At least on June 2-3, 2012, you may see a small number of edits from IPv6 addresses, which are in the form ""2001:0db8:85a3:0000:0000:8a2e:0370:7334"". See e.g. w:en:IPv6 address. These addresses should behave like any other IP address: You can leave messages on their talk pages; you can track their contributions; you can block them. (See the full version of this announcement for notes on range blocks.)