ALEXANDRIA, Va., May 26 -- United States Patent no. 12,641,055, issued on May 26, was assigned to Level 3 Communications LLC (Denver).

"Collecting passive DNS traffic to generate a virtual authoritative DNS server" was invented by John R. Woodworth (Amissville, Va.), Dean Ballew (Sterling, Va.) and Mark Dehus (Thornton, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present application describes a system and method for passively collecting DNS traffic data as that data is passed between a recursive DNS resolver and an authoritative DNS server. The information contained in the collected DNS traffic data is used to generate a virtual authoritative DNS server, or a zone associated with the authoritati...