IPv6 Optimal Address Plan and Allocation Tool

As described in section 23.3.31 of the Migrating to IPv6 book and in RFC 3531, this web tool implements RFC 3531 and helps network managers to make an IPv6 address plan for any network, such as provider and enterprise networks, specially when there are multiple levels of delegations.

Last prefix allocated:
Number of bits (range):
Bit Allocation Algorithm:	leftmost centermost rightmost
Number of prefixes to generate:
Output format	HTML Tabletxt

Usage Example

You are a provider and own the prefix 2001:db8::/32. You want to generate a list of /40 prefixes for your downstream providers.

Enter the start prefix (i.e. 2001:db8::/32).
Specify the number of bits you want to allocate. If you allocate 25 downstream providers, choose 6 bits (for a maximum of 32).
Choose the bit allocation algorithm.

leftmost when you have the leftmost prefix and you are the first(highest) level of delegation.
centermost when you are not the first(highest) nor the last(lowest) level of delegation
rightmost where you are the last level of delegation (usually when you are generating /64).

Choose the number of prefixes to generate on the output.
Select the output format: txt means no HTML formatting: one prefix per line.