General troubleshooting commands. All these are windows terminal commands, Linux and MacOS will have similar:
General reachability of the domain:
ping eevblog.com
If your DNS server can resolve eevblog.com
nslookup eevblog.com
This gives me two IP adresses: 192.154.109.3 and 192.154.111.219, but these might be different depending on you location if eevblog uses a CDN
If it doesn't, you have a DNS issue. Temporarily you can set the DNS servers on the affected computer (or on your router) to 8.8.8.8 (google DNS) or 9.9.9.9, and you should connect ATT that at least one of their DNS servers is borked.