Domain Registrar with Sub-domain Service and Whois Guard That can Handle Huge Traffic?

Hi guys,

Any recommendations for a domain registrar with abovementioned requirements? Currently, I'm using internet.bs.

I'm just using their sub-domain service and the default nameservers. They're pretty good so far but have been down quite a number of times.

Basically, I'm looking for a domain provider, where u can easily create sub-domains, and their default nameservers (or default servers) can handle a huge amount of traffic (about 10K per day).

Any recommendations?