In the Domain Name System (DNS) hierarchy, a subdomain is a domain that is part of a larger domain. A DNS hierarchy consists of the root-level domain at the top, underneath which are the top-level domains, followed by second-level domains and finally subdomains.

A subdomain is sometimes termed a "vanity domain", especially when it is a subdomain of an ISP's own domain aliased to an individual user account. However, the term "vanity domain" has other usages; the Free On-line Dictionary of Computing defines it as "A domain you register for the sole purpose of having your own domain so you can have an easily remembered URL and e-mail address"while the Jargon File defines it as "An Internet domain, particularly in the .com or .org top-level domains, apparently created for no reason other than boosting the creator's ego."[http://catb.org/~esr/jargon/html/V/vanity-domain.html The Sun iPlanet Messaging Server uses msgVanityDomain to set up a domain name for e-mail use which is not fully hosted. These uses apply primarily to regular second-level domain registrations rather than subdomains (Although, technically speaking, a second-level domain is actually a subdomain of its top-level domain, itself.).

Valid subdomains as described by RFC RFC 1034 may contain any letter or number as well as the '-' (hyphen), but must begin with an alphabet character. While both upper and lower case characters are valid, subdomains are case insensitive so 'ABC.com' is identical to 'abc.COM'.

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Finally, set up tumblr on my subdomain. http://ping.fm/gTf8k That will be my primary place to blog. Check http://is.gd/5lUyO
mgthantzin (Thant Zin Oo) Sun, 13 Dec 2009 16:53:41 -0000
Finally, set up tumblr on my subdomain. http://ping.fm/gTf8k That will be my primary place to blog. Check http://is.gd/5lUyO
Cheap Web Hosting - Is A Domain Name That Much Better Than A Subdomain?: I have not yet gotten a... http://bit.ly/7vpkiw <<<< Read More....
cheap_Hosting_ (Cheap Web Hosting) Sun, 13 Dec 2009 16:07:28 -0000
Cheap Web Hosting - Is A Domain Name That Much Better Than A Subdomain?: I have not yet gotten a... http://bit.ly/7vpkiw <<<< Read More....
@maatien http://www.basicthinking.de/blog/2009/12/12/co-de-99-euro-fuer-eine-billige-subdomain-gefaellig/
knuspermagier (knuspermagier) Sun, 13 Dec 2009 16:04:42 -0000
@maatien http://www.basicthinking.de/blog/2009/12/12/co-de-99-euro-fuer-eine-billige-subdomain-gefaellig/
@slith76 Brief habe ich auch bekommen: http://bit.ly/80DoEK Lachen musste ich auch ;) #co.de #subdomain
websenat (Ramón) Sun, 13 Dec 2009 15:47:30 -0000
@slith76 Brief habe ich auch bekommen: http://bit.ly/80DoEK Lachen musste ich auch ;) #co.de #subdomain
@Hexxeh Thanks for letting us know. I posted your distro on Total Linux, and a few people have asked where the chromeos subdomain went.
richs_lxh (rich scadding) Sun, 13 Dec 2009 15:17:57 -0000
@Hexxeh Thanks for letting us know. I posted your distro on Total Linux, and a few people have asked where the chromeos subdomain went.
Web Design-HTML - Website Design: subdomain.mysite.com VS. mysite.com/subdomain (HTML) http://forum.techgle.com/showthread.php?t=20082
techgle_web_dgn (Techgle Html Web) Sun, 13 Dec 2009 13:57:02 -0000
Web Design-HTML - Website Design: subdomain.mysite.com VS. mysite.com/subdomain (HTML) http://forum.techgle.com/showthread.php?t=20082

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