IPV6 GUA range target keeps erroring

I’m trying to setup a new target based on (GUA) IPV6 subnet, but whatever i try i keep getting ‘Error in host specification’.
my (fictive) CIDR is 2001:b939:f2f0:aa44:0000:0000:0000:0000/64, so address range start 2001:b939:f2f0:aa44:0000:0000:0000:0000, end 2001:b939:f2f0:aa44:ffff:ffff:ffff:ffff)

how to enter this ?

The network is simple to big, try to identify the IPv6 hosts and feed a host list. Since IPv6 networks are rather big and rather empty there is no point scanning all IP addresses within a /64 or bigger.

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