/etc/host

# For Windows :
# Open your text editor in Administrator mode.
# In the text editor, open C:\Windows\System32\drivers\etc\hosts.
# Add the IP Address and hostname.
#Example:

171.10.10.5 opm.server.com

# Save the changes.
 
# For Linux :
# Open terminal.
# Use the nano command line text editor or a different one you have available to open the hosts file. The command with nano is as follows (the command will require your Linux user password)   

sudo nano /etc/hosts

# Add the appropriate changes in the hosts file.
# Example:

171.10.10.5 opm.server.com

# Use the Control and 'X' key combination to save the changes.

The hosts file (also referred to as etc\hosts) is a text file used by operating systems including windows to map IP addresses to host names/domain names. This file acts as a local DNS service for your local machine and it overrides the mappings from the DNS server to which your machine is connected over the network.

https://www.manageengine.com/network-monitoring/how-to/how-to-add-static-entry.html

Before the advent of DNS, the host table was the only way of resolving hostnames on the fledgling Internet.

https://manpages.ubuntu.com/manpages/trusty/man5/hosts.5.html

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