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WHAT IS CENSYS?

Censys is a platform that helps information security practitioners discover,
monitor, and analyze devices that are accessible from the Internet. We regularly
probe every public IP address and popular domain names, curate and enrich the
resulting data, and make it intelligible through an interactive search engine
and API.

Enterprises use Censys to understand their network attack surfaces. CERTs and
security researchers use it to discover new threats and assess their global
impact. Censys was founded by computer scientists at the University of Michigan,
and data we collect has been used in hundreds of scientific papers by
researchers around the world.

For more information, visit Censys.io.


CENSYS SCANNING AND DATA COLLECTION

One way that Censys finds publicly-reachable devices is by using Internet-wide
scanning. We make a small number of harmless connection attempts to every IPv4
address worldwide each day. When we discover that a computer or device is
configured to accept connections, we follow up by completing protocol handshakes
to learn more about the running services.

We never attempt to bypass any technical barriers, exploit security problems, or
otherwise access non-public-facing services, and we follow community best
practices to reduce any burden on remote networks. The only data we receive is
information that is publicly visible to anyone who connects to a particular
address and port.

For technical information about the kinds of data Censys collects, visit our
data definitions page.

Censys scans the Internet from the subnets listed on this page, which you can
allowlist or blocklist if you wish.

We sometimes make follow-up connections from other machines at dynamic IP
addresses, but blocking the addresses above is sufficient to prevent your device
from appearing in our IPv4 dataset.

Censys data is sometimes used by researchers and network administrators to
detect security problems and alert the operators of vulnerable systems. If you
block our scans, you might not receive these important security notifications.


HOW TO REACH US

If you have questions about Censys scanning, please get in touch at
support@censys.io.