valid_v6?

# File lib/ipaddr.rb, line 710
    def valid_v6?(addr)
      case addr
      when IPAddr::RE_IPV6ADDRLIKE_FULL
        if $2
          $~[2,4].all? {|i| i.to_i < 256 }
        else
          true
        end
      when IPAddr::RE_IPV6ADDRLIKE_COMPRESSED
        if $4
          addr.count(':') <= 6 && $~[4,4].all? {|i| i.to_i < 256}
        else
          addr.count(':') <= 7
        end
      else
        false
      end
    end