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Chapter 11. Name Resolution and the Doma... > The DNS Name Space
11.2. The DNS Name Space
The set of all names used with DNS constitutes the DNS name space. This space is partitioned hierarchically and is case insensitive, similar to computer file system folders (directories) and files. The current DNS name space is a tree of domains with an unnamed root at the top. The top echelons of the tree are the so-called top-level domains (TLDs), which include generic TLDs (gTLDs), country-code TLDs (ccTLDs), and internationalized country-code TLDs (IDN ccTLDs), plus a special infrastructure TLD called, for historical reasons, ARPA [RFC3172]. These form the top levels of a naming tree with the form shown in Figure 11-1.
Figure 11-1. The DNS name space forms a hierarchy with an unnamed root at the top. The top-level domains (TLDs) include generic TLDs (gTLDs), country-code TLDs (ccTLDs), internationalized TLDs (IDN ccTLDs), and a special infrastructure TLD called ARPA.
