Best Current Practices in for IPv6 Address Allocation This Best Practices document aims to provide IPv6 Address allocation guidelines that a network operator can follow while planning the IPv6 sub-netting for its network (based on the issues faced and learning’s from IPv6 implementation in NKN and NIC network). Best Current Practice: 1. Sub-netting IPv6 addresses generally written in Hex format. Each Hex number represents 4 bit, commonly known as nibble. A nibble boundary is a network mask that aligns on a 4-bit boundary. Sub-netting the v6 address at nibble boundary improves efficiency and make it easier to understand for humans* (Machine will anyway read it binary format J ). Example of Nibble and non-Nibble Boundaries Sub-netting From the above example, we can clearly see that Sub-netting at the Nibble boundaries is easier to manage and do the sub-netting. * Condition may arise where you may have to