hi,
i see many sites that have their own name.server
for example when i do a whois to this site www.iland.com they say that the name server is:
DNS1.ILAND.COM 65.57.248.5
DNS2.ILAND.COM 63.211.182.4
DNS3.ILAND.COM

i want to know how can i do that for my site
thanks for your help