I always thought the intellitxt ads were part of this site?
Is that related to your DNS question?
What makes you ask?
DNS is the "Domain Name System" on the internet. It is like a phone book if you like, i.e. you type in pcadvisor.co.uk and your PC then asks its DNS Server (defined in your network connection or your router or somewhere) for the IP address which corresponds to that DNS.
So you don't really 'have' a DNS. Your ISP has a DNS server. You can have a domain NAME e.g. phil2816.co.uk but that's not a DNS.
Can you give some more background as to why you think you might need "a DNS" ?