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Internet Engineering Task Force
The IETF is a publication of proposed specifications. Since this group relies on volunteers results can be slow and changes to fundamental protocols like SMTP must be backwards compatible so that they don't break for the millions of people and thousands of companies that rely on them.
Internet Corporation for Assigned Names and Numbers
Much of its work has concerned the Internet's global Domain Name System (DNS), including policy development for internationalization of the DNS system, introduction of new generic top-level domains (TLDs), and the operation of root name servers.
Internet Architecture Board
Provides architectural oversight of Internet protocols and procedures