And there are other uses as well that I will leave up to your administrative imagination. This can be used to block certain URLs by redirecting them to a dead end, for example. This is sometimes used by administrators to make one-off configuration changes, or behavior modifications, for a computer they want to behave differently from other computers on the their network. But it can be modified to include custom name to IP address mappings that will circumvent other DNS lookup operations on the system. It contains the information, by default, that's configured in your network system preferences. We need to add a line to the end of this file for each virtual host we want to configure.
For example, if you want to redirect to on your local machine, use hosts file. Consider hosts file as an address book which is under the control of admin and can be used to map host names to IP addresses. The etc/nf file, which we see here, is used by DiG and is automatically generated. You should see something like this: when the system is booting. What is a Hosts File Hosts file is a plain-text file residing on your Mac system.
Which isn't really a problem on local client systems unless a user with administrative privileges has modified the contents of a couple of important files on the client computer. The resolver used by DiG does not use the same processes used by the rest of OS X in El Capitan.
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