Support XFINITY Internet About Domain Name System Security
Extensions (DNSSEC)   What you need to know about DNSSEC.
DNSSEC is enhanced security  DNSSEC (Domain Name System Security
Extensions) is part of Constant Guard, which helps provide you
with the best and safest online experience possible. It allows
websites and ISPs to validate domain names to ensure they
haven’t been tampered with.  With DNSSEC, a website name such as
is signed into the Domain Name System (DNS). Then, when you try
to connect to that website, the Comcast DNS servers verify its
security signature. You will only be connected if the website
passes the verification process, which happens so quickly you
shouldn’t even notice that it’s being done. This process
prevents hackers from re-directing you to fake, phishing or
criminal sites.  While some third party DNS servers do not
currently feature this process, performing such security
validation is a best practice. Any DNS server operators not yet
performing this global security standard wil