Comcast Completes DNSSEC Upgrade

According to this Comcast blog post, the MSO has fully implemented Domain Name System Security Extensions (DNSSEC). It's now automatically included as part of Comcast Constant Guard from Xfinity.

Currently, 17.8 million Xfinity Internet subs are using DNSSEC-validating DNS servers, and all of the MSO's 5,000 domain names have been cryptographically signed. Also, all Comcast servers now support IPv6.
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