dig howto

# get the address(es) for yahoo.com
dig yahoo.com A +noall +answer

# get a list of yahoo's mail servers
dig yahoo.com MX +noall +answer

# get a list of DNS servers authoritative for yahoo.com
dig yahoo.com NS +noall +answer

# get all of the above
dig yahoo.com ANY +noall +answer

http://www.madboa.com/geek/dig/