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This error message occurs when an IP Address is already in use somewhere else in the DNSFilter system, whether that be in another one of your own managed Sites or in another DNSFilter account. 

Follow these steps to locate the duplicate (or confirm the IP Address is not being used somewhere within your own organization).

Standard account

1. From the DNSFilter dashboard, navigate to Deployments and select Sites
2. Use the keyboard search command to find the IP Address
3. Update the IP Address to resolve the error

If the search doesn't return a result, contact our Support team. Include the IP Address and Site name where the error occurs in the request. 

MSP account

1. If using the API, perform a GET request to https://api.dnsfilter.com//v1/ip_addresses to return all the IP Addresses associated with the account
2. Use the keyboard search command to find the IP Address
3. Update the IP Address to resolve the error

If the search doesn't return a result, contact our Support team. Include the IP Address and Site name where the error occurs in the request.