Hosts File Editor utility

Windows includes a local "Hosts" file that contains domain names and matching IP addresses, acting as a map to identify and locate hosts on IP networks. Every time you visit a website, your computer will check the hosts file first to see which IP address it connects to. If the information is not there, your internet service provider will look into the Domain Name Server (DNS) for the resources to load the site. The Hosts File Editor provides a convenient way to edit the hosts file. This can be useful for scenarios like migrating a website to a new hosting provider or domain name, which may take a 24-48 hour period of downtime. Creating a custom IP address to associate with your domain using the hosts file can enable you to see how it will look on the new server.

Adding a new entry

Ensure that the Hosts File Editor is set to On in the PowerToys Settings.

To add a new entry using the Hosts File Editor:

• Select New entry
• Enter the IP address
• Enter the Host name
• Enter any comments that may be helpful in identifying the purpose of the entry
• Turn on the Active toggle and select Add

Filtering host file entries

To filter host file entries, select the filter icon and enter data in either the Address, Hosts, or Comment field to narrow the scope of results.

Back up Hosts file

Hosts File Editor creates a backup of the hosts file before editing session. The backup files are located near the hosts file in %SystemRoot%\System32\drivers\etc named hosts_PowerToysBackup_YYYYMMDDHHMMSS.

Settings

From the Settings menu, the following options can be configured:

Setting	Description
Open as administrator	Open as administrator to be able edit the hosts file. If disabled, the editor is run in read-only mode. Hosts File Editor is started as administrator by default.
Show a warning at startup	Warns that editing hosts can change DNS names resolution. Enabled by default.
Additional lines position	Default value is Top. If Bottom is selected, the file header is moved below hosts settings to the bottom.
Consider loopback addresses as duplicates	Loopback addresses (like 127.0.0.1 and ::1) are considered as duplicates.

Troubleshooting

A "Failed to save hosts file" message appears if a change is made without administrator permissions:

Select Open as administrator in settings to fix the error.