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Domain Names

DNS

Domain Name Servers translate domain names into IP addresses.

Internet addresses (IP numbers) are extremely difficult to remember. In the "good old days" you needed to look up IP numbers in tables to discover a particular server's IP number. Domain names help resolve this issue by using aliases for IP addresses. For example, the domain name gla.ac.uk currently is an alias for the IP address 130.209.0.0

ICANN is responsible for issuing the top level domain names. These include generic categories and country names.

Examples of top level domains
Categories Countries
.edu Educational .no Norway
.com Commercial organisations .uk UK
.gov Government .jp Japan


Most top level country domains issue a range of sub-domains based on categories simlar to the top level category domains. Individuals or organisations can register domain names within these sub domains.

Examples of sub domains within the .uk domain
.ac Academic institutions
.co Companies
.org

Non profit organisations



Next: DNS Tables