Hello.
Thank you for your request.
Yes, it is possible.
1. Please, go to your Personal Lists page here:
https://cleantalk.org/my/show_private
2. Press the blue button “Add new records” for the Anti-Spam Service.
3. Add a subnet you want or IPs you want.
Example for a subnet: 10.11.12.13/24
4. Select websites you want to apply this record to.
5. Press the green button “Whitelist”.
Please note that changes will be applied in 10 minutes for your CleanTalk Control Panel.
Now the CleanTalk plugin has to see the changes. It will take them automatically in an hour, or simply press “Save Changes” on its settings page to make the plugin see your whitelist changes immediately:
WordPress Admin Page —> Settings —> Antispam by CleanTalk —> Save Changes.
Contact us anytime.
Best regards.