The Internet Engineering Task Force (IETF) 
Home page of the Internet Engineering Task Force (IETF), the protocol engineering and development arm of the Internet. Their page offers information about the organization, as well as links to working groups, topics, mailing lists, meetings, and proceedings.
OSSP UUID
UUIDs are intended as unique identifiers for both mass tagging objects with an extremely short lifetime and to reliably identifying very persistent objects across a network.
RFC 4122 A UUID URN Namespace
This specification defines a Uniform Resource Name namespace for UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier). A UUID is 128 bits long, and requires no central registration process.
