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DOMAIN
Overview
The most common types of domain names are hostnames that
provide more memorable names to stand in for numeric IP
addresses. They allow for any service to move to a
different location in the topology of the Internet (or
an intranet), which would then have a different IP
address.
By allowing the use of unique alphabetical addresses
instead of numeric ones, domain names allow Internet
users to more easily find and communicate with web sites
and other server-based services. The flexibility of the
domain name system allows multiple IP addresses to be
assigned to a single domain name, or multiple domain
names to be assigned to a single IP address. This means
that one server may have multiple roles (such as hosting
multiple independent Web sites), or that one role can be
spread among many servers. One IP address can also be
assigned to several servers, as used in anycast and
hijacked IP space.
Hostnames are restricted to the ASCII letters "a"
through "z" (case-insensitive), the digits "0" through
"9", and the hyphen, with some other restrictions.
Registrars restrict the domains to valid hostnames,
since, otherwise, they would be useless. The
Internationalized domain name (IDN) system has been
developed to bypass the restrictions on character
allowances in hostnames, making it easier for users of
non-english alphabets to use the Internet. The
underscore character is frequently used to ensure that a
domain name is not recognized as a hostname, for example
with the use of SRV records, although some older
systems, such as NetBIOS did allow it. Due to confusion
and other reasons, domain names with underscores in them
are sometimes used where hostnames are required.
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