https://www.powerdns.com/powerdns-recursor
PowerDNS Recursor
With PowerDNS Recursor, Internet Service Providers can provide a fast and reliable DNS service
powerdnsrecursor
https://www.vuxml.org/freebsd/f6d6308a-f2ec-11e8-b005-6805ca2fa271.html
VuXML: powerdns-recursor -- Crafted query can cause a denial of service
denial of servicecan causepowerdnsrecursorcrafted