I recently moved my website to a VPS solution and in doing so was instructed to set up two custom nameservers with my domain registrar: ns1.mydomainname.com and ns2.mydomainname.com
I followed the instructions but I am not sure how to tell if they are actually active. I tried checking on http://www.whatsmydns.net/ and it resolves to the current IP for my active site.
My point is to make sure the nameservers are 'live' before I make the switch. What is the recommended way to confirm a custom nameserver is valid?