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These resources include domain names, IP address blocks and autonomous systems, but it is also used for a wider range of other information. The protocol stores and delivers database content in a human-readable format. [1] The current iteration of the WHOIS protocol was drafted by the Internet Society, and is documented in RFC 3912.
To set Wikipedia as the default search engine: Click the hamburger menu and go to the 'Options' menu. In the options menu, click on 'Search'. To set Wikipedia as the default search engine, click on the dropdown menu under "Default Search Engine" and select Wikipedia. To trigger the keyword search: Type the '@' key into the search bar.
The default search domain is the article space, but any namespace may be specified in a query. At the search results page, any number of namespaces can be specified, and users can keep those namespaces as their own default search domain. Partial namespace searches can be made by specifying the initial letters of a page name.
A reverse DNS lookup is a query of the DNS for domain names when the IP address is known. Multiple domain names may be associated with an IP address. The DNS stores IP addresses in the form of domain names as specially formatted names in pointer (PTR) records within the infrastructure top-level domain arpa. For IPv4, the domain is in-addr.arpa.
For example: "Search topic" site:*.ro lists websites under the .ro generic top-level domain. Omitting results by adding a minus (-) sign and url addresses for unwanted sites can result in higher-relevance hits (or at least higher relevance hits per Wikipedia's notability standards, to omit sites that aren't valid for demonstrating topic ...
The concept of a search domain plays an important part in all this. By default it is just article space, but in general a search domain starts out as a set of namespaces, and ends up as all the pages in the search result. One term of a query will set the search domain for another term in the same query. The order is optimized by the search engine.
The reverse DNS database of the Internet is rooted in the .arpa top-level domain. Although the informational RFC 1912 (Section 2.1) recommends that "every Internet-reachable host should have a name" and that "for every IP address, there should be a matching PTR record," it is not an Internet Standard requirement, and not all IP addresses have a ...
nslookup operates in interactive or non-interactive mode. When used interactively by invoking it without arguments or when the first argument is - (minus sign) and the second argument is a hostname or Internet address of a name server, the user issues parameter configurations or requests when presented with the nslookup prompt (>).