Top Level Domain Length

Country code top level domains.

Top level domain length. Some top level domain names are longer than we re used to but they can still be shorter overall. The length of any one label is limited to between 1 and 63 octets. The precise syntax allowed in top level domain name labels has been the subject to some debate. Rfc 1123 for example makes the statement that top level domain names are alphabetic.

The top level domain article provides the background information. Dns name of the generic top level domain entity. Top level domain length vs. The official list of all top level domains is maintained by the internet assigned numbers authority iana.

A domain name that only includes ascii letters digits and hyphens is termed an ldh label. A full domain name is limited to 255 octets including the separators. A list of all valid top level domains is maintained by the iana and is updated from time to time. Table legend name dns name of the two letter country code top level domain.

By andrew allemann february 17 2014 uncategorized 29 comments. A further 3. As of june 2020 this number is 316 with the addition of internationalized domains. A top level domain tld is one of the domains at the highest level in the hierarchical domain name system of the internet.

To view the list. The following is a list of internet top level domains. Although the definitions of a labels and ldh labels. Target audience or restricted use notes.

The top level domain names are installed in the root zone of the name space. That one restriction relates to the length of the label and the full name. A lot of people have questioned if some new top level domain names are simply too long. As of 20 may 2017 there were 255 country code top level domains purely in the latin alphabet using two character codes.

The dns itself places only one restriction on the particular labels that can be used to identify resource records. This document updates the definition of allowable top level domain names in order to support internationalized domain names idns as encoded by the idna protocols. This statistic gives information on the distribution of worldwide top level domains as of october 2020.