For added security, account owners and admins can block users authenticated with specific domains from joining meetings and webinars hosted by their account. If authentication profiles are also enabled, a user joining the meeting or webinar must satisfy the authentication profile in addition to not being on the domain block list.

Notes:

• The domain block list must be used in conjunction with authentication profiles. If authentication is not required for your webinars or meetings, including PMIs, the blocked list will not be able to verify the domain someone has authenticated with. 
• This setting overrides allowed domains in authentication profile settings. You can add domains that you previously allowed in the authentication profile settings, but users with the blocked domain will be unable to join meetings and webinars.
• Specific participant(s) matching the blocked domain can bypass the restriction if the host adds them as an authentication exception for the meeting or webinar.

Prerequisites for blocking users in specific domains

• Pro, Business, Education, or Enterprise account
• Zoom desktop client
  • Windows: 5.7.0 or higher
  • macOS: 5.7.0 or higher
  • Linux: 5.7.0 or higher
• Zoom mobile app
  • Android: 5.7.0 or higher
  • iOS: 5.7.0 or higher

How to enable a domain block list

Account

To enable Block users in specific domains from joining meetings and webinars for all users in the account:

1. Sign in to the Zoom web portal as an admin with the privilege to edit account settings.
2. In the navigation panel, click Account Management then Account Settings.
3. Click the Meeting tab.
4. Under Security, verify that Block users in specific domains from joining meetings and webinars is enabled.
5. If the setting is disabled, click the toggle to enable it. If a verification dialog appears, click Enable to verify the change.
6. Enter the domains that you want to block from joining meetings and webinars.
7. Click Save.
8. (Optional) If you want to make this setting mandatory for all users in your account, click the lock icon , and then click Lock to confirm the setting.

Group

To enable Block users in specific domains from joining meetings and webinars for a group of users:

1. Sign in to the Zoom web portal as an admin with the privilege to edit groups.
2. In the navigation panel, click User Management then Groups.
3. Click the applicable group name from the list, then click the Meeting tab.
4. Under Security, verify that Block users in specific domains from joining meetings and webinars is enabled.
5. If the setting is disabled, click the toggle to enable it. If a verification dialog appears, click Enable to verify the change.
   Note: If the option is grayed out, it has been locked at the account level and needs to be changed at that level.
6. Enter the domains that you want to block from joining meetings and webinars. You can add multiple domains using a comma in between, and/or use a wild card for listing domains.
7. Click Save.
8. (Optional) If you want to make this setting mandatory for all users in the group, click the lock icon , and then click Lock to confirm the setting.

User

To enable Block users in specific domains from joining meetings and webinars for your own use:

1. Sign in to the Zoom web portal.
2. In the navigation panel, click Settings.
3. Click the Meeting tab.
4. Under Security, verify that Block users in specific domains from joining meetings and webinars is enabled.
5. If the setting is disabled, click the toggle to enable it. If a verification dialog appears, click Enable to verify the change.
   Note: If the option is grayed out, it has been locked at either the group or account level. You need to contact your Zoom admin.
6. Enter the domains that you want to block from joining meetings and webinars that you host.
7. Click Save.