DNSSEC is an extension of the Domain Name System (DNS) that serves to guarantee the authenticity and integrity of data from DNS responses. More about DNSSEC
The graphic below shows the number of DNSSEC-signed domain names on the first of every month since the roll-out of DNSSEC at SWITCH back in 2010. The sharp increase in numbers in recent months can be explained by the fact that, in view of the DNS resilience programme, several registrars have started signing their entire domain name inventory with DNSSEC.
The following graphic shows the percentage of domain names with DNSSEC out of the total number of active domain names (i.e. domain names with registered name servers).