This pie chart shows the distribution of the IPv6 blocks that have already been allocated among the different RIRs (expressed in number of /32s).
The field ‘Total Lengh’which is part of the IPv4 header, is not found in the IPv6 header. Its function was to count the size of the packet payload plus the size of a variable lenght header. As the IPv6 header has a fixed size, the presence of this field is unnecessary.