If you’d like to find out a website’s CNAME record, you can either turn to a special software program or simply use a web service for this purpose. With Public DNS, Google provides a separate DNS server that you can use to access the various website DNS records.
On the Public DNS website, you enter the desired domain whose CNAME you would like to check. On the following page, you should change the RR type (by default, this is set to A) to the CNAME record; then you have to click on the resolve button again to receive the result.
Both settings for the EDNS client subnet and DNSSEC can remain unchanged. The former is a mechanism that is supposed to capture the requestor’s location, and in this way deliver more efficient results – currently, however, it is only promoted by Google and OpenDNS. DNSSEC, on the other hand, guarantees the user that the information has not been manipulated by a third party who may have intercepted the communication unnoticed.