Hi there, In the 'man' pages for 'ipset' on my systems, and at https://ipset.netfilter.org/ipset.man.html one sees [quote] netmask cidr When the optional netmask parameter specified, network addresses will be stored in the set instead of IP host addresses. The cidr prefix value must be between 1-32. [...] [/quote] I've just used a value of 64 for an IPv6 set. It seems to work. :) Have I missed something, or is the documentation in need of an update? -- 73, Ged.