I’ve started compiling a list of name server domain names and the companies associated with them. This list has been helpful in guiding clients to the correct company to contact when modifying DNS records.
You can determine your clients’ name servers by using a command line utility like whois or dig (e.g.
whois salferrarello.com or
dig NS salferrarello.com). Alternatively, you can use a website like http://whois.domaintools.com/ to find the name servers.
Corporation Service Company
DNS Made Easy