Editing IPv6 (section)

===Global addressing===
[[File:IPv6 global unicast address stracture-en.svg|thumb|The global unicast address structure in IPv6]]
The assignment procedure for global addresses is similar to local-address construction. The prefix is supplied from router advertisements on the network. Multiple prefix announcements cause multiple addresses to be configured.<ref name="T. Narten pp. 54"/>

Stateless address autoconfiguration (SLAAC) requires a {{IPaddr||64}} address block.{{Ref RFC|4291}} [[Local Internet registry|Local Internet registries]] are assigned at least {{IPaddr||32}} blocks, which they divide among subordinate networks.<ref>{{Cite web |date=8 February 2011 |title=IPv6 Address Allocation and Assignment Policy |url=https://www.ripe.net/publications/docs/ripe-512/ |url-status=live |archive-url=https://web.archive.org/web/20230603052402/https://www.ripe.net/publications/docs/ripe-512 |archive-date=3 June 2023 |access-date=27 March 2011 |publisher=[[RIPE NCC]] }}</ref> The initial recommendation of {{date|September 2001}} stated assignment of a {{IPaddr||48}} subnet to end-consumer sites.{{Ref RFC|3177}} In {{Date|March 2011}} this recommendation was refined:{{Ref RFC|6177}} The [[IETF]] "recommends giving home sites significantly more than a single {{IPaddr||64}}, but does not recommend that every home site be given a {{IPaddr||48}} either". Blocks of {{IPaddr||56}}s are specifically considered. It remains to be seen whether ISPs will honor this recommendation. For example, during initial trials, [[Comcast]] customers were given a single {{IPaddr||64}} network.<ref>{{Cite press release |last=Brzozowski |first=John |date=31 January 2011 |title=Comcast Activates First Users With IPv6 Native Dual Stack Over DOCSIS |url=https://corporate.comcast.com/comcast-voices/comcast-activates-first-users-with-ipv6-native-dual-stack-over-docsis |url-status=live |archive-url=https://web.archive.org/web/20231023064638/https://corporate.comcast.com/comcast-voices/comcast-activates-first-users-with-ipv6-native-dual-stack-over-docsis |archive-date=23 October 2023 |access-date=15 April 2019 |publisher=[[Comcast]] }}</ref>