Resolv.conf

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The correct title of this article is resolv.conf. The initial letter is shown capitalized due to technical restrictions.

In Unix and related computer operating systems, the configuration file resolv.conf contains information that allows a computer connected to the Internet to resolve names into addresses.

Before a computer can connect to an external network resource (say, for example, a web server), it must have a means of converting any alpha-numeric names used into numeric network addresses. (The Internet uses structured numeric IP addresses as network addresses.)

The file typically contains the IP addresses of nameservers (DNS name resolvers) that will attempt to translate names into addresses for any node available on the network.

Historical reasons explain the spelling of "resolve" without the trailing "e" in "resolv.conf".