Let’s do some other examples and it will become more clear. To calculate an IP address select the IP version, introduce an IP address, choose a bitmask/prefix length and click 'calculate'. You can easily add the IPv6 compression widget on your website by copying the following HTML code and place it on your web page Shortening an expanded IPv6 address to its compressed form is an easy process which can be done with simple online tools. Ipv6 compression online Current price $14.