Please what is Public IP address of DSN?

a DSN server is a computer that basically has a table that turns 'a href="http://www.yahoo.com'" rel="nofollow"http://www.yahoo.com'/a into the IP address that it needs to get to the website. The internet runs on numberd address between 000.000.000.000 and 255.255.255.255 with a few numbers (those mentioned included) that are reserved. The IP address of your DNS server is basically the webaddress of the computer with the tables to get from a wordded address to a numberd address. You would need to call your ISP to find out what the address of the server is.