namespace

The full set of names that one naming system can hold, with its own rules on who may create a name. The DNS (glossary)DNS Domain Name System The internet's directory that links domain names to computer addresses. Full definition of DNS is one namespace, with a single root coordinated through ICANN (glossary)ICANN Internet Corporation for Assigned Names and Numbers The nonprofit that coordinates the global DNS and gTLD policy. Full definition of ICANN and IANA (glossary)IANA Internet Assigned Numbers Authority The functions that coordinate the root zone, IP addresses and protocol numbers. Full definition of IANA. Other systems that use names of similar shape are separate namespaces, so the same name can exist in two of them.