One of my website hosts moved their servers, and in doing so, messed up the ns1/ns2 name servers for a number of domains.
When I tried to access the domain in New Zealand, the browser reported that the name server could not be found. But when I accessed the domain via a USA Proxy, I could see the domain.
While the whois reported the correct ns1/ns2, my isp xnet as well as xtras dns servers reported the old name server details.
I was able to see the reported nameservers via the following service.
Name servers: ns1.xnet.co.nz alien.xtra.co.nz
The systems reported the old name servers.