The IP Mapper v4tov6 is a Application which allows you to organize your extisting v4 Network to an v6 Network. You can enter your IPv6 Base address with prefix or Site ID and VLAN ID based on your provider given IPv6 address space.
Then you can enter your existing IPv4 address which will then generate to a unique IPv6 address. You can choose the IPv4 subnet mask prefix with zero prefix for a /64 base address or any subnet mask which will then generate a IPv6 Subnet. The generated IPv6 addresse is based on the IPv4 address but the 32 bit value of the IPv4 address will be copied into a 64 bit value with a zero bit beetween every IPv4 address bit. This is made to match the given IPv6 subnet for the IPv4 address.
