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In this URL:
http://www.subdomain.domainname.abc.xyz.com.us/directory/filename.extension
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Microsoft Internet Explorer has a maximum uniform resource locator (URL) length of 2,083 characters. Internet Explorer also has a maximum path length of 2,048 characters.
The default value is 4294967295 . Optional uint attribute. Specifies the maximum number of segments permitted in a URL. The default value is 32 .
Chrome limits URLs to a maximum length of 2MB for practical reasons and to avoid causing denial-of-service problems in inter-process communication. On most platforms, Chrome's omnibox limits URL display to 32kB ( kMaxURLDisplayChars ) although a 1kB limit is used on VR platforms.
Google Chrome allows the maximum length of the URL to be of the size 2MB (2,097,152 characters). In Firefox the length of the URL can be unlimited but practically after 65,536 characters the location bar no longer displays the URL.
The Wikipedia entry for Subdomain answers both questions:
A subdomain is a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain. For example,
west.example.comandeast.example.comare subdomains of theexample.comdomain, which in turn is a subdomain of the com top-level domain (TLD). A "subdomain" expresses relative dependence, not absolute dependence: for example,wikipedia.orgcomprises a subdomain of theorgdomain, anden.wikipedia.orgcomprises a subdomain of the domainwikipedia.org.
In theory this subdivision can go down to 127 levels deep, and each DNS label can contain up to 63 characters, as long as the whole domain name does not exceed a total length of 255 characters. But in practice most domain registries limit at 253 characters.
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