How to find out who your DNS provider is.
The first step for updating your DNS begins with your domain name provider. If you don’t remember who that is, don’t worry! We’ve got some tips for finding your DNS provider.
First, check your billing records. Your domain host is usually who you bought your domain from. Searching your email archives for billing records related to registering or transferring your domain may help you find it easily.
If your billing records search yielded no results, use a domain search tool like InterNIC.
To use this tool, navigate to https://lookup.icann.org/
Type your domain name in the search box.
Select the Domain option, and then click Submit.
Scroll down to “Registrar Information,” and the registrar's name should be shown.
You can use the first Name Server Entry if the registrar is not listed.
Copy the name server (NS) information that appears after the colon (:), and then paste it into the search box at the top of the page. Select Nameserver, and then click Submit.
On the search results page, locate the Registrar entry. This entry lists your DNS hosting provider, the DNS provider who owns the name server for your domain.