You can check by going to http://www.internic.com/whois.html
In the box type your name server name such as ns1.yourdomain.com then click "Nameserver (ex. NS.EXAMPLE.COM or 87.248.114.32) " option.
After submitting it will come back with your name server name, the ip that name server is registered to, and the registar you bought your domain from.
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