Area 1 was founded by three former N.S.A. analysts, Mr. Darché, Oren Falkowitz and Phil Syme. The three sat side by side at Fort Meade, tracking and, in some cases, penetrating adversaries’ weapons systems for intelligence. A little over two years ago, they decided to start their own company and raised $25.5 million in funding from major venture capitalists and security entrepreneurs in Silicon Valley, including Kleiner Perkins Caulfield & Byers and Cowboy Ventures, and security veterans like Ray Rothrock, the chief executive of RedSeal, and Derek Smith, the chief executive of Shape Security.

Area 1 is a new player in threat intelligence, a nascent subsector of the security business that includes companies like iSight Partners and Recorded Future that track attackers in underground web forums and on social media, gleaning intelligence about them.

Threat intelligence is still more art than science. The jury is still out on whether companies are equipped to use that intelligence to thwart hackers. Area 1 claims that it can head off attacks through the compromised servers it is tracking. It can also use its vantage point to see where attackers are setting up shop on the web and how they plan to target their intended victims.

A handful of Area 1 customers confirmed that its technology had helped head off attackers. One client, a chief information security officer at a large health care provider, said the health care sector had been slammed by digital criminals and governments in recent years. He asked that the company not be named, to avoid becoming a more visible target.

He credited Area 1’s sensors with blocking several attacks on his network, helping his company avoid the fates of the health insurer Anthem, which was breached by Chinese hackers last year, and a growing number of hospitals hit by attacks that have forced them to pay a ransom to get important information back.

Mr. Smith, the chief executive of Shape Security, said Area 1 gave his company warning of three attacks before they happened, providing time to block them. Mr. Smith said he was impressed enough that he made a small investment in Area 1.

“Many of these mom-and-pop shops are ambivalent because the attacks don’t directly impact their business and revenue,” he said. “Meanwhile, they unwittingly operate this attack infrastructure.”