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Subdomain
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Heimbemadnera



Dołączył: 30 Lip 2013
Posty: 1

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Subdomain
For a protein domain inside of a larger domain, see Protein domains.
In the Domain Name System (DNS) hierarchy, asubdomainis a domain that is part of a larger domain.
Overview
The Domain Name System (DNS) has a tree structure or hierarchy, with each node on the tree being a domain name. Asubdomainis a domain that is part of a larger domain; the only domain that is not also a subdomain is the root domain. For example, mail.example.com and calendar.example.com are subdomains of the example.com domain, which in turn is a subdomain of the com top-level domain (TLD). A "subdomain" expresses relative dependence, not absolute dependence: for example, wikipedia.org comprises a subdomain of the org domain, and en.wikipedia.org comprises a subdomain of the domain wikipedia.org. In http://www.sameowner.com/preview_submit.html?subject=http://www.herkules.wroclaw.pl 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.[potrzebne źródło]
Uses
In the United Kingdom, the third level domain names are standard and branch off of the second-level domains, for example:

.ac.uk - academic (tertiary education, further education colleges and research establishments) and learned societies
.co.uk - general use (usually commercial)
.gov.uk - government (central and local)
.judiciary.uk - courts (to be introduced in the near future)[4]
.ltd.uk - limited companies
.me.uk - general use (usually personal)
.mod.uk - Ministry of Defence and HM Forces public sites
.net.uk - ISPs and network companies (unlike .net, use is restricted to these users)
.nhs.uk - National Health Service institutions
.nic.uk - network use only (Nominet UK)
.org.uk - general use (usually for non-profit organisations)
.parliament.uk - parliamentary use (only for the UK Parliament and the Scottish Parliament)
.plc.uk - public limited companies
.police.uk - police forces[5]
.sch.uk - Local Education Authorities, schools, primary and secondary education, community education

Subdomains are also used by organizations that wish to assign a unique name to a particular department, function, or service related to the organization. For example, a university might assign "cs" to the computer science department, such that a number of hosts could be used inside that subdomain, such as mail.cs.example.edu or www.cs.example.edu.
Vanity domain
A vanity domain is a subdomain of an ISP's domain that is aliased to an individual user account, or a subdomain that expresses the individuality of the person on whose behalf it is registered.
Server cluster
Depending on application, a record inside a domain, or subdomain might refer to a hostname, or a service provided by a number of machines in a cluster. Some websites use different subdomains to point to different server clusters. For example, www.example.com points to Server Cluster 1 or Datacentre 1, and www2.example.com points to Server Cluster 2 or Datacentre 2, etc.
Subdomains v. directories
example.com/yn points to a directory within the example.com domain, not to a subdomain of example.com.
See also
- Domain name
- Domain Name System
- Hostname
- Subdirectory
- Vanity domain

_________________
http://www.sameowner.com/preview_submit.html?subject=http://www.herkules.wroclaw.pl
Wto Lip 30, 2013 10:55 Ogląda profil użytkownika Wyślij prywatną wiadomość Wyślij email Odwiedź stronę autora Adres AIM Yahoo Messenger MSN Messenger Nazwa Skype
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Wto Lip 30, 2013 10:55
valenz
Weteran


Dołączył: 11 Maj 2018
Posty: 33297

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Pon Maj 21, 2018 23:57 Ogląda profil użytkownika Wyślij prywatną wiadomość
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Pon Maj 21, 2018 23:57
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