On your computer there is a file called "hosts". It maps domain names to ip addresses. You can use this yourself to create temporary mappings of domain names to ip addresses like 127.0.0.1.
On this page of the site you can watch the video online How to use your HOSTS file with a duration of hours minute second in good quality, which was uploaded by the user Steve Griffith - Prof3ssorSt3v3 15 July 2018, share the link with friends and acquaintances, this video has already been watched 2,304 times on youtube and it was liked by 48 viewers. Enjoy your viewing!