1. Browse to http://www.digwebinterface.com/
2. Enter the list of hosts you wish to test under Hostnames or IP addresses:
3. Select Resolver under Name Servers:
4. Check Trace under Options
5. Click Dig
First section of results are root servers.
Next section are authoritative name servers for the TLD
Next section (your domain) are the NS records from the domain registry.
Next section (your domain) are the NS records provided an authoritative NS