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The original DNS protocol provided two label types, which are defined by the first two bits in the length octet of a label (RFC 1035): 00 (standard label) and 11 (compressed label). EDNS introduces the label type 01 as extended label. The lower 6 bits of the first byte may be used to define up to 63 new extended labels.
Single-letter second-level domains are domains in which the second-level domain of the domain name consists of only one letter, such as x.com.In 1993, the Internet Assigned Numbers Authority (IANA) explicitly reserved all single-letter and single-digit second-level domains under the top-level domains com, net, and org, and grandfathered those that had already been assigned.
Seven generic top-level domains were created early in the development of the Internet, and predate the creation of ICANN in 1998. Name: DNS names; Entity: intended use; Administrator: managers; Notes: general remarks; IDN: support for internationalized domain names (IDN) DNSSEC: presence of DS records for Domain Name System Security Extensions
Top-level domains form the DNS root zone of the hierarchical Domain Name System. Every domain name ends with a top-level domain label. During the growth of the Internet, it became desirable to create additional generic top-level domains. As of October 2009, 21 generic top-level domains and 250 two-letter country-code top-level domains existed. [11]
A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wildcard will match are specified in RFC 1034, but the rules are neither intuitive nor clearly ...
A DNS name server is a server that stores the DNS records for a domain; a DNS name server responds with answers to queries against its database. The most common types of records stored in the DNS database are for start of authority ( SOA ), IP addresses ( A and AAAA ), SMTP mail exchangers (MX), name servers (NS), pointers for reverse DNS ...
which would of course preclude using that or any other domain ending with .local. Microsoft TechNet article 708159 [7] suggested .local for the exact opposite reason: Using the .local label for the full DNS name for the internal domain is a more secure configuration because the .local label is not registered for use on the Internet.
The hostname en.wikipedia.org is composed of the DNS labels en (hostname or leaf domain), wikipedia (second-level domain), and org (top-level domain). Labels such as 2600 and 3abc may be used in hostnames, but -hi-, _hi_, and *hi* are invalid. A hostname is considered to be a fully qualified domain name (FQDN) when all labels up to and ...