Censys, a search engine for internet devices, raises $15.5M Series A

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Internet device search engine Censys is one of the biggest search engines you’ve probably never heard of.

If Google is the search engine for finding information sitting on the web, Censys is the search engine for finding internet devices, like computers, servers, and smart devices, that hosts the data to begin with. By continually mapping the internet looking for connected devices, it’s possible to identify devices that are accessible outside a company’s firewall. The aim is to help companies keep track of which systems can be accessed from the web and know which devices have exploitable security vulnerabilities.

Now, Censys has raised $15.5 million in a Series A fundraise, led by GV and Decibel with participation from Greylock Partners.

David Corcoran, chief executive and co-founder of the Ann Arbor, Mich.-based internet security startup, said the company plans to “aggressively” invest in top security talent and plans to double its headcount from about 50 to 100 in the next year, including expanding its sales, engineering, and leadership teams.

“We’re thrilled to have the support of world-class investors as we keep the momentum building and continue to revolutionize how businesses manage their security posture in an ever-changing environment,” said Corcoran.

The fundraise couldn’t come at a more critical time for the company. Censys is not the only internet device search engine, rivaling Binary Edge and Shodan. But Censys says it has spent two years on bettering its internet mapping technology, helping it see more of the internet than it did before.

The new scan engine, built by the same team that developed and maintains its original open-source ZMap scanner, claims to see 44% more devices on the internet than other security companies. That helps companies see new vulnerable systems as soon as the come online, said Censys’ chief scientist Zakir Durumeric.

Censys is one of a number of growing security companies in the Ann Arbor area, alongside NextHop Technologies, Interlink Networks, and Duo Security, co-founded by Dug Song, who also sits on Censys’ board.

“You can’t protect what you can’t see — but in today’s dynamic IT environment, many organizations struggle to find, much less keep track of, every system and application at risk before the attackers do,” said Song. “Censys empowers defenders with the automated visibility they need to truly understand and to get ahead of these risks, enabling even small security teams to have an outsized impact.”

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