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For questions about network prefixes, where the routing prefix may be expressed in Classless Inter-Domain Routing (CIDR) notation written as the first address of a network, followed by a slash character (/), and ending with the bit-length of the prefix. For instance, you are trying to find the prefix you want to announce on your router.
15
votes
Accepted
IPv6 prefix interpretation
From RFC4291 section 2.3:
An IPv6 address prefix is represented by the notation:
ipv6-address/prefix-length
The whole thing is called prefix.
First part up to / is called address. … Second part after / is called prefix-length. …
5
votes
Accepted
Simple IPv6 Global Unicast question
Left most 001 are fixed, this means the left most nibble can be:
0010 = 0x2
0011 = 0x3
The 4th left most bit is not fixed.