Zrovna u GitHubu vam DNSSEC v nicem nepomuze, kdyz zona github.com
jaksi neni podepsana :D
Domain Name: github.com Tech Organization: GitHub, Inc. Name Server: dns4.p08.nsone.net Name Server: dns1.p08.nsone.net Name Server: dns3.p08.nsone.net Name Server: ns-1707.awsdns-21.co.uk Name Server: ns-421.awsdns-52.com Name Server: dns2.p08.nsone.net Name Server: ns-520.awsdns-01.net Name Server: ns-1283.awsdns-32.org DNSSEC: unsigned