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In computer networks, a reverse DNS lookup or reverse DNS resolution (rDNS) is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name. [1]
According to RFC 1034, "a domain is a subdomain of another domain if it is contained within that domain". Based on that definition, a host cannot be a subdomain, only a domain can be a subdomain. A subdomain will also have a separate zone file with a SOA record (Start of Authority). Most domain registries only allocate a two-level domain name ...
Wildcard domains are widely used by blogging websites that allow users to create sub-domains upon demand; e.g., sites such as WordPress or Blogspot. Another popular use is by Free Dynamic DNS websites that allow users to create a DNS name that changes to match their host IP as the IP address is changed periodically by their ISP's DHCP server.
A private sub-domain registry allocates domain names in a subset of the Domain Name System under a domain registered with an ICANN-accredited or ccTLD registry. Most of the private sub-domain registries operate based on an ISO 3166-1 name that is a subdomain of a higher-level domain.
Individual ccTLDs may have varying requirements and fees for registering subdomains. There may be a local-presence requirement (for instance, citizenship or other connection to the ccTLD), as, for example, the American ( us ), Japanese ( jp ), Canadian ( ca ), French ( fr ) and German ( de ) domains, or registration may be open.
DNS zones are not necessarily physically separated from one another; however, a DNS zone can contain multiple subdomains, and multiple zones can exist on the same server. The domain namespace of the Internet is organized into a hierarchical layout of subdomains below the DNS root domain. The individual domains of this tree may serve as ...
That includes resources available via the domain and all its sub-domains. Two domains are related if they are in the same site, i.e. they share a suffix that is not included in the Public Suffix List. Security issues like a same-site attack can arise if the Public Suffix List is incorrect, or if browsers or sites are not properly configured. [9 ...
A country code second-level domain is a second-level domain to a country code top-level domain. [citation needed] Such a domain may be reserved by a domain name registry for the registration of third-level domains, or assigned to a third party as a subdomain.