

#!/bin/sh
#/etc/netif.d/interface-tokenized

netif_pre_up() {
	local count=-1
	local label
	local bcast
	for ipnm in $ipaddr $ipaddrs; do
		if [ $count -ge 0 ]
		then
			label=$interface:$count
		else
			label=""
		fi
		if [ -n "$(if_ipv4 $ipnm)" ]
		then
			bcast="broadcast $(get_option "$ipnm" broadcast +)"
		else
			bcast=""
		fi
		if [ -z "$label" ]
		then
			ip addr add $(get_ipnm_part "$ipnm") $bcast \
				dev $interface || die "Couldn't add $ipnm to $interface"
		else
			ip addr add $(get_ipnm_part "$ipnm") $bcast \
				label $label dev $interface || die "Couldn't add $ipnm to $interface"
		fi
		count=$(( $count + 1 ))	
	done
	if [ -n "$ip6token" ]
	then
        try ip token set "$ip6token" dev "$interface"
	fi
}

netif_post_down() {
        try ip token del dev "$interface"
}

netif.enp0s1

#/etc/conf.d/netif.enp0s1
template="interface-tokenized"

# Use ::53 for the host portion of the address.
# If the Prefix given is    2001:db8:feed:1::/64
# Then your address will be 2001:db8:feed:1::53/64
# Note iproute2 only supports 1 token per interface ATM.
ip6token="::53/64"

# For more information about ipv6 tokens, read the man page
# for 'ip-token' or the refrenced draft-chown-6man-tokenised-ipv6-identifiers-02