Use of this DNS Lookup and Name Server Lookup tool is free.

Search DNS information on a domain, including IP Addresses, Name Servers, the Start of Authority, A and MX records, and other popular DNS choices which are searched and displayed if they exist, such as POP, POP3, IMAP, FTP, FTPS, www, webmail, mail and SMTP. Simply enter a domain name in the box below, and click "Check Domain" to look up all of the DNS information on that domain.