I-Quad9 sisisombululo sikawonke-wonke se-DNS esiphinda-phinda sijolise ekukhuseleni abasebenzisi kwi-malware kunye ne-phishing. I-Quad9 iqhutywa yi-Quad9 Foundation, i-Swiss public-benefit, isiseko esingenzi nzuzo ngenjongo yokuphucula ubumfihlo kunye nokhuseleko lwe-intanethi lwabasebenzisi be-Intanethi, ikomkhulu eliseZurich. Siso kuphela isisombululi sikawonke-wonke sehlabathi esisebenza singenzi nzuzo, kuxhamlo loluntu. I-Quad9 iphantsi ngokupheleleyo kumthetho wabucala waseSwitzerland, kwaye urhulumente waseSwitzerland wandisa olo khuseleko lomthetho kubasebenzisi be-Quad9 kwihlabathi liphela, nokuba bangabemi okanye ilizwe ahlala kulo. I-Quad9 ngoku kuphela kwesicombululo sehlabathi esiphinda-phindayo esingekho phantsi komthetho wase-United States, njengoko ezinye ziphantsi koMmandla we-San Francisco Bay kwaye zilawulwa yiSithili soMntla saseKhalifoniya kwiNkundla yoMdibaniso yase-US.