The following link shows how to delegate subdomains. Is that what you are asking about? For example you own xyz.com. You would control host names like
www.xyz.com,
ftp.xyz.com, etc. You'd like to give permission of someone else to control abc.xyz.com, so they could control
www.abc.xyz.com, etc.
http://www.zytrax.com/books/dns/ch9/delegate.htmlIt is used to give someone else control over part of your domain. ISP's use it to allow their clients to get control over their domains as well, or their reverse dns lookups.
