Summarizing IPv6 networks into a single IPv6 prefix and prefix-length can be done in seven steps as shown in Figures 1 to 7:
Step 1. List the network addresses (prefixes) and identify the part where the addresses differ.
Step 2. Expand the IPv6 if it is abbreviated.
Step 3. Convert the differing section from hex to binary.
Step 4. Count the number of far left matching bits to determine the prefix-length for the summary route.
Step 5. Copy the matching bits and then add zero bits to determine the summarized network address (prefix).
Step 6. Convert the binary section back to hex.
Step 7. Append the prefix of the summary route (result of Step 4).