Looks like this: the affected subdomains are CNAMEd to the akamai CDN, and the Nameserver for those are/were down. So for example: Top level domain for nvidia

Looks like this: the affected subdomains are CNAMEd to the akamai CDN, and the Nameserver for those are/were down. So for example: Top level domain for nvidia resolved fine.. dig @1.1.1.1 nvidia.com => status: NOERROR, Nameservers are ns6.dnsmadeeasy.com But the website didnt. dig @1.1.1.1 www.nvidia.com => status: SERVFAIL, The Nameserver for the this www.nvidia resolved to the akamai nameserver which had a problem.. dig @1.1.1.1 www.nvidia.com NS => CNAME e33907.a.akamaiedge.net.