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DNS Labels, Names and Syntax Rules
(Page 3 of 3)
DNS Name Length Limit
There is a maximum limit of 255 characters
for a complete domain name, for implementation purposes. In practice,
most domain names are much shorter than this limit, as it would violate
the whole purpose of domain names if we let them get so long that nobody
could remember them anyway.
In many protocols, it is possible
to specify a particular resource within a domain name by providing a
directory structure after a name. This is done using the standard TCP/IP
uniform resource locator (URL) syntax, where a path is indicated using
slashes to separate subdirectories. For example, a specific file at
salt.crystal.rocks might be located at salt.crystal.rocks/chem/composition.
While DNS names are case-insensitive,
the labels in a URL path are not. So this example would
be different from salt.crystal.rocks/chem/Composition. See the
topic on URL syntax for more details.
Key Concept: A domain name is a string of text that uniquely identifies a particular node in the name space. The domain name for a node is constructed by concatenating in right-to-left order all the labels in the branch of the DNS tree starting from the top of the tree down to the particular node, separating each by a dot (period.)
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
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