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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.
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 (>).
Lookups of IP address allocations are often limited to the larger Classless Inter-Domain Routing (CIDR) blocks (e.g., /24, /22, /16), because usually only the regional Internet registries (RIRs) and domain registrars run RWhois or WHOIS servers, although RWhois is intended to be run by even smaller local Internet registries, to provide more ...
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.
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.
.chn is a new top-level domain with its own root DNS server for an Internet of Things (IoT) network in China. The company developing this alternative root claims that China has its own intellectual right on this new alternative domain name root and the associated IoT network, and that it will become the second computer network in the world.
Besides Wikipedia internal search engine, there are various search engines that can provide domain-specific searches, which let you search Wikipedia specifically. Searches are based on the text as shown by the browser, so wiki markup is irrelevant.