You are not required to change the nameservers on your domain to use our services, but we highly recommend it. If you don't wish to change your nameservers, you can obtain the IP addresses for your servers and enter them manually into the DNS records for your domain.
We cannot guarantee the
reliability of our service and our uptime guarantee would not apply if
you decide to host your own DNS. It is possible that your account may
need to be relocated due to a server problem and the IP address may
need to be changed quickly; in this case, your service would be offline
since we won't be able to change the address.