I used to have a blog under the domain "thehashtable.com", so I have a domain account under that name on my hosting service. When that domain name expired on GoDaddy, I created a domain alias on the hosting service called "thepraxis.co.za", still under my "thehashtable.com" account. This worked, i.e. typing "thepraxis.co.za" into a browser address bar would cause the browser to load my WordPress blog's home page.
Last week I was fiddling around with DNS records for "thepraxis.co.za" and "thehashtable.com", and I don't recall what I did, but now typing "thepraxis.co.za" into the browser gives a "Google Chrome could not find thepraxis.co.za" error. I can ping the URL though, and the blog installation is still active on the host.
How can I use elementary tools like nslookup to determine why my blog is missing and qwhat DNS records I need to restore to get it 'live' again?